xserver and mesa git update 28-12-2010

1 files changed, 1891 insertions, 1879 deletions

diff --git a/mesalib/src/mesa/program/prog_execute.c b/mesalib/src/mesa/program/prog_execute.c
index 2ae5bc572..4faed2663 100644
--- a/mesalib/src/mesa/program/prog_execute.c
+++ b/mesalib/src/mesa/program/prog_execute.c
@@ -1,1879 +1,1891 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.3
- *
- * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-/**
- * \file prog_execute.c
- * Software interpreter for vertex/fragment programs.
- * \author Brian Paul
- */
-
-/*
- * NOTE: we do everything in single-precision floating point; we don't
- * currently observe the single/half/fixed-precision qualifiers.
- *
- */
-
-
-#include "main/glheader.h"
-#include "main/colormac.h"
-#include "main/macros.h"
-#include "prog_execute.h"
-#include "prog_instruction.h"
-#include "prog_parameter.h"
-#include "prog_print.h"
-#include "prog_noise.h"
-
-
-/* debug predicate */
-#define DEBUG_PROG 0
-
-
-/**
- * Set x to positive or negative infinity.
- */
-#if defined(USE_IEEE) || defined(_WIN32)
-#define SET_POS_INFINITY(x)                  \
-   do {                                      \
-         fi_type fi;                         \
-         fi.i = 0x7F800000;                  \
-         x = fi.f;                           \
-   } while (0)
-#define SET_NEG_INFINITY(x)                  \
-   do {                                      \
-         fi_type fi;                         \
-         fi.i = 0xFF800000;                  \
-         x = fi.f;                           \
-   } while (0)
-#elif defined(VMS)
-#define SET_POS_INFINITY(x)  x = __MAXFLOAT
-#define SET_NEG_INFINITY(x)  x = -__MAXFLOAT
-#else
-#define SET_POS_INFINITY(x)  x = (GLfloat) HUGE_VAL
-#define SET_NEG_INFINITY(x)  x = (GLfloat) -HUGE_VAL
-#endif
-
-#define SET_FLOAT_BITS(x, bits) ((fi_type *) (void *) &(x))->i = bits
-
-
-static const GLfloat ZeroVec[4] = { 0.0F, 0.0F, 0.0F, 0.0F };
-
-
-
-/**
- * Return TRUE for +0 and other positive values, FALSE otherwise.
- * Used for RCC opcode.
- */
-static INLINE GLboolean
-positive(float x)
-{
-   fi_type fi;
-   fi.f = x;
-   if (fi.i & 0x80000000)
-      return GL_FALSE;
-   return GL_TRUE;
-}
-
-
-
-/**
- * Return a pointer to the 4-element float vector specified by the given
- * source register.
- */
-static INLINE const GLfloat *
-get_src_register_pointer(const struct prog_src_register *source,
-                         const struct gl_program_machine *machine)
-{
-   const struct gl_program *prog = machine->CurProgram;
-   GLint reg = source->Index;
-
-   if (source->RelAddr) {
-      /* add address register value to src index/offset */
-      reg += machine->AddressReg[0][0];
-      if (reg < 0) {
-         return ZeroVec;
-      }
-   }
-
-   switch (source->File) {
-   case PROGRAM_TEMPORARY:
-      if (reg >= MAX_PROGRAM_TEMPS)
-         return ZeroVec;
-      return machine->Temporaries[reg];
-
-   case PROGRAM_INPUT:
-      if (prog->Target == GL_VERTEX_PROGRAM_ARB) {
-         if (reg >= VERT_ATTRIB_MAX)
-            return ZeroVec;
-         return machine->VertAttribs[reg];
-      }
-      else {
-         if (reg >= FRAG_ATTRIB_MAX)
-            return ZeroVec;
-         return machine->Attribs[reg][machine->CurElement];
-      }
-
-   case PROGRAM_OUTPUT:
-      if (reg >= MAX_PROGRAM_OUTPUTS)
-         return ZeroVec;
-      return machine->Outputs[reg];
-
-   case PROGRAM_LOCAL_PARAM:
-      if (reg >= MAX_PROGRAM_LOCAL_PARAMS)
-         return ZeroVec;
-      return machine->CurProgram->LocalParams[reg];
-
-   case PROGRAM_ENV_PARAM:
-      if (reg >= MAX_PROGRAM_ENV_PARAMS)
-         return ZeroVec;
-      return machine->EnvParams[reg];
-
-   case PROGRAM_STATE_VAR:
-      /* Fallthrough */
-   case PROGRAM_CONSTANT:
-      /* Fallthrough */
-   case PROGRAM_UNIFORM:
-      /* Fallthrough */
-   case PROGRAM_NAMED_PARAM:
-      if (reg >= (GLint) prog->Parameters->NumParameters)
-         return ZeroVec;
-      return prog->Parameters->ParameterValues[reg];
-
-   default:
-      _mesa_problem(NULL,
-         "Invalid src register file %d in get_src_register_pointer()",
-         source->File);
-      return NULL;
-   }
-}
-
-
-/**
- * Return a pointer to the 4-element float vector specified by the given
- * destination register.
- */
-static INLINE GLfloat *
-get_dst_register_pointer(const struct prog_dst_register *dest,
-                         struct gl_program_machine *machine)
-{
-   static GLfloat dummyReg[4];
-   GLint reg = dest->Index;
-
-   if (dest->RelAddr) {
-      /* add address register value to src index/offset */
-      reg += machine->AddressReg[0][0];
-      if (reg < 0) {
-         return dummyReg;
-      }
-   }
-
-   switch (dest->File) {
-   case PROGRAM_TEMPORARY:
-      if (reg >= MAX_PROGRAM_TEMPS)
-         return dummyReg;
-      return machine->Temporaries[reg];
-
-   case PROGRAM_OUTPUT:
-      if (reg >= MAX_PROGRAM_OUTPUTS)
-         return dummyReg;
-      return machine->Outputs[reg];
-
-   case PROGRAM_WRITE_ONLY:
-      return dummyReg;
-
-   default:
-      _mesa_problem(NULL,
-         "Invalid dest register file %d in get_dst_register_pointer()",
-         dest->File);
-      return NULL;
-   }
-}
-
-
-
-/**
- * Fetch a 4-element float vector from the given source register.
- * Apply swizzling and negating as needed.
- */
-static void
-fetch_vector4(const struct prog_src_register *source,
-              const struct gl_program_machine *machine, GLfloat result[4])
-{
-   const GLfloat *src = get_src_register_pointer(source, machine);
-   ASSERT(src);
-
-   if (source->Swizzle == SWIZZLE_NOOP) {
-      /* no swizzling */
-      COPY_4V(result, src);
-   }
-   else {
-      ASSERT(GET_SWZ(source->Swizzle, 0) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 1) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 2) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 3) <= 3);
-      result[0] = src[GET_SWZ(source->Swizzle, 0)];
-      result[1] = src[GET_SWZ(source->Swizzle, 1)];
-      result[2] = src[GET_SWZ(source->Swizzle, 2)];
-      result[3] = src[GET_SWZ(source->Swizzle, 3)];
-   }
-
-   if (source->Abs) {
-      result[0] = FABSF(result[0]);
-      result[1] = FABSF(result[1]);
-      result[2] = FABSF(result[2]);
-      result[3] = FABSF(result[3]);
-   }
-   if (source->Negate) {
-      ASSERT(source->Negate == NEGATE_XYZW);
-      result[0] = -result[0];
-      result[1] = -result[1];
-      result[2] = -result[2];
-      result[3] = -result[3];
-   }
-
-#ifdef NAN_CHECK
-   assert(!IS_INF_OR_NAN(result[0]));
-   assert(!IS_INF_OR_NAN(result[0]));
-   assert(!IS_INF_OR_NAN(result[0]));
-   assert(!IS_INF_OR_NAN(result[0]));
-#endif
-}
-
-
-/**
- * Fetch a 4-element uint vector from the given source register.
- * Apply swizzling but not negation/abs.
- */
-static void
-fetch_vector4ui(const struct prog_src_register *source,
-                const struct gl_program_machine *machine, GLuint result[4])
-{
-   const GLuint *src = (GLuint *) get_src_register_pointer(source, machine);
-   ASSERT(src);
-
-   if (source->Swizzle == SWIZZLE_NOOP) {
-      /* no swizzling */
-      COPY_4V(result, src);
-   }
-   else {
-      ASSERT(GET_SWZ(source->Swizzle, 0) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 1) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 2) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 3) <= 3);
-      result[0] = src[GET_SWZ(source->Swizzle, 0)];
-      result[1] = src[GET_SWZ(source->Swizzle, 1)];
-      result[2] = src[GET_SWZ(source->Swizzle, 2)];
-      result[3] = src[GET_SWZ(source->Swizzle, 3)];
-   }
-
-   /* Note: no Negate or Abs here */
-}
-
-
-
-/**
- * Fetch the derivative with respect to X or Y for the given register.
- * XXX this currently only works for fragment program input attribs.
- */
-static void
-fetch_vector4_deriv(GLcontext * ctx,
-                    const struct prog_src_register *source,
-                    const struct gl_program_machine *machine,
-                    char xOrY, GLfloat result[4])
-{
-   if (source->File == PROGRAM_INPUT &&
-       source->Index < (GLint) machine->NumDeriv) {
-      const GLint col = machine->CurElement;
-      const GLfloat w = machine->Attribs[FRAG_ATTRIB_WPOS][col][3];
-      const GLfloat invQ = 1.0f / w;
-      GLfloat deriv[4];
-
-      if (xOrY == 'X') {
-         deriv[0] = machine->DerivX[source->Index][0] * invQ;
-         deriv[1] = machine->DerivX[source->Index][1] * invQ;
-         deriv[2] = machine->DerivX[source->Index][2] * invQ;
-         deriv[3] = machine->DerivX[source->Index][3] * invQ;
-      }
-      else {
-         deriv[0] = machine->DerivY[source->Index][0] * invQ;
-         deriv[1] = machine->DerivY[source->Index][1] * invQ;
-         deriv[2] = machine->DerivY[source->Index][2] * invQ;
-         deriv[3] = machine->DerivY[source->Index][3] * invQ;
-      }
-
-      result[0] = deriv[GET_SWZ(source->Swizzle, 0)];
-      result[1] = deriv[GET_SWZ(source->Swizzle, 1)];
-      result[2] = deriv[GET_SWZ(source->Swizzle, 2)];
-      result[3] = deriv[GET_SWZ(source->Swizzle, 3)];
-      
-      if (source->Abs) {
-         result[0] = FABSF(result[0]);
-         result[1] = FABSF(result[1]);
-         result[2] = FABSF(result[2]);
-         result[3] = FABSF(result[3]);
-      }
-      if (source->Negate) {
-         ASSERT(source->Negate == NEGATE_XYZW);
-         result[0] = -result[0];
-         result[1] = -result[1];
-         result[2] = -result[2];
-         result[3] = -result[3];
-      }
-   }
-   else {
-      ASSIGN_4V(result, 0.0, 0.0, 0.0, 0.0);
-   }
-}
-
-
-/**
- * As above, but only return result[0] element.
- */
-static void
-fetch_vector1(const struct prog_src_register *source,
-              const struct gl_program_machine *machine, GLfloat result[4])
-{
-   const GLfloat *src = get_src_register_pointer(source, machine);
-   ASSERT(src);
-
-   result[0] = src[GET_SWZ(source->Swizzle, 0)];
-
-   if (source->Abs) {
-      result[0] = FABSF(result[0]);
-   }
-   if (source->Negate) {
-      result[0] = -result[0];
-   }
-}
-
-
-static GLuint
-fetch_vector1ui(const struct prog_src_register *source,
-                const struct gl_program_machine *machine)
-{
-   const GLuint *src = (GLuint *) get_src_register_pointer(source, machine);
-   return src[GET_SWZ(source->Swizzle, 0)];
-}
-
-
-/**
- * Fetch texel from texture.  Use partial derivatives when possible.
- */
-static INLINE void
-fetch_texel(GLcontext *ctx,
-            const struct gl_program_machine *machine,
-            const struct prog_instruction *inst,
-            const GLfloat texcoord[4], GLfloat lodBias,
-            GLfloat color[4])
-{
-   const GLuint unit = machine->Samplers[inst->TexSrcUnit];
-
-   /* Note: we only have the right derivatives for fragment input attribs.
-    */
-   if (machine->NumDeriv > 0 &&
-       inst->SrcReg[0].File == PROGRAM_INPUT &&
-       inst->SrcReg[0].Index == FRAG_ATTRIB_TEX0 + inst->TexSrcUnit) {
-      /* simple texture fetch for which we should have derivatives */
-      GLuint attr = inst->SrcReg[0].Index;
-      machine->FetchTexelDeriv(ctx, texcoord,
-                               machine->DerivX[attr],
-                               machine->DerivY[attr],
-                               lodBias, unit, color);
-   }
-   else {
-      machine->FetchTexelLod(ctx, texcoord, lodBias, unit, color);
-   }
-}
-
-
-/**
- * Test value against zero and return GT, LT, EQ or UN if NaN.
- */
-static INLINE GLuint
-generate_cc(float value)
-{
-   if (value != value)
-      return COND_UN;           /* NaN */
-   if (value > 0.0F)
-      return COND_GT;
-   if (value < 0.0F)
-      return COND_LT;
-   return COND_EQ;
-}
-
-
-/**
- * Test if the ccMaskRule is satisfied by the given condition code.
- * Used to mask destination writes according to the current condition code.
- */
-static INLINE GLboolean
-test_cc(GLuint condCode, GLuint ccMaskRule)
-{
-   switch (ccMaskRule) {
-   case COND_EQ: return (condCode == COND_EQ);
-   case COND_NE: return (condCode != COND_EQ);
-   case COND_LT: return (condCode == COND_LT);
-   case COND_GE: return (condCode == COND_GT || condCode == COND_EQ);
-   case COND_LE: return (condCode == COND_LT || condCode == COND_EQ);
-   case COND_GT: return (condCode == COND_GT);
-   case COND_TR: return GL_TRUE;
-   case COND_FL: return GL_FALSE;
-   default:      return GL_TRUE;
-   }
-}
-
-
-/**
- * Evaluate the 4 condition codes against a predicate and return GL_TRUE
- * or GL_FALSE to indicate result.
- */
-static INLINE GLboolean
-eval_condition(const struct gl_program_machine *machine,
-               const struct prog_instruction *inst)
-{
-   const GLuint swizzle = inst->DstReg.CondSwizzle;
-   const GLuint condMask = inst->DstReg.CondMask;
-   if (test_cc(machine->CondCodes[GET_SWZ(swizzle, 0)], condMask) ||
-       test_cc(machine->CondCodes[GET_SWZ(swizzle, 1)], condMask) ||
-       test_cc(machine->CondCodes[GET_SWZ(swizzle, 2)], condMask) ||
-       test_cc(machine->CondCodes[GET_SWZ(swizzle, 3)], condMask)) {
-      return GL_TRUE;
-   }
-   else {
-      return GL_FALSE;
-   }
-}
-
-
-
-/**
- * Store 4 floats into a register.  Observe the instructions saturate and
- * set-condition-code flags.
- */
-static void
-store_vector4(const struct prog_instruction *inst,
-              struct gl_program_machine *machine, const GLfloat value[4])
-{
-   const struct prog_dst_register *dstReg = &(inst->DstReg);
-   const GLboolean clamp = inst->SaturateMode == SATURATE_ZERO_ONE;
-   GLuint writeMask = dstReg->WriteMask;
-   GLfloat clampedValue[4];
-   GLfloat *dst = get_dst_register_pointer(dstReg, machine);
-
-#if 0
-   if (value[0] > 1.0e10 ||
-       IS_INF_OR_NAN(value[0]) ||
-       IS_INF_OR_NAN(value[1]) ||
-       IS_INF_OR_NAN(value[2]) || IS_INF_OR_NAN(value[3]))
-      printf("store %g %g %g %g\n", value[0], value[1], value[2], value[3]);
-#endif
-
-   if (clamp) {
-      clampedValue[0] = CLAMP(value[0], 0.0F, 1.0F);
-      clampedValue[1] = CLAMP(value[1], 0.0F, 1.0F);
-      clampedValue[2] = CLAMP(value[2], 0.0F, 1.0F);
-      clampedValue[3] = CLAMP(value[3], 0.0F, 1.0F);
-      value = clampedValue;
-   }
-
-   if (dstReg->CondMask != COND_TR) {
-      /* condition codes may turn off some writes */
-      if (writeMask & WRITEMASK_X) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 0)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_X;
-      }
-      if (writeMask & WRITEMASK_Y) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 1)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_Y;
-      }
-      if (writeMask & WRITEMASK_Z) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 2)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_Z;
-      }
-      if (writeMask & WRITEMASK_W) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 3)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_W;
-      }
-   }
-
-#ifdef NAN_CHECK
-   assert(!IS_INF_OR_NAN(value[0]));
-   assert(!IS_INF_OR_NAN(value[0]));
-   assert(!IS_INF_OR_NAN(value[0]));
-   assert(!IS_INF_OR_NAN(value[0]));
-#endif
-
-   if (writeMask & WRITEMASK_X)
-      dst[0] = value[0];
-   if (writeMask & WRITEMASK_Y)
-      dst[1] = value[1];
-   if (writeMask & WRITEMASK_Z)
-      dst[2] = value[2];
-   if (writeMask & WRITEMASK_W)
-      dst[3] = value[3];
-
-   if (inst->CondUpdate) {
-      if (writeMask & WRITEMASK_X)
-         machine->CondCodes[0] = generate_cc(value[0]);
-      if (writeMask & WRITEMASK_Y)
-         machine->CondCodes[1] = generate_cc(value[1]);
-      if (writeMask & WRITEMASK_Z)
-         machine->CondCodes[2] = generate_cc(value[2]);
-      if (writeMask & WRITEMASK_W)
-         machine->CondCodes[3] = generate_cc(value[3]);
-#if DEBUG_PROG
-      printf("CondCodes=(%s,%s,%s,%s) for:\n",
-             _mesa_condcode_string(machine->CondCodes[0]),
-             _mesa_condcode_string(machine->CondCodes[1]),
-             _mesa_condcode_string(machine->CondCodes[2]),
-             _mesa_condcode_string(machine->CondCodes[3]));
-#endif
-   }
-}
-
-
-/**
- * Store 4 uints into a register.  Observe the set-condition-code flags.
- */
-static void
-store_vector4ui(const struct prog_instruction *inst,
-                struct gl_program_machine *machine, const GLuint value[4])
-{
-   const struct prog_dst_register *dstReg = &(inst->DstReg);
-   GLuint writeMask = dstReg->WriteMask;
-   GLuint *dst = (GLuint *) get_dst_register_pointer(dstReg, machine);
-
-   if (dstReg->CondMask != COND_TR) {
-      /* condition codes may turn off some writes */
-      if (writeMask & WRITEMASK_X) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 0)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_X;
-      }
-      if (writeMask & WRITEMASK_Y) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 1)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_Y;
-      }
-      if (writeMask & WRITEMASK_Z) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 2)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_Z;
-      }
-      if (writeMask & WRITEMASK_W) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 3)],
-                      dstReg->CondMask))
-            writeMask &= ~WRITEMASK_W;
-      }
-   }
-
-   if (writeMask & WRITEMASK_X)
-      dst[0] = value[0];
-   if (writeMask & WRITEMASK_Y)
-      dst[1] = value[1];
-   if (writeMask & WRITEMASK_Z)
-      dst[2] = value[2];
-   if (writeMask & WRITEMASK_W)
-      dst[3] = value[3];
-
-   if (inst->CondUpdate) {
-      if (writeMask & WRITEMASK_X)
-         machine->CondCodes[0] = generate_cc((float)value[0]);
-      if (writeMask & WRITEMASK_Y)
-         machine->CondCodes[1] = generate_cc((float)value[1]);
-      if (writeMask & WRITEMASK_Z)
-         machine->CondCodes[2] = generate_cc((float)value[2]);
-      if (writeMask & WRITEMASK_W)
-         machine->CondCodes[3] = generate_cc((float)value[3]);
-#if DEBUG_PROG
-      printf("CondCodes=(%s,%s,%s,%s) for:\n",
-             _mesa_condcode_string(machine->CondCodes[0]),
-             _mesa_condcode_string(machine->CondCodes[1]),
-             _mesa_condcode_string(machine->CondCodes[2]),
-             _mesa_condcode_string(machine->CondCodes[3]));
-#endif
-   }
-}
-
-
-
-/**
- * Execute the given vertex/fragment program.
- *
- * \param ctx  rendering context
- * \param program  the program to execute
- * \param machine  machine state (must be initialized)
- * \return GL_TRUE if program completed or GL_FALSE if program executed KIL.
- */
-GLboolean
-_mesa_execute_program(GLcontext * ctx,
-                      const struct gl_program *program,
-                      struct gl_program_machine *machine)
-{
-   const GLuint numInst = program->NumInstructions;
-   const GLuint maxExec = 10000;
-   GLuint pc, numExec = 0;
-
-   machine->CurProgram = program;
-
-   if (DEBUG_PROG) {
-      printf("execute program %u --------------------\n", program->Id);
-   }
-
-   if (program->Target == GL_VERTEX_PROGRAM_ARB) {
-      machine->EnvParams = ctx->VertexProgram.Parameters;
-   }
-   else {
-      machine->EnvParams = ctx->FragmentProgram.Parameters;
-   }
-
-   for (pc = 0; pc < numInst; pc++) {
-      const struct prog_instruction *inst = program->Instructions + pc;
-
-      if (DEBUG_PROG) {
-         _mesa_print_instruction(inst);
-      }
-
-      switch (inst->Opcode) {
-      case OPCODE_ABS:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] = FABSF(a[0]);
-            result[1] = FABSF(a[1]);
-            result[2] = FABSF(a[2]);
-            result[3] = FABSF(a[3]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_ADD:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = a[0] + b[0];
-            result[1] = a[1] + b[1];
-            result[2] = a[2] + b[2];
-            result[3] = a[3] + b[3];
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("ADD (%g %g %g %g) = (%g %g %g %g) + (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_AND:     /* bitwise AND */
-         {
-            GLuint a[4], b[4], result[4];
-            fetch_vector4ui(&inst->SrcReg[0], machine, a);
-            fetch_vector4ui(&inst->SrcReg[1], machine, b);
-            result[0] = a[0] & b[0];
-            result[1] = a[1] & b[1];
-            result[2] = a[2] & b[2];
-            result[3] = a[3] & b[3];
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_ARL:
-         {
-            GLfloat t[4];
-            fetch_vector4(&inst->SrcReg[0], machine, t);
-            machine->AddressReg[0][0] = IFLOOR(t[0]);
-            if (DEBUG_PROG) {
-               printf("ARL %d\n", machine->AddressReg[0][0]);
-            }
-         }
-         break;
-      case OPCODE_BGNLOOP:
-         /* no-op */
-         ASSERT(program->Instructions[inst->BranchTarget].Opcode
-                == OPCODE_ENDLOOP);
-         break;
-      case OPCODE_ENDLOOP:
-         /* subtract 1 here since pc is incremented by for(pc) loop */
-         ASSERT(program->Instructions[inst->BranchTarget].Opcode
-                == OPCODE_BGNLOOP);
-         pc = inst->BranchTarget - 1;   /* go to matching BNGLOOP */
-         break;
-      case OPCODE_BGNSUB:      /* begin subroutine */
-         break;
-      case OPCODE_ENDSUB:      /* end subroutine */
-         break;
-      case OPCODE_BRA:         /* branch (conditional) */
-         if (eval_condition(machine, inst)) {
-            /* take branch */
-            /* Subtract 1 here since we'll do pc++ below */
-            pc = inst->BranchTarget - 1;
-         }
-         break;
-      case OPCODE_BRK:         /* break out of loop (conditional) */
-         ASSERT(program->Instructions[inst->BranchTarget].Opcode
-                == OPCODE_ENDLOOP);
-         if (eval_condition(machine, inst)) {
-            /* break out of loop */
-            /* pc++ at end of for-loop will put us after the ENDLOOP inst */
-            pc = inst->BranchTarget;
-         }
-         break;
-      case OPCODE_CONT:        /* continue loop (conditional) */
-         ASSERT(program->Instructions[inst->BranchTarget].Opcode
-                == OPCODE_ENDLOOP);
-         if (eval_condition(machine, inst)) {
-            /* continue at ENDLOOP */
-            /* Subtract 1 here since we'll do pc++ at end of for-loop */
-            pc = inst->BranchTarget - 1;
-         }
-         break;
-      case OPCODE_CAL:         /* Call subroutine (conditional) */
-         if (eval_condition(machine, inst)) {
-            /* call the subroutine */
-            if (machine->StackDepth >= MAX_PROGRAM_CALL_DEPTH) {
-               return GL_TRUE;  /* Per GL_NV_vertex_program2 spec */
-            }
-            machine->CallStack[machine->StackDepth++] = pc + 1; /* next inst */
-            /* Subtract 1 here since we'll do pc++ at end of for-loop */
-            pc = inst->BranchTarget - 1;
-         }
-         break;
-      case OPCODE_CMP:
-         {
-            GLfloat a[4], b[4], c[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            fetch_vector4(&inst->SrcReg[2], machine, c);
-            result[0] = a[0] < 0.0F ? b[0] : c[0];
-            result[1] = a[1] < 0.0F ? b[1] : c[1];
-            result[2] = a[2] < 0.0F ? b[2] : c[2];
-            result[3] = a[3] < 0.0F ? b[3] : c[3];
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("CMP (%g %g %g %g) = (%g %g %g %g) < 0 ? (%g %g %g %g) : (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3],
-                      c[0], c[1], c[2], c[3]);
-            }
-         }
-         break;
-      case OPCODE_COS:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            result[0] = result[1] = result[2] = result[3]
-               = (GLfloat) cos(a[0]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_DDX:         /* Partial derivative with respect to X */
-         {
-            GLfloat result[4];
-            fetch_vector4_deriv(ctx, &inst->SrcReg[0], machine,
-                                'X', result);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_DDY:         /* Partial derivative with respect to Y */
-         {
-            GLfloat result[4];
-            fetch_vector4_deriv(ctx, &inst->SrcReg[0], machine,
-                                'Y', result);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_DP2:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = result[1] = result[2] = result[3] = DOT2(a, b);
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("DP2 %g = (%g %g) . (%g %g)\n",
-                      result[0], a[0], a[1], b[0], b[1]);
-            }
-         }
-         break;
-      case OPCODE_DP2A:
-         {
-            GLfloat a[4], b[4], c, result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            fetch_vector1(&inst->SrcReg[1], machine, &c);
-            result[0] = result[1] = result[2] = result[3] = DOT2(a, b) + c;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("DP2A %g = (%g %g) . (%g %g) + %g\n",
-                      result[0], a[0], a[1], b[0], b[1], c);
-            }
-         }
-         break;
-      case OPCODE_DP3:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = result[1] = result[2] = result[3] = DOT3(a, b);
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("DP3 %g = (%g %g %g) . (%g %g %g)\n",
-                      result[0], a[0], a[1], a[2], b[0], b[1], b[2]);
-            }
-         }
-         break;
-      case OPCODE_DP4:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = result[1] = result[2] = result[3] = DOT4(a, b);
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("DP4 %g = (%g, %g %g %g) . (%g, %g %g %g)\n",
-                      result[0], a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_DPH:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = result[1] = result[2] = result[3] = DOT3(a, b) + b[3];
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_DST:         /* Distance vector */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = 1.0F;
-            result[1] = a[1] * b[1];
-            result[2] = a[2];
-            result[3] = b[3];
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_EXP:
-         {
-            GLfloat t[4], q[4], floor_t0;
-            fetch_vector1(&inst->SrcReg[0], machine, t);
-            floor_t0 = FLOORF(t[0]);
-            if (floor_t0 > FLT_MAX_EXP) {
-               SET_POS_INFINITY(q[0]);
-               SET_POS_INFINITY(q[2]);
-            }
-            else if (floor_t0 < FLT_MIN_EXP) {
-               q[0] = 0.0F;
-               q[2] = 0.0F;
-            }
-            else {
-               q[0] = LDEXPF(1.0, (int) floor_t0);
-               /* Note: GL_NV_vertex_program expects 
-                * result.z = result.x * APPX(result.y)
-                * We do what the ARB extension says.
-                */
-               q[2] = (GLfloat) pow(2.0, t[0]);
-            }
-            q[1] = t[0] - floor_t0;
-            q[3] = 1.0F;
-            store_vector4( inst, machine, q );
-         }
-         break;
-      case OPCODE_EX2:         /* Exponential base 2 */
-         {
-            GLfloat a[4], result[4], val;
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            val = (GLfloat) pow(2.0, a[0]);
-            /*
-            if (IS_INF_OR_NAN(val))
-               val = 1.0e10;
-            */
-            result[0] = result[1] = result[2] = result[3] = val;
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_FLR:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] = FLOORF(a[0]);
-            result[1] = FLOORF(a[1]);
-            result[2] = FLOORF(a[2]);
-            result[3] = FLOORF(a[3]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_FRC:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] = a[0] - FLOORF(a[0]);
-            result[1] = a[1] - FLOORF(a[1]);
-            result[2] = a[2] - FLOORF(a[2]);
-            result[3] = a[3] - FLOORF(a[3]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_IF:
-         {
-            GLboolean cond;
-            ASSERT(program->Instructions[inst->BranchTarget].Opcode
-                   == OPCODE_ELSE ||
-                   program->Instructions[inst->BranchTarget].Opcode
-                   == OPCODE_ENDIF);
-            /* eval condition */
-            if (inst->SrcReg[0].File != PROGRAM_UNDEFINED) {
-               GLfloat a[4];
-               fetch_vector1(&inst->SrcReg[0], machine, a);
-               cond = (a[0] != 0.0);
-            }
-            else {
-               cond = eval_condition(machine, inst);
-            }
-            if (DEBUG_PROG) {
-               printf("IF: %d\n", cond);
-            }
-            /* do if/else */
-            if (cond) {
-               /* do if-clause (just continue execution) */
-            }
-            else {
-               /* go to the instruction after ELSE or ENDIF */
-               assert(inst->BranchTarget >= 0);
-               pc = inst->BranchTarget;
-            }
-         }
-         break;
-      case OPCODE_ELSE:
-         /* goto ENDIF */
-         ASSERT(program->Instructions[inst->BranchTarget].Opcode
-                == OPCODE_ENDIF);
-         assert(inst->BranchTarget >= 0);
-         pc = inst->BranchTarget;
-         break;
-      case OPCODE_ENDIF:
-         /* nothing */
-         break;
-      case OPCODE_KIL_NV:      /* NV_f_p only (conditional) */
-         if (eval_condition(machine, inst)) {
-            return GL_FALSE;
-         }
-         break;
-      case OPCODE_KIL:         /* ARB_f_p only */
-         {
-            GLfloat a[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            if (DEBUG_PROG) {
-               printf("KIL if (%g %g %g %g) <= 0.0\n",
-                      a[0], a[1], a[2], a[3]);
-            }
-
-            if (a[0] < 0.0F || a[1] < 0.0F || a[2] < 0.0F || a[3] < 0.0F) {
-               return GL_FALSE;
-            }
-         }
-         break;
-      case OPCODE_LG2:         /* log base 2 */
-         {
-            GLfloat a[4], result[4], val;
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-	    /* The fast LOG2 macro doesn't meet the precision requirements.
-	     */
-            if (a[0] == 0.0F) {
-               val = -FLT_MAX;
-            }
-            else {
-               val = (float)(log(a[0]) * 1.442695F);
-            }
-            result[0] = result[1] = result[2] = result[3] = val;
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_LIT:
-         {
-            const GLfloat epsilon = 1.0F / 256.0F;      /* from NV VP spec */
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            a[0] = MAX2(a[0], 0.0F);
-            a[1] = MAX2(a[1], 0.0F);
-            /* XXX ARB version clamps a[3], NV version doesn't */
-            a[3] = CLAMP(a[3], -(128.0F - epsilon), (128.0F - epsilon));
-            result[0] = 1.0F;
-            result[1] = a[0];
-            /* XXX we could probably just use pow() here */
-            if (a[0] > 0.0F) {
-               if (a[1] == 0.0 && a[3] == 0.0)
-                  result[2] = 1.0F;
-               else
-                  result[2] = (GLfloat) pow(a[1], a[3]);
-            }
-            else {
-               result[2] = 0.0F;
-            }
-            result[3] = 1.0F;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("LIT (%g %g %g %g) : (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3]);
-            }
-         }
-         break;
-      case OPCODE_LOG:
-         {
-            GLfloat t[4], q[4], abs_t0;
-            fetch_vector1(&inst->SrcReg[0], machine, t);
-            abs_t0 = FABSF(t[0]);
-            if (abs_t0 != 0.0F) {
-               /* Since we really can't handle infinite values on VMS
-                * like other OSes we'll use __MAXFLOAT to represent
-                * infinity.  This may need some tweaking.
-                */
-#ifdef VMS
-               if (abs_t0 == __MAXFLOAT)
-#else
-               if (IS_INF_OR_NAN(abs_t0))
-#endif
-               {
-                  SET_POS_INFINITY(q[0]);
-                  q[1] = 1.0F;
-                  SET_POS_INFINITY(q[2]);
-               }
-               else {
-                  int exponent;
-                  GLfloat mantissa = FREXPF(t[0], &exponent);
-                  q[0] = (GLfloat) (exponent - 1);
-                  q[1] = (GLfloat) (2.0 * mantissa); /* map [.5, 1) -> [1, 2) */
-
-		  /* The fast LOG2 macro doesn't meet the precision
-		   * requirements.
-		   */
-                  q[2] = (float)(log(t[0]) * 1.442695F);
-               }
-            }
-            else {
-               SET_NEG_INFINITY(q[0]);
-               q[1] = 1.0F;
-               SET_NEG_INFINITY(q[2]);
-            }
-            q[3] = 1.0;
-            store_vector4(inst, machine, q);
-         }
-         break;
-      case OPCODE_LRP:
-         {
-            GLfloat a[4], b[4], c[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            fetch_vector4(&inst->SrcReg[2], machine, c);
-            result[0] = a[0] * b[0] + (1.0F - a[0]) * c[0];
-            result[1] = a[1] * b[1] + (1.0F - a[1]) * c[1];
-            result[2] = a[2] * b[2] + (1.0F - a[2]) * c[2];
-            result[3] = a[3] * b[3] + (1.0F - a[3]) * c[3];
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("LRP (%g %g %g %g) = (%g %g %g %g), "
-                      "(%g %g %g %g), (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3], c[0], c[1], c[2], c[3]);
-            }
-         }
-         break;
-      case OPCODE_MAD:
-         {
-            GLfloat a[4], b[4], c[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            fetch_vector4(&inst->SrcReg[2], machine, c);
-            result[0] = a[0] * b[0] + c[0];
-            result[1] = a[1] * b[1] + c[1];
-            result[2] = a[2] * b[2] + c[2];
-            result[3] = a[3] * b[3] + c[3];
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("MAD (%g %g %g %g) = (%g %g %g %g) * "
-                      "(%g %g %g %g) + (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3], c[0], c[1], c[2], c[3]);
-            }
-         }
-         break;
-      case OPCODE_MAX:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = MAX2(a[0], b[0]);
-            result[1] = MAX2(a[1], b[1]);
-            result[2] = MAX2(a[2], b[2]);
-            result[3] = MAX2(a[3], b[3]);
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("MAX (%g %g %g %g) = (%g %g %g %g), (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_MIN:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = MIN2(a[0], b[0]);
-            result[1] = MIN2(a[1], b[1]);
-            result[2] = MIN2(a[2], b[2]);
-            result[3] = MIN2(a[3], b[3]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_MOV:
-         {
-            GLfloat result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, result);
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("MOV (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3]);
-            }
-         }
-         break;
-      case OPCODE_MUL:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = a[0] * b[0];
-            result[1] = a[1] * b[1];
-            result[2] = a[2] * b[2];
-            result[3] = a[3] * b[3];
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("MUL (%g %g %g %g) = (%g %g %g %g) * (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_NOISE1:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            result[0] =
-               result[1] =
-               result[2] =
-               result[3] = _mesa_noise1(a[0]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_NOISE2:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] =
-               result[1] =
-               result[2] = result[3] = _mesa_noise2(a[0], a[1]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_NOISE3:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] =
-               result[1] =
-               result[2] =
-               result[3] = _mesa_noise3(a[0], a[1], a[2]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_NOISE4:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] =
-               result[1] =
-               result[2] =
-               result[3] = _mesa_noise4(a[0], a[1], a[2], a[3]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_NOP:
-         break;
-      case OPCODE_NOT:         /* bitwise NOT */
-         {
-            GLuint a[4], result[4];
-            fetch_vector4ui(&inst->SrcReg[0], machine, a);
-            result[0] = ~a[0];
-            result[1] = ~a[1];
-            result[2] = ~a[2];
-            result[3] = ~a[3];
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_NRM3:        /* 3-component normalization */
-         {
-            GLfloat a[4], result[4];
-            GLfloat tmp;
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            tmp = a[0] * a[0] + a[1] * a[1] + a[2] * a[2];
-            if (tmp != 0.0F)
-               tmp = INV_SQRTF(tmp);
-            result[0] = tmp * a[0];
-            result[1] = tmp * a[1];
-            result[2] = tmp * a[2];
-            result[3] = 0.0;  /* undefined, but prevent valgrind warnings */
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_NRM4:        /* 4-component normalization */
-         {
-            GLfloat a[4], result[4];
-            GLfloat tmp;
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            tmp = a[0] * a[0] + a[1] * a[1] + a[2] * a[2] + a[3] * a[3];
-            if (tmp != 0.0F)
-               tmp = INV_SQRTF(tmp);
-            result[0] = tmp * a[0];
-            result[1] = tmp * a[1];
-            result[2] = tmp * a[2];
-            result[3] = tmp * a[3];
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_OR:          /* bitwise OR */
-         {
-            GLuint a[4], b[4], result[4];
-            fetch_vector4ui(&inst->SrcReg[0], machine, a);
-            fetch_vector4ui(&inst->SrcReg[1], machine, b);
-            result[0] = a[0] | b[0];
-            result[1] = a[1] | b[1];
-            result[2] = a[2] | b[2];
-            result[3] = a[3] | b[3];
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_PK2H:        /* pack two 16-bit floats in one 32-bit float */
-         {
-            GLfloat a[4];
-            GLuint result[4];
-            GLhalfNV hx, hy;
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            hx = _mesa_float_to_half(a[0]);
-            hy = _mesa_float_to_half(a[1]);
-            result[0] =
-            result[1] =
-            result[2] =
-            result[3] = hx | (hy << 16);
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_PK2US:       /* pack two GLushorts into one 32-bit float */
-         {
-            GLfloat a[4];
-            GLuint result[4], usx, usy;
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            a[0] = CLAMP(a[0], 0.0F, 1.0F);
-            a[1] = CLAMP(a[1], 0.0F, 1.0F);
-            usx = IROUND(a[0] * 65535.0F);
-            usy = IROUND(a[1] * 65535.0F);
-            result[0] =
-            result[1] =
-            result[2] =
-            result[3] = usx | (usy << 16);
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_PK4B:        /* pack four GLbytes into one 32-bit float */
-         {
-            GLfloat a[4];
-            GLuint result[4], ubx, uby, ubz, ubw;
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            a[0] = CLAMP(a[0], -128.0F / 127.0F, 1.0F);
-            a[1] = CLAMP(a[1], -128.0F / 127.0F, 1.0F);
-            a[2] = CLAMP(a[2], -128.0F / 127.0F, 1.0F);
-            a[3] = CLAMP(a[3], -128.0F / 127.0F, 1.0F);
-            ubx = IROUND(127.0F * a[0] + 128.0F);
-            uby = IROUND(127.0F * a[1] + 128.0F);
-            ubz = IROUND(127.0F * a[2] + 128.0F);
-            ubw = IROUND(127.0F * a[3] + 128.0F);
-            result[0] =
-            result[1] =
-            result[2] =
-            result[3] = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_PK4UB:       /* pack four GLubytes into one 32-bit float */
-         {
-            GLfloat a[4];
-            GLuint result[4], ubx, uby, ubz, ubw;
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            a[0] = CLAMP(a[0], 0.0F, 1.0F);
-            a[1] = CLAMP(a[1], 0.0F, 1.0F);
-            a[2] = CLAMP(a[2], 0.0F, 1.0F);
-            a[3] = CLAMP(a[3], 0.0F, 1.0F);
-            ubx = IROUND(255.0F * a[0]);
-            uby = IROUND(255.0F * a[1]);
-            ubz = IROUND(255.0F * a[2]);
-            ubw = IROUND(255.0F * a[3]);
-            result[0] =
-            result[1] =
-            result[2] =
-            result[3] = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_POW:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            fetch_vector1(&inst->SrcReg[1], machine, b);
-            result[0] = result[1] = result[2] = result[3]
-               = (GLfloat) pow(a[0], b[0]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_RCC:  /* clamped riciprocal */
-         {
-            const float largest = 1.884467e+19, smallest = 5.42101e-20;
-            GLfloat a[4], r, result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            if (DEBUG_PROG) {
-               if (a[0] == 0)
-                  printf("RCC(0)\n");
-               else if (IS_INF_OR_NAN(a[0]))
-                  printf("RCC(inf)\n");
-            }
-            if (a[0] == 1.0F) {
-               r = 1.0F;
-            }
-            else {
-               r = 1.0F / a[0];
-            }
-            if (positive(r)) {
-               if (r > largest) {
-                  r = largest;
-               }
-               else if (r < smallest) {
-                  r = smallest;
-               }
-            }
-            else {
-               if (r < -largest) {
-                  r = -largest;
-               }
-               else if (r > -smallest) {
-                  r = -smallest;
-               }
-            }
-            result[0] = result[1] = result[2] = result[3] = r;
-            store_vector4(inst, machine, result);
-         }
-         break;
-
-      case OPCODE_RCP:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            if (DEBUG_PROG) {
-               if (a[0] == 0)
-                  printf("RCP(0)\n");
-               else if (IS_INF_OR_NAN(a[0]))
-                  printf("RCP(inf)\n");
-            }
-            result[0] = result[1] = result[2] = result[3] = 1.0F / a[0];
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_RET:         /* return from subroutine (conditional) */
-         if (eval_condition(machine, inst)) {
-            if (machine->StackDepth == 0) {
-               return GL_TRUE;  /* Per GL_NV_vertex_program2 spec */
-            }
-            /* subtract one because of pc++ in the for loop */
-            pc = machine->CallStack[--machine->StackDepth] - 1;
-         }
-         break;
-      case OPCODE_RFL:         /* reflection vector */
-         {
-            GLfloat axis[4], dir[4], result[4], tmpX, tmpW;
-            fetch_vector4(&inst->SrcReg[0], machine, axis);
-            fetch_vector4(&inst->SrcReg[1], machine, dir);
-            tmpW = DOT3(axis, axis);
-            tmpX = (2.0F * DOT3(axis, dir)) / tmpW;
-            result[0] = tmpX * axis[0] - dir[0];
-            result[1] = tmpX * axis[1] - dir[1];
-            result[2] = tmpX * axis[2] - dir[2];
-            /* result[3] is never written! XXX enforce in parser! */
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_RSQ:         /* 1 / sqrt() */
-         {
-            GLfloat a[4], result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            a[0] = FABSF(a[0]);
-            result[0] = result[1] = result[2] = result[3] = INV_SQRTF(a[0]);
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("RSQ %g = 1/sqrt(|%g|)\n", result[0], a[0]);
-            }
-         }
-         break;
-      case OPCODE_SCS:         /* sine and cos */
-         {
-            GLfloat a[4], result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            result[0] = (GLfloat) cos(a[0]);
-            result[1] = (GLfloat) sin(a[0]);
-            result[2] = 0.0;    /* undefined! */
-            result[3] = 0.0;    /* undefined! */
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_SEQ:         /* set on equal */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = (a[0] == b[0]) ? 1.0F : 0.0F;
-            result[1] = (a[1] == b[1]) ? 1.0F : 0.0F;
-            result[2] = (a[2] == b[2]) ? 1.0F : 0.0F;
-            result[3] = (a[3] == b[3]) ? 1.0F : 0.0F;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("SEQ (%g %g %g %g) = (%g %g %g %g) == (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_SFL:         /* set false, operands ignored */
-         {
-            static const GLfloat result[4] = { 0.0F, 0.0F, 0.0F, 0.0F };
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_SGE:         /* set on greater or equal */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = (a[0] >= b[0]) ? 1.0F : 0.0F;
-            result[1] = (a[1] >= b[1]) ? 1.0F : 0.0F;
-            result[2] = (a[2] >= b[2]) ? 1.0F : 0.0F;
-            result[3] = (a[3] >= b[3]) ? 1.0F : 0.0F;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("SGE (%g %g %g %g) = (%g %g %g %g) >= (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_SGT:         /* set on greater */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = (a[0] > b[0]) ? 1.0F : 0.0F;
-            result[1] = (a[1] > b[1]) ? 1.0F : 0.0F;
-            result[2] = (a[2] > b[2]) ? 1.0F : 0.0F;
-            result[3] = (a[3] > b[3]) ? 1.0F : 0.0F;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("SGT (%g %g %g %g) = (%g %g %g %g) > (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_SIN:
-         {
-            GLfloat a[4], result[4];
-            fetch_vector1(&inst->SrcReg[0], machine, a);
-            result[0] = result[1] = result[2] = result[3]
-               = (GLfloat) sin(a[0]);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_SLE:         /* set on less or equal */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = (a[0] <= b[0]) ? 1.0F : 0.0F;
-            result[1] = (a[1] <= b[1]) ? 1.0F : 0.0F;
-            result[2] = (a[2] <= b[2]) ? 1.0F : 0.0F;
-            result[3] = (a[3] <= b[3]) ? 1.0F : 0.0F;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("SLE (%g %g %g %g) = (%g %g %g %g) <= (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_SLT:         /* set on less */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = (a[0] < b[0]) ? 1.0F : 0.0F;
-            result[1] = (a[1] < b[1]) ? 1.0F : 0.0F;
-            result[2] = (a[2] < b[2]) ? 1.0F : 0.0F;
-            result[3] = (a[3] < b[3]) ? 1.0F : 0.0F;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("SLT (%g %g %g %g) = (%g %g %g %g) < (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_SNE:         /* set on not equal */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = (a[0] != b[0]) ? 1.0F : 0.0F;
-            result[1] = (a[1] != b[1]) ? 1.0F : 0.0F;
-            result[2] = (a[2] != b[2]) ? 1.0F : 0.0F;
-            result[3] = (a[3] != b[3]) ? 1.0F : 0.0F;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("SNE (%g %g %g %g) = (%g %g %g %g) != (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3],
-                      b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_SSG:         /* set sign (-1, 0 or +1) */
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] = (GLfloat) ((a[0] > 0.0F) - (a[0] < 0.0F));
-            result[1] = (GLfloat) ((a[1] > 0.0F) - (a[1] < 0.0F));
-            result[2] = (GLfloat) ((a[2] > 0.0F) - (a[2] < 0.0F));
-            result[3] = (GLfloat) ((a[3] > 0.0F) - (a[3] < 0.0F));
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_STR:         /* set true, operands ignored */
-         {
-            static const GLfloat result[4] = { 1.0F, 1.0F, 1.0F, 1.0F };
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_SUB:
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = a[0] - b[0];
-            result[1] = a[1] - b[1];
-            result[2] = a[2] - b[2];
-            result[3] = a[3] - b[3];
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("SUB (%g %g %g %g) = (%g %g %g %g) - (%g %g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);
-            }
-         }
-         break;
-      case OPCODE_SWZ:         /* extended swizzle */
-         {
-            const struct prog_src_register *source = &inst->SrcReg[0];
-            const GLfloat *src = get_src_register_pointer(source, machine);
-            GLfloat result[4];
-            GLuint i;
-            for (i = 0; i < 4; i++) {
-               const GLuint swz = GET_SWZ(source->Swizzle, i);
-               if (swz == SWIZZLE_ZERO)
-                  result[i] = 0.0;
-               else if (swz == SWIZZLE_ONE)
-                  result[i] = 1.0;
-               else {
-                  ASSERT(swz >= 0);
-                  ASSERT(swz <= 3);
-                  result[i] = src[swz];
-               }
-               if (source->Negate & (1 << i))
-                  result[i] = -result[i];
-            }
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_TEX:         /* Both ARB and NV frag prog */
-         /* Simple texel lookup */
-         {
-            GLfloat texcoord[4], color[4];
-            fetch_vector4(&inst->SrcReg[0], machine, texcoord);
-
-            fetch_texel(ctx, machine, inst, texcoord, 0.0, color);
-
-            if (DEBUG_PROG) {
-               printf("TEX (%g, %g, %g, %g) = texture[%d][%g, %g, %g, %g]\n",
-                      color[0], color[1], color[2], color[3],
-                      inst->TexSrcUnit,
-                      texcoord[0], texcoord[1], texcoord[2], texcoord[3]);
-            }
-            store_vector4(inst, machine, color);
-         }
-         break;
-      case OPCODE_TXB:         /* GL_ARB_fragment_program only */
-         /* Texel lookup with LOD bias */
-         {
-            GLfloat texcoord[4], color[4], lodBias;
-
-            fetch_vector4(&inst->SrcReg[0], machine, texcoord);
-
-            /* texcoord[3] is the bias to add to lambda */
-            lodBias = texcoord[3];
-
-            fetch_texel(ctx, machine, inst, texcoord, lodBias, color);
-
-            store_vector4(inst, machine, color);
-         }
-         break;
-      case OPCODE_TXD:         /* GL_NV_fragment_program only */
-         /* Texture lookup w/ partial derivatives for LOD */
-         {
-            GLfloat texcoord[4], dtdx[4], dtdy[4], color[4];
-            fetch_vector4(&inst->SrcReg[0], machine, texcoord);
-            fetch_vector4(&inst->SrcReg[1], machine, dtdx);
-            fetch_vector4(&inst->SrcReg[2], machine, dtdy);
-            machine->FetchTexelDeriv(ctx, texcoord, dtdx, dtdy,
-                                     0.0, /* lodBias */
-                                     inst->TexSrcUnit, color);
-            store_vector4(inst, machine, color);
-         }
-         break;
-      case OPCODE_TXL:
-         /* Texel lookup with explicit LOD */
-         {
-            GLfloat texcoord[4], color[4], lod;
-
-            fetch_vector4(&inst->SrcReg[0], machine, texcoord);
-
-            /* texcoord[3] is the LOD */
-            lod = texcoord[3];
-
-	    machine->FetchTexelLod(ctx, texcoord, lod,
-				   machine->Samplers[inst->TexSrcUnit], color);
-
-            store_vector4(inst, machine, color);
-         }
-         break;
-      case OPCODE_TXP:         /* GL_ARB_fragment_program only */
-         /* Texture lookup w/ projective divide */
-         {
-            GLfloat texcoord[4], color[4];
-
-            fetch_vector4(&inst->SrcReg[0], machine, texcoord);
-            /* Not so sure about this test - if texcoord[3] is
-             * zero, we'd probably be fine except for an ASSERT in
-             * IROUND_POS() which gets triggered by the inf values created.
-             */
-            if (texcoord[3] != 0.0) {
-               texcoord[0] /= texcoord[3];
-               texcoord[1] /= texcoord[3];
-               texcoord[2] /= texcoord[3];
-            }
-
-            fetch_texel(ctx, machine, inst, texcoord, 0.0, color);
-
-            store_vector4(inst, machine, color);
-         }
-         break;
-      case OPCODE_TXP_NV:      /* GL_NV_fragment_program only */
-         /* Texture lookup w/ projective divide, as above, but do not
-          * do the divide by w if sampling from a cube map.
-          */
-         {
-            GLfloat texcoord[4], color[4];
-
-            fetch_vector4(&inst->SrcReg[0], machine, texcoord);
-            if (inst->TexSrcTarget != TEXTURE_CUBE_INDEX &&
-                texcoord[3] != 0.0) {
-               texcoord[0] /= texcoord[3];
-               texcoord[1] /= texcoord[3];
-               texcoord[2] /= texcoord[3];
-            }
-
-            fetch_texel(ctx, machine, inst, texcoord, 0.0, color);
-
-            store_vector4(inst, machine, color);
-         }
-         break;
-      case OPCODE_TRUNC:       /* truncate toward zero */
-         {
-            GLfloat a[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            result[0] = (GLfloat) (GLint) a[0];
-            result[1] = (GLfloat) (GLint) a[1];
-            result[2] = (GLfloat) (GLint) a[2];
-            result[3] = (GLfloat) (GLint) a[3];
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_UP2H:        /* unpack two 16-bit floats */
-         {
-            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);
-            GLfloat result[4];
-            GLushort hx, hy;
-            hx = raw & 0xffff;
-            hy = raw >> 16;
-            result[0] = result[2] = _mesa_half_to_float(hx);
-            result[1] = result[3] = _mesa_half_to_float(hy);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_UP2US:       /* unpack two GLushorts */
-         {
-            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);
-            GLfloat result[4];
-            GLushort usx, usy;
-            usx = raw & 0xffff;
-            usy = raw >> 16;
-            result[0] = result[2] = usx * (1.0f / 65535.0f);
-            result[1] = result[3] = usy * (1.0f / 65535.0f);
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_UP4B:        /* unpack four GLbytes */
-         {
-            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);
-            GLfloat result[4];
-            result[0] = (((raw >> 0) & 0xff) - 128) / 127.0F;
-            result[1] = (((raw >> 8) & 0xff) - 128) / 127.0F;
-            result[2] = (((raw >> 16) & 0xff) - 128) / 127.0F;
-            result[3] = (((raw >> 24) & 0xff) - 128) / 127.0F;
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_UP4UB:       /* unpack four GLubytes */
-         {
-            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);
-            GLfloat result[4];
-            result[0] = ((raw >> 0) & 0xff) / 255.0F;
-            result[1] = ((raw >> 8) & 0xff) / 255.0F;
-            result[2] = ((raw >> 16) & 0xff) / 255.0F;
-            result[3] = ((raw >> 24) & 0xff) / 255.0F;
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_XOR:         /* bitwise XOR */
-         {
-            GLuint a[4], b[4], result[4];
-            fetch_vector4ui(&inst->SrcReg[0], machine, a);
-            fetch_vector4ui(&inst->SrcReg[1], machine, b);
-            result[0] = a[0] ^ b[0];
-            result[1] = a[1] ^ b[1];
-            result[2] = a[2] ^ b[2];
-            result[3] = a[3] ^ b[3];
-            store_vector4ui(inst, machine, result);
-         }
-         break;
-      case OPCODE_XPD:         /* cross product */
-         {
-            GLfloat a[4], b[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            result[0] = a[1] * b[2] - a[2] * b[1];
-            result[1] = a[2] * b[0] - a[0] * b[2];
-            result[2] = a[0] * b[1] - a[1] * b[0];
-            result[3] = 1.0;
-            store_vector4(inst, machine, result);
-            if (DEBUG_PROG) {
-               printf("XPD (%g %g %g %g) = (%g %g %g) X (%g %g %g)\n",
-                      result[0], result[1], result[2], result[3],
-                      a[0], a[1], a[2], b[0], b[1], b[2]);
-            }
-         }
-         break;
-      case OPCODE_X2D:         /* 2-D matrix transform */
-         {
-            GLfloat a[4], b[4], c[4], result[4];
-            fetch_vector4(&inst->SrcReg[0], machine, a);
-            fetch_vector4(&inst->SrcReg[1], machine, b);
-            fetch_vector4(&inst->SrcReg[2], machine, c);
-            result[0] = a[0] + b[0] * c[0] + b[1] * c[1];
-            result[1] = a[1] + b[0] * c[2] + b[1] * c[3];
-            result[2] = a[2] + b[0] * c[0] + b[1] * c[1];
-            result[3] = a[3] + b[0] * c[2] + b[1] * c[3];
-            store_vector4(inst, machine, result);
-         }
-         break;
-      case OPCODE_PRINT:
-         {
-            if (inst->SrcReg[0].File != PROGRAM_UNDEFINED) {
-               GLfloat a[4];
-               fetch_vector4(&inst->SrcReg[0], machine, a);
-               printf("%s%g, %g, %g, %g\n", (const char *) inst->Data,
-                            a[0], a[1], a[2], a[3]);
-            }
-            else {
-               printf("%s\n", (const char *) inst->Data);
-            }
-         }
-         break;
-      case OPCODE_END:
-         return GL_TRUE;
-      default:
-         _mesa_problem(ctx, "Bad opcode %d in _mesa_execute_program",
-                       inst->Opcode);
-         return GL_TRUE;        /* return value doesn't matter */
-      }
-
-      numExec++;
-      if (numExec > maxExec) {
-	 static GLboolean reported = GL_FALSE;
-	 if (!reported) {
-	    _mesa_problem(ctx, "Infinite loop detected in fragment program");
-	    reported = GL_TRUE;
-	 }
-         return GL_TRUE;
-      }
-
-   } /* for pc */
-
-   return GL_TRUE;
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  7.3

+ *

+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.

+ *

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the "Software"),

+ * to deal in the Software without restriction, including without limitation

+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,

+ * and/or sell copies of the Software, and to permit persons to whom the

+ * Software is furnished to do so, subject to the following conditions:

+ *

+ * The above copyright notice and this permission notice shall be included

+ * in all copies or substantial portions of the Software.

+ *

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+ */

+

+/**

+ * \file prog_execute.c

+ * Software interpreter for vertex/fragment programs.

+ * \author Brian Paul

+ */

+

+/*

+ * NOTE: we do everything in single-precision floating point; we don't

+ * currently observe the single/half/fixed-precision qualifiers.

+ *

+ */

+

+

+#include "main/glheader.h"

+#include "main/colormac.h"

+#include "main/macros.h"

+#include "prog_execute.h"

+#include "prog_instruction.h"

+#include "prog_parameter.h"

+#include "prog_print.h"

+#include "prog_noise.h"

+

+

+/* debug predicate */

+#define DEBUG_PROG 0

+

+

+/**

+ * Set x to positive or negative infinity.

+ */

+#if defined(USE_IEEE) || defined(_WIN32)

+#define SET_POS_INFINITY(x)                  \

+   do {                                      \

+         fi_type fi;                         \

+         fi.i = 0x7F800000;                  \

+         x = fi.f;                           \

+   } while (0)

+#define SET_NEG_INFINITY(x)                  \

+   do {                                      \

+         fi_type fi;                         \

+         fi.i = 0xFF800000;                  \

+         x = fi.f;                           \

+   } while (0)

+#elif defined(VMS)

+#define SET_POS_INFINITY(x)  x = __MAXFLOAT

+#define SET_NEG_INFINITY(x)  x = -__MAXFLOAT

+#else

+#define SET_POS_INFINITY(x)  x = (GLfloat) HUGE_VAL

+#define SET_NEG_INFINITY(x)  x = (GLfloat) -HUGE_VAL

+#endif

+

+#define SET_FLOAT_BITS(x, bits) ((fi_type *) (void *) &(x))->i = bits

+

+

+static const GLfloat ZeroVec[4] = { 0.0F, 0.0F, 0.0F, 0.0F };

+

+

+

+/**

+ * Return TRUE for +0 and other positive values, FALSE otherwise.

+ * Used for RCC opcode.

+ */

+static INLINE GLboolean

+positive(float x)

+{

+   fi_type fi;

+   fi.f = x;

+   if (fi.i & 0x80000000)

+      return GL_FALSE;

+   return GL_TRUE;

+}

+

+

+

+/**

+ * Return a pointer to the 4-element float vector specified by the given

+ * source register.

+ */

+static INLINE const GLfloat *

+get_src_register_pointer(const struct prog_src_register *source,

+                         const struct gl_program_machine *machine)

+{

+   const struct gl_program *prog = machine->CurProgram;

+   GLint reg = source->Index;

+

+   if (source->RelAddr) {

+      /* add address register value to src index/offset */

+      reg += machine->AddressReg[0][0];

+      if (reg < 0) {

+         return ZeroVec;

+      }

+   }

+

+   switch (source->File) {

+   case PROGRAM_TEMPORARY:

+      if (reg >= MAX_PROGRAM_TEMPS)

+         return ZeroVec;

+      return machine->Temporaries[reg];

+

+   case PROGRAM_INPUT:

+      if (prog->Target == GL_VERTEX_PROGRAM_ARB) {

+         if (reg >= VERT_ATTRIB_MAX)

+            return ZeroVec;

+         return machine->VertAttribs[reg];

+      }

+      else {

+         if (reg >= FRAG_ATTRIB_MAX)

+            return ZeroVec;

+         return machine->Attribs[reg][machine->CurElement];

+      }

+

+   case PROGRAM_OUTPUT:

+      if (reg >= MAX_PROGRAM_OUTPUTS)

+         return ZeroVec;

+      return machine->Outputs[reg];

+

+   case PROGRAM_LOCAL_PARAM:

+      if (reg >= MAX_PROGRAM_LOCAL_PARAMS)

+         return ZeroVec;

+      return machine->CurProgram->LocalParams[reg];

+

+   case PROGRAM_ENV_PARAM:

+      if (reg >= MAX_PROGRAM_ENV_PARAMS)

+         return ZeroVec;

+      return machine->EnvParams[reg];

+

+   case PROGRAM_STATE_VAR:

+      /* Fallthrough */

+   case PROGRAM_CONSTANT:

+      /* Fallthrough */

+   case PROGRAM_UNIFORM:

+      /* Fallthrough */

+   case PROGRAM_NAMED_PARAM:

+      if (reg >= (GLint) prog->Parameters->NumParameters)

+         return ZeroVec;

+      return prog->Parameters->ParameterValues[reg];

+

+   default:

+      _mesa_problem(NULL,

+         "Invalid src register file %d in get_src_register_pointer()",

+         source->File);

+      return NULL;

+   }

+}

+

+

+/**

+ * Return a pointer to the 4-element float vector specified by the given

+ * destination register.

+ */

+static INLINE GLfloat *

+get_dst_register_pointer(const struct prog_dst_register *dest,

+                         struct gl_program_machine *machine)

+{

+   static GLfloat dummyReg[4];

+   GLint reg = dest->Index;

+

+   if (dest->RelAddr) {

+      /* add address register value to src index/offset */

+      reg += machine->AddressReg[0][0];

+      if (reg < 0) {

+         return dummyReg;

+      }

+   }

+

+   switch (dest->File) {

+   case PROGRAM_TEMPORARY:

+      if (reg >= MAX_PROGRAM_TEMPS)

+         return dummyReg;

+      return machine->Temporaries[reg];

+

+   case PROGRAM_OUTPUT:

+      if (reg >= MAX_PROGRAM_OUTPUTS)

+         return dummyReg;

+      return machine->Outputs[reg];

+

+   case PROGRAM_WRITE_ONLY:

+      return dummyReg;

+

+   default:

+      _mesa_problem(NULL,

+         "Invalid dest register file %d in get_dst_register_pointer()",

+         dest->File);

+      return NULL;

+   }

+}

+

+

+

+/**

+ * Fetch a 4-element float vector from the given source register.

+ * Apply swizzling and negating as needed.

+ */

+static void

+fetch_vector4(const struct prog_src_register *source,

+              const struct gl_program_machine *machine, GLfloat result[4])

+{

+   const GLfloat *src = get_src_register_pointer(source, machine);

+   ASSERT(src);

+

+   if (source->Swizzle == SWIZZLE_NOOP) {

+      /* no swizzling */

+      COPY_4V(result, src);

+   }

+   else {

+      ASSERT(GET_SWZ(source->Swizzle, 0) <= 3);

+      ASSERT(GET_SWZ(source->Swizzle, 1) <= 3);

+      ASSERT(GET_SWZ(source->Swizzle, 2) <= 3);

+      ASSERT(GET_SWZ(source->Swizzle, 3) <= 3);

+      result[0] = src[GET_SWZ(source->Swizzle, 0)];

+      result[1] = src[GET_SWZ(source->Swizzle, 1)];

+      result[2] = src[GET_SWZ(source->Swizzle, 2)];

+      result[3] = src[GET_SWZ(source->Swizzle, 3)];

+   }

+

+   if (source->Abs) {

+      result[0] = FABSF(result[0]);

+      result[1] = FABSF(result[1]);

+      result[2] = FABSF(result[2]);

+      result[3] = FABSF(result[3]);

+   }

+   if (source->Negate) {

+      ASSERT(source->Negate == NEGATE_XYZW);

+      result[0] = -result[0];

+      result[1] = -result[1];

+      result[2] = -result[2];

+      result[3] = -result[3];

+   }

+

+#ifdef NAN_CHECK

+   assert(!IS_INF_OR_NAN(result[0]));

+   assert(!IS_INF_OR_NAN(result[0]));

+   assert(!IS_INF_OR_NAN(result[0]));

+   assert(!IS_INF_OR_NAN(result[0]));

+#endif

+}

+

+

+/**

+ * Fetch a 4-element uint vector from the given source register.

+ * Apply swizzling but not negation/abs.

+ */

+static void

+fetch_vector4ui(const struct prog_src_register *source,

+                const struct gl_program_machine *machine, GLuint result[4])

+{

+   const GLuint *src = (GLuint *) get_src_register_pointer(source, machine);

+   ASSERT(src);

+

+   if (source->Swizzle == SWIZZLE_NOOP) {

+      /* no swizzling */

+      COPY_4V(result, src);

+   }

+   else {

+      ASSERT(GET_SWZ(source->Swizzle, 0) <= 3);

+      ASSERT(GET_SWZ(source->Swizzle, 1) <= 3);

+      ASSERT(GET_SWZ(source->Swizzle, 2) <= 3);

+      ASSERT(GET_SWZ(source->Swizzle, 3) <= 3);

+      result[0] = src[GET_SWZ(source->Swizzle, 0)];

+      result[1] = src[GET_SWZ(source->Swizzle, 1)];

+      result[2] = src[GET_SWZ(source->Swizzle, 2)];

+      result[3] = src[GET_SWZ(source->Swizzle, 3)];

+   }

+

+   /* Note: no Negate or Abs here */

+}

+

+

+

+/**

+ * Fetch the derivative with respect to X or Y for the given register.

+ * XXX this currently only works for fragment program input attribs.

+ */

+static void

+fetch_vector4_deriv(struct gl_context * ctx,

+                    const struct prog_src_register *source,

+                    const struct gl_program_machine *machine,

+                    char xOrY, GLfloat result[4])

+{

+   if (source->File == PROGRAM_INPUT &&

+       source->Index < (GLint) machine->NumDeriv) {

+      const GLint col = machine->CurElement;

+      const GLfloat w = machine->Attribs[FRAG_ATTRIB_WPOS][col][3];

+      const GLfloat invQ = 1.0f / w;

+      GLfloat deriv[4];

+

+      if (xOrY == 'X') {

+         deriv[0] = machine->DerivX[source->Index][0] * invQ;

+         deriv[1] = machine->DerivX[source->Index][1] * invQ;

+         deriv[2] = machine->DerivX[source->Index][2] * invQ;

+         deriv[3] = machine->DerivX[source->Index][3] * invQ;

+      }

+      else {

+         deriv[0] = machine->DerivY[source->Index][0] * invQ;

+         deriv[1] = machine->DerivY[source->Index][1] * invQ;

+         deriv[2] = machine->DerivY[source->Index][2] * invQ;

+         deriv[3] = machine->DerivY[source->Index][3] * invQ;

+      }

+

+      result[0] = deriv[GET_SWZ(source->Swizzle, 0)];

+      result[1] = deriv[GET_SWZ(source->Swizzle, 1)];

+      result[2] = deriv[GET_SWZ(source->Swizzle, 2)];

+      result[3] = deriv[GET_SWZ(source->Swizzle, 3)];

+      

+      if (source->Abs) {

+         result[0] = FABSF(result[0]);

+         result[1] = FABSF(result[1]);

+         result[2] = FABSF(result[2]);

+         result[3] = FABSF(result[3]);

+      }

+      if (source->Negate) {

+         ASSERT(source->Negate == NEGATE_XYZW);

+         result[0] = -result[0];

+         result[1] = -result[1];

+         result[2] = -result[2];

+         result[3] = -result[3];

+      }

+   }

+   else {

+      ASSIGN_4V(result, 0.0, 0.0, 0.0, 0.0);

+   }

+}

+

+

+/**

+ * As above, but only return result[0] element.

+ */

+static void

+fetch_vector1(const struct prog_src_register *source,

+              const struct gl_program_machine *machine, GLfloat result[4])

+{

+   const GLfloat *src = get_src_register_pointer(source, machine);

+   ASSERT(src);

+

+   result[0] = src[GET_SWZ(source->Swizzle, 0)];

+

+   if (source->Abs) {

+      result[0] = FABSF(result[0]);

+   }

+   if (source->Negate) {

+      result[0] = -result[0];

+   }

+}

+

+

+static GLuint

+fetch_vector1ui(const struct prog_src_register *source,

+                const struct gl_program_machine *machine)

+{

+   const GLuint *src = (GLuint *) get_src_register_pointer(source, machine);

+   return src[GET_SWZ(source->Swizzle, 0)];

+}

+

+

+/**

+ * Fetch texel from texture.  Use partial derivatives when possible.

+ */

+static INLINE void

+fetch_texel(struct gl_context *ctx,

+            const struct gl_program_machine *machine,

+            const struct prog_instruction *inst,

+            const GLfloat texcoord[4], GLfloat lodBias,

+            GLfloat color[4])

+{

+   const GLuint unit = machine->Samplers[inst->TexSrcUnit];

+

+   /* Note: we only have the right derivatives for fragment input attribs.

+    */

+   if (machine->NumDeriv > 0 &&

+       inst->SrcReg[0].File == PROGRAM_INPUT &&

+       inst->SrcReg[0].Index == FRAG_ATTRIB_TEX0 + inst->TexSrcUnit) {

+      /* simple texture fetch for which we should have derivatives */

+      GLuint attr = inst->SrcReg[0].Index;

+      machine->FetchTexelDeriv(ctx, texcoord,

+                               machine->DerivX[attr],

+                               machine->DerivY[attr],

+                               lodBias, unit, color);

+   }

+   else {

+      machine->FetchTexelLod(ctx, texcoord, lodBias, unit, color);

+   }

+}

+

+

+/**

+ * Test value against zero and return GT, LT, EQ or UN if NaN.

+ */

+static INLINE GLuint

+generate_cc(float value)

+{

+   if (value != value)

+      return COND_UN;           /* NaN */

+   if (value > 0.0F)

+      return COND_GT;

+   if (value < 0.0F)

+      return COND_LT;

+   return COND_EQ;

+}

+

+

+/**

+ * Test if the ccMaskRule is satisfied by the given condition code.

+ * Used to mask destination writes according to the current condition code.

+ */

+static INLINE GLboolean

+test_cc(GLuint condCode, GLuint ccMaskRule)

+{

+   switch (ccMaskRule) {

+   case COND_EQ: return (condCode == COND_EQ);

+   case COND_NE: return (condCode != COND_EQ);

+   case COND_LT: return (condCode == COND_LT);

+   case COND_GE: return (condCode == COND_GT || condCode == COND_EQ);

+   case COND_LE: return (condCode == COND_LT || condCode == COND_EQ);

+   case COND_GT: return (condCode == COND_GT);

+   case COND_TR: return GL_TRUE;

+   case COND_FL: return GL_FALSE;

+   default:      return GL_TRUE;

+   }

+}

+

+

+/**

+ * Evaluate the 4 condition codes against a predicate and return GL_TRUE

+ * or GL_FALSE to indicate result.

+ */

+static INLINE GLboolean

+eval_condition(const struct gl_program_machine *machine,

+               const struct prog_instruction *inst)

+{

+   const GLuint swizzle = inst->DstReg.CondSwizzle;

+   const GLuint condMask = inst->DstReg.CondMask;

+   if (test_cc(machine->CondCodes[GET_SWZ(swizzle, 0)], condMask) ||

+       test_cc(machine->CondCodes[GET_SWZ(swizzle, 1)], condMask) ||

+       test_cc(machine->CondCodes[GET_SWZ(swizzle, 2)], condMask) ||

+       test_cc(machine->CondCodes[GET_SWZ(swizzle, 3)], condMask)) {

+      return GL_TRUE;

+   }

+   else {

+      return GL_FALSE;

+   }

+}

+

+

+

+/**

+ * Store 4 floats into a register.  Observe the instructions saturate and

+ * set-condition-code flags.

+ */

+static void

+store_vector4(const struct prog_instruction *inst,

+              struct gl_program_machine *machine, const GLfloat value[4])

+{

+   const struct prog_dst_register *dstReg = &(inst->DstReg);

+   const GLboolean clamp = inst->SaturateMode == SATURATE_ZERO_ONE;

+   GLuint writeMask = dstReg->WriteMask;

+   GLfloat clampedValue[4];

+   GLfloat *dst = get_dst_register_pointer(dstReg, machine);

+

+#if 0

+   if (value[0] > 1.0e10 ||

+       IS_INF_OR_NAN(value[0]) ||

+       IS_INF_OR_NAN(value[1]) ||

+       IS_INF_OR_NAN(value[2]) || IS_INF_OR_NAN(value[3]))

+      printf("store %g %g %g %g\n", value[0], value[1], value[2], value[3]);

+#endif

+

+   if (clamp) {

+      clampedValue[0] = CLAMP(value[0], 0.0F, 1.0F);

+      clampedValue[1] = CLAMP(value[1], 0.0F, 1.0F);

+      clampedValue[2] = CLAMP(value[2], 0.0F, 1.0F);

+      clampedValue[3] = CLAMP(value[3], 0.0F, 1.0F);

+      value = clampedValue;

+   }

+

+   if (dstReg->CondMask != COND_TR) {

+      /* condition codes may turn off some writes */

+      if (writeMask & WRITEMASK_X) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 0)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_X;

+      }

+      if (writeMask & WRITEMASK_Y) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 1)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_Y;

+      }

+      if (writeMask & WRITEMASK_Z) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 2)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_Z;

+      }

+      if (writeMask & WRITEMASK_W) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 3)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_W;

+      }

+   }

+

+#ifdef NAN_CHECK

+   assert(!IS_INF_OR_NAN(value[0]));

+   assert(!IS_INF_OR_NAN(value[0]));

+   assert(!IS_INF_OR_NAN(value[0]));

+   assert(!IS_INF_OR_NAN(value[0]));

+#endif

+

+   if (writeMask & WRITEMASK_X)

+      dst[0] = value[0];

+   if (writeMask & WRITEMASK_Y)

+      dst[1] = value[1];

+   if (writeMask & WRITEMASK_Z)

+      dst[2] = value[2];

+   if (writeMask & WRITEMASK_W)

+      dst[3] = value[3];

+

+   if (inst->CondUpdate) {

+      if (writeMask & WRITEMASK_X)

+         machine->CondCodes[0] = generate_cc(value[0]);

+      if (writeMask & WRITEMASK_Y)

+         machine->CondCodes[1] = generate_cc(value[1]);

+      if (writeMask & WRITEMASK_Z)

+         machine->CondCodes[2] = generate_cc(value[2]);

+      if (writeMask & WRITEMASK_W)

+         machine->CondCodes[3] = generate_cc(value[3]);

+#if DEBUG_PROG

+      printf("CondCodes=(%s,%s,%s,%s) for:\n",

+             _mesa_condcode_string(machine->CondCodes[0]),

+             _mesa_condcode_string(machine->CondCodes[1]),

+             _mesa_condcode_string(machine->CondCodes[2]),

+             _mesa_condcode_string(machine->CondCodes[3]));

+#endif

+   }

+}

+

+

+/**

+ * Store 4 uints into a register.  Observe the set-condition-code flags.

+ */

+static void

+store_vector4ui(const struct prog_instruction *inst,

+                struct gl_program_machine *machine, const GLuint value[4])

+{

+   const struct prog_dst_register *dstReg = &(inst->DstReg);

+   GLuint writeMask = dstReg->WriteMask;

+   GLuint *dst = (GLuint *) get_dst_register_pointer(dstReg, machine);

+

+   if (dstReg->CondMask != COND_TR) {

+      /* condition codes may turn off some writes */

+      if (writeMask & WRITEMASK_X) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 0)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_X;

+      }

+      if (writeMask & WRITEMASK_Y) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 1)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_Y;

+      }

+      if (writeMask & WRITEMASK_Z) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 2)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_Z;

+      }

+      if (writeMask & WRITEMASK_W) {

+         if (!test_cc(machine->CondCodes[GET_SWZ(dstReg->CondSwizzle, 3)],

+                      dstReg->CondMask))

+            writeMask &= ~WRITEMASK_W;

+      }

+   }

+

+   if (writeMask & WRITEMASK_X)

+      dst[0] = value[0];

+   if (writeMask & WRITEMASK_Y)

+      dst[1] = value[1];

+   if (writeMask & WRITEMASK_Z)

+      dst[2] = value[2];

+   if (writeMask & WRITEMASK_W)

+      dst[3] = value[3];

+

+   if (inst->CondUpdate) {

+      if (writeMask & WRITEMASK_X)

+         machine->CondCodes[0] = generate_cc((float)value[0]);

+      if (writeMask & WRITEMASK_Y)

+         machine->CondCodes[1] = generate_cc((float)value[1]);

+      if (writeMask & WRITEMASK_Z)

+         machine->CondCodes[2] = generate_cc((float)value[2]);

+      if (writeMask & WRITEMASK_W)

+         machine->CondCodes[3] = generate_cc((float)value[3]);

+#if DEBUG_PROG

+      printf("CondCodes=(%s,%s,%s,%s) for:\n",

+             _mesa_condcode_string(machine->CondCodes[0]),

+             _mesa_condcode_string(machine->CondCodes[1]),

+             _mesa_condcode_string(machine->CondCodes[2]),

+             _mesa_condcode_string(machine->CondCodes[3]));

+#endif

+   }

+}

+

+

+

+/**

+ * Execute the given vertex/fragment program.

+ *

+ * \param ctx  rendering context

+ * \param program  the program to execute

+ * \param machine  machine state (must be initialized)

+ * \return GL_TRUE if program completed or GL_FALSE if program executed KIL.

+ */

+GLboolean

+_mesa_execute_program(struct gl_context * ctx,

+                      const struct gl_program *program,

+                      struct gl_program_machine *machine)

+{

+   const GLuint numInst = program->NumInstructions;

+   const GLuint maxExec = 10000;

+   GLuint pc, numExec = 0;

+

+   machine->CurProgram = program;

+

+   if (DEBUG_PROG) {

+      printf("execute program %u --------------------\n", program->Id);

+   }

+

+   if (program->Target == GL_VERTEX_PROGRAM_ARB) {

+      machine->EnvParams = ctx->VertexProgram.Parameters;

+   }

+   else {

+      machine->EnvParams = ctx->FragmentProgram.Parameters;

+   }

+

+   for (pc = 0; pc < numInst; pc++) {

+      const struct prog_instruction *inst = program->Instructions + pc;

+

+      if (DEBUG_PROG) {

+         _mesa_print_instruction(inst);

+      }

+

+      switch (inst->Opcode) {

+      case OPCODE_ABS:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] = FABSF(a[0]);

+            result[1] = FABSF(a[1]);

+            result[2] = FABSF(a[2]);

+            result[3] = FABSF(a[3]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_ADD:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = a[0] + b[0];

+            result[1] = a[1] + b[1];

+            result[2] = a[2] + b[2];

+            result[3] = a[3] + b[3];

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("ADD (%g %g %g %g) = (%g %g %g %g) + (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_AND:     /* bitwise AND */

+         {

+            GLuint a[4], b[4], result[4];

+            fetch_vector4ui(&inst->SrcReg[0], machine, a);

+            fetch_vector4ui(&inst->SrcReg[1], machine, b);

+            result[0] = a[0] & b[0];

+            result[1] = a[1] & b[1];

+            result[2] = a[2] & b[2];

+            result[3] = a[3] & b[3];

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_ARL:

+         {

+            GLfloat t[4];

+            fetch_vector4(&inst->SrcReg[0], machine, t);

+            machine->AddressReg[0][0] = IFLOOR(t[0]);

+            if (DEBUG_PROG) {

+               printf("ARL %d\n", machine->AddressReg[0][0]);

+            }

+         }

+         break;

+      case OPCODE_BGNLOOP:

+         /* no-op */

+         ASSERT(program->Instructions[inst->BranchTarget].Opcode

+                == OPCODE_ENDLOOP);

+         break;

+      case OPCODE_ENDLOOP:

+         /* subtract 1 here since pc is incremented by for(pc) loop */

+         ASSERT(program->Instructions[inst->BranchTarget].Opcode

+                == OPCODE_BGNLOOP);

+         pc = inst->BranchTarget - 1;   /* go to matching BNGLOOP */

+         break;

+      case OPCODE_BGNSUB:      /* begin subroutine */

+         break;

+      case OPCODE_ENDSUB:      /* end subroutine */

+         break;

+      case OPCODE_BRA:         /* branch (conditional) */

+         if (eval_condition(machine, inst)) {

+            /* take branch */

+            /* Subtract 1 here since we'll do pc++ below */

+            pc = inst->BranchTarget - 1;

+         }

+         break;

+      case OPCODE_BRK:         /* break out of loop (conditional) */

+         ASSERT(program->Instructions[inst->BranchTarget].Opcode

+                == OPCODE_ENDLOOP);

+         if (eval_condition(machine, inst)) {

+            /* break out of loop */

+            /* pc++ at end of for-loop will put us after the ENDLOOP inst */

+            pc = inst->BranchTarget;

+         }

+         break;

+      case OPCODE_CONT:        /* continue loop (conditional) */

+         ASSERT(program->Instructions[inst->BranchTarget].Opcode

+                == OPCODE_ENDLOOP);

+         if (eval_condition(machine, inst)) {

+            /* continue at ENDLOOP */

+            /* Subtract 1 here since we'll do pc++ at end of for-loop */

+            pc = inst->BranchTarget - 1;

+         }

+         break;

+      case OPCODE_CAL:         /* Call subroutine (conditional) */

+         if (eval_condition(machine, inst)) {

+            /* call the subroutine */

+            if (machine->StackDepth >= MAX_PROGRAM_CALL_DEPTH) {

+               return GL_TRUE;  /* Per GL_NV_vertex_program2 spec */

+            }

+            machine->CallStack[machine->StackDepth++] = pc + 1; /* next inst */

+            /* Subtract 1 here since we'll do pc++ at end of for-loop */

+            pc = inst->BranchTarget - 1;

+         }

+         break;

+      case OPCODE_CMP:

+         {

+            GLfloat a[4], b[4], c[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            fetch_vector4(&inst->SrcReg[2], machine, c);

+            result[0] = a[0] < 0.0F ? b[0] : c[0];

+            result[1] = a[1] < 0.0F ? b[1] : c[1];

+            result[2] = a[2] < 0.0F ? b[2] : c[2];

+            result[3] = a[3] < 0.0F ? b[3] : c[3];

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("CMP (%g %g %g %g) = (%g %g %g %g) < 0 ? (%g %g %g %g) : (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3],

+                      c[0], c[1], c[2], c[3]);

+            }

+         }

+         break;

+      case OPCODE_COS:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            result[0] = result[1] = result[2] = result[3]

+               = (GLfloat) cos(a[0]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_DDX:         /* Partial derivative with respect to X */

+         {

+            GLfloat result[4];

+            fetch_vector4_deriv(ctx, &inst->SrcReg[0], machine,

+                                'X', result);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_DDY:         /* Partial derivative with respect to Y */

+         {

+            GLfloat result[4];

+            fetch_vector4_deriv(ctx, &inst->SrcReg[0], machine,

+                                'Y', result);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_DP2:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = result[1] = result[2] = result[3] = DOT2(a, b);

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("DP2 %g = (%g %g) . (%g %g)\n",

+                      result[0], a[0], a[1], b[0], b[1]);

+            }

+         }

+         break;

+      case OPCODE_DP2A:

+         {

+            GLfloat a[4], b[4], c, result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            fetch_vector1(&inst->SrcReg[1], machine, &c);

+            result[0] = result[1] = result[2] = result[3] = DOT2(a, b) + c;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("DP2A %g = (%g %g) . (%g %g) + %g\n",

+                      result[0], a[0], a[1], b[0], b[1], c);

+            }

+         }

+         break;

+      case OPCODE_DP3:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = result[1] = result[2] = result[3] = DOT3(a, b);

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("DP3 %g = (%g %g %g) . (%g %g %g)\n",

+                      result[0], a[0], a[1], a[2], b[0], b[1], b[2]);

+            }

+         }

+         break;

+      case OPCODE_DP4:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = result[1] = result[2] = result[3] = DOT4(a, b);

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("DP4 %g = (%g, %g %g %g) . (%g, %g %g %g)\n",

+                      result[0], a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_DPH:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = result[1] = result[2] = result[3] = DOT3(a, b) + b[3];

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_DST:         /* Distance vector */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = 1.0F;

+            result[1] = a[1] * b[1];

+            result[2] = a[2];

+            result[3] = b[3];

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_EXP:

+         {

+            GLfloat t[4], q[4], floor_t0;

+            fetch_vector1(&inst->SrcReg[0], machine, t);

+            floor_t0 = FLOORF(t[0]);

+            if (floor_t0 > FLT_MAX_EXP) {

+               SET_POS_INFINITY(q[0]);

+               SET_POS_INFINITY(q[2]);

+            }

+            else if (floor_t0 < FLT_MIN_EXP) {

+               q[0] = 0.0F;

+               q[2] = 0.0F;

+            }

+            else {

+               q[0] = LDEXPF(1.0, (int) floor_t0);

+               /* Note: GL_NV_vertex_program expects 

+                * result.z = result.x * APPX(result.y)

+                * We do what the ARB extension says.

+                */

+               q[2] = (GLfloat) pow(2.0, t[0]);

+            }

+            q[1] = t[0] - floor_t0;

+            q[3] = 1.0F;

+            store_vector4( inst, machine, q );

+         }

+         break;

+      case OPCODE_EX2:         /* Exponential base 2 */

+         {

+            GLfloat a[4], result[4], val;

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            val = (GLfloat) pow(2.0, a[0]);

+            /*

+            if (IS_INF_OR_NAN(val))

+               val = 1.0e10;

+            */

+            result[0] = result[1] = result[2] = result[3] = val;

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_FLR:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] = FLOORF(a[0]);

+            result[1] = FLOORF(a[1]);

+            result[2] = FLOORF(a[2]);

+            result[3] = FLOORF(a[3]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_FRC:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] = a[0] - FLOORF(a[0]);

+            result[1] = a[1] - FLOORF(a[1]);

+            result[2] = a[2] - FLOORF(a[2]);

+            result[3] = a[3] - FLOORF(a[3]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_IF:

+         {

+            GLboolean cond;

+            ASSERT(program->Instructions[inst->BranchTarget].Opcode

+                   == OPCODE_ELSE ||

+                   program->Instructions[inst->BranchTarget].Opcode

+                   == OPCODE_ENDIF);

+            /* eval condition */

+            if (inst->SrcReg[0].File != PROGRAM_UNDEFINED) {

+               GLfloat a[4];

+               fetch_vector1(&inst->SrcReg[0], machine, a);

+               cond = (a[0] != 0.0);

+            }

+            else {

+               cond = eval_condition(machine, inst);

+            }

+            if (DEBUG_PROG) {

+               printf("IF: %d\n", cond);

+            }

+            /* do if/else */

+            if (cond) {

+               /* do if-clause (just continue execution) */

+            }

+            else {

+               /* go to the instruction after ELSE or ENDIF */

+               assert(inst->BranchTarget >= 0);

+               pc = inst->BranchTarget;

+            }

+         }

+         break;

+      case OPCODE_ELSE:

+         /* goto ENDIF */

+         ASSERT(program->Instructions[inst->BranchTarget].Opcode

+                == OPCODE_ENDIF);

+         assert(inst->BranchTarget >= 0);

+         pc = inst->BranchTarget;

+         break;

+      case OPCODE_ENDIF:

+         /* nothing */

+         break;

+      case OPCODE_KIL_NV:      /* NV_f_p only (conditional) */

+         if (eval_condition(machine, inst)) {

+            return GL_FALSE;

+         }

+         break;

+      case OPCODE_KIL:         /* ARB_f_p only */

+         {

+            GLfloat a[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            if (DEBUG_PROG) {

+               printf("KIL if (%g %g %g %g) <= 0.0\n",

+                      a[0], a[1], a[2], a[3]);

+            }

+

+            if (a[0] < 0.0F || a[1] < 0.0F || a[2] < 0.0F || a[3] < 0.0F) {

+               return GL_FALSE;

+            }

+         }

+         break;

+      case OPCODE_LG2:         /* log base 2 */

+         {

+            GLfloat a[4], result[4], val;

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+	    /* The fast LOG2 macro doesn't meet the precision requirements.

+	     */

+            if (a[0] == 0.0F) {

+               val = -FLT_MAX;

+            }

+            else {

+               val = (float)(log(a[0]) * 1.442695F);

+            }

+            result[0] = result[1] = result[2] = result[3] = val;

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_LIT:

+         {

+            const GLfloat epsilon = 1.0F / 256.0F;      /* from NV VP spec */

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            a[0] = MAX2(a[0], 0.0F);

+            a[1] = MAX2(a[1], 0.0F);

+            /* XXX ARB version clamps a[3], NV version doesn't */

+            a[3] = CLAMP(a[3], -(128.0F - epsilon), (128.0F - epsilon));

+            result[0] = 1.0F;

+            result[1] = a[0];

+            /* XXX we could probably just use pow() here */

+            if (a[0] > 0.0F) {

+               if (a[1] == 0.0 && a[3] == 0.0)

+                  result[2] = 1.0F;

+               else

+                  result[2] = (GLfloat) pow(a[1], a[3]);

+            }

+            else {

+               result[2] = 0.0F;

+            }

+            result[3] = 1.0F;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("LIT (%g %g %g %g) : (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3]);

+            }

+         }

+         break;

+      case OPCODE_LOG:

+         {

+            GLfloat t[4], q[4], abs_t0;

+            fetch_vector1(&inst->SrcReg[0], machine, t);

+            abs_t0 = FABSF(t[0]);

+            if (abs_t0 != 0.0F) {

+               /* Since we really can't handle infinite values on VMS

+                * like other OSes we'll use __MAXFLOAT to represent

+                * infinity.  This may need some tweaking.

+                */

+#ifdef VMS

+               if (abs_t0 == __MAXFLOAT)

+#else

+               if (IS_INF_OR_NAN(abs_t0))

+#endif

+               {

+                  SET_POS_INFINITY(q[0]);

+                  q[1] = 1.0F;

+                  SET_POS_INFINITY(q[2]);

+               }

+               else {

+                  int exponent;

+                  GLfloat mantissa = FREXPF(t[0], &exponent);

+                  q[0] = (GLfloat) (exponent - 1);

+                  q[1] = (GLfloat) (2.0 * mantissa); /* map [.5, 1) -> [1, 2) */

+

+		  /* The fast LOG2 macro doesn't meet the precision

+		   * requirements.

+		   */

+                  q[2] = (float)(log(t[0]) * 1.442695F);

+               }

+            }

+            else {

+               SET_NEG_INFINITY(q[0]);

+               q[1] = 1.0F;

+               SET_NEG_INFINITY(q[2]);

+            }

+            q[3] = 1.0;

+            store_vector4(inst, machine, q);

+         }

+         break;

+      case OPCODE_LRP:

+         {

+            GLfloat a[4], b[4], c[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            fetch_vector4(&inst->SrcReg[2], machine, c);

+            result[0] = a[0] * b[0] + (1.0F - a[0]) * c[0];

+            result[1] = a[1] * b[1] + (1.0F - a[1]) * c[1];

+            result[2] = a[2] * b[2] + (1.0F - a[2]) * c[2];

+            result[3] = a[3] * b[3] + (1.0F - a[3]) * c[3];

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("LRP (%g %g %g %g) = (%g %g %g %g), "

+                      "(%g %g %g %g), (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3], c[0], c[1], c[2], c[3]);

+            }

+         }

+         break;

+      case OPCODE_MAD:

+         {

+            GLfloat a[4], b[4], c[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            fetch_vector4(&inst->SrcReg[2], machine, c);

+            result[0] = a[0] * b[0] + c[0];

+            result[1] = a[1] * b[1] + c[1];

+            result[2] = a[2] * b[2] + c[2];

+            result[3] = a[3] * b[3] + c[3];

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("MAD (%g %g %g %g) = (%g %g %g %g) * "

+                      "(%g %g %g %g) + (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3], c[0], c[1], c[2], c[3]);

+            }

+         }

+         break;

+      case OPCODE_MAX:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = MAX2(a[0], b[0]);

+            result[1] = MAX2(a[1], b[1]);

+            result[2] = MAX2(a[2], b[2]);

+            result[3] = MAX2(a[3], b[3]);

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("MAX (%g %g %g %g) = (%g %g %g %g), (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_MIN:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = MIN2(a[0], b[0]);

+            result[1] = MIN2(a[1], b[1]);

+            result[2] = MIN2(a[2], b[2]);

+            result[3] = MIN2(a[3], b[3]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_MOV:

+         {

+            GLfloat result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, result);

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("MOV (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3]);

+            }

+         }

+         break;

+      case OPCODE_MUL:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = a[0] * b[0];

+            result[1] = a[1] * b[1];

+            result[2] = a[2] * b[2];

+            result[3] = a[3] * b[3];

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("MUL (%g %g %g %g) = (%g %g %g %g) * (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_NOISE1:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            result[0] =

+               result[1] =

+               result[2] =

+               result[3] = _mesa_noise1(a[0]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_NOISE2:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] =

+               result[1] =

+               result[2] = result[3] = _mesa_noise2(a[0], a[1]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_NOISE3:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] =

+               result[1] =

+               result[2] =

+               result[3] = _mesa_noise3(a[0], a[1], a[2]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_NOISE4:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] =

+               result[1] =

+               result[2] =

+               result[3] = _mesa_noise4(a[0], a[1], a[2], a[3]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_NOP:

+         break;

+      case OPCODE_NOT:         /* bitwise NOT */

+         {

+            GLuint a[4], result[4];

+            fetch_vector4ui(&inst->SrcReg[0], machine, a);

+            result[0] = ~a[0];

+            result[1] = ~a[1];

+            result[2] = ~a[2];

+            result[3] = ~a[3];

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_NRM3:        /* 3-component normalization */

+         {

+            GLfloat a[4], result[4];

+            GLfloat tmp;

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            tmp = a[0] * a[0] + a[1] * a[1] + a[2] * a[2];

+            if (tmp != 0.0F)

+               tmp = INV_SQRTF(tmp);

+            result[0] = tmp * a[0];

+            result[1] = tmp * a[1];

+            result[2] = tmp * a[2];

+            result[3] = 0.0;  /* undefined, but prevent valgrind warnings */

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_NRM4:        /* 4-component normalization */

+         {

+            GLfloat a[4], result[4];

+            GLfloat tmp;

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            tmp = a[0] * a[0] + a[1] * a[1] + a[2] * a[2] + a[3] * a[3];

+            if (tmp != 0.0F)

+               tmp = INV_SQRTF(tmp);

+            result[0] = tmp * a[0];

+            result[1] = tmp * a[1];

+            result[2] = tmp * a[2];

+            result[3] = tmp * a[3];

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_OR:          /* bitwise OR */

+         {

+            GLuint a[4], b[4], result[4];

+            fetch_vector4ui(&inst->SrcReg[0], machine, a);

+            fetch_vector4ui(&inst->SrcReg[1], machine, b);

+            result[0] = a[0] | b[0];

+            result[1] = a[1] | b[1];

+            result[2] = a[2] | b[2];

+            result[3] = a[3] | b[3];

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_PK2H:        /* pack two 16-bit floats in one 32-bit float */

+         {

+            GLfloat a[4];

+            GLuint result[4];

+            GLhalfNV hx, hy;

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            hx = _mesa_float_to_half(a[0]);

+            hy = _mesa_float_to_half(a[1]);

+            result[0] =

+            result[1] =

+            result[2] =

+            result[3] = hx | (hy << 16);

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_PK2US:       /* pack two GLushorts into one 32-bit float */

+         {

+            GLfloat a[4];

+            GLuint result[4], usx, usy;

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            a[0] = CLAMP(a[0], 0.0F, 1.0F);

+            a[1] = CLAMP(a[1], 0.0F, 1.0F);

+            usx = IROUND(a[0] * 65535.0F);

+            usy = IROUND(a[1] * 65535.0F);

+            result[0] =

+            result[1] =

+            result[2] =

+            result[3] = usx | (usy << 16);

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_PK4B:        /* pack four GLbytes into one 32-bit float */

+         {

+            GLfloat a[4];

+            GLuint result[4], ubx, uby, ubz, ubw;

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            a[0] = CLAMP(a[0], -128.0F / 127.0F, 1.0F);

+            a[1] = CLAMP(a[1], -128.0F / 127.0F, 1.0F);

+            a[2] = CLAMP(a[2], -128.0F / 127.0F, 1.0F);

+            a[3] = CLAMP(a[3], -128.0F / 127.0F, 1.0F);

+            ubx = IROUND(127.0F * a[0] + 128.0F);

+            uby = IROUND(127.0F * a[1] + 128.0F);

+            ubz = IROUND(127.0F * a[2] + 128.0F);

+            ubw = IROUND(127.0F * a[3] + 128.0F);

+            result[0] =

+            result[1] =

+            result[2] =

+            result[3] = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_PK4UB:       /* pack four GLubytes into one 32-bit float */

+         {

+            GLfloat a[4];

+            GLuint result[4], ubx, uby, ubz, ubw;

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            a[0] = CLAMP(a[0], 0.0F, 1.0F);

+            a[1] = CLAMP(a[1], 0.0F, 1.0F);

+            a[2] = CLAMP(a[2], 0.0F, 1.0F);

+            a[3] = CLAMP(a[3], 0.0F, 1.0F);

+            ubx = IROUND(255.0F * a[0]);

+            uby = IROUND(255.0F * a[1]);

+            ubz = IROUND(255.0F * a[2]);

+            ubw = IROUND(255.0F * a[3]);

+            result[0] =

+            result[1] =

+            result[2] =

+            result[3] = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_POW:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            fetch_vector1(&inst->SrcReg[1], machine, b);

+            result[0] = result[1] = result[2] = result[3]

+               = (GLfloat) pow(a[0], b[0]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_RCC:  /* clamped riciprocal */

+         {

+            const float largest = 1.884467e+19, smallest = 5.42101e-20;

+            GLfloat a[4], r, result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            if (DEBUG_PROG) {

+               if (a[0] == 0)

+                  printf("RCC(0)\n");

+               else if (IS_INF_OR_NAN(a[0]))

+                  printf("RCC(inf)\n");

+            }

+            if (a[0] == 1.0F) {

+               r = 1.0F;

+            }

+            else {

+               r = 1.0F / a[0];

+            }

+            if (positive(r)) {

+               if (r > largest) {

+                  r = largest;

+               }

+               else if (r < smallest) {

+                  r = smallest;

+               }

+            }

+            else {

+               if (r < -largest) {

+                  r = -largest;

+               }

+               else if (r > -smallest) {

+                  r = -smallest;

+               }

+            }

+            result[0] = result[1] = result[2] = result[3] = r;

+            store_vector4(inst, machine, result);

+         }

+         break;

+

+      case OPCODE_RCP:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            if (DEBUG_PROG) {

+               if (a[0] == 0)

+                  printf("RCP(0)\n");

+               else if (IS_INF_OR_NAN(a[0]))

+                  printf("RCP(inf)\n");

+            }

+            result[0] = result[1] = result[2] = result[3] = 1.0F / a[0];

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_RET:         /* return from subroutine (conditional) */

+         if (eval_condition(machine, inst)) {

+            if (machine->StackDepth == 0) {

+               return GL_TRUE;  /* Per GL_NV_vertex_program2 spec */

+            }

+            /* subtract one because of pc++ in the for loop */

+            pc = machine->CallStack[--machine->StackDepth] - 1;

+         }

+         break;

+      case OPCODE_RFL:         /* reflection vector */

+         {

+            GLfloat axis[4], dir[4], result[4], tmpX, tmpW;

+            fetch_vector4(&inst->SrcReg[0], machine, axis);

+            fetch_vector4(&inst->SrcReg[1], machine, dir);

+            tmpW = DOT3(axis, axis);

+            tmpX = (2.0F * DOT3(axis, dir)) / tmpW;

+            result[0] = tmpX * axis[0] - dir[0];

+            result[1] = tmpX * axis[1] - dir[1];

+            result[2] = tmpX * axis[2] - dir[2];

+            /* result[3] is never written! XXX enforce in parser! */

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_RSQ:         /* 1 / sqrt() */

+         {

+            GLfloat a[4], result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            a[0] = FABSF(a[0]);

+            result[0] = result[1] = result[2] = result[3] = INV_SQRTF(a[0]);

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("RSQ %g = 1/sqrt(|%g|)\n", result[0], a[0]);

+            }

+         }

+         break;

+      case OPCODE_SCS:         /* sine and cos */

+         {

+            GLfloat a[4], result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            result[0] = (GLfloat) cos(a[0]);

+            result[1] = (GLfloat) sin(a[0]);

+            result[2] = 0.0;    /* undefined! */

+            result[3] = 0.0;    /* undefined! */

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_SEQ:         /* set on equal */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = (a[0] == b[0]) ? 1.0F : 0.0F;

+            result[1] = (a[1] == b[1]) ? 1.0F : 0.0F;

+            result[2] = (a[2] == b[2]) ? 1.0F : 0.0F;

+            result[3] = (a[3] == b[3]) ? 1.0F : 0.0F;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("SEQ (%g %g %g %g) = (%g %g %g %g) == (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_SFL:         /* set false, operands ignored */

+         {

+            static const GLfloat result[4] = { 0.0F, 0.0F, 0.0F, 0.0F };

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_SGE:         /* set on greater or equal */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = (a[0] >= b[0]) ? 1.0F : 0.0F;

+            result[1] = (a[1] >= b[1]) ? 1.0F : 0.0F;

+            result[2] = (a[2] >= b[2]) ? 1.0F : 0.0F;

+            result[3] = (a[3] >= b[3]) ? 1.0F : 0.0F;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("SGE (%g %g %g %g) = (%g %g %g %g) >= (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_SGT:         /* set on greater */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = (a[0] > b[0]) ? 1.0F : 0.0F;

+            result[1] = (a[1] > b[1]) ? 1.0F : 0.0F;

+            result[2] = (a[2] > b[2]) ? 1.0F : 0.0F;

+            result[3] = (a[3] > b[3]) ? 1.0F : 0.0F;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("SGT (%g %g %g %g) = (%g %g %g %g) > (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_SIN:

+         {

+            GLfloat a[4], result[4];

+            fetch_vector1(&inst->SrcReg[0], machine, a);

+            result[0] = result[1] = result[2] = result[3]

+               = (GLfloat) sin(a[0]);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_SLE:         /* set on less or equal */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = (a[0] <= b[0]) ? 1.0F : 0.0F;

+            result[1] = (a[1] <= b[1]) ? 1.0F : 0.0F;

+            result[2] = (a[2] <= b[2]) ? 1.0F : 0.0F;

+            result[3] = (a[3] <= b[3]) ? 1.0F : 0.0F;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("SLE (%g %g %g %g) = (%g %g %g %g) <= (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_SLT:         /* set on less */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = (a[0] < b[0]) ? 1.0F : 0.0F;

+            result[1] = (a[1] < b[1]) ? 1.0F : 0.0F;

+            result[2] = (a[2] < b[2]) ? 1.0F : 0.0F;

+            result[3] = (a[3] < b[3]) ? 1.0F : 0.0F;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("SLT (%g %g %g %g) = (%g %g %g %g) < (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_SNE:         /* set on not equal */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = (a[0] != b[0]) ? 1.0F : 0.0F;

+            result[1] = (a[1] != b[1]) ? 1.0F : 0.0F;

+            result[2] = (a[2] != b[2]) ? 1.0F : 0.0F;

+            result[3] = (a[3] != b[3]) ? 1.0F : 0.0F;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("SNE (%g %g %g %g) = (%g %g %g %g) != (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3],

+                      b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_SSG:         /* set sign (-1, 0 or +1) */

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] = (GLfloat) ((a[0] > 0.0F) - (a[0] < 0.0F));

+            result[1] = (GLfloat) ((a[1] > 0.0F) - (a[1] < 0.0F));

+            result[2] = (GLfloat) ((a[2] > 0.0F) - (a[2] < 0.0F));

+            result[3] = (GLfloat) ((a[3] > 0.0F) - (a[3] < 0.0F));

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_STR:         /* set true, operands ignored */

+         {

+            static const GLfloat result[4] = { 1.0F, 1.0F, 1.0F, 1.0F };

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_SUB:

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = a[0] - b[0];

+            result[1] = a[1] - b[1];

+            result[2] = a[2] - b[2];

+            result[3] = a[3] - b[3];

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("SUB (%g %g %g %g) = (%g %g %g %g) - (%g %g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);

+            }

+         }

+         break;

+      case OPCODE_SWZ:         /* extended swizzle */

+         {

+            const struct prog_src_register *source = &inst->SrcReg[0];

+            const GLfloat *src = get_src_register_pointer(source, machine);

+            GLfloat result[4];

+            GLuint i;

+            for (i = 0; i < 4; i++) {

+               const GLuint swz = GET_SWZ(source->Swizzle, i);

+               if (swz == SWIZZLE_ZERO)

+                  result[i] = 0.0;

+               else if (swz == SWIZZLE_ONE)

+                  result[i] = 1.0;

+               else {

+                  ASSERT(swz >= 0);

+                  ASSERT(swz <= 3);

+                  result[i] = src[swz];

+               }

+               if (source->Negate & (1 << i))

+                  result[i] = -result[i];

+            }

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_TEX:         /* Both ARB and NV frag prog */

+         /* Simple texel lookup */

+         {

+            GLfloat texcoord[4], color[4];

+            fetch_vector4(&inst->SrcReg[0], machine, texcoord);

+

+            fetch_texel(ctx, machine, inst, texcoord, 0.0, color);

+

+            if (DEBUG_PROG) {

+               printf("TEX (%g, %g, %g, %g) = texture[%d][%g, %g, %g, %g]\n",

+                      color[0], color[1], color[2], color[3],

+                      inst->TexSrcUnit,

+                      texcoord[0], texcoord[1], texcoord[2], texcoord[3]);

+            }

+            store_vector4(inst, machine, color);

+         }

+         break;

+      case OPCODE_TXB:         /* GL_ARB_fragment_program only */

+         /* Texel lookup with LOD bias */

+         {

+            GLfloat texcoord[4], color[4], lodBias;

+

+            fetch_vector4(&inst->SrcReg[0], machine, texcoord);

+

+            /* texcoord[3] is the bias to add to lambda */

+            lodBias = texcoord[3];

+

+            fetch_texel(ctx, machine, inst, texcoord, lodBias, color);

+

+            if (DEBUG_PROG) {

+               printf("TXB (%g, %g, %g, %g) = texture[%d][%g %g %g %g]"

+                      "  bias %g\n",

+                      color[0], color[1], color[2], color[3],

+                      inst->TexSrcUnit,

+                      texcoord[0],

+                      texcoord[1],

+                      texcoord[2],

+                      texcoord[3],

+                      lodBias);

+            }

+

+            store_vector4(inst, machine, color);

+         }

+         break;

+      case OPCODE_TXD:         /* GL_NV_fragment_program only */

+         /* Texture lookup w/ partial derivatives for LOD */

+         {

+            GLfloat texcoord[4], dtdx[4], dtdy[4], color[4];

+            fetch_vector4(&inst->SrcReg[0], machine, texcoord);

+            fetch_vector4(&inst->SrcReg[1], machine, dtdx);

+            fetch_vector4(&inst->SrcReg[2], machine, dtdy);

+            machine->FetchTexelDeriv(ctx, texcoord, dtdx, dtdy,

+                                     0.0, /* lodBias */

+                                     inst->TexSrcUnit, color);

+            store_vector4(inst, machine, color);

+         }

+         break;

+      case OPCODE_TXL:

+         /* Texel lookup with explicit LOD */

+         {

+            GLfloat texcoord[4], color[4], lod;

+

+            fetch_vector4(&inst->SrcReg[0], machine, texcoord);

+

+            /* texcoord[3] is the LOD */

+            lod = texcoord[3];

+

+	    machine->FetchTexelLod(ctx, texcoord, lod,

+				   machine->Samplers[inst->TexSrcUnit], color);

+

+            store_vector4(inst, machine, color);

+         }

+         break;

+      case OPCODE_TXP:         /* GL_ARB_fragment_program only */

+         /* Texture lookup w/ projective divide */

+         {

+            GLfloat texcoord[4], color[4];

+

+            fetch_vector4(&inst->SrcReg[0], machine, texcoord);

+            /* Not so sure about this test - if texcoord[3] is

+             * zero, we'd probably be fine except for an ASSERT in

+             * IROUND_POS() which gets triggered by the inf values created.

+             */

+            if (texcoord[3] != 0.0) {

+               texcoord[0] /= texcoord[3];

+               texcoord[1] /= texcoord[3];

+               texcoord[2] /= texcoord[3];

+            }

+

+            fetch_texel(ctx, machine, inst, texcoord, 0.0, color);

+

+            store_vector4(inst, machine, color);

+         }

+         break;

+      case OPCODE_TXP_NV:      /* GL_NV_fragment_program only */

+         /* Texture lookup w/ projective divide, as above, but do not

+          * do the divide by w if sampling from a cube map.

+          */

+         {

+            GLfloat texcoord[4], color[4];

+

+            fetch_vector4(&inst->SrcReg[0], machine, texcoord);

+            if (inst->TexSrcTarget != TEXTURE_CUBE_INDEX &&

+                texcoord[3] != 0.0) {

+               texcoord[0] /= texcoord[3];

+               texcoord[1] /= texcoord[3];

+               texcoord[2] /= texcoord[3];

+            }

+

+            fetch_texel(ctx, machine, inst, texcoord, 0.0, color);

+

+            store_vector4(inst, machine, color);

+         }

+         break;

+      case OPCODE_TRUNC:       /* truncate toward zero */

+         {

+            GLfloat a[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            result[0] = (GLfloat) (GLint) a[0];

+            result[1] = (GLfloat) (GLint) a[1];

+            result[2] = (GLfloat) (GLint) a[2];

+            result[3] = (GLfloat) (GLint) a[3];

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_UP2H:        /* unpack two 16-bit floats */

+         {

+            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);

+            GLfloat result[4];

+            GLushort hx, hy;

+            hx = raw & 0xffff;

+            hy = raw >> 16;

+            result[0] = result[2] = _mesa_half_to_float(hx);

+            result[1] = result[3] = _mesa_half_to_float(hy);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_UP2US:       /* unpack two GLushorts */

+         {

+            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);

+            GLfloat result[4];

+            GLushort usx, usy;

+            usx = raw & 0xffff;

+            usy = raw >> 16;

+            result[0] = result[2] = usx * (1.0f / 65535.0f);

+            result[1] = result[3] = usy * (1.0f / 65535.0f);

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_UP4B:        /* unpack four GLbytes */

+         {

+            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);

+            GLfloat result[4];

+            result[0] = (((raw >> 0) & 0xff) - 128) / 127.0F;

+            result[1] = (((raw >> 8) & 0xff) - 128) / 127.0F;

+            result[2] = (((raw >> 16) & 0xff) - 128) / 127.0F;

+            result[3] = (((raw >> 24) & 0xff) - 128) / 127.0F;

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_UP4UB:       /* unpack four GLubytes */

+         {

+            const GLuint raw = fetch_vector1ui(&inst->SrcReg[0], machine);

+            GLfloat result[4];

+            result[0] = ((raw >> 0) & 0xff) / 255.0F;

+            result[1] = ((raw >> 8) & 0xff) / 255.0F;

+            result[2] = ((raw >> 16) & 0xff) / 255.0F;

+            result[3] = ((raw >> 24) & 0xff) / 255.0F;

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_XOR:         /* bitwise XOR */

+         {

+            GLuint a[4], b[4], result[4];

+            fetch_vector4ui(&inst->SrcReg[0], machine, a);

+            fetch_vector4ui(&inst->SrcReg[1], machine, b);

+            result[0] = a[0] ^ b[0];

+            result[1] = a[1] ^ b[1];

+            result[2] = a[2] ^ b[2];

+            result[3] = a[3] ^ b[3];

+            store_vector4ui(inst, machine, result);

+         }

+         break;

+      case OPCODE_XPD:         /* cross product */

+         {

+            GLfloat a[4], b[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            result[0] = a[1] * b[2] - a[2] * b[1];

+            result[1] = a[2] * b[0] - a[0] * b[2];

+            result[2] = a[0] * b[1] - a[1] * b[0];

+            result[3] = 1.0;

+            store_vector4(inst, machine, result);

+            if (DEBUG_PROG) {

+               printf("XPD (%g %g %g %g) = (%g %g %g) X (%g %g %g)\n",

+                      result[0], result[1], result[2], result[3],

+                      a[0], a[1], a[2], b[0], b[1], b[2]);

+            }

+         }

+         break;

+      case OPCODE_X2D:         /* 2-D matrix transform */

+         {

+            GLfloat a[4], b[4], c[4], result[4];

+            fetch_vector4(&inst->SrcReg[0], machine, a);

+            fetch_vector4(&inst->SrcReg[1], machine, b);

+            fetch_vector4(&inst->SrcReg[2], machine, c);

+            result[0] = a[0] + b[0] * c[0] + b[1] * c[1];

+            result[1] = a[1] + b[0] * c[2] + b[1] * c[3];

+            result[2] = a[2] + b[0] * c[0] + b[1] * c[1];

+            result[3] = a[3] + b[0] * c[2] + b[1] * c[3];

+            store_vector4(inst, machine, result);

+         }

+         break;

+      case OPCODE_PRINT:

+         {

+            if (inst->SrcReg[0].File != PROGRAM_UNDEFINED) {

+               GLfloat a[4];

+               fetch_vector4(&inst->SrcReg[0], machine, a);

+               printf("%s%g, %g, %g, %g\n", (const char *) inst->Data,

+                            a[0], a[1], a[2], a[3]);

+            }

+            else {

+               printf("%s\n", (const char *) inst->Data);

+            }

+         }

+         break;

+      case OPCODE_END:

+         return GL_TRUE;

+      default:

+         _mesa_problem(ctx, "Bad opcode %d in _mesa_execute_program",

+                       inst->Opcode);

+         return GL_TRUE;        /* return value doesn't matter */

+      }

+

+      numExec++;

+      if (numExec > maxExec) {

+	 static GLboolean reported = GL_FALSE;

+	 if (!reported) {

+	    _mesa_problem(ctx, "Infinite loop detected in fragment program");

+	    reported = GL_TRUE;

+	 }

+         return GL_TRUE;

+      }

+

+   } /* for pc */

+

+   return GL_TRUE;

+}