svn merge ^/branches/released . --username marha

1 files changed, 1757 insertions, 0 deletions

diff --git a/mesalib/src/mesa/shader/prog_execute.c b/mesalib/src/mesa/shader/prog_execute.c
new file mode 100644
index 000000000..69b81e724
--- /dev/null
+++ b/mesalib/src/mesa/shader/prog_execute.c
@@ -0,0 +1,1757 @@
+/*
+ * 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/context.h"
+#include "program.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)  ( *((GLuint *) (void *)&x) = 0x7F800000 )
+#define SET_NEG_INFINITY(x)  ( *((GLuint *) (void *)&x) = 0xFF800000 )
+#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 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];
+   }
+}
+
+
+/**
+ * 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(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
+   }
+}
+
+
+
+/**
+ * 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]);
+         }
+         break;
+      case OPCODE_BGNLOOP:
+         /* no-op */
+         break;
+      case OPCODE_ENDLOOP:
+         /* subtract 1 here since pc is incremented by for(pc) loop */
+         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) */
+         /* fall-through */
+      case OPCODE_BRK:         /* break out of loop (conditional) */
+         /* fall-through */
+      case OPCODE_CONT:        /* continue loop (conditional) */
+         if (eval_condition(machine, inst)) {
+            /* take branch */
+            /* 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);
+         }
+         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) _mesa_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) _mesa_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) _mesa_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;
+            /* 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 - 1;
+            }
+         }
+         break;
+      case OPCODE_ELSE:
+         /* goto ENDIF */
+         assert(inst->BranchTarget >= 0);
+         pc = inst->BranchTarget - 1;
+         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 = 0.0F;
+            }
+            else {
+               val = 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] = 1.0;
+               else
+                  result[2] = (GLfloat) _mesa_pow(a[1], a[3]);
+            }
+            else {
+               result[2] = 0.0;
+            }
+            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] = (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) _mesa_pow(a[0], b[0]);
+            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) _mesa_cos(a[0]);
+            result[1] = (GLfloat) _mesa_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) _mesa_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_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 */
+         {
+            GLfloat a[4], result[4];
+            const GLuint *rawBits = (const GLuint *) a;
+            GLhalfNV hx, hy;
+            fetch_vector1(&inst->SrcReg[0], machine, a);
+            hx = rawBits[0] & 0xffff;
+            hy = rawBits[0] >> 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 */
+         {
+            GLfloat a[4], result[4];
+            const GLuint *rawBits = (const GLuint *) a;
+            GLushort usx, usy;
+            fetch_vector1(&inst->SrcReg[0], machine, a);
+            usx = rawBits[0] & 0xffff;
+            usy = rawBits[0] >> 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 */
+         {
+            GLfloat a[4], result[4];
+            const GLuint *rawBits = (const GLuint *) a;
+            fetch_vector1(&inst->SrcReg[0], machine, a);
+            result[0] = (((rawBits[0] >> 0) & 0xff) - 128) / 127.0F;
+            result[1] = (((rawBits[0] >> 8) & 0xff) - 128) / 127.0F;
+            result[2] = (((rawBits[0] >> 16) & 0xff) - 128) / 127.0F;
+            result[3] = (((rawBits[0] >> 24) & 0xff) - 128) / 127.0F;
+            store_vector4(inst, machine, result);
+         }
+         break;
+      case OPCODE_UP4UB:       /* unpack four GLubytes */
+         {
+            GLfloat a[4], result[4];
+            const GLuint *rawBits = (const GLuint *) a;
+            fetch_vector1(&inst->SrcReg[0], machine, a);
+            result[0] = ((rawBits[0] >> 0) & 0xff) / 255.0F;
+            result[1] = ((rawBits[0] >> 8) & 0xff) / 255.0F;
+            result[2] = ((rawBits[0] >> 16) & 0xff) / 255.0F;
+            result[3] = ((rawBits[0] >> 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 != -1) {
+               GLfloat a[4];
+               fetch_vector4(&inst->SrcReg[0], machine, a);
+               _mesa_printf("%s%g, %g, %g, %g\n", (const char *) inst->Data,
+                            a[0], a[1], a[2], a[3]);
+            }
+            else {
+               _mesa_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) {
+         _mesa_problem(ctx, "Infinite loop detected in fragment program");
+         return GL_TRUE;
+      }
+
+   } /* for pc */
+
+   return GL_TRUE;
+}