xserver and mesa git update 28-12-2010

1 files changed, 669 insertions, 669 deletions

diff --git a/mesalib/src/mesa/program/programopt.c b/mesalib/src/mesa/program/programopt.c
index fb2ebe633..6601f7416 100644
--- a/mesalib/src/mesa/program/programopt.c
+++ b/mesalib/src/mesa/program/programopt.c
@@ -1,669 +1,669 @@
-/*
- * Mesa 3-D graphics library
- * Version:  6.5.3
- *
- * Copyright (C) 1999-2007  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  programopt.c 
- * Vertex/Fragment program optimizations and transformations for program
- * options, etc.
- *
- * \author Brian Paul
- */
-
-
-#include "main/glheader.h"
-#include "main/context.h"
-#include "prog_parameter.h"
-#include "prog_statevars.h"
-#include "program.h"
-#include "programopt.h"
-#include "prog_instruction.h"
-
-
-/**
- * This function inserts instructions for coordinate modelview * projection
- * into a vertex program.
- * May be used to implement the position_invariant option.
- */
-static void
-_mesa_insert_mvp_dp4_code(GLcontext *ctx, struct gl_vertex_program *vprog)
-{
-   struct prog_instruction *newInst;
-   const GLuint origLen = vprog->Base.NumInstructions;
-   const GLuint newLen = origLen + 4;
-   GLuint i;
-
-   /*
-    * Setup state references for the modelview/projection matrix.
-    * XXX we should check if these state vars are already declared.
-    */
-   static const gl_state_index mvpState[4][STATE_LENGTH] = {
-      { STATE_MVP_MATRIX, 0, 0, 0, 0 },  /* state.matrix.mvp.row[0] */
-      { STATE_MVP_MATRIX, 0, 1, 1, 0 },  /* state.matrix.mvp.row[1] */
-      { STATE_MVP_MATRIX, 0, 2, 2, 0 },  /* state.matrix.mvp.row[2] */
-      { STATE_MVP_MATRIX, 0, 3, 3, 0 },  /* state.matrix.mvp.row[3] */
-   };
-   GLint mvpRef[4];
-
-   for (i = 0; i < 4; i++) {
-      mvpRef[i] = _mesa_add_state_reference(vprog->Base.Parameters,
-                                            mvpState[i]);
-   }
-
-   /* Alloc storage for new instructions */
-   newInst = _mesa_alloc_instructions(newLen);
-   if (!newInst) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY,
-                  "glProgramString(inserting position_invariant code)");
-      return;
-   }
-
-   /*
-    * Generated instructions:
-    * newInst[0] = DP4 result.position.x, mvp.row[0], vertex.position;
-    * newInst[1] = DP4 result.position.y, mvp.row[1], vertex.position;
-    * newInst[2] = DP4 result.position.z, mvp.row[2], vertex.position;
-    * newInst[3] = DP4 result.position.w, mvp.row[3], vertex.position;
-    */
-   _mesa_init_instructions(newInst, 4);
-   for (i = 0; i < 4; i++) {
-      newInst[i].Opcode = OPCODE_DP4;
-      newInst[i].DstReg.File = PROGRAM_OUTPUT;
-      newInst[i].DstReg.Index = VERT_RESULT_HPOS;
-      newInst[i].DstReg.WriteMask = (WRITEMASK_X << i);
-      newInst[i].SrcReg[0].File = PROGRAM_STATE_VAR;
-      newInst[i].SrcReg[0].Index = mvpRef[i];
-      newInst[i].SrcReg[0].Swizzle = SWIZZLE_NOOP;
-      newInst[i].SrcReg[1].File = PROGRAM_INPUT;
-      newInst[i].SrcReg[1].Index = VERT_ATTRIB_POS;
-      newInst[i].SrcReg[1].Swizzle = SWIZZLE_NOOP;
-   }
-
-   /* Append original instructions after new instructions */
-   _mesa_copy_instructions (newInst + 4, vprog->Base.Instructions, origLen);
-
-   /* free old instructions */
-   _mesa_free_instructions(vprog->Base.Instructions, origLen);
-
-   /* install new instructions */
-   vprog->Base.Instructions = newInst;
-   vprog->Base.NumInstructions = newLen;
-   vprog->Base.InputsRead |= VERT_BIT_POS;
-   vprog->Base.OutputsWritten |= BITFIELD64_BIT(VERT_RESULT_HPOS);
-}
-
-
-static void
-_mesa_insert_mvp_mad_code(GLcontext *ctx, struct gl_vertex_program *vprog)
-{
-   struct prog_instruction *newInst;
-   const GLuint origLen = vprog->Base.NumInstructions;
-   const GLuint newLen = origLen + 4;
-   GLuint hposTemp;
-   GLuint i;
-
-   /*
-    * Setup state references for the modelview/projection matrix.
-    * XXX we should check if these state vars are already declared.
-    */
-   static const gl_state_index mvpState[4][STATE_LENGTH] = {
-      { STATE_MVP_MATRIX, 0, 0, 0, STATE_MATRIX_TRANSPOSE },
-      { STATE_MVP_MATRIX, 0, 1, 1, STATE_MATRIX_TRANSPOSE },
-      { STATE_MVP_MATRIX, 0, 2, 2, STATE_MATRIX_TRANSPOSE },
-      { STATE_MVP_MATRIX, 0, 3, 3, STATE_MATRIX_TRANSPOSE },
-   };
-   GLint mvpRef[4];
-
-   for (i = 0; i < 4; i++) {
-      mvpRef[i] = _mesa_add_state_reference(vprog->Base.Parameters,
-                                            mvpState[i]);
-   }
-
-   /* Alloc storage for new instructions */
-   newInst = _mesa_alloc_instructions(newLen);
-   if (!newInst) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY,
-                  "glProgramString(inserting position_invariant code)");
-      return;
-   }
-
-   /* TEMP hposTemp; */
-   hposTemp = vprog->Base.NumTemporaries++;
-
-   /*
-    * Generated instructions:
-    *    emit_op2(p, OPCODE_MUL, tmp, 0, swizzle1(src,X), mat[0]);
-    *    emit_op3(p, OPCODE_MAD, tmp, 0, swizzle1(src,Y), mat[1], tmp);
-    *    emit_op3(p, OPCODE_MAD, tmp, 0, swizzle1(src,Z), mat[2], tmp);
-    *    emit_op3(p, OPCODE_MAD, dest, 0, swizzle1(src,W), mat[3], tmp);
-    */
-   _mesa_init_instructions(newInst, 4);
-
-   newInst[0].Opcode = OPCODE_MUL;
-   newInst[0].DstReg.File = PROGRAM_TEMPORARY;
-   newInst[0].DstReg.Index = hposTemp;
-   newInst[0].DstReg.WriteMask = WRITEMASK_XYZW;
-   newInst[0].SrcReg[0].File = PROGRAM_INPUT;
-   newInst[0].SrcReg[0].Index = VERT_ATTRIB_POS;
-   newInst[0].SrcReg[0].Swizzle = SWIZZLE_XXXX;
-   newInst[0].SrcReg[1].File = PROGRAM_STATE_VAR;
-   newInst[0].SrcReg[1].Index = mvpRef[0];
-   newInst[0].SrcReg[1].Swizzle = SWIZZLE_NOOP;
-
-   for (i = 1; i <= 2; i++) {
-      newInst[i].Opcode = OPCODE_MAD;
-      newInst[i].DstReg.File = PROGRAM_TEMPORARY;
-      newInst[i].DstReg.Index = hposTemp;
-      newInst[i].DstReg.WriteMask = WRITEMASK_XYZW;
-      newInst[i].SrcReg[0].File = PROGRAM_INPUT;
-      newInst[i].SrcReg[0].Index = VERT_ATTRIB_POS;
-      newInst[i].SrcReg[0].Swizzle = MAKE_SWIZZLE4(i,i,i,i);
-      newInst[i].SrcReg[1].File = PROGRAM_STATE_VAR;
-      newInst[i].SrcReg[1].Index = mvpRef[i];
-      newInst[i].SrcReg[1].Swizzle = SWIZZLE_NOOP;
-      newInst[i].SrcReg[2].File = PROGRAM_TEMPORARY;
-      newInst[i].SrcReg[2].Index = hposTemp;
-      newInst[1].SrcReg[2].Swizzle = SWIZZLE_NOOP;
-   }
-
-   newInst[3].Opcode = OPCODE_MAD;
-   newInst[3].DstReg.File = PROGRAM_OUTPUT;
-   newInst[3].DstReg.Index = VERT_RESULT_HPOS;
-   newInst[3].DstReg.WriteMask = WRITEMASK_XYZW;
-   newInst[3].SrcReg[0].File = PROGRAM_INPUT;
-   newInst[3].SrcReg[0].Index = VERT_ATTRIB_POS;
-   newInst[3].SrcReg[0].Swizzle = SWIZZLE_WWWW;
-   newInst[3].SrcReg[1].File = PROGRAM_STATE_VAR;
-   newInst[3].SrcReg[1].Index = mvpRef[3];
-   newInst[3].SrcReg[1].Swizzle = SWIZZLE_NOOP;
-   newInst[3].SrcReg[2].File = PROGRAM_TEMPORARY;
-   newInst[3].SrcReg[2].Index = hposTemp;
-   newInst[3].SrcReg[2].Swizzle = SWIZZLE_NOOP;
-
-
-   /* Append original instructions after new instructions */
-   _mesa_copy_instructions (newInst + 4, vprog->Base.Instructions, origLen);
-
-   /* free old instructions */
-   _mesa_free_instructions(vprog->Base.Instructions, origLen);
-
-   /* install new instructions */
-   vprog->Base.Instructions = newInst;
-   vprog->Base.NumInstructions = newLen;
-   vprog->Base.InputsRead |= VERT_BIT_POS;
-   vprog->Base.OutputsWritten |= BITFIELD64_BIT(VERT_RESULT_HPOS);
-}
-
-
-void
-_mesa_insert_mvp_code(GLcontext *ctx, struct gl_vertex_program *vprog)
-{
-   if (ctx->mvp_with_dp4) 
-      _mesa_insert_mvp_dp4_code( ctx, vprog );
-   else
-      _mesa_insert_mvp_mad_code( ctx, vprog );
-}
-      
-
-
-
-
-
-/**
- * Append extra instructions onto the given fragment program to implement
- * the fog mode specified by fprog->FogOption.
- * The fragment.fogcoord input is used to compute the fog blend factor.
- *
- * XXX with a little work, this function could be adapted to add fog code
- * to vertex programs too.
- */
-void
-_mesa_append_fog_code(GLcontext *ctx, struct gl_fragment_program *fprog)
-{
-   static const gl_state_index fogPStateOpt[STATE_LENGTH]
-      = { STATE_INTERNAL, STATE_FOG_PARAMS_OPTIMIZED, 0, 0, 0 };
-   static const gl_state_index fogColorState[STATE_LENGTH]
-      = { STATE_FOG_COLOR, 0, 0, 0, 0};
-   struct prog_instruction *newInst, *inst;
-   const GLuint origLen = fprog->Base.NumInstructions;
-   const GLuint newLen = origLen + 5;
-   GLuint i;
-   GLint fogPRefOpt, fogColorRef; /* state references */
-   GLuint colorTemp, fogFactorTemp; /* temporary registerss */
-
-   if (fprog->FogOption == GL_NONE) {
-      _mesa_problem(ctx, "_mesa_append_fog_code() called for fragment program"
-                    " with FogOption == GL_NONE");
-      return;
-   }
-
-   /* Alloc storage for new instructions */
-   newInst = _mesa_alloc_instructions(newLen);
-   if (!newInst) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY,
-                  "glProgramString(inserting fog_option code)");
-      return;
-   }
-
-   /* Copy orig instructions into new instruction buffer */
-   _mesa_copy_instructions(newInst, fprog->Base.Instructions, origLen);
-
-   /* PARAM fogParamsRefOpt = internal optimized fog params; */
-   fogPRefOpt
-      = _mesa_add_state_reference(fprog->Base.Parameters, fogPStateOpt);
-   /* PARAM fogColorRef = state.fog.color; */
-   fogColorRef
-      = _mesa_add_state_reference(fprog->Base.Parameters, fogColorState);
-
-   /* TEMP colorTemp; */
-   colorTemp = fprog->Base.NumTemporaries++;
-   /* TEMP fogFactorTemp; */
-   fogFactorTemp = fprog->Base.NumTemporaries++;
-
-   /* Scan program to find where result.color is written */
-   inst = newInst;
-   for (i = 0; i < fprog->Base.NumInstructions; i++) {
-      if (inst->Opcode == OPCODE_END)
-         break;
-      if (inst->DstReg.File == PROGRAM_OUTPUT &&
-          inst->DstReg.Index == FRAG_RESULT_COLOR) {
-         /* change the instruction to write to colorTemp w/ clamping */
-         inst->DstReg.File = PROGRAM_TEMPORARY;
-         inst->DstReg.Index = colorTemp;
-         inst->SaturateMode = SATURATE_ZERO_ONE;
-         /* don't break (may be several writes to result.color) */
-      }
-      inst++;
-   }
-   assert(inst->Opcode == OPCODE_END); /* we'll overwrite this inst */
-
-   _mesa_init_instructions(inst, 5);
-
-   /* emit instructions to compute fog blending factor */
-   if (fprog->FogOption == GL_LINEAR) {
-      /* MAD fogFactorTemp.x, fragment.fogcoord.x, fogPRefOpt.x, fogPRefOpt.y; */
-      inst->Opcode = OPCODE_MAD;
-      inst->DstReg.File = PROGRAM_TEMPORARY;
-      inst->DstReg.Index = fogFactorTemp;
-      inst->DstReg.WriteMask = WRITEMASK_X;
-      inst->SrcReg[0].File = PROGRAM_INPUT;
-      inst->SrcReg[0].Index = FRAG_ATTRIB_FOGC;
-      inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;
-      inst->SrcReg[1].File = PROGRAM_STATE_VAR;
-      inst->SrcReg[1].Index = fogPRefOpt;
-      inst->SrcReg[1].Swizzle = SWIZZLE_XXXX;
-      inst->SrcReg[2].File = PROGRAM_STATE_VAR;
-      inst->SrcReg[2].Index = fogPRefOpt;
-      inst->SrcReg[2].Swizzle = SWIZZLE_YYYY;
-      inst->SaturateMode = SATURATE_ZERO_ONE;
-      inst++;
-   }
-   else {
-      ASSERT(fprog->FogOption == GL_EXP || fprog->FogOption == GL_EXP2);
-      /* fogPRefOpt.z = d/ln(2), fogPRefOpt.w = d/sqrt(ln(2) */
-      /* EXP: MUL fogFactorTemp.x, fogPRefOpt.z, fragment.fogcoord.x; */
-      /* EXP2: MUL fogFactorTemp.x, fogPRefOpt.w, fragment.fogcoord.x; */
-      inst->Opcode = OPCODE_MUL;
-      inst->DstReg.File = PROGRAM_TEMPORARY;
-      inst->DstReg.Index = fogFactorTemp;
-      inst->DstReg.WriteMask = WRITEMASK_X;
-      inst->SrcReg[0].File = PROGRAM_STATE_VAR;
-      inst->SrcReg[0].Index = fogPRefOpt;
-      inst->SrcReg[0].Swizzle
-         = (fprog->FogOption == GL_EXP) ? SWIZZLE_ZZZZ : SWIZZLE_WWWW;
-      inst->SrcReg[1].File = PROGRAM_INPUT;
-      inst->SrcReg[1].Index = FRAG_ATTRIB_FOGC;
-      inst->SrcReg[1].Swizzle = SWIZZLE_XXXX;
-      inst++;
-      if (fprog->FogOption == GL_EXP2) {
-         /* MUL fogFactorTemp.x, fogFactorTemp.x, fogFactorTemp.x; */
-         inst->Opcode = OPCODE_MUL;
-         inst->DstReg.File = PROGRAM_TEMPORARY;
-         inst->DstReg.Index = fogFactorTemp;
-         inst->DstReg.WriteMask = WRITEMASK_X;
-         inst->SrcReg[0].File = PROGRAM_TEMPORARY;
-         inst->SrcReg[0].Index = fogFactorTemp;
-         inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;
-         inst->SrcReg[1].File = PROGRAM_TEMPORARY;
-         inst->SrcReg[1].Index = fogFactorTemp;
-         inst->SrcReg[1].Swizzle = SWIZZLE_XXXX;
-         inst++;
-      }
-      /* EX2_SAT fogFactorTemp.x, -fogFactorTemp.x; */
-      inst->Opcode = OPCODE_EX2;
-      inst->DstReg.File = PROGRAM_TEMPORARY;
-      inst->DstReg.Index = fogFactorTemp;
-      inst->DstReg.WriteMask = WRITEMASK_X;
-      inst->SrcReg[0].File = PROGRAM_TEMPORARY;
-      inst->SrcReg[0].Index = fogFactorTemp;
-      inst->SrcReg[0].Negate = NEGATE_XYZW;
-      inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;
-      inst->SaturateMode = SATURATE_ZERO_ONE;
-      inst++;
-   }
-   /* LRP result.color.xyz, fogFactorTemp.xxxx, colorTemp, fogColorRef; */
-   inst->Opcode = OPCODE_LRP;
-   inst->DstReg.File = PROGRAM_OUTPUT;
-   inst->DstReg.Index = FRAG_RESULT_COLOR;
-   inst->DstReg.WriteMask = WRITEMASK_XYZ;
-   inst->SrcReg[0].File = PROGRAM_TEMPORARY;
-   inst->SrcReg[0].Index = fogFactorTemp;
-   inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;
-   inst->SrcReg[1].File = PROGRAM_TEMPORARY;
-   inst->SrcReg[1].Index = colorTemp;
-   inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
-   inst->SrcReg[2].File = PROGRAM_STATE_VAR;
-   inst->SrcReg[2].Index = fogColorRef;
-   inst->SrcReg[2].Swizzle = SWIZZLE_NOOP;
-   inst++;
-   /* MOV result.color.w, colorTemp.x;  # copy alpha */
-   inst->Opcode = OPCODE_MOV;
-   inst->DstReg.File = PROGRAM_OUTPUT;
-   inst->DstReg.Index = FRAG_RESULT_COLOR;
-   inst->DstReg.WriteMask = WRITEMASK_W;
-   inst->SrcReg[0].File = PROGRAM_TEMPORARY;
-   inst->SrcReg[0].Index = colorTemp;
-   inst->SrcReg[0].Swizzle = SWIZZLE_NOOP;
-   inst++;
-   /* END; */
-   inst->Opcode = OPCODE_END;
-   inst++;
-
-   /* free old instructions */
-   _mesa_free_instructions(fprog->Base.Instructions, origLen);
-
-   /* install new instructions */
-   fprog->Base.Instructions = newInst;
-   fprog->Base.NumInstructions = inst - newInst;
-   fprog->Base.InputsRead |= FRAG_BIT_FOGC;
-   /* XXX do this?  fprog->FogOption = GL_NONE; */
-}
-
-
-
-static GLboolean
-is_texture_instruction(const struct prog_instruction *inst)
-{
-   switch (inst->Opcode) {
-   case OPCODE_TEX:
-   case OPCODE_TXB:
-   case OPCODE_TXD:
-   case OPCODE_TXL:
-   case OPCODE_TXP:
-   case OPCODE_TXP_NV:
-      return GL_TRUE;
-   default:
-      return GL_FALSE;
-   }
-}
-      
-
-/**
- * Count the number of texure indirections in the given program.
- * The program's NumTexIndirections field will be updated.
- * See the GL_ARB_fragment_program spec (issue 24) for details.
- * XXX we count texture indirections in texenvprogram.c (maybe use this code
- * instead and elsewhere).
- */
-void
-_mesa_count_texture_indirections(struct gl_program *prog)
-{
-   GLuint indirections = 1;
-   GLbitfield tempsOutput = 0x0;
-   GLbitfield aluTemps = 0x0;
-   GLuint i;
-
-   for (i = 0; i < prog->NumInstructions; i++) {
-      const struct prog_instruction *inst = prog->Instructions + i;
-
-      if (is_texture_instruction(inst)) {
-         if (((inst->SrcReg[0].File == PROGRAM_TEMPORARY) && 
-              (tempsOutput & (1 << inst->SrcReg[0].Index))) ||
-             ((inst->Opcode != OPCODE_KIL) &&
-              (inst->DstReg.File == PROGRAM_TEMPORARY) && 
-              (aluTemps & (1 << inst->DstReg.Index)))) 
-            {
-               indirections++;
-               tempsOutput = 0x0;
-               aluTemps = 0x0;
-            }
-      }
-      else {
-         GLuint j;
-         for (j = 0; j < 3; j++) {
-            if (inst->SrcReg[j].File == PROGRAM_TEMPORARY)
-               aluTemps |= (1 << inst->SrcReg[j].Index);
-         }
-         if (inst->DstReg.File == PROGRAM_TEMPORARY)
-            aluTemps |= (1 << inst->DstReg.Index);
-      }
-
-      if ((inst->Opcode != OPCODE_KIL) && (inst->DstReg.File == PROGRAM_TEMPORARY))
-         tempsOutput |= (1 << inst->DstReg.Index);
-   }
-
-   prog->NumTexIndirections = indirections;
-}
-
-
-/**
- * Count number of texture instructions in given program and update the
- * program's NumTexInstructions field.
- */
-void
-_mesa_count_texture_instructions(struct gl_program *prog)
-{
-   GLuint i;
-   prog->NumTexInstructions = 0;
-   for (i = 0; i < prog->NumInstructions; i++) {
-      prog->NumTexInstructions += is_texture_instruction(prog->Instructions + i);
-   }
-}
-
-
-/**
- * Scan/rewrite program to remove reads of custom (output) registers.
- * The passed type has to be either PROGRAM_OUTPUT or PROGRAM_VARYING
- * (for vertex shaders).
- * In GLSL shaders, varying vars can be read and written.
- * On some hardware, trying to read an output register causes trouble.
- * So, rewrite the program to use a temporary register in this case.
- */
-void
-_mesa_remove_output_reads(struct gl_program *prog, gl_register_file type)
-{
-   GLuint i;
-   GLint outputMap[VERT_RESULT_MAX];
-   GLuint numVaryingReads = 0;
-   GLboolean usedTemps[MAX_PROGRAM_TEMPS];
-   GLuint firstTemp = 0;
-
-   _mesa_find_used_registers(prog, PROGRAM_TEMPORARY,
-                             usedTemps, MAX_PROGRAM_TEMPS);
-
-   assert(type == PROGRAM_VARYING || type == PROGRAM_OUTPUT);
-   assert(prog->Target == GL_VERTEX_PROGRAM_ARB || type != PROGRAM_VARYING);
-
-   for (i = 0; i < VERT_RESULT_MAX; i++)
-      outputMap[i] = -1;
-
-   /* look for instructions which read from varying vars */
-   for (i = 0; i < prog->NumInstructions; i++) {
-      struct prog_instruction *inst = prog->Instructions + i;
-      const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode);
-      GLuint j;
-      for (j = 0; j < numSrc; j++) {
-         if (inst->SrcReg[j].File == type) {
-            /* replace the read with a temp reg */
-            const GLuint var = inst->SrcReg[j].Index;
-            if (outputMap[var] == -1) {
-               numVaryingReads++;
-               outputMap[var] = _mesa_find_free_register(usedTemps,
-                                                         MAX_PROGRAM_TEMPS,
-                                                         firstTemp);
-               firstTemp = outputMap[var] + 1;
-            }
-            inst->SrcReg[j].File = PROGRAM_TEMPORARY;
-            inst->SrcReg[j].Index = outputMap[var];
-         }
-      }
-   }
-
-   if (numVaryingReads == 0)
-      return; /* nothing to be done */
-
-   /* look for instructions which write to the varying vars identified above */
-   for (i = 0; i < prog->NumInstructions; i++) {
-      struct prog_instruction *inst = prog->Instructions + i;
-      if (inst->DstReg.File == type &&
-          outputMap[inst->DstReg.Index] >= 0) {
-         /* change inst to write to the temp reg, instead of the varying */
-         inst->DstReg.File = PROGRAM_TEMPORARY;
-         inst->DstReg.Index = outputMap[inst->DstReg.Index];
-      }
-   }
-
-   /* insert new instructions to copy the temp vars to the varying vars */
-   {
-      struct prog_instruction *inst;
-      GLint endPos, var;
-
-      /* Look for END instruction and insert the new varying writes */
-      endPos = -1;
-      for (i = 0; i < prog->NumInstructions; i++) {
-         struct prog_instruction *inst = prog->Instructions + i;
-         if (inst->Opcode == OPCODE_END) {
-            endPos = i;
-            _mesa_insert_instructions(prog, i, numVaryingReads);
-            break;
-         }
-      }
-
-      assert(endPos >= 0);
-
-      /* insert new MOV instructions here */
-      inst = prog->Instructions + endPos;
-      for (var = 0; var < VERT_RESULT_MAX; var++) {
-         if (outputMap[var] >= 0) {
-            /* MOV VAR[var], TEMP[tmp]; */
-            inst->Opcode = OPCODE_MOV;
-            inst->DstReg.File = type;
-            inst->DstReg.Index = var;
-            inst->SrcReg[0].File = PROGRAM_TEMPORARY;
-            inst->SrcReg[0].Index = outputMap[var];
-            inst++;
-         }
-      }
-   }
-}
-
-
-/**
- * Make the given fragment program into a "no-op" shader.
- * Actually, just copy the incoming fragment color (or texcoord)
- * to the output color.
- * This is for debug/test purposes.
- */
-void
-_mesa_nop_fragment_program(GLcontext *ctx, struct gl_fragment_program *prog)
-{
-   struct prog_instruction *inst;
-   GLuint inputAttr;
-
-   inst = _mesa_alloc_instructions(2);
-   if (!inst) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "_mesa_nop_fragment_program");
-      return;
-   }
-
-   _mesa_init_instructions(inst, 2);
-
-   inst[0].Opcode = OPCODE_MOV;
-   inst[0].DstReg.File = PROGRAM_OUTPUT;
-   inst[0].DstReg.Index = FRAG_RESULT_COLOR;
-   inst[0].SrcReg[0].File = PROGRAM_INPUT;
-   if (prog->Base.InputsRead & FRAG_BIT_COL0)
-      inputAttr = FRAG_ATTRIB_COL0;
-   else
-      inputAttr = FRAG_ATTRIB_TEX0;
-   inst[0].SrcReg[0].Index = inputAttr;
-
-   inst[1].Opcode = OPCODE_END;
-
-   _mesa_free_instructions(prog->Base.Instructions,
-                           prog->Base.NumInstructions);
-
-   prog->Base.Instructions = inst;
-   prog->Base.NumInstructions = 2;
-   prog->Base.InputsRead = 1 << inputAttr;
-   prog->Base.OutputsWritten = BITFIELD64_BIT(FRAG_RESULT_COLOR);
-}
-
-
-/**
- * \sa _mesa_nop_fragment_program
- * Replace the given vertex program with a "no-op" program that just
- * transforms vertex position and emits color.
- */
-void
-_mesa_nop_vertex_program(GLcontext *ctx, struct gl_vertex_program *prog)
-{
-   struct prog_instruction *inst;
-   GLuint inputAttr;
-
-   /*
-    * Start with a simple vertex program that emits color.
-    */
-   inst = _mesa_alloc_instructions(2);
-   if (!inst) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "_mesa_nop_vertex_program");
-      return;
-   }
-
-   _mesa_init_instructions(inst, 2);
-
-   inst[0].Opcode = OPCODE_MOV;
-   inst[0].DstReg.File = PROGRAM_OUTPUT;
-   inst[0].DstReg.Index = VERT_RESULT_COL0;
-   inst[0].SrcReg[0].File = PROGRAM_INPUT;
-   if (prog->Base.InputsRead & VERT_BIT_COLOR0)
-      inputAttr = VERT_ATTRIB_COLOR0;
-   else
-      inputAttr = VERT_ATTRIB_TEX0;
-   inst[0].SrcReg[0].Index = inputAttr;
-
-   inst[1].Opcode = OPCODE_END;
-
-   _mesa_free_instructions(prog->Base.Instructions,
-                           prog->Base.NumInstructions);
-
-   prog->Base.Instructions = inst;
-   prog->Base.NumInstructions = 2;
-   prog->Base.InputsRead = 1 << inputAttr;
-   prog->Base.OutputsWritten = BITFIELD64_BIT(VERT_RESULT_COL0);
-
-   /*
-    * Now insert code to do standard modelview/projection transformation.
-    */
-   _mesa_insert_mvp_code(ctx, prog);
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  6.5.3

+ *

+ * Copyright (C) 1999-2007  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  programopt.c 

+ * Vertex/Fragment program optimizations and transformations for program

+ * options, etc.

+ *

+ * \author Brian Paul

+ */

+

+

+#include "main/glheader.h"

+#include "main/context.h"

+#include "prog_parameter.h"

+#include "prog_statevars.h"

+#include "program.h"

+#include "programopt.h"

+#include "prog_instruction.h"

+

+

+/**

+ * This function inserts instructions for coordinate modelview * projection

+ * into a vertex program.

+ * May be used to implement the position_invariant option.

+ */

+static void

+_mesa_insert_mvp_dp4_code(struct gl_context *ctx, struct gl_vertex_program *vprog)

+{

+   struct prog_instruction *newInst;

+   const GLuint origLen = vprog->Base.NumInstructions;

+   const GLuint newLen = origLen + 4;

+   GLuint i;

+

+   /*

+    * Setup state references for the modelview/projection matrix.

+    * XXX we should check if these state vars are already declared.

+    */

+   static const gl_state_index mvpState[4][STATE_LENGTH] = {

+      { STATE_MVP_MATRIX, 0, 0, 0, 0 },  /* state.matrix.mvp.row[0] */

+      { STATE_MVP_MATRIX, 0, 1, 1, 0 },  /* state.matrix.mvp.row[1] */

+      { STATE_MVP_MATRIX, 0, 2, 2, 0 },  /* state.matrix.mvp.row[2] */

+      { STATE_MVP_MATRIX, 0, 3, 3, 0 },  /* state.matrix.mvp.row[3] */

+   };

+   GLint mvpRef[4];

+

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

+      mvpRef[i] = _mesa_add_state_reference(vprog->Base.Parameters,

+                                            mvpState[i]);

+   }

+

+   /* Alloc storage for new instructions */

+   newInst = _mesa_alloc_instructions(newLen);

+   if (!newInst) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY,

+                  "glProgramString(inserting position_invariant code)");

+      return;

+   }

+

+   /*

+    * Generated instructions:

+    * newInst[0] = DP4 result.position.x, mvp.row[0], vertex.position;

+    * newInst[1] = DP4 result.position.y, mvp.row[1], vertex.position;

+    * newInst[2] = DP4 result.position.z, mvp.row[2], vertex.position;

+    * newInst[3] = DP4 result.position.w, mvp.row[3], vertex.position;

+    */

+   _mesa_init_instructions(newInst, 4);

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

+      newInst[i].Opcode = OPCODE_DP4;

+      newInst[i].DstReg.File = PROGRAM_OUTPUT;

+      newInst[i].DstReg.Index = VERT_RESULT_HPOS;

+      newInst[i].DstReg.WriteMask = (WRITEMASK_X << i);

+      newInst[i].SrcReg[0].File = PROGRAM_STATE_VAR;

+      newInst[i].SrcReg[0].Index = mvpRef[i];

+      newInst[i].SrcReg[0].Swizzle = SWIZZLE_NOOP;

+      newInst[i].SrcReg[1].File = PROGRAM_INPUT;

+      newInst[i].SrcReg[1].Index = VERT_ATTRIB_POS;

+      newInst[i].SrcReg[1].Swizzle = SWIZZLE_NOOP;

+   }

+

+   /* Append original instructions after new instructions */

+   _mesa_copy_instructions (newInst + 4, vprog->Base.Instructions, origLen);

+

+   /* free old instructions */

+   _mesa_free_instructions(vprog->Base.Instructions, origLen);

+

+   /* install new instructions */

+   vprog->Base.Instructions = newInst;

+   vprog->Base.NumInstructions = newLen;

+   vprog->Base.InputsRead |= VERT_BIT_POS;

+   vprog->Base.OutputsWritten |= BITFIELD64_BIT(VERT_RESULT_HPOS);

+}

+

+

+static void

+_mesa_insert_mvp_mad_code(struct gl_context *ctx, struct gl_vertex_program *vprog)

+{

+   struct prog_instruction *newInst;

+   const GLuint origLen = vprog->Base.NumInstructions;

+   const GLuint newLen = origLen + 4;

+   GLuint hposTemp;

+   GLuint i;

+

+   /*

+    * Setup state references for the modelview/projection matrix.

+    * XXX we should check if these state vars are already declared.

+    */

+   static const gl_state_index mvpState[4][STATE_LENGTH] = {

+      { STATE_MVP_MATRIX, 0, 0, 0, STATE_MATRIX_TRANSPOSE },

+      { STATE_MVP_MATRIX, 0, 1, 1, STATE_MATRIX_TRANSPOSE },

+      { STATE_MVP_MATRIX, 0, 2, 2, STATE_MATRIX_TRANSPOSE },

+      { STATE_MVP_MATRIX, 0, 3, 3, STATE_MATRIX_TRANSPOSE },

+   };

+   GLint mvpRef[4];

+

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

+      mvpRef[i] = _mesa_add_state_reference(vprog->Base.Parameters,

+                                            mvpState[i]);

+   }

+

+   /* Alloc storage for new instructions */

+   newInst = _mesa_alloc_instructions(newLen);

+   if (!newInst) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY,

+                  "glProgramString(inserting position_invariant code)");

+      return;

+   }

+

+   /* TEMP hposTemp; */

+   hposTemp = vprog->Base.NumTemporaries++;

+

+   /*

+    * Generated instructions:

+    *    emit_op2(p, OPCODE_MUL, tmp, 0, swizzle1(src,X), mat[0]);

+    *    emit_op3(p, OPCODE_MAD, tmp, 0, swizzle1(src,Y), mat[1], tmp);

+    *    emit_op3(p, OPCODE_MAD, tmp, 0, swizzle1(src,Z), mat[2], tmp);

+    *    emit_op3(p, OPCODE_MAD, dest, 0, swizzle1(src,W), mat[3], tmp);

+    */

+   _mesa_init_instructions(newInst, 4);

+

+   newInst[0].Opcode = OPCODE_MUL;

+   newInst[0].DstReg.File = PROGRAM_TEMPORARY;

+   newInst[0].DstReg.Index = hposTemp;

+   newInst[0].DstReg.WriteMask = WRITEMASK_XYZW;

+   newInst[0].SrcReg[0].File = PROGRAM_INPUT;

+   newInst[0].SrcReg[0].Index = VERT_ATTRIB_POS;

+   newInst[0].SrcReg[0].Swizzle = SWIZZLE_XXXX;

+   newInst[0].SrcReg[1].File = PROGRAM_STATE_VAR;

+   newInst[0].SrcReg[1].Index = mvpRef[0];

+   newInst[0].SrcReg[1].Swizzle = SWIZZLE_NOOP;

+

+   for (i = 1; i <= 2; i++) {

+      newInst[i].Opcode = OPCODE_MAD;

+      newInst[i].DstReg.File = PROGRAM_TEMPORARY;

+      newInst[i].DstReg.Index = hposTemp;

+      newInst[i].DstReg.WriteMask = WRITEMASK_XYZW;

+      newInst[i].SrcReg[0].File = PROGRAM_INPUT;

+      newInst[i].SrcReg[0].Index = VERT_ATTRIB_POS;

+      newInst[i].SrcReg[0].Swizzle = MAKE_SWIZZLE4(i,i,i,i);

+      newInst[i].SrcReg[1].File = PROGRAM_STATE_VAR;

+      newInst[i].SrcReg[1].Index = mvpRef[i];

+      newInst[i].SrcReg[1].Swizzle = SWIZZLE_NOOP;

+      newInst[i].SrcReg[2].File = PROGRAM_TEMPORARY;

+      newInst[i].SrcReg[2].Index = hposTemp;

+      newInst[1].SrcReg[2].Swizzle = SWIZZLE_NOOP;

+   }

+

+   newInst[3].Opcode = OPCODE_MAD;

+   newInst[3].DstReg.File = PROGRAM_OUTPUT;

+   newInst[3].DstReg.Index = VERT_RESULT_HPOS;

+   newInst[3].DstReg.WriteMask = WRITEMASK_XYZW;

+   newInst[3].SrcReg[0].File = PROGRAM_INPUT;

+   newInst[3].SrcReg[0].Index = VERT_ATTRIB_POS;

+   newInst[3].SrcReg[0].Swizzle = SWIZZLE_WWWW;

+   newInst[3].SrcReg[1].File = PROGRAM_STATE_VAR;

+   newInst[3].SrcReg[1].Index = mvpRef[3];

+   newInst[3].SrcReg[1].Swizzle = SWIZZLE_NOOP;

+   newInst[3].SrcReg[2].File = PROGRAM_TEMPORARY;

+   newInst[3].SrcReg[2].Index = hposTemp;

+   newInst[3].SrcReg[2].Swizzle = SWIZZLE_NOOP;

+

+

+   /* Append original instructions after new instructions */

+   _mesa_copy_instructions (newInst + 4, vprog->Base.Instructions, origLen);

+

+   /* free old instructions */

+   _mesa_free_instructions(vprog->Base.Instructions, origLen);

+

+   /* install new instructions */

+   vprog->Base.Instructions = newInst;

+   vprog->Base.NumInstructions = newLen;

+   vprog->Base.InputsRead |= VERT_BIT_POS;

+   vprog->Base.OutputsWritten |= BITFIELD64_BIT(VERT_RESULT_HPOS);

+}

+

+

+void

+_mesa_insert_mvp_code(struct gl_context *ctx, struct gl_vertex_program *vprog)

+{

+   if (ctx->mvp_with_dp4) 

+      _mesa_insert_mvp_dp4_code( ctx, vprog );

+   else

+      _mesa_insert_mvp_mad_code( ctx, vprog );

+}

+      

+

+

+

+

+

+/**

+ * Append extra instructions onto the given fragment program to implement

+ * the fog mode specified by fprog->FogOption.

+ * The fragment.fogcoord input is used to compute the fog blend factor.

+ *

+ * XXX with a little work, this function could be adapted to add fog code

+ * to vertex programs too.

+ */

+void

+_mesa_append_fog_code(struct gl_context *ctx, struct gl_fragment_program *fprog)

+{

+   static const gl_state_index fogPStateOpt[STATE_LENGTH]

+      = { STATE_INTERNAL, STATE_FOG_PARAMS_OPTIMIZED, 0, 0, 0 };

+   static const gl_state_index fogColorState[STATE_LENGTH]

+      = { STATE_FOG_COLOR, 0, 0, 0, 0};

+   struct prog_instruction *newInst, *inst;

+   const GLuint origLen = fprog->Base.NumInstructions;

+   const GLuint newLen = origLen + 5;

+   GLuint i;

+   GLint fogPRefOpt, fogColorRef; /* state references */

+   GLuint colorTemp, fogFactorTemp; /* temporary registerss */

+

+   if (fprog->FogOption == GL_NONE) {

+      _mesa_problem(ctx, "_mesa_append_fog_code() called for fragment program"

+                    " with FogOption == GL_NONE");

+      return;

+   }

+

+   /* Alloc storage for new instructions */

+   newInst = _mesa_alloc_instructions(newLen);

+   if (!newInst) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY,

+                  "glProgramString(inserting fog_option code)");

+      return;

+   }

+

+   /* Copy orig instructions into new instruction buffer */

+   _mesa_copy_instructions(newInst, fprog->Base.Instructions, origLen);

+

+   /* PARAM fogParamsRefOpt = internal optimized fog params; */

+   fogPRefOpt

+      = _mesa_add_state_reference(fprog->Base.Parameters, fogPStateOpt);

+   /* PARAM fogColorRef = state.fog.color; */

+   fogColorRef

+      = _mesa_add_state_reference(fprog->Base.Parameters, fogColorState);

+

+   /* TEMP colorTemp; */

+   colorTemp = fprog->Base.NumTemporaries++;

+   /* TEMP fogFactorTemp; */

+   fogFactorTemp = fprog->Base.NumTemporaries++;

+

+   /* Scan program to find where result.color is written */

+   inst = newInst;

+   for (i = 0; i < fprog->Base.NumInstructions; i++) {

+      if (inst->Opcode == OPCODE_END)

+         break;

+      if (inst->DstReg.File == PROGRAM_OUTPUT &&

+          inst->DstReg.Index == FRAG_RESULT_COLOR) {

+         /* change the instruction to write to colorTemp w/ clamping */

+         inst->DstReg.File = PROGRAM_TEMPORARY;

+         inst->DstReg.Index = colorTemp;

+         inst->SaturateMode = SATURATE_ZERO_ONE;

+         /* don't break (may be several writes to result.color) */

+      }

+      inst++;

+   }

+   assert(inst->Opcode == OPCODE_END); /* we'll overwrite this inst */

+

+   _mesa_init_instructions(inst, 5);

+

+   /* emit instructions to compute fog blending factor */

+   if (fprog->FogOption == GL_LINEAR) {

+      /* MAD fogFactorTemp.x, fragment.fogcoord.x, fogPRefOpt.x, fogPRefOpt.y; */

+      inst->Opcode = OPCODE_MAD;

+      inst->DstReg.File = PROGRAM_TEMPORARY;

+      inst->DstReg.Index = fogFactorTemp;

+      inst->DstReg.WriteMask = WRITEMASK_X;

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

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

+      inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;

+      inst->SrcReg[1].File = PROGRAM_STATE_VAR;

+      inst->SrcReg[1].Index = fogPRefOpt;

+      inst->SrcReg[1].Swizzle = SWIZZLE_XXXX;

+      inst->SrcReg[2].File = PROGRAM_STATE_VAR;

+      inst->SrcReg[2].Index = fogPRefOpt;

+      inst->SrcReg[2].Swizzle = SWIZZLE_YYYY;

+      inst->SaturateMode = SATURATE_ZERO_ONE;

+      inst++;

+   }

+   else {

+      ASSERT(fprog->FogOption == GL_EXP || fprog->FogOption == GL_EXP2);

+      /* fogPRefOpt.z = d/ln(2), fogPRefOpt.w = d/sqrt(ln(2) */

+      /* EXP: MUL fogFactorTemp.x, fogPRefOpt.z, fragment.fogcoord.x; */

+      /* EXP2: MUL fogFactorTemp.x, fogPRefOpt.w, fragment.fogcoord.x; */

+      inst->Opcode = OPCODE_MUL;

+      inst->DstReg.File = PROGRAM_TEMPORARY;

+      inst->DstReg.Index = fogFactorTemp;

+      inst->DstReg.WriteMask = WRITEMASK_X;

+      inst->SrcReg[0].File = PROGRAM_STATE_VAR;

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

+      inst->SrcReg[0].Swizzle

+         = (fprog->FogOption == GL_EXP) ? SWIZZLE_ZZZZ : SWIZZLE_WWWW;

+      inst->SrcReg[1].File = PROGRAM_INPUT;

+      inst->SrcReg[1].Index = FRAG_ATTRIB_FOGC;

+      inst->SrcReg[1].Swizzle = SWIZZLE_XXXX;

+      inst++;

+      if (fprog->FogOption == GL_EXP2) {

+         /* MUL fogFactorTemp.x, fogFactorTemp.x, fogFactorTemp.x; */

+         inst->Opcode = OPCODE_MUL;

+         inst->DstReg.File = PROGRAM_TEMPORARY;

+         inst->DstReg.Index = fogFactorTemp;

+         inst->DstReg.WriteMask = WRITEMASK_X;

+         inst->SrcReg[0].File = PROGRAM_TEMPORARY;

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

+         inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;

+         inst->SrcReg[1].File = PROGRAM_TEMPORARY;

+         inst->SrcReg[1].Index = fogFactorTemp;

+         inst->SrcReg[1].Swizzle = SWIZZLE_XXXX;

+         inst++;

+      }

+      /* EX2_SAT fogFactorTemp.x, -fogFactorTemp.x; */

+      inst->Opcode = OPCODE_EX2;

+      inst->DstReg.File = PROGRAM_TEMPORARY;

+      inst->DstReg.Index = fogFactorTemp;

+      inst->DstReg.WriteMask = WRITEMASK_X;

+      inst->SrcReg[0].File = PROGRAM_TEMPORARY;

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

+      inst->SrcReg[0].Negate = NEGATE_XYZW;

+      inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;

+      inst->SaturateMode = SATURATE_ZERO_ONE;

+      inst++;

+   }

+   /* LRP result.color.xyz, fogFactorTemp.xxxx, colorTemp, fogColorRef; */

+   inst->Opcode = OPCODE_LRP;

+   inst->DstReg.File = PROGRAM_OUTPUT;

+   inst->DstReg.Index = FRAG_RESULT_COLOR;

+   inst->DstReg.WriteMask = WRITEMASK_XYZ;

+   inst->SrcReg[0].File = PROGRAM_TEMPORARY;

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

+   inst->SrcReg[0].Swizzle = SWIZZLE_XXXX;

+   inst->SrcReg[1].File = PROGRAM_TEMPORARY;

+   inst->SrcReg[1].Index = colorTemp;

+   inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;

+   inst->SrcReg[2].File = PROGRAM_STATE_VAR;

+   inst->SrcReg[2].Index = fogColorRef;

+   inst->SrcReg[2].Swizzle = SWIZZLE_NOOP;

+   inst++;

+   /* MOV result.color.w, colorTemp.x;  # copy alpha */

+   inst->Opcode = OPCODE_MOV;

+   inst->DstReg.File = PROGRAM_OUTPUT;

+   inst->DstReg.Index = FRAG_RESULT_COLOR;

+   inst->DstReg.WriteMask = WRITEMASK_W;

+   inst->SrcReg[0].File = PROGRAM_TEMPORARY;

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

+   inst->SrcReg[0].Swizzle = SWIZZLE_NOOP;

+   inst++;

+   /* END; */

+   inst->Opcode = OPCODE_END;

+   inst++;

+

+   /* free old instructions */

+   _mesa_free_instructions(fprog->Base.Instructions, origLen);

+

+   /* install new instructions */

+   fprog->Base.Instructions = newInst;

+   fprog->Base.NumInstructions = inst - newInst;

+   fprog->Base.InputsRead |= FRAG_BIT_FOGC;

+   /* XXX do this?  fprog->FogOption = GL_NONE; */

+}

+

+

+

+static GLboolean

+is_texture_instruction(const struct prog_instruction *inst)

+{

+   switch (inst->Opcode) {

+   case OPCODE_TEX:

+   case OPCODE_TXB:

+   case OPCODE_TXD:

+   case OPCODE_TXL:

+   case OPCODE_TXP:

+   case OPCODE_TXP_NV:

+      return GL_TRUE;

+   default:

+      return GL_FALSE;

+   }

+}

+      

+

+/**

+ * Count the number of texure indirections in the given program.

+ * The program's NumTexIndirections field will be updated.

+ * See the GL_ARB_fragment_program spec (issue 24) for details.

+ * XXX we count texture indirections in texenvprogram.c (maybe use this code

+ * instead and elsewhere).

+ */

+void

+_mesa_count_texture_indirections(struct gl_program *prog)

+{

+   GLuint indirections = 1;

+   GLbitfield tempsOutput = 0x0;

+   GLbitfield aluTemps = 0x0;

+   GLuint i;

+

+   for (i = 0; i < prog->NumInstructions; i++) {

+      const struct prog_instruction *inst = prog->Instructions + i;

+

+      if (is_texture_instruction(inst)) {

+         if (((inst->SrcReg[0].File == PROGRAM_TEMPORARY) && 

+              (tempsOutput & (1 << inst->SrcReg[0].Index))) ||

+             ((inst->Opcode != OPCODE_KIL) &&

+              (inst->DstReg.File == PROGRAM_TEMPORARY) && 

+              (aluTemps & (1 << inst->DstReg.Index)))) 

+            {

+               indirections++;

+               tempsOutput = 0x0;

+               aluTemps = 0x0;

+            }

+      }

+      else {

+         GLuint j;

+         for (j = 0; j < 3; j++) {

+            if (inst->SrcReg[j].File == PROGRAM_TEMPORARY)

+               aluTemps |= (1 << inst->SrcReg[j].Index);

+         }

+         if (inst->DstReg.File == PROGRAM_TEMPORARY)

+            aluTemps |= (1 << inst->DstReg.Index);

+      }

+

+      if ((inst->Opcode != OPCODE_KIL) && (inst->DstReg.File == PROGRAM_TEMPORARY))

+         tempsOutput |= (1 << inst->DstReg.Index);

+   }

+

+   prog->NumTexIndirections = indirections;

+}

+

+

+/**

+ * Count number of texture instructions in given program and update the

+ * program's NumTexInstructions field.

+ */

+void

+_mesa_count_texture_instructions(struct gl_program *prog)

+{

+   GLuint i;

+   prog->NumTexInstructions = 0;

+   for (i = 0; i < prog->NumInstructions; i++) {

+      prog->NumTexInstructions += is_texture_instruction(prog->Instructions + i);

+   }

+}

+

+

+/**

+ * Scan/rewrite program to remove reads of custom (output) registers.

+ * The passed type has to be either PROGRAM_OUTPUT or PROGRAM_VARYING

+ * (for vertex shaders).

+ * In GLSL shaders, varying vars can be read and written.

+ * On some hardware, trying to read an output register causes trouble.

+ * So, rewrite the program to use a temporary register in this case.

+ */

+void

+_mesa_remove_output_reads(struct gl_program *prog, gl_register_file type)

+{

+   GLuint i;

+   GLint outputMap[VERT_RESULT_MAX];

+   GLuint numVaryingReads = 0;

+   GLboolean usedTemps[MAX_PROGRAM_TEMPS];

+   GLuint firstTemp = 0;

+

+   _mesa_find_used_registers(prog, PROGRAM_TEMPORARY,

+                             usedTemps, MAX_PROGRAM_TEMPS);

+

+   assert(type == PROGRAM_VARYING || type == PROGRAM_OUTPUT);

+   assert(prog->Target == GL_VERTEX_PROGRAM_ARB || type != PROGRAM_VARYING);

+

+   for (i = 0; i < VERT_RESULT_MAX; i++)

+      outputMap[i] = -1;

+

+   /* look for instructions which read from varying vars */

+   for (i = 0; i < prog->NumInstructions; i++) {

+      struct prog_instruction *inst = prog->Instructions + i;

+      const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode);

+      GLuint j;

+      for (j = 0; j < numSrc; j++) {

+         if (inst->SrcReg[j].File == type) {

+            /* replace the read with a temp reg */

+            const GLuint var = inst->SrcReg[j].Index;

+            if (outputMap[var] == -1) {

+               numVaryingReads++;

+               outputMap[var] = _mesa_find_free_register(usedTemps,

+                                                         MAX_PROGRAM_TEMPS,

+                                                         firstTemp);

+               firstTemp = outputMap[var] + 1;

+            }

+            inst->SrcReg[j].File = PROGRAM_TEMPORARY;

+            inst->SrcReg[j].Index = outputMap[var];

+         }

+      }

+   }

+

+   if (numVaryingReads == 0)

+      return; /* nothing to be done */

+

+   /* look for instructions which write to the varying vars identified above */

+   for (i = 0; i < prog->NumInstructions; i++) {

+      struct prog_instruction *inst = prog->Instructions + i;

+      if (inst->DstReg.File == type &&

+          outputMap[inst->DstReg.Index] >= 0) {

+         /* change inst to write to the temp reg, instead of the varying */

+         inst->DstReg.File = PROGRAM_TEMPORARY;

+         inst->DstReg.Index = outputMap[inst->DstReg.Index];

+      }

+   }

+

+   /* insert new instructions to copy the temp vars to the varying vars */

+   {

+      struct prog_instruction *inst;

+      GLint endPos, var;

+

+      /* Look for END instruction and insert the new varying writes */

+      endPos = -1;

+      for (i = 0; i < prog->NumInstructions; i++) {

+         struct prog_instruction *inst = prog->Instructions + i;

+         if (inst->Opcode == OPCODE_END) {

+            endPos = i;

+            _mesa_insert_instructions(prog, i, numVaryingReads);

+            break;

+         }

+      }

+

+      assert(endPos >= 0);

+

+      /* insert new MOV instructions here */

+      inst = prog->Instructions + endPos;

+      for (var = 0; var < VERT_RESULT_MAX; var++) {

+         if (outputMap[var] >= 0) {

+            /* MOV VAR[var], TEMP[tmp]; */

+            inst->Opcode = OPCODE_MOV;

+            inst->DstReg.File = type;

+            inst->DstReg.Index = var;

+            inst->SrcReg[0].File = PROGRAM_TEMPORARY;

+            inst->SrcReg[0].Index = outputMap[var];

+            inst++;

+         }

+      }

+   }

+}

+

+

+/**

+ * Make the given fragment program into a "no-op" shader.

+ * Actually, just copy the incoming fragment color (or texcoord)

+ * to the output color.

+ * This is for debug/test purposes.

+ */

+void

+_mesa_nop_fragment_program(struct gl_context *ctx, struct gl_fragment_program *prog)

+{

+   struct prog_instruction *inst;

+   GLuint inputAttr;

+

+   inst = _mesa_alloc_instructions(2);

+   if (!inst) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "_mesa_nop_fragment_program");

+      return;

+   }

+

+   _mesa_init_instructions(inst, 2);

+

+   inst[0].Opcode = OPCODE_MOV;

+   inst[0].DstReg.File = PROGRAM_OUTPUT;

+   inst[0].DstReg.Index = FRAG_RESULT_COLOR;

+   inst[0].SrcReg[0].File = PROGRAM_INPUT;

+   if (prog->Base.InputsRead & FRAG_BIT_COL0)

+      inputAttr = FRAG_ATTRIB_COL0;

+   else

+      inputAttr = FRAG_ATTRIB_TEX0;

+   inst[0].SrcReg[0].Index = inputAttr;

+

+   inst[1].Opcode = OPCODE_END;

+

+   _mesa_free_instructions(prog->Base.Instructions,

+                           prog->Base.NumInstructions);

+

+   prog->Base.Instructions = inst;

+   prog->Base.NumInstructions = 2;

+   prog->Base.InputsRead = 1 << inputAttr;

+   prog->Base.OutputsWritten = BITFIELD64_BIT(FRAG_RESULT_COLOR);

+}

+

+

+/**

+ * \sa _mesa_nop_fragment_program

+ * Replace the given vertex program with a "no-op" program that just

+ * transforms vertex position and emits color.

+ */

+void

+_mesa_nop_vertex_program(struct gl_context *ctx, struct gl_vertex_program *prog)

+{

+   struct prog_instruction *inst;

+   GLuint inputAttr;

+

+   /*

+    * Start with a simple vertex program that emits color.

+    */

+   inst = _mesa_alloc_instructions(2);

+   if (!inst) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "_mesa_nop_vertex_program");

+      return;

+   }

+

+   _mesa_init_instructions(inst, 2);

+

+   inst[0].Opcode = OPCODE_MOV;

+   inst[0].DstReg.File = PROGRAM_OUTPUT;

+   inst[0].DstReg.Index = VERT_RESULT_COL0;

+   inst[0].SrcReg[0].File = PROGRAM_INPUT;

+   if (prog->Base.InputsRead & VERT_BIT_COLOR0)

+      inputAttr = VERT_ATTRIB_COLOR0;

+   else

+      inputAttr = VERT_ATTRIB_TEX0;

+   inst[0].SrcReg[0].Index = inputAttr;

+

+   inst[1].Opcode = OPCODE_END;

+

+   _mesa_free_instructions(prog->Base.Instructions,

+                           prog->Base.NumInstructions);

+

+   prog->Base.Instructions = inst;

+   prog->Base.NumInstructions = 2;

+   prog->Base.InputsRead = 1 << inputAttr;

+   prog->Base.OutputsWritten = BITFIELD64_BIT(VERT_RESULT_COL0);

+

+   /*

+    * Now insert code to do standard modelview/projection transformation.

+    */

+   _mesa_insert_mvp_code(ctx, prog);

+}