xserver and mesa git update 28-12-2010

1 files changed, 1073 insertions, 976 deletions

diff --git a/mesalib/src/mesa/program/program.c b/mesalib/src/mesa/program/program.c
index 06b9539bd..eff600685 100644
--- a/mesalib/src/mesa/program/program.c
+++ b/mesalib/src/mesa/program/program.c
@@ -1,976 +1,1073 @@
-/*
- * 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 program.c
- * Vertex and fragment program support functions.
- * \author Brian Paul
- */
-
-
-#include "main/glheader.h"
-#include "main/context.h"
-#include "main/hash.h"
-#include "program.h"
-#include "prog_cache.h"
-#include "prog_parameter.h"
-#include "prog_instruction.h"
-
-
-/**
- * A pointer to this dummy program is put into the hash table when
- * glGenPrograms is called.
- */
-struct gl_program _mesa_DummyProgram;
-
-
-/**
- * Init context's vertex/fragment program state
- */
-void
-_mesa_init_program(GLcontext *ctx)
-{
-   GLuint i;
-
-   /*
-    * If this assertion fails, we need to increase the field
-    * size for register indexes (see INST_INDEX_BITS).
-    */
-   ASSERT(ctx->Const.VertexProgram.MaxUniformComponents / 4
-          <= (1 << INST_INDEX_BITS));
-   ASSERT(ctx->Const.FragmentProgram.MaxUniformComponents / 4
-          <= (1 << INST_INDEX_BITS));
-
-   ASSERT(ctx->Const.VertexProgram.MaxTemps <= (1 << INST_INDEX_BITS));
-   ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= (1 << INST_INDEX_BITS));
-   ASSERT(ctx->Const.FragmentProgram.MaxTemps <= (1 << INST_INDEX_BITS));
-   ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= (1 << INST_INDEX_BITS));
-
-   ASSERT(ctx->Const.VertexProgram.MaxUniformComponents <= 4 * MAX_UNIFORMS);
-   ASSERT(ctx->Const.FragmentProgram.MaxUniformComponents <= 4 * MAX_UNIFORMS);
-
-   /* If this fails, increase prog_instruction::TexSrcUnit size */
-   ASSERT(MAX_TEXTURE_UNITS < (1 << 5));
-
-   /* If this fails, increase prog_instruction::TexSrcTarget size */
-   ASSERT(NUM_TEXTURE_TARGETS < (1 << 3));
-
-   ctx->Program.ErrorPos = -1;
-   ctx->Program.ErrorString = _mesa_strdup("");
-
-#if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
-   ctx->VertexProgram.Enabled = GL_FALSE;
-#if FEATURE_es2_glsl
-   ctx->VertexProgram.PointSizeEnabled =
-      (ctx->API == API_OPENGLES2) ? GL_TRUE : GL_FALSE;
-#else
-   ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
-#endif
-   ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
-   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
-                            ctx->Shared->DefaultVertexProgram);
-   assert(ctx->VertexProgram.Current);
-   for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
-      ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
-      ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
-   }
-   ctx->VertexProgram.Cache = _mesa_new_program_cache();
-#endif
-
-#if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
-   ctx->FragmentProgram.Enabled = GL_FALSE;
-   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
-                            ctx->Shared->DefaultFragmentProgram);
-   assert(ctx->FragmentProgram.Current);
-   ctx->FragmentProgram.Cache = _mesa_new_program_cache();
-#endif
-
-#if FEATURE_ARB_geometry_shader4
-   ctx->GeometryProgram.Enabled = GL_FALSE;
-   /* right now by default we don't have a geometry program */
-   _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current,
-                            NULL);
-   ctx->GeometryProgram.Cache = _mesa_new_program_cache();
-#endif
-
-   /* XXX probably move this stuff */
-#if FEATURE_ATI_fragment_shader
-   ctx->ATIFragmentShader.Enabled = GL_FALSE;
-   ctx->ATIFragmentShader.Current = ctx->Shared->DefaultFragmentShader;
-   assert(ctx->ATIFragmentShader.Current);
-   ctx->ATIFragmentShader.Current->RefCount++;
-#endif
-}
-
-
-/**
- * Free a context's vertex/fragment program state
- */
-void
-_mesa_free_program_data(GLcontext *ctx)
-{
-#if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
-   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
-   _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);
-#endif
-#if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
-   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
-   _mesa_delete_program_cache(ctx, ctx->FragmentProgram.Cache);
-#endif
-#if FEATURE_ARB_geometry_shader4
-   _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current, NULL);
-   _mesa_delete_program_cache(ctx, ctx->GeometryProgram.Cache);
-#endif
-   /* XXX probably move this stuff */
-#if FEATURE_ATI_fragment_shader
-   if (ctx->ATIFragmentShader.Current) {
-      ctx->ATIFragmentShader.Current->RefCount--;
-      if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
-         free(ctx->ATIFragmentShader.Current);
-      }
-   }
-#endif
-   free((void *) ctx->Program.ErrorString);
-}
-
-
-/**
- * Update the default program objects in the given context to reference those
- * specified in the shared state and release those referencing the old
- * shared state.
- */
-void
-_mesa_update_default_objects_program(GLcontext *ctx)
-{
-#if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
-   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,
-                            (struct gl_vertex_program *)
-                            ctx->Shared->DefaultVertexProgram);
-   assert(ctx->VertexProgram.Current);
-#endif
-
-#if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
-   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,
-                            (struct gl_fragment_program *)
-                            ctx->Shared->DefaultFragmentProgram);
-   assert(ctx->FragmentProgram.Current);
-#endif
-
-#if FEATURE_ARB_geometry_shader4
-   _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current,
-                            (struct gl_geometry_program *)
-                            ctx->Shared->DefaultGeometryProgram);
-#endif
-
-   /* XXX probably move this stuff */
-#if FEATURE_ATI_fragment_shader
-   if (ctx->ATIFragmentShader.Current) {
-      ctx->ATIFragmentShader.Current->RefCount--;
-      if (ctx->ATIFragmentShader.Current->RefCount <= 0) {
-         free(ctx->ATIFragmentShader.Current);
-      }
-   }
-   ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;
-   assert(ctx->ATIFragmentShader.Current);
-   ctx->ATIFragmentShader.Current->RefCount++;
-#endif
-}
-
-
-/**
- * Set the vertex/fragment program error state (position and error string).
- * This is generally called from within the parsers.
- */
-void
-_mesa_set_program_error(GLcontext *ctx, GLint pos, const char *string)
-{
-   ctx->Program.ErrorPos = pos;
-   free((void *) ctx->Program.ErrorString);
-   if (!string)
-      string = "";
-   ctx->Program.ErrorString = _mesa_strdup(string);
-}
-
-
-/**
- * Find the line number and column for 'pos' within 'string'.
- * Return a copy of the line which contains 'pos'.  Free the line with
- * free().
- * \param string  the program string
- * \param pos     the position within the string
- * \param line    returns the line number corresponding to 'pos'.
- * \param col     returns the column number corresponding to 'pos'.
- * \return copy of the line containing 'pos'.
- */
-const GLubyte *
-_mesa_find_line_column(const GLubyte *string, const GLubyte *pos,
-                       GLint *line, GLint *col)
-{
-   const GLubyte *lineStart = string;
-   const GLubyte *p = string;
-   GLubyte *s;
-   int len;
-
-   *line = 1;
-
-   while (p != pos) {
-      if (*p == (GLubyte) '\n') {
-         (*line)++;
-         lineStart = p + 1;
-      }
-      p++;
-   }
-
-   *col = (pos - lineStart) + 1;
-
-   /* return copy of this line */
-   while (*p != 0 && *p != '\n')
-      p++;
-   len = p - lineStart;
-   s = (GLubyte *) malloc(len + 1);
-   memcpy(s, lineStart, len);
-   s[len] = 0;
-
-   return s;
-}
-
-
-/**
- * Initialize a new vertex/fragment program object.
- */
-static struct gl_program *
-_mesa_init_program_struct( GLcontext *ctx, struct gl_program *prog,
-                           GLenum target, GLuint id)
-{
-   (void) ctx;
-   if (prog) {
-      GLuint i;
-      memset(prog, 0, sizeof(*prog));
-      prog->Id = id;
-      prog->Target = target;
-      prog->Resident = GL_TRUE;
-      prog->RefCount = 1;
-      prog->Format = GL_PROGRAM_FORMAT_ASCII_ARB;
-
-      /* default mapping from samplers to texture units */
-      for (i = 0; i < MAX_SAMPLERS; i++)
-         prog->SamplerUnits[i] = i;
-   }
-
-   return prog;
-}
-
-
-/**
- * Initialize a new fragment program object.
- */
-struct gl_program *
-_mesa_init_fragment_program( GLcontext *ctx, struct gl_fragment_program *prog,
-                             GLenum target, GLuint id)
-{
-   if (prog)
-      return _mesa_init_program_struct( ctx, &prog->Base, target, id );
-   else
-      return NULL;
-}
-
-
-/**
- * Initialize a new vertex program object.
- */
-struct gl_program *
-_mesa_init_vertex_program( GLcontext *ctx, struct gl_vertex_program *prog,
-                           GLenum target, GLuint id)
-{
-   if (prog)
-      return _mesa_init_program_struct( ctx, &prog->Base, target, id );
-   else
-      return NULL;
-}
-
-
-/**
- * Initialize a new geometry program object.
- */
-struct gl_program *
-_mesa_init_geometry_program( GLcontext *ctx, struct gl_geometry_program *prog,
-                             GLenum target, GLuint id)
-{
-   if (prog)
-      return _mesa_init_program_struct( ctx, &prog->Base, target, id );
-   else
-      return NULL;
-}
-
-
-/**
- * Allocate and initialize a new fragment/vertex program object but
- * don't put it into the program hash table.  Called via
- * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
- * device driver function to implement OO deriviation with additional
- * types not understood by this function.
- *
- * \param ctx  context
- * \param id   program id/number
- * \param target  program target/type
- * \return  pointer to new program object
- */
-struct gl_program *
-_mesa_new_program(GLcontext *ctx, GLenum target, GLuint id)
-{
-   struct gl_program *prog;
-   switch (target) {
-   case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
-   case GL_VERTEX_STATE_PROGRAM_NV:
-      prog = _mesa_init_vertex_program(ctx, CALLOC_STRUCT(gl_vertex_program),
-                                       target, id );
-      break;
-   case GL_FRAGMENT_PROGRAM_NV:
-   case GL_FRAGMENT_PROGRAM_ARB:
-      prog =_mesa_init_fragment_program(ctx,
-                                         CALLOC_STRUCT(gl_fragment_program),
-                                         target, id );
-      break;
-   case MESA_GEOMETRY_PROGRAM:
-      prog = _mesa_init_geometry_program(ctx,
-                                         CALLOC_STRUCT(gl_geometry_program),
-                                         target, id);
-      break;
-   default:
-      _mesa_problem(ctx, "bad target in _mesa_new_program");
-      prog = NULL;
-   }
-   return prog;
-}
-
-
-/**
- * Delete a program and remove it from the hash table, ignoring the
- * reference count.
- * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
- * by a device driver function.
- */
-void
-_mesa_delete_program(GLcontext *ctx, struct gl_program *prog)
-{
-   (void) ctx;
-   ASSERT(prog);
-   ASSERT(prog->RefCount==0);
-
-   if (prog == &_mesa_DummyProgram)
-      return;
-
-   if (prog->String)
-      free(prog->String);
-
-   _mesa_free_instructions(prog->Instructions, prog->NumInstructions);
-
-   if (prog->Parameters) {
-      _mesa_free_parameter_list(prog->Parameters);
-   }
-   if (prog->Varying) {
-      _mesa_free_parameter_list(prog->Varying);
-   }
-   if (prog->Attributes) {
-      _mesa_free_parameter_list(prog->Attributes);
-   }
-
-   free(prog);
-}
-
-
-/**
- * Return the gl_program object for a given ID.
- * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of
- * casts elsewhere.
- */
-struct gl_program *
-_mesa_lookup_program(GLcontext *ctx, GLuint id)
-{
-   if (id)
-      return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);
-   else
-      return NULL;
-}
-
-
-/**
- * Reference counting for vertex/fragment programs
- */
-void
-_mesa_reference_program(GLcontext *ctx,
-                        struct gl_program **ptr,
-                        struct gl_program *prog)
-{
-   assert(ptr);
-   if (*ptr && prog) {
-      /* sanity check */
-      if ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB)
-         ASSERT(prog->Target == GL_VERTEX_PROGRAM_ARB);
-      else if ((*ptr)->Target == GL_FRAGMENT_PROGRAM_ARB)
-         ASSERT(prog->Target == GL_FRAGMENT_PROGRAM_ARB ||
-                prog->Target == GL_FRAGMENT_PROGRAM_NV);
-      else if ((*ptr)->Target == MESA_GEOMETRY_PROGRAM)
-         ASSERT(prog->Target == MESA_GEOMETRY_PROGRAM);
-   }
-   if (*ptr == prog) {
-      return;  /* no change */
-   }
-   if (*ptr) {
-      GLboolean deleteFlag;
-
-      /*_glthread_LOCK_MUTEX((*ptr)->Mutex);*/
-#if 0
-      printf("Program %p ID=%u Target=%s  Refcount-- to %d\n",
-             *ptr, (*ptr)->Id,
-             ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB ? "VP" :
-              ((*ptr)->Target == MESA_GEOMETRY_PROGRAM ? "GP" : "FP")),
-             (*ptr)->RefCount - 1);
-#endif
-      ASSERT((*ptr)->RefCount > 0);
-      (*ptr)->RefCount--;
-
-      deleteFlag = ((*ptr)->RefCount == 0);
-      /*_glthread_UNLOCK_MUTEX((*ptr)->Mutex);*/
-
-      if (deleteFlag) {
-         ASSERT(ctx);
-         ctx->Driver.DeleteProgram(ctx, *ptr);
-      }
-
-      *ptr = NULL;
-   }
-
-   assert(!*ptr);
-   if (prog) {
-      /*_glthread_LOCK_MUTEX(prog->Mutex);*/
-      prog->RefCount++;
-#if 0
-      printf("Program %p ID=%u Target=%s  Refcount++ to %d\n",
-             prog, prog->Id,
-             (prog->Target == GL_VERTEX_PROGRAM_ARB ? "VP" :
-              (prog->Target == MESA_GEOMETRY_PROGRAM ? "GP" : "FP")),
-             prog->RefCount);
-#endif
-      /*_glthread_UNLOCK_MUTEX(prog->Mutex);*/
-   }
-
-   *ptr = prog;
-}
-
-
-/**
- * Return a copy of a program.
- * XXX Problem here if the program object is actually OO-derivation
- * made by a device driver.
- */
-struct gl_program *
-_mesa_clone_program(GLcontext *ctx, const struct gl_program *prog)
-{
-   struct gl_program *clone;
-
-   clone = ctx->Driver.NewProgram(ctx, prog->Target, prog->Id);
-   if (!clone)
-      return NULL;
-
-   assert(clone->Target == prog->Target);
-   assert(clone->RefCount == 1);
-
-   clone->String = (GLubyte *) _mesa_strdup((char *) prog->String);
-   clone->Format = prog->Format;
-   clone->Instructions = _mesa_alloc_instructions(prog->NumInstructions);
-   if (!clone->Instructions) {
-      _mesa_reference_program(ctx, &clone, NULL);
-      return NULL;
-   }
-   _mesa_copy_instructions(clone->Instructions, prog->Instructions,
-                           prog->NumInstructions);
-   clone->InputsRead = prog->InputsRead;
-   clone->OutputsWritten = prog->OutputsWritten;
-   clone->SamplersUsed = prog->SamplersUsed;
-   clone->ShadowSamplers = prog->ShadowSamplers;
-   memcpy(clone->TexturesUsed, prog->TexturesUsed, sizeof(prog->TexturesUsed));
-
-   if (prog->Parameters)
-      clone->Parameters = _mesa_clone_parameter_list(prog->Parameters);
-   memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
-   if (prog->Varying)
-      clone->Varying = _mesa_clone_parameter_list(prog->Varying);
-   if (prog->Attributes)
-      clone->Attributes = _mesa_clone_parameter_list(prog->Attributes);
-   memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));
-   clone->IndirectRegisterFiles = prog->IndirectRegisterFiles;
-   clone->NumInstructions = prog->NumInstructions;
-   clone->NumTemporaries = prog->NumTemporaries;
-   clone->NumParameters = prog->NumParameters;
-   clone->NumAttributes = prog->NumAttributes;
-   clone->NumAddressRegs = prog->NumAddressRegs;
-   clone->NumNativeInstructions = prog->NumNativeInstructions;
-   clone->NumNativeTemporaries = prog->NumNativeTemporaries;
-   clone->NumNativeParameters = prog->NumNativeParameters;
-   clone->NumNativeAttributes = prog->NumNativeAttributes;
-   clone->NumNativeAddressRegs = prog->NumNativeAddressRegs;
-   clone->NumAluInstructions = prog->NumAluInstructions;
-   clone->NumTexInstructions = prog->NumTexInstructions;
-   clone->NumTexIndirections = prog->NumTexIndirections;
-   clone->NumNativeAluInstructions = prog->NumNativeAluInstructions;
-   clone->NumNativeTexInstructions = prog->NumNativeTexInstructions;
-   clone->NumNativeTexIndirections = prog->NumNativeTexIndirections;
-
-   switch (prog->Target) {
-   case GL_VERTEX_PROGRAM_ARB:
-      {
-         const struct gl_vertex_program *vp
-            = (const struct gl_vertex_program *) prog;
-         struct gl_vertex_program *vpc = (struct gl_vertex_program *) clone;
-         vpc->IsPositionInvariant = vp->IsPositionInvariant;
-         vpc->IsNVProgram = vp->IsNVProgram;
-      }
-      break;
-   case GL_FRAGMENT_PROGRAM_ARB:
-      {
-         const struct gl_fragment_program *fp
-            = (const struct gl_fragment_program *) prog;
-         struct gl_fragment_program *fpc = (struct gl_fragment_program *) clone;
-         fpc->FogOption = fp->FogOption;
-         fpc->UsesKill = fp->UsesKill;
-         fpc->OriginUpperLeft = fp->OriginUpperLeft;
-         fpc->PixelCenterInteger = fp->PixelCenterInteger;
-      }
-      break;
-   case MESA_GEOMETRY_PROGRAM:
-      {
-         const struct gl_geometry_program *gp
-            = (const struct gl_geometry_program *) prog;
-         struct gl_geometry_program *gpc = (struct gl_geometry_program *) clone;
-         gpc->VerticesOut = gp->VerticesOut;
-         gpc->InputType = gp->InputType;
-         gpc->OutputType = gp->OutputType;
-      }
-      break;
-   default:
-      _mesa_problem(NULL, "Unexpected target in _mesa_clone_program");
-   }
-
-   return clone;
-}
-
-
-/**
- * Insert 'count' NOP instructions at 'start' in the given program.
- * Adjust branch targets accordingly.
- */
-GLboolean
-_mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)
-{
-   const GLuint origLen = prog->NumInstructions;
-   const GLuint newLen = origLen + count;
-   struct prog_instruction *newInst;
-   GLuint i;
-
-   /* adjust branches */
-   for (i = 0; i < prog->NumInstructions; i++) {
-      struct prog_instruction *inst = prog->Instructions + i;
-      if (inst->BranchTarget > 0) {
-         if ((GLuint)inst->BranchTarget >= start) {
-            inst->BranchTarget += count;
-         }
-      }
-   }
-
-   /* Alloc storage for new instructions */
-   newInst = _mesa_alloc_instructions(newLen);
-   if (!newInst) {
-      return GL_FALSE;
-   }
-
-   /* Copy 'start' instructions into new instruction buffer */
-   _mesa_copy_instructions(newInst, prog->Instructions, start);
-
-   /* init the new instructions */
-   _mesa_init_instructions(newInst + start, count);
-
-   /* Copy the remaining/tail instructions to new inst buffer */
-   _mesa_copy_instructions(newInst + start + count,
-                           prog->Instructions + start,
-                           origLen - start);
-
-   /* free old instructions */
-   _mesa_free_instructions(prog->Instructions, origLen);
-
-   /* install new instructions */
-   prog->Instructions = newInst;
-   prog->NumInstructions = newLen;
-
-   return GL_TRUE;
-}
-
-/**
- * Delete 'count' instructions at 'start' in the given program.
- * Adjust branch targets accordingly.
- */
-GLboolean
-_mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)
-{
-   const GLuint origLen = prog->NumInstructions;
-   const GLuint newLen = origLen - count;
-   struct prog_instruction *newInst;
-   GLuint i;
-
-   /* adjust branches */
-   for (i = 0; i < prog->NumInstructions; i++) {
-      struct prog_instruction *inst = prog->Instructions + i;
-      if (inst->BranchTarget > 0) {
-         if (inst->BranchTarget > (GLint) start) {
-            inst->BranchTarget -= count;
-         }
-      }
-   }
-
-   /* Alloc storage for new instructions */
-   newInst = _mesa_alloc_instructions(newLen);
-   if (!newInst) {
-      return GL_FALSE;
-   }
-
-   /* Copy 'start' instructions into new instruction buffer */
-   _mesa_copy_instructions(newInst, prog->Instructions, start);
-
-   /* Copy the remaining/tail instructions to new inst buffer */
-   _mesa_copy_instructions(newInst + start,
-                           prog->Instructions + start + count,
-                           newLen - start);
-
-   /* free old instructions */
-   _mesa_free_instructions(prog->Instructions, origLen);
-
-   /* install new instructions */
-   prog->Instructions = newInst;
-   prog->NumInstructions = newLen;
-
-   return GL_TRUE;
-}
-
-
-/**
- * Search instructions for registers that match (oldFile, oldIndex),
- * replacing them with (newFile, newIndex).
- */
-static void
-replace_registers(struct prog_instruction *inst, GLuint numInst,
-                  GLuint oldFile, GLuint oldIndex,
-                  GLuint newFile, GLuint newIndex)
-{
-   GLuint i, j;
-   for (i = 0; i < numInst; i++) {
-      /* src regs */
-      for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {
-         if (inst[i].SrcReg[j].File == oldFile &&
-             inst[i].SrcReg[j].Index == oldIndex) {
-            inst[i].SrcReg[j].File = newFile;
-            inst[i].SrcReg[j].Index = newIndex;
-         }
-      }
-      /* dst reg */
-      if (inst[i].DstReg.File == oldFile && inst[i].DstReg.Index == oldIndex) {
-         inst[i].DstReg.File = newFile;
-         inst[i].DstReg.Index = newIndex;
-      }
-   }
-}
-
-
-/**
- * Search instructions for references to program parameters.  When found,
- * increment the parameter index by 'offset'.
- * Used when combining programs.
- */
-static void
-adjust_param_indexes(struct prog_instruction *inst, GLuint numInst,
-                     GLuint offset)
-{
-   GLuint i, j;
-   for (i = 0; i < numInst; i++) {
-      for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {
-         GLuint f = inst[i].SrcReg[j].File;
-         if (f == PROGRAM_CONSTANT ||
-             f == PROGRAM_UNIFORM ||
-             f == PROGRAM_STATE_VAR) {
-            inst[i].SrcReg[j].Index += offset;
-         }
-      }
-   }
-}
-
-
-/**
- * Combine two programs into one.  Fix instructions so the outputs of
- * the first program go to the inputs of the second program.
- */
-struct gl_program *
-_mesa_combine_programs(GLcontext *ctx,
-                       const struct gl_program *progA,
-                       const struct gl_program *progB)
-{
-   struct prog_instruction *newInst;
-   struct gl_program *newProg;
-   const GLuint lenA = progA->NumInstructions - 1; /* omit END instr */
-   const GLuint lenB = progB->NumInstructions;
-   const GLuint numParamsA = _mesa_num_parameters(progA->Parameters);
-   const GLuint newLength = lenA + lenB;
-   GLboolean usedTemps[MAX_PROGRAM_TEMPS];
-   GLuint firstTemp = 0;
-   GLbitfield inputsB;
-   GLuint i;
-
-   ASSERT(progA->Target == progB->Target);
-
-   newInst = _mesa_alloc_instructions(newLength);
-   if (!newInst)
-      return GL_FALSE;
-
-   _mesa_copy_instructions(newInst, progA->Instructions, lenA);
-   _mesa_copy_instructions(newInst + lenA, progB->Instructions, lenB);
-
-   /* adjust branch / instruction addresses for B's instructions */
-   for (i = 0; i < lenB; i++) {
-      newInst[lenA + i].BranchTarget += lenA;
-   }
-
-   newProg = ctx->Driver.NewProgram(ctx, progA->Target, 0);
-   newProg->Instructions = newInst;
-   newProg->NumInstructions = newLength;
-
-   /* find used temp regs (we may need new temps below) */
-   _mesa_find_used_registers(newProg, PROGRAM_TEMPORARY,
-                             usedTemps, MAX_PROGRAM_TEMPS);
-
-   if (newProg->Target == GL_FRAGMENT_PROGRAM_ARB) {
-      struct gl_fragment_program *fprogA, *fprogB, *newFprog;
-      GLbitfield progB_inputsRead = progB->InputsRead;
-      GLint progB_colorFile, progB_colorIndex;
-
-      fprogA = (struct gl_fragment_program *) progA;
-      fprogB = (struct gl_fragment_program *) progB;
-      newFprog = (struct gl_fragment_program *) newProg;
-
-      newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
-
-      /* We'll do a search and replace for instances
-       * of progB_colorFile/progB_colorIndex below...
-       */
-      progB_colorFile = PROGRAM_INPUT;
-      progB_colorIndex = FRAG_ATTRIB_COL0;
-
-      /*
-       * The fragment program may get color from a state var rather than
-       * a fragment input (vertex output) if it's constant.
-       * See the texenvprogram.c code.
-       * So, search the program's parameter list now to see if the program
-       * gets color from a state var instead of a conventional fragment
-       * input register.
-       */
-      for (i = 0; i < progB->Parameters->NumParameters; i++) {
-         struct gl_program_parameter *p = &progB->Parameters->Parameters[i];
-         if (p->Type == PROGRAM_STATE_VAR &&
-             p->StateIndexes[0] == STATE_INTERNAL &&
-             p->StateIndexes[1] == STATE_CURRENT_ATTRIB &&
-             p->StateIndexes[2] == VERT_ATTRIB_COLOR0) {
-            progB_inputsRead |= FRAG_BIT_COL0;
-            progB_colorFile = PROGRAM_STATE_VAR;
-            progB_colorIndex = i;
-            break;
-         }
-      }
-
-      /* Connect color outputs of fprogA to color inputs of fprogB, via a
-       * new temporary register.
-       */
-      if ((progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) &&
-          (progB_inputsRead & FRAG_BIT_COL0)) {
-         GLint tempReg = _mesa_find_free_register(usedTemps, MAX_PROGRAM_TEMPS,
-                                                  firstTemp);
-         if (tempReg < 0) {
-            _mesa_problem(ctx, "No free temp regs found in "
-                          "_mesa_combine_programs(), using 31");
-            tempReg = 31;
-         }
-         firstTemp = tempReg + 1;
-
-         /* replace writes to result.color[0] with tempReg */
-         replace_registers(newInst, lenA,
-                           PROGRAM_OUTPUT, FRAG_RESULT_COLOR,
-                           PROGRAM_TEMPORARY, tempReg);
-         /* replace reads from the input color with tempReg */
-         replace_registers(newInst + lenA, lenB,
-                           progB_colorFile, progB_colorIndex, /* search for */
-                           PROGRAM_TEMPORARY, tempReg  /* replace with */ );
-      }
-
-      /* compute combined program's InputsRead */
-      inputsB = progB_inputsRead;
-      if (progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) {
-         inputsB &= ~(1 << FRAG_ATTRIB_COL0);
-      }
-      newProg->InputsRead = progA->InputsRead | inputsB;
-      newProg->OutputsWritten = progB->OutputsWritten;
-      newProg->SamplersUsed = progA->SamplersUsed | progB->SamplersUsed;
-   }
-   else {
-      /* vertex program */
-      assert(0);      /* XXX todo */
-   }
-
-   /*
-    * Merge parameters (uniforms, constants, etc)
-    */
-   newProg->Parameters = _mesa_combine_parameter_lists(progA->Parameters,
-                                                       progB->Parameters);
-
-   adjust_param_indexes(newInst + lenA, lenB, numParamsA);
-
-
-   return newProg;
-}
-
-
-/**
- * Populate the 'used' array with flags indicating which registers (TEMPs,
- * INPUTs, OUTPUTs, etc, are used by the given program.
- * \param file  type of register to scan for
- * \param used  returns true/false flags for in use / free
- * \param usedSize  size of the 'used' array
- */
-void
-_mesa_find_used_registers(const struct gl_program *prog,
-                          gl_register_file file,
-                          GLboolean used[], GLuint usedSize)
-{
-   GLuint i, j;
-
-   memset(used, 0, usedSize);
-
-   for (i = 0; i < prog->NumInstructions; i++) {
-      const struct prog_instruction *inst = prog->Instructions + i;
-      const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
-
-      if (inst->DstReg.File == file) {
-         ASSERT(inst->DstReg.Index < usedSize);
-         if(inst->DstReg.Index < usedSize)
-            used[inst->DstReg.Index] = GL_TRUE;
-      }
-
-      for (j = 0; j < n; j++) {
-         if (inst->SrcReg[j].File == file) {
-            ASSERT(inst->SrcReg[j].Index < usedSize);
-            if(inst->SrcReg[j].Index < usedSize)
-               used[inst->SrcReg[j].Index] = GL_TRUE;
-         }
-      }
-   }
-}
-
-
-/**
- * Scan the given 'used' register flag array for the first entry
- * that's >= firstReg.
- * \param used  vector of flags indicating registers in use (as returned
- *              by _mesa_find_used_registers())
- * \param usedSize  size of the 'used' array
- * \param firstReg  first register to start searching at
- * \return index of unused register, or -1 if none.
- */
-GLint
-_mesa_find_free_register(const GLboolean used[],
-                         GLuint usedSize, GLuint firstReg)
-{
-   GLuint i;
-
-   assert(firstReg < usedSize);
-
-   for (i = firstReg; i < usedSize; i++)
-      if (!used[i])
-         return i;
-
-   return -1;
-}
-
-
-/**
- * "Post-process" a GPU program.  This is intended to be used for debugging.
- * Example actions include no-op'ing instructions or changing instruction
- * behaviour.
- */
-void
-_mesa_postprocess_program(GLcontext *ctx, struct gl_program *prog)
-{
-   static const GLfloat white[4] = { 0.5, 0.5, 0.5, 0.5 };
-   GLuint i;
-   GLuint whiteSwizzle;
-   GLint whiteIndex = _mesa_add_unnamed_constant(prog->Parameters,
-                                                 white, 4, &whiteSwizzle);
-
-   (void) whiteIndex;
-
-   for (i = 0; i < prog->NumInstructions; i++) {
-      struct prog_instruction *inst = prog->Instructions + i;
-      const GLuint n = _mesa_num_inst_src_regs(inst->Opcode);
-
-      (void) n;
-
-      if (_mesa_is_tex_instruction(inst->Opcode)) {
-#if 0
-         /* replace TEX/TXP/TXB with MOV */
-         inst->Opcode = OPCODE_MOV;
-         inst->DstReg.WriteMask = WRITEMASK_XYZW;
-         inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
-         inst->SrcReg[0].Negate = NEGATE_NONE;
-#endif
-
-#if 0
-         /* disable shadow texture mode */
-         inst->TexShadow = 0;
-#endif
-      }
-
-      if (inst->Opcode == OPCODE_TXP) {
-#if 0
-         inst->Opcode = OPCODE_MOV;
-         inst->DstReg.WriteMask = WRITEMASK_XYZW;
-         inst->SrcReg[0].File = PROGRAM_CONSTANT;
-         inst->SrcReg[0].Index = whiteIndex;
-         inst->SrcReg[0].Swizzle = SWIZZLE_XYZW;
-         inst->SrcReg[0].Negate = NEGATE_NONE;
-#endif
-#if 0
-         inst->TexShadow = 0;
-#endif
-#if 0
-         inst->Opcode = OPCODE_TEX;
-         inst->TexShadow = 0;
-#endif
-      }
-
-   }
-}
+/*

+ * 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 program.c

+ * Vertex and fragment program support functions.

+ * \author Brian Paul

+ */

+

+

+#include "main/glheader.h"

+#include "main/context.h"

+#include "main/hash.h"

+#include "program.h"

+#include "prog_cache.h"

+#include "prog_parameter.h"

+#include "prog_instruction.h"

+

+

+/**

+ * A pointer to this dummy program is put into the hash table when

+ * glGenPrograms is called.

+ */

+struct gl_program _mesa_DummyProgram;

+

+

+/**

+ * Init context's vertex/fragment program state

+ */

+void

+_mesa_init_program(struct gl_context *ctx)

+{

+   GLuint i;

+

+   /*

+    * If this assertion fails, we need to increase the field

+    * size for register indexes (see INST_INDEX_BITS).

+    */

+   ASSERT(ctx->Const.VertexProgram.MaxUniformComponents / 4

+          <= (1 << INST_INDEX_BITS));

+   ASSERT(ctx->Const.FragmentProgram.MaxUniformComponents / 4

+          <= (1 << INST_INDEX_BITS));

+

+   ASSERT(ctx->Const.VertexProgram.MaxTemps <= (1 << INST_INDEX_BITS));

+   ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= (1 << INST_INDEX_BITS));

+   ASSERT(ctx->Const.FragmentProgram.MaxTemps <= (1 << INST_INDEX_BITS));

+   ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= (1 << INST_INDEX_BITS));

+

+   ASSERT(ctx->Const.VertexProgram.MaxUniformComponents <= 4 * MAX_UNIFORMS);

+   ASSERT(ctx->Const.FragmentProgram.MaxUniformComponents <= 4 * MAX_UNIFORMS);

+

+   /* If this fails, increase prog_instruction::TexSrcUnit size */

+   ASSERT(MAX_TEXTURE_UNITS < (1 << 5));

+

+   /* If this fails, increase prog_instruction::TexSrcTarget size */

+   ASSERT(NUM_TEXTURE_TARGETS < (1 << 3));

+

+   ctx->Program.ErrorPos = -1;

+   ctx->Program.ErrorString = _mesa_strdup("");

+

+#if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program

+   ctx->VertexProgram.Enabled = GL_FALSE;

+#if FEATURE_es2_glsl

+   ctx->VertexProgram.PointSizeEnabled =

+      (ctx->API == API_OPENGLES2) ? GL_TRUE : GL_FALSE;

+#else

+   ctx->VertexProgram.PointSizeEnabled = GL_FALSE;

+#endif

+   ctx->VertexProgram.TwoSideEnabled = GL_FALSE;

+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,

+                            ctx->Shared->DefaultVertexProgram);

+   assert(ctx->VertexProgram.Current);

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

+      ctx->VertexProgram.TrackMatrix[i] = GL_NONE;

+      ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;

+   }

+   ctx->VertexProgram.Cache = _mesa_new_program_cache();

+#endif

+

+#if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program

+   ctx->FragmentProgram.Enabled = GL_FALSE;

+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,

+                            ctx->Shared->DefaultFragmentProgram);

+   assert(ctx->FragmentProgram.Current);

+   ctx->FragmentProgram.Cache = _mesa_new_program_cache();

+#endif

+

+#if FEATURE_ARB_geometry_shader4

+   ctx->GeometryProgram.Enabled = GL_FALSE;

+   /* right now by default we don't have a geometry program */

+   _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current,

+                            NULL);

+   ctx->GeometryProgram.Cache = _mesa_new_program_cache();

+#endif

+

+   /* XXX probably move this stuff */

+#if FEATURE_ATI_fragment_shader

+   ctx->ATIFragmentShader.Enabled = GL_FALSE;

+   ctx->ATIFragmentShader.Current = ctx->Shared->DefaultFragmentShader;

+   assert(ctx->ATIFragmentShader.Current);

+   ctx->ATIFragmentShader.Current->RefCount++;

+#endif

+}

+

+

+/**

+ * Free a context's vertex/fragment program state

+ */

+void

+_mesa_free_program_data(struct gl_context *ctx)

+{

+#if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program

+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);

+   _mesa_delete_program_cache(ctx, ctx->VertexProgram.Cache);

+#endif

+#if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program

+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);

+   _mesa_delete_program_cache(ctx, ctx->FragmentProgram.Cache);

+#endif

+#if FEATURE_ARB_geometry_shader4

+   _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current, NULL);

+   _mesa_delete_program_cache(ctx, ctx->GeometryProgram.Cache);

+#endif

+   /* XXX probably move this stuff */

+#if FEATURE_ATI_fragment_shader

+   if (ctx->ATIFragmentShader.Current) {

+      ctx->ATIFragmentShader.Current->RefCount--;

+      if (ctx->ATIFragmentShader.Current->RefCount <= 0) {

+         free(ctx->ATIFragmentShader.Current);

+      }

+   }

+#endif

+   free((void *) ctx->Program.ErrorString);

+}

+

+

+/**

+ * Update the default program objects in the given context to reference those

+ * specified in the shared state and release those referencing the old

+ * shared state.

+ */

+void

+_mesa_update_default_objects_program(struct gl_context *ctx)

+{

+#if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program

+   _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current,

+                            (struct gl_vertex_program *)

+                            ctx->Shared->DefaultVertexProgram);

+   assert(ctx->VertexProgram.Current);

+#endif

+

+#if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program

+   _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current,

+                            (struct gl_fragment_program *)

+                            ctx->Shared->DefaultFragmentProgram);

+   assert(ctx->FragmentProgram.Current);

+#endif

+

+#if FEATURE_ARB_geometry_shader4

+   _mesa_reference_geomprog(ctx, &ctx->GeometryProgram.Current,

+                            (struct gl_geometry_program *)

+                            ctx->Shared->DefaultGeometryProgram);

+#endif

+

+   /* XXX probably move this stuff */

+#if FEATURE_ATI_fragment_shader

+   if (ctx->ATIFragmentShader.Current) {

+      ctx->ATIFragmentShader.Current->RefCount--;

+      if (ctx->ATIFragmentShader.Current->RefCount <= 0) {

+         free(ctx->ATIFragmentShader.Current);

+      }

+   }

+   ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;

+   assert(ctx->ATIFragmentShader.Current);

+   ctx->ATIFragmentShader.Current->RefCount++;

+#endif

+}

+

+

+/**

+ * Set the vertex/fragment program error state (position and error string).

+ * This is generally called from within the parsers.

+ */

+void

+_mesa_set_program_error(struct gl_context *ctx, GLint pos, const char *string)

+{

+   ctx->Program.ErrorPos = pos;

+   free((void *) ctx->Program.ErrorString);

+   if (!string)

+      string = "";

+   ctx->Program.ErrorString = _mesa_strdup(string);

+}

+

+

+/**

+ * Find the line number and column for 'pos' within 'string'.

+ * Return a copy of the line which contains 'pos'.  Free the line with

+ * free().

+ * \param string  the program string

+ * \param pos     the position within the string

+ * \param line    returns the line number corresponding to 'pos'.

+ * \param col     returns the column number corresponding to 'pos'.

+ * \return copy of the line containing 'pos'.

+ */

+const GLubyte *

+_mesa_find_line_column(const GLubyte *string, const GLubyte *pos,

+                       GLint *line, GLint *col)

+{

+   const GLubyte *lineStart = string;

+   const GLubyte *p = string;

+   GLubyte *s;

+   int len;

+

+   *line = 1;

+

+   while (p != pos) {

+      if (*p == (GLubyte) '\n') {

+         (*line)++;

+         lineStart = p + 1;

+      }

+      p++;

+   }

+

+   *col = (pos - lineStart) + 1;

+

+   /* return copy of this line */

+   while (*p != 0 && *p != '\n')

+      p++;

+   len = p - lineStart;

+   s = (GLubyte *) malloc(len + 1);

+   memcpy(s, lineStart, len);

+   s[len] = 0;

+

+   return s;

+}

+

+

+/**

+ * Initialize a new vertex/fragment program object.

+ */

+static struct gl_program *

+_mesa_init_program_struct( struct gl_context *ctx, struct gl_program *prog,

+                           GLenum target, GLuint id)

+{

+   (void) ctx;

+   if (prog) {

+      GLuint i;

+      memset(prog, 0, sizeof(*prog));

+      prog->Id = id;

+      prog->Target = target;

+      prog->Resident = GL_TRUE;

+      prog->RefCount = 1;

+      prog->Format = GL_PROGRAM_FORMAT_ASCII_ARB;

+

+      /* default mapping from samplers to texture units */

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

+         prog->SamplerUnits[i] = i;

+   }

+

+   return prog;

+}

+

+

+/**

+ * Initialize a new fragment program object.

+ */

+struct gl_program *

+_mesa_init_fragment_program( struct gl_context *ctx, struct gl_fragment_program *prog,

+                             GLenum target, GLuint id)

+{

+   if (prog)

+      return _mesa_init_program_struct( ctx, &prog->Base, target, id );

+   else

+      return NULL;

+}

+

+

+/**

+ * Initialize a new vertex program object.

+ */

+struct gl_program *

+_mesa_init_vertex_program( struct gl_context *ctx, struct gl_vertex_program *prog,

+                           GLenum target, GLuint id)

+{

+   if (prog)

+      return _mesa_init_program_struct( ctx, &prog->Base, target, id );

+   else

+      return NULL;

+}

+

+

+/**

+ * Initialize a new geometry program object.

+ */

+struct gl_program *

+_mesa_init_geometry_program( struct gl_context *ctx, struct gl_geometry_program *prog,

+                             GLenum target, GLuint id)

+{

+   if (prog)

+      return _mesa_init_program_struct( ctx, &prog->Base, target, id );

+   else

+      return NULL;

+}

+

+

+/**

+ * Allocate and initialize a new fragment/vertex program object but

+ * don't put it into the program hash table.  Called via

+ * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a

+ * device driver function to implement OO deriviation with additional

+ * types not understood by this function.

+ *

+ * \param ctx  context

+ * \param id   program id/number

+ * \param target  program target/type

+ * \return  pointer to new program object

+ */

+struct gl_program *

+_mesa_new_program(struct gl_context *ctx, GLenum target, GLuint id)

+{

+   struct gl_program *prog;

+   switch (target) {

+   case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */

+   case GL_VERTEX_STATE_PROGRAM_NV:

+      prog = _mesa_init_vertex_program(ctx, CALLOC_STRUCT(gl_vertex_program),

+                                       target, id );

+      break;

+   case GL_FRAGMENT_PROGRAM_NV:

+   case GL_FRAGMENT_PROGRAM_ARB:

+      prog =_mesa_init_fragment_program(ctx,

+                                         CALLOC_STRUCT(gl_fragment_program),

+                                         target, id );

+      break;

+   case MESA_GEOMETRY_PROGRAM:

+      prog = _mesa_init_geometry_program(ctx,

+                                         CALLOC_STRUCT(gl_geometry_program),

+                                         target, id);

+      break;

+   default:

+      _mesa_problem(ctx, "bad target in _mesa_new_program");

+      prog = NULL;

+   }

+   return prog;

+}

+

+

+/**

+ * Delete a program and remove it from the hash table, ignoring the

+ * reference count.

+ * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)

+ * by a device driver function.

+ */

+void

+_mesa_delete_program(struct gl_context *ctx, struct gl_program *prog)

+{

+   (void) ctx;

+   ASSERT(prog);

+   ASSERT(prog->RefCount==0);

+

+   if (prog == &_mesa_DummyProgram)

+      return;

+

+   if (prog->String)

+      free(prog->String);

+

+   _mesa_free_instructions(prog->Instructions, prog->NumInstructions);

+

+   if (prog->Parameters) {

+      _mesa_free_parameter_list(prog->Parameters);

+   }

+   if (prog->Varying) {

+      _mesa_free_parameter_list(prog->Varying);

+   }

+   if (prog->Attributes) {

+      _mesa_free_parameter_list(prog->Attributes);

+   }

+

+   free(prog);

+}

+

+

+/**

+ * Return the gl_program object for a given ID.

+ * Basically just a wrapper for _mesa_HashLookup() to avoid a lot of

+ * casts elsewhere.

+ */

+struct gl_program *

+_mesa_lookup_program(struct gl_context *ctx, GLuint id)

+{

+   if (id)

+      return (struct gl_program *) _mesa_HashLookup(ctx->Shared->Programs, id);

+   else

+      return NULL;

+}

+

+

+/**

+ * Reference counting for vertex/fragment programs

+ */

+void

+_mesa_reference_program(struct gl_context *ctx,

+                        struct gl_program **ptr,

+                        struct gl_program *prog)

+{

+   assert(ptr);

+   if (*ptr && prog) {

+      /* sanity check */

+      if ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB)

+         ASSERT(prog->Target == GL_VERTEX_PROGRAM_ARB);

+      else if ((*ptr)->Target == GL_FRAGMENT_PROGRAM_ARB)

+         ASSERT(prog->Target == GL_FRAGMENT_PROGRAM_ARB ||

+                prog->Target == GL_FRAGMENT_PROGRAM_NV);

+      else if ((*ptr)->Target == MESA_GEOMETRY_PROGRAM)

+         ASSERT(prog->Target == MESA_GEOMETRY_PROGRAM);

+   }

+   if (*ptr == prog) {

+      return;  /* no change */

+   }

+   if (*ptr) {

+      GLboolean deleteFlag;

+

+      /*_glthread_LOCK_MUTEX((*ptr)->Mutex);*/

+#if 0

+      printf("Program %p ID=%u Target=%s  Refcount-- to %d\n",

+             *ptr, (*ptr)->Id,

+             ((*ptr)->Target == GL_VERTEX_PROGRAM_ARB ? "VP" :

+              ((*ptr)->Target == MESA_GEOMETRY_PROGRAM ? "GP" : "FP")),

+             (*ptr)->RefCount - 1);

+#endif

+      ASSERT((*ptr)->RefCount > 0);

+      (*ptr)->RefCount--;

+

+      deleteFlag = ((*ptr)->RefCount == 0);

+      /*_glthread_UNLOCK_MUTEX((*ptr)->Mutex);*/

+

+      if (deleteFlag) {

+         ASSERT(ctx);

+         ctx->Driver.DeleteProgram(ctx, *ptr);

+      }

+

+      *ptr = NULL;

+   }

+

+   assert(!*ptr);

+   if (prog) {

+      /*_glthread_LOCK_MUTEX(prog->Mutex);*/

+      prog->RefCount++;

+#if 0

+      printf("Program %p ID=%u Target=%s  Refcount++ to %d\n",

+             prog, prog->Id,

+             (prog->Target == GL_VERTEX_PROGRAM_ARB ? "VP" :

+              (prog->Target == MESA_GEOMETRY_PROGRAM ? "GP" : "FP")),

+             prog->RefCount);

+#endif

+      /*_glthread_UNLOCK_MUTEX(prog->Mutex);*/

+   }

+

+   *ptr = prog;

+}

+

+

+/**

+ * Return a copy of a program.

+ * XXX Problem here if the program object is actually OO-derivation

+ * made by a device driver.

+ */

+struct gl_program *

+_mesa_clone_program(struct gl_context *ctx, const struct gl_program *prog)

+{

+   struct gl_program *clone;

+

+   clone = ctx->Driver.NewProgram(ctx, prog->Target, prog->Id);

+   if (!clone)

+      return NULL;

+

+   assert(clone->Target == prog->Target);

+   assert(clone->RefCount == 1);

+

+   clone->String = (GLubyte *) _mesa_strdup((char *) prog->String);

+   clone->Format = prog->Format;

+   clone->Instructions = _mesa_alloc_instructions(prog->NumInstructions);

+   if (!clone->Instructions) {

+      _mesa_reference_program(ctx, &clone, NULL);

+      return NULL;

+   }

+   _mesa_copy_instructions(clone->Instructions, prog->Instructions,

+                           prog->NumInstructions);

+   clone->InputsRead = prog->InputsRead;

+   clone->OutputsWritten = prog->OutputsWritten;

+   clone->SamplersUsed = prog->SamplersUsed;

+   clone->ShadowSamplers = prog->ShadowSamplers;

+   memcpy(clone->TexturesUsed, prog->TexturesUsed, sizeof(prog->TexturesUsed));

+

+   if (prog->Parameters)

+      clone->Parameters = _mesa_clone_parameter_list(prog->Parameters);

+   memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));

+   if (prog->Varying)

+      clone->Varying = _mesa_clone_parameter_list(prog->Varying);

+   if (prog->Attributes)

+      clone->Attributes = _mesa_clone_parameter_list(prog->Attributes);

+   memcpy(clone->LocalParams, prog->LocalParams, sizeof(clone->LocalParams));

+   clone->IndirectRegisterFiles = prog->IndirectRegisterFiles;

+   clone->NumInstructions = prog->NumInstructions;

+   clone->NumTemporaries = prog->NumTemporaries;

+   clone->NumParameters = prog->NumParameters;

+   clone->NumAttributes = prog->NumAttributes;

+   clone->NumAddressRegs = prog->NumAddressRegs;

+   clone->NumNativeInstructions = prog->NumNativeInstructions;

+   clone->NumNativeTemporaries = prog->NumNativeTemporaries;

+   clone->NumNativeParameters = prog->NumNativeParameters;

+   clone->NumNativeAttributes = prog->NumNativeAttributes;

+   clone->NumNativeAddressRegs = prog->NumNativeAddressRegs;

+   clone->NumAluInstructions = prog->NumAluInstructions;

+   clone->NumTexInstructions = prog->NumTexInstructions;

+   clone->NumTexIndirections = prog->NumTexIndirections;

+   clone->NumNativeAluInstructions = prog->NumNativeAluInstructions;

+   clone->NumNativeTexInstructions = prog->NumNativeTexInstructions;

+   clone->NumNativeTexIndirections = prog->NumNativeTexIndirections;

+

+   switch (prog->Target) {

+   case GL_VERTEX_PROGRAM_ARB:

+      {

+         const struct gl_vertex_program *vp

+            = (const struct gl_vertex_program *) prog;

+         struct gl_vertex_program *vpc = (struct gl_vertex_program *) clone;

+         vpc->IsPositionInvariant = vp->IsPositionInvariant;

+         vpc->IsNVProgram = vp->IsNVProgram;

+      }

+      break;

+   case GL_FRAGMENT_PROGRAM_ARB:

+      {

+         const struct gl_fragment_program *fp

+            = (const struct gl_fragment_program *) prog;

+         struct gl_fragment_program *fpc = (struct gl_fragment_program *) clone;

+         fpc->FogOption = fp->FogOption;

+         fpc->UsesKill = fp->UsesKill;

+         fpc->OriginUpperLeft = fp->OriginUpperLeft;

+         fpc->PixelCenterInteger = fp->PixelCenterInteger;

+      }

+      break;

+   case MESA_GEOMETRY_PROGRAM:

+      {

+         const struct gl_geometry_program *gp

+            = (const struct gl_geometry_program *) prog;

+         struct gl_geometry_program *gpc = (struct gl_geometry_program *) clone;

+         gpc->VerticesOut = gp->VerticesOut;

+         gpc->InputType = gp->InputType;

+         gpc->OutputType = gp->OutputType;

+      }

+      break;

+   default:

+      _mesa_problem(NULL, "Unexpected target in _mesa_clone_program");

+   }

+

+   return clone;

+}

+

+

+/**

+ * Insert 'count' NOP instructions at 'start' in the given program.

+ * Adjust branch targets accordingly.

+ */

+GLboolean

+_mesa_insert_instructions(struct gl_program *prog, GLuint start, GLuint count)

+{

+   const GLuint origLen = prog->NumInstructions;

+   const GLuint newLen = origLen + count;

+   struct prog_instruction *newInst;

+   GLuint i;

+

+   /* adjust branches */

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

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

+      if (inst->BranchTarget > 0) {

+         if ((GLuint)inst->BranchTarget >= start) {

+            inst->BranchTarget += count;

+         }

+      }

+   }

+

+   /* Alloc storage for new instructions */

+   newInst = _mesa_alloc_instructions(newLen);

+   if (!newInst) {

+      return GL_FALSE;

+   }

+

+   /* Copy 'start' instructions into new instruction buffer */

+   _mesa_copy_instructions(newInst, prog->Instructions, start);

+

+   /* init the new instructions */

+   _mesa_init_instructions(newInst + start, count);

+

+   /* Copy the remaining/tail instructions to new inst buffer */

+   _mesa_copy_instructions(newInst + start + count,

+                           prog->Instructions + start,

+                           origLen - start);

+

+   /* free old instructions */

+   _mesa_free_instructions(prog->Instructions, origLen);

+

+   /* install new instructions */

+   prog->Instructions = newInst;

+   prog->NumInstructions = newLen;

+

+   return GL_TRUE;

+}

+

+/**

+ * Delete 'count' instructions at 'start' in the given program.

+ * Adjust branch targets accordingly.

+ */

+GLboolean

+_mesa_delete_instructions(struct gl_program *prog, GLuint start, GLuint count)

+{

+   const GLuint origLen = prog->NumInstructions;

+   const GLuint newLen = origLen - count;

+   struct prog_instruction *newInst;

+   GLuint i;

+

+   /* adjust branches */

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

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

+      if (inst->BranchTarget > 0) {

+         if (inst->BranchTarget > (GLint) start) {

+            inst->BranchTarget -= count;

+         }

+      }

+   }

+

+   /* Alloc storage for new instructions */

+   newInst = _mesa_alloc_instructions(newLen);

+   if (!newInst) {

+      return GL_FALSE;

+   }

+

+   /* Copy 'start' instructions into new instruction buffer */

+   _mesa_copy_instructions(newInst, prog->Instructions, start);

+

+   /* Copy the remaining/tail instructions to new inst buffer */

+   _mesa_copy_instructions(newInst + start,

+                           prog->Instructions + start + count,

+                           newLen - start);

+

+   /* free old instructions */

+   _mesa_free_instructions(prog->Instructions, origLen);

+

+   /* install new instructions */

+   prog->Instructions = newInst;

+   prog->NumInstructions = newLen;

+

+   return GL_TRUE;

+}

+

+

+/**

+ * Search instructions for registers that match (oldFile, oldIndex),

+ * replacing them with (newFile, newIndex).

+ */

+static void

+replace_registers(struct prog_instruction *inst, GLuint numInst,

+                  GLuint oldFile, GLuint oldIndex,

+                  GLuint newFile, GLuint newIndex)

+{

+   GLuint i, j;

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

+      /* src regs */

+      for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {

+         if (inst[i].SrcReg[j].File == oldFile &&

+             inst[i].SrcReg[j].Index == oldIndex) {

+            inst[i].SrcReg[j].File = newFile;

+            inst[i].SrcReg[j].Index = newIndex;

+         }

+      }

+      /* dst reg */

+      if (inst[i].DstReg.File == oldFile && inst[i].DstReg.Index == oldIndex) {

+         inst[i].DstReg.File = newFile;

+         inst[i].DstReg.Index = newIndex;

+      }

+   }

+}

+

+

+/**

+ * Search instructions for references to program parameters.  When found,

+ * increment the parameter index by 'offset'.

+ * Used when combining programs.

+ */

+static void

+adjust_param_indexes(struct prog_instruction *inst, GLuint numInst,

+                     GLuint offset)

+{

+   GLuint i, j;

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

+      for (j = 0; j < _mesa_num_inst_src_regs(inst[i].Opcode); j++) {

+         GLuint f = inst[i].SrcReg[j].File;

+         if (f == PROGRAM_CONSTANT ||

+             f == PROGRAM_UNIFORM ||

+             f == PROGRAM_STATE_VAR) {

+            inst[i].SrcReg[j].Index += offset;

+         }

+      }

+   }

+}

+

+

+/**

+ * Combine two programs into one.  Fix instructions so the outputs of

+ * the first program go to the inputs of the second program.

+ */

+struct gl_program *

+_mesa_combine_programs(struct gl_context *ctx,

+                       const struct gl_program *progA,

+                       const struct gl_program *progB)

+{

+   struct prog_instruction *newInst;

+   struct gl_program *newProg;

+   const GLuint lenA = progA->NumInstructions - 1; /* omit END instr */

+   const GLuint lenB = progB->NumInstructions;

+   const GLuint numParamsA = _mesa_num_parameters(progA->Parameters);

+   const GLuint newLength = lenA + lenB;

+   GLboolean usedTemps[MAX_PROGRAM_TEMPS];

+   GLuint firstTemp = 0;

+   GLbitfield inputsB;

+   GLuint i;

+

+   ASSERT(progA->Target == progB->Target);

+

+   newInst = _mesa_alloc_instructions(newLength);

+   if (!newInst)

+      return GL_FALSE;

+

+   _mesa_copy_instructions(newInst, progA->Instructions, lenA);

+   _mesa_copy_instructions(newInst + lenA, progB->Instructions, lenB);

+

+   /* adjust branch / instruction addresses for B's instructions */

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

+      newInst[lenA + i].BranchTarget += lenA;

+   }

+

+   newProg = ctx->Driver.NewProgram(ctx, progA->Target, 0);

+   newProg->Instructions = newInst;

+   newProg->NumInstructions = newLength;

+

+   /* find used temp regs (we may need new temps below) */

+   _mesa_find_used_registers(newProg, PROGRAM_TEMPORARY,

+                             usedTemps, MAX_PROGRAM_TEMPS);

+

+   if (newProg->Target == GL_FRAGMENT_PROGRAM_ARB) {

+      struct gl_fragment_program *fprogA, *fprogB, *newFprog;

+      GLbitfield progB_inputsRead = progB->InputsRead;

+      GLint progB_colorFile, progB_colorIndex;

+

+      fprogA = (struct gl_fragment_program *) progA;

+      fprogB = (struct gl_fragment_program *) progB;

+      newFprog = (struct gl_fragment_program *) newProg;

+

+      newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;

+

+      /* We'll do a search and replace for instances

+       * of progB_colorFile/progB_colorIndex below...

+       */

+      progB_colorFile = PROGRAM_INPUT;

+      progB_colorIndex = FRAG_ATTRIB_COL0;

+

+      /*

+       * The fragment program may get color from a state var rather than

+       * a fragment input (vertex output) if it's constant.

+       * See the texenvprogram.c code.

+       * So, search the program's parameter list now to see if the program

+       * gets color from a state var instead of a conventional fragment

+       * input register.

+       */

+      for (i = 0; i < progB->Parameters->NumParameters; i++) {

+         struct gl_program_parameter *p = &progB->Parameters->Parameters[i];

+         if (p->Type == PROGRAM_STATE_VAR &&

+             p->StateIndexes[0] == STATE_INTERNAL &&

+             p->StateIndexes[1] == STATE_CURRENT_ATTRIB &&

+             (int) p->StateIndexes[2] == (int) VERT_ATTRIB_COLOR0) {

+            progB_inputsRead |= FRAG_BIT_COL0;

+            progB_colorFile = PROGRAM_STATE_VAR;

+            progB_colorIndex = i;

+            break;

+         }

+      }

+

+      /* Connect color outputs of fprogA to color inputs of fprogB, via a

+       * new temporary register.

+       */

+      if ((progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) &&

+          (progB_inputsRead & FRAG_BIT_COL0)) {

+         GLint tempReg = _mesa_find_free_register(usedTemps, MAX_PROGRAM_TEMPS,

+                                                  firstTemp);

+         if (tempReg < 0) {

+            _mesa_problem(ctx, "No free temp regs found in "

+                          "_mesa_combine_programs(), using 31");

+            tempReg = 31;

+         }

+         firstTemp = tempReg + 1;

+

+         /* replace writes to result.color[0] with tempReg */

+         replace_registers(newInst, lenA,

+                           PROGRAM_OUTPUT, FRAG_RESULT_COLOR,

+                           PROGRAM_TEMPORARY, tempReg);

+         /* replace reads from the input color with tempReg */

+         replace_registers(newInst + lenA, lenB,

+                           progB_colorFile, progB_colorIndex, /* search for */

+                           PROGRAM_TEMPORARY, tempReg  /* replace with */ );

+      }

+

+      /* compute combined program's InputsRead */

+      inputsB = progB_inputsRead;

+      if (progA->OutputsWritten & (1 << FRAG_RESULT_COLOR)) {

+         inputsB &= ~(1 << FRAG_ATTRIB_COL0);

+      }

+      newProg->InputsRead = progA->InputsRead | inputsB;

+      newProg->OutputsWritten = progB->OutputsWritten;

+      newProg->SamplersUsed = progA->SamplersUsed | progB->SamplersUsed;

+   }

+   else {

+      /* vertex program */

+      assert(0);      /* XXX todo */

+   }

+

+   /*

+    * Merge parameters (uniforms, constants, etc)

+    */

+   newProg->Parameters = _mesa_combine_parameter_lists(progA->Parameters,

+                                                       progB->Parameters);

+

+   adjust_param_indexes(newInst + lenA, lenB, numParamsA);

+

+

+   return newProg;

+}

+

+

+/**

+ * Populate the 'used' array with flags indicating which registers (TEMPs,

+ * INPUTs, OUTPUTs, etc, are used by the given program.

+ * \param file  type of register to scan for

+ * \param used  returns true/false flags for in use / free

+ * \param usedSize  size of the 'used' array

+ */

+void

+_mesa_find_used_registers(const struct gl_program *prog,

+                          gl_register_file file,

+                          GLboolean used[], GLuint usedSize)

+{

+   GLuint i, j;

+

+   memset(used, 0, usedSize);

+

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

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

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

+

+      if (inst->DstReg.File == file) {

+         ASSERT(inst->DstReg.Index < usedSize);

+         if(inst->DstReg.Index < usedSize)

+            used[inst->DstReg.Index] = GL_TRUE;

+      }

+

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

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

+            ASSERT(inst->SrcReg[j].Index < usedSize);

+            if(inst->SrcReg[j].Index < usedSize)

+               used[inst->SrcReg[j].Index] = GL_TRUE;

+         }

+      }

+   }

+}

+

+

+/**

+ * Scan the given 'used' register flag array for the first entry

+ * that's >= firstReg.

+ * \param used  vector of flags indicating registers in use (as returned

+ *              by _mesa_find_used_registers())

+ * \param usedSize  size of the 'used' array

+ * \param firstReg  first register to start searching at

+ * \return index of unused register, or -1 if none.

+ */

+GLint

+_mesa_find_free_register(const GLboolean used[],

+                         GLuint usedSize, GLuint firstReg)

+{

+   GLuint i;

+

+   assert(firstReg < usedSize);

+

+   for (i = firstReg; i < usedSize; i++)

+      if (!used[i])

+         return i;

+

+   return -1;

+}

+

+

+

+/**

+ * Check if the given register index is valid (doesn't exceed implementation-

+ * dependent limits).

+ * \return GL_TRUE if OK, GL_FALSE if bad index

+ */

+GLboolean

+_mesa_valid_register_index(const struct gl_context *ctx,

+                           gl_shader_type shaderType,

+                           gl_register_file file, GLint index)

+{

+   const struct gl_program_constants *c;

+

+   switch (shaderType) {

+   case MESA_SHADER_VERTEX:

+      c = &ctx->Const.VertexProgram;

+      break;

+   case MESA_SHADER_FRAGMENT:

+      c = &ctx->Const.FragmentProgram;

+      break;

+   case MESA_SHADER_GEOMETRY:

+      c = &ctx->Const.GeometryProgram;

+      break;

+   default:

+      _mesa_problem(ctx,

+                    "unexpected shader type in _mesa_valid_register_index()");

+      return GL_FALSE;

+   }

+

+   switch (file) {

+   case PROGRAM_UNDEFINED:

+      return GL_TRUE;  /* XXX or maybe false? */

+

+   case PROGRAM_TEMPORARY:

+      return index >= 0 && index < c->MaxTemps;

+

+   case PROGRAM_ENV_PARAM:

+      return index >= 0 && index < c->MaxEnvParams;

+

+   case PROGRAM_LOCAL_PARAM:

+      return index >= 0 && index < c->MaxLocalParams;

+

+   case PROGRAM_NAMED_PARAM:

+      return index >= 0 && index < c->MaxParameters;

+

+   case PROGRAM_UNIFORM:

+   case PROGRAM_STATE_VAR:

+      /* aka constant buffer */

+      return index >= 0 && index < c->MaxUniformComponents / 4;

+

+   case PROGRAM_CONSTANT:

+      /* constant buffer w/ possible relative negative addressing */

+      return (index > (int) c->MaxUniformComponents / -4 &&

+              index < c->MaxUniformComponents / 4);

+

+   case PROGRAM_INPUT:

+      if (index < 0)

+         return GL_FALSE;

+

+      switch (shaderType) {

+      case MESA_SHADER_VERTEX:

+         return index < VERT_ATTRIB_GENERIC0 + c->MaxAttribs;

+      case MESA_SHADER_FRAGMENT:

+         return index < FRAG_ATTRIB_VAR0 + ctx->Const.MaxVarying;

+      case MESA_SHADER_GEOMETRY:

+         return index < GEOM_ATTRIB_VAR0 + ctx->Const.MaxVarying;

+      default:

+         return GL_FALSE;

+      }

+

+   case PROGRAM_OUTPUT:

+      if (index < 0)

+         return GL_FALSE;

+

+      switch (shaderType) {

+      case MESA_SHADER_VERTEX:

+         return index < VERT_RESULT_VAR0 + ctx->Const.MaxVarying;

+      case MESA_SHADER_FRAGMENT:

+         return index < FRAG_RESULT_DATA0 + ctx->Const.MaxDrawBuffers;

+      case MESA_SHADER_GEOMETRY:

+         return index < GEOM_RESULT_VAR0 + ctx->Const.MaxVarying;

+      default:

+         return GL_FALSE;

+      }

+

+   case PROGRAM_ADDRESS:

+      return index >= 0 && index < c->MaxAddressRegs;

+

+   default:

+      _mesa_problem(ctx,

+                    "unexpected register file in _mesa_valid_register_index()");

+      return GL_FALSE;

+   }

+}

+

+

+

+/**

+ * "Post-process" a GPU program.  This is intended to be used for debugging.

+ * Example actions include no-op'ing instructions or changing instruction

+ * behaviour.

+ */

+void

+_mesa_postprocess_program(struct gl_context *ctx, struct gl_program *prog)

+{

+   static const GLfloat white[4] = { 0.5, 0.5, 0.5, 0.5 };

+   GLuint i;

+   GLuint whiteSwizzle;

+   GLint whiteIndex = _mesa_add_unnamed_constant(prog->Parameters,

+                                                 white, 4, &whiteSwizzle);

+

+   (void) whiteIndex;

+

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

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

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

+

+      (void) n;

+

+      if (_mesa_is_tex_instruction(inst->Opcode)) {

+#if 0

+         /* replace TEX/TXP/TXB with MOV */

+         inst->Opcode = OPCODE_MOV;

+         inst->DstReg.WriteMask = WRITEMASK_XYZW;

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

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

+#endif

+

+#if 0

+         /* disable shadow texture mode */

+         inst->TexShadow = 0;

+#endif

+      }

+

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

+#if 0

+         inst->Opcode = OPCODE_MOV;

+         inst->DstReg.WriteMask = WRITEMASK_XYZW;

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

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

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

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

+#endif

+#if 0

+         inst->TexShadow = 0;

+#endif

+#if 0

+         inst->Opcode = OPCODE_TEX;

+         inst->TexShadow = 0;

+#endif

+      }

+

+   }

+}