-/**
- * 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) {
- const struct gl_fragment_program *fprogA, *fprogB;
- struct gl_fragment_program *newFprog;
- GLbitfield progB_inputsRead = progB->InputsRead;
- GLint progB_colorFile, progB_colorIndex;
-
- fprogA = gl_fragment_program_const(progA);
- fprogB = gl_fragment_program_const(progB);
- newFprog = gl_fragment_program(newProg);
-
- newFprog->UsesKill = fprogA->UsesKill || fprogB->UsesKill;
- newFprog->UsesDFdy = fprogA->UsesDFdy || fprogB->UsesDFdy;
-
- /* 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 & BITFIELD64_BIT(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 & BITFIELD64_BIT(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;
-}
-
-