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Diffstat (limited to 'mesalib/src/mesa/shader/programopt.c')
| -rw-r--r-- | mesalib/src/mesa/shader/programopt.c | 575 |
1 files changed, 575 insertions, 0 deletions
diff --git a/mesalib/src/mesa/shader/programopt.c b/mesalib/src/mesa/shader/programopt.c new file mode 100644 index 000000000..f70c75cec --- /dev/null +++ b/mesalib/src/mesa/shader/programopt.c @@ -0,0 +1,575 @@ +/* + * 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 |= (1 << 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 |= (1 << 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; + + 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(prog, + PROGRAM_TEMPORARY); + } + 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; + const GLuint numSrc = _mesa_num_inst_src_regs(inst->Opcode); + GLuint j; + for (j = 0; j < numSrc; j++) { + 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++; + } + } + } +} |