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/*
* Mesa 3-D graphics library
* Version: 6.5.1
*
* Copyright (C) 1999-2006 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 "glheader.h"
#include "context.h"
#include "imports.h"
#include "mtypes.h"
#include "program.h"
#include "programopt.h"
#include "program_instruction.h"
/**
* This is used for helping with position-invariant vertex programs.
* It appends extra instructions to the given program to do the
* vertex position transformation (multiply by the MVP matrix).
*/
void
_mesa_append_modelview_code(GLcontext *ctx, struct gl_vertex_program *vprog)
{
struct prog_instruction newInst[5];
const GLuint origLen = vprog->Base.NumInstructions;
GLuint i;
/*
* Setup state references for the modelview/projection matrix.
* XXX we should check if these state vars are already declared.
*/
static const GLint mvpState[4][5] = {
{ STATE_MATRIX, STATE_MVP, 0, 0, 0 }, /* state.matrix.mvp.row[0] */
{ STATE_MATRIX, STATE_MVP, 0, 1, 1 }, /* state.matrix.mvp.row[1] */
{ STATE_MATRIX, STATE_MVP, 0, 2, 2 }, /* state.matrix.mvp.row[2] */
{ STATE_MATRIX, STATE_MVP, 0, 3, 3 }, /* 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]);
}
/*
* 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;
* newInst[4] = END;
*/
for (i = 0; i < 4; i++) {
_mesa_init_instruction(newInst + 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;
}
newInst[4].Opcode = OPCODE_END;
/*
* Append new instructions onto program.
*/
vprog->Base.Instructions
= _mesa_realloc_instructions(vprog->Base.Instructions,
origLen, origLen + 4);
if (!vprog->Base.Instructions) {
_mesa_error(ctx, GL_OUT_OF_MEMORY,
"glProgramString(generating position transformation code)");
return;
}
/* subtract one to overwrite original program's END instruction */
_mesa_memcpy(vprog->Base.Instructions + origLen - 1,
newInst, sizeof(newInst));
vprog->Base.NumInstructions = origLen + 4;
vprog->Base.InputsRead |= VERT_BIT_POS;
vprog->Base.OutputsWritten |= (1 << VERT_RESULT_HPOS);
}
/**
* Append extra instructions onto the given fragment program to implement
* the fog mode specified by program->FogOption.
* XXX incomplete.
*/
void
_mesa_append_fog_code(GLcontext *ctx, struct gl_fragment_program *fprog)
{
struct prog_instruction newInst[10];
switch (fprog->FogOption) {
case GL_LINEAR:
/* lerp */
break;
case GL_EXP:
break;
case GL_EXP2:
break;
case GL_NONE:
/* no-op */
return;
default:
_mesa_problem(ctx, "Invalid fog option");
return;
}
(void) newInst;
}
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