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Implement parsing of texture instructions and prototype execution.

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Misc parser clean-ups.
This commit is contained in:
Brian Paul
2003-02-17 15:38:03 +00:00
parent 2c1912fe84
commit 04cbad84e8
3 changed files with 318 additions and 136 deletions
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107
src/mesa/swrast/s_nvfragprog.c
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@@ -1,4 +1,4 @@
/* $Id: s_nvfragprog.c,v 1.1 2003/01/14 04:57:47 brianp Exp $ */
/* $Id: s_nvfragprog.c,v 1.2 2003/02/17 15:38:04 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -36,6 +36,73 @@
#include "s_nvfragprog.h"
/**
* Fetch a texel.
*/
static void
fetch_texel( GLcontext *ctx, const GLfloat texcoord[4], GLuint unit,
GLenum target, GLfloat color[4] )
{
const struct gl_texture_object *texObj;
/* XXX Use swrast->TextureSample[texUnit]() to sample texture.
* Needs to be swrast->TextureSample[target][texUnit]() though.
*/
switch (target) {
case GL_TEXTURE_1D:
texObj = ctx->Texture.Unit[unit].Current1D;
break;
case GL_TEXTURE_2D:
texObj = ctx->Texture.Unit[unit].Current2D;
break;
case GL_TEXTURE_3D:
texObj = ctx->Texture.Unit[unit].Current3D;
break;
case GL_TEXTURE_CUBE_MAP:
texObj = ctx->Texture.Unit[unit].CurrentCubeMap;
break;
case GL_TEXTURE_RECTANGLE_NV:
texObj = ctx->Texture.Unit[unit].CurrentRect;
break;
default:
_mesa_problem(ctx, "Invalid target in fetch_texel");
}
if (texObj->Complete) {
const struct gl_texture_image *texImage;
GLint col, row, img;
GLchan texel[4];
col = IROUND(texcoord[0] * texImage->Width); /* XXX temporary! */
row = IROUND(texcoord[1] * texImage->Height); /* XXX temporary! */
img = 0;
texImage->FetchTexel(texImage, col, row, img, texel);
/* XXX texture format? */
color[0] = CHAN_TO_FLOAT(texel[0]);
color[1] = CHAN_TO_FLOAT(texel[1]);
color[2] = CHAN_TO_FLOAT(texel[2]);
color[3] = CHAN_TO_FLOAT(texel[3]);
}
else {
ASSIGN_4V(color, 0.0, 0.0, 0.0, 0.0);
}
}
/**
* Fetch a texel w/ partial derivatives.
*/
static void
fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
const GLfloat dtdx[4], const GLfloat dtdy[4],
GLuint unit, GLenum target, GLfloat color[4] )
{
/* XXX to do */
}
/**
* Fetch a 4-element float vector from the given source register.
* Apply swizzling and negating as needed.
@@ -315,6 +382,44 @@ execute_program(GLcontext *ctx, const struct fragment_program *program)
inst->UpdateCondRegister );
}
break;
case FP_OPCODE_TEX:
/* Texel lookup */
{
GLfloat texcoord[4], color[4];
fetch_vector4( &inst->SrcReg[0], machine, texcoord );
fetch_texel( ctx, texcoord, inst->TexSrcUnit,
inst->TexSrcTarget, color );
store_vector4( &inst->DstReg, machine, color, inst->Saturate,
inst->UpdateCondRegister );
}
break;
case FP_OPCODE_TXD:
/* Texture lookup w/ partial derivatives for LOD */
{
GLfloat texcoord[4], dtdx[4], dtdy[4], color[4];
fetch_vector4( &inst->SrcReg[0], machine, texcoord );
fetch_vector4( &inst->SrcReg[1], machine, dtdx );
fetch_vector4( &inst->SrcReg[2], machine, dtdy );
fetch_texel_deriv( ctx, texcoord, dtdx, dtdy, inst->TexSrcUnit,
inst->TexSrcTarget, color );
store_vector4( &inst->DstReg, machine, color, inst->Saturate,
inst->UpdateCondRegister );
}
break;
case FP_OPCODE_TXP:
/* Texture lookup w/ perspective divide */
{
GLfloat texcoord[4], color[4];
fetch_vector4( &inst->SrcReg[0], machine, texcoord );
texcoord[0] /= texcoord[3];
texcoord[1] /= texcoord[3];
texcoord[2] /= texcoord[3];
fetch_texel( ctx, texcoord, inst->TexSrcUnit,
inst->TexSrcTarget, color );
store_vector4( &inst->DstReg, machine, color, inst->Saturate,
inst->UpdateCondRegister );
}
break;
default:
_mesa_problem(ctx, "Bad opcode in _mesa_exec_fragment_program");
return;