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nvfx: properly return fogcoord.w == 1

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Hardware sets it to 0, so we add an ADD to put an 1 there if the
application really wants the alpha channel.
This commit is contained in:
Luca Barbieri
2010-09-05 06:42:04 +02:00
parent 76f696b1f6
commit 14d5805235
1 changed files with 15 additions and 1 deletions
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src/gallium/drivers/nvfx/nvfx_fragprog.c
+15 -1
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@@ -493,7 +493,21 @@ nvfx_fragprog_parse_instruction(struct nvfx_context* nvfx, struct nvfx_fpc *fpc,
switch (fsrc->Register.File) {
case TGSI_FILE_INPUT:
if (ai == -1 || ai == fsrc->Register.Index) {
if(fpc->pfp->info.input_semantic_name[fsrc->Register.Index] == TGSI_SEMANTIC_FOG && (0
|| fsrc->Register.SwizzleX == PIPE_SWIZZLE_ALPHA
|| fsrc->Register.SwizzleY == PIPE_SWIZZLE_ALPHA
|| fsrc->Register.SwizzleZ == PIPE_SWIZZLE_ALPHA
|| fsrc->Register.SwizzleW == PIPE_SWIZZLE_ALPHA
)) {
/* hardware puts 0 in fogcoord.w, but GL/Gallium want 1 there */
struct nvfx_src addend = nvfx_src(nvfx_fp_imm(fpc, 0, 0, 0, 1));
addend.swz[0] = fsrc->Register.SwizzleX;
addend.swz[1] = fsrc->Register.SwizzleY;
addend.swz[2] = fsrc->Register.SwizzleZ;
addend.swz[3] = fsrc->Register.SwizzleW;
src[i] = nvfx_src(temp(fpc));
nvfx_fp_emit(fpc, arith(0, ADD, src[i].reg, NVFX_FP_MASK_ALL, tgsi_src(fpc, fsrc), addend, none));
} else if (ai == -1 || ai == fsrc->Register.Index) {
ai = fsrc->Register.Index;
src[i] = tgsi_src(fpc, fsrc);
} else {