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Use KIL in glBitmap shader to cull the fragments for 0 bits.

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This commit is contained in:
Brian 2007-10-12 16:16:20 -06:00
parent 47fc06753e
commit 89414d951d
1 changed files with 30 additions and 41 deletions
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71
src/mesa/state_tracker/st_cb_drawpixels.c
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@ -66,14 +66,8 @@ make_fragment_shader(struct st_context *st, GLboolean bitmapMode)
if (!p)
return NULL;
#define CULL 1 /* Use KIL to cull 0 bits/pixels in bitmap? */
if (bitmapMode)
#if CULL
p->NumInstructions = 7;
#else
p->NumInstructions = 3;
#endif
p->NumInstructions = 6;
else
p->NumInstructions = 2;
@ -85,14 +79,11 @@ make_fragment_shader(struct st_context *st, GLboolean bitmapMode)
_mesa_init_instructions(p->Instructions, p->NumInstructions);
if (bitmapMode) {
/*
* XXX This is temporary
* We actually need to cull the fragment if the texture value is zero.
* But TGSI doesn't support conditionals yet.
* Also, we need to compose this fragment shader with the current
* XXX, we need to compose this fragment shader with the current
* user-provided fragment shader so the fragment program is applied
* to the fragments which aren't culled.
*/
/* TEX temp0, fragment.texcoord[0], texture[0], 2D; */
/* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
p->Instructions[ic].Opcode = OPCODE_TEX;
p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
p->Instructions[ic].DstReg.Index = 0;
@ -101,13 +92,36 @@ make_fragment_shader(struct st_context *st, GLboolean bitmapMode)
p->Instructions[ic].TexSrcUnit = 0;
p->Instructions[ic].TexSrcTarget = TEXTURE_2D_INDEX;
ic++;
#if CULL
/* IF temp0 */
p->Instructions[ic].Opcode = OPCODE_IF;
/* SWZ tmp0.x, tmp0.x, 1111; # tmp0.x = 1.0 */
p->Instructions[ic].Opcode = OPCODE_SWZ;
p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
p->Instructions[ic].DstReg.Index = 0;
p->Instructions[ic].DstReg.WriteMask = WRITEMASK_X;
p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
p->Instructions[ic].SrcReg[0].Index = 0;
p->Instructions[ic].SrcReg[0].Swizzle
= MAKE_SWIZZLE4(SWIZZLE_ONE, SWIZZLE_ONE, SWIZZLE_ONE, SWIZZLE_ONE );
ic++;
/* SUB tmp0.w, tmp0.w, tmp0.x; # tmp0.w -= 1 */
p->Instructions[ic].Opcode = OPCODE_SUB;
p->Instructions[ic].DstReg.File = PROGRAM_TEMPORARY;
p->Instructions[ic].DstReg.Index = 0;
p->Instructions[ic].DstReg.WriteMask = WRITEMASK_W;
p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
p->Instructions[ic].SrcReg[0].Index = 0;
p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_WWWW;
p->Instructions[ic].SrcReg[1].File = PROGRAM_TEMPORARY;
p->Instructions[ic].SrcReg[1].Index = 0;
p->Instructions[ic].SrcReg[1].Swizzle = SWIZZLE_XXXX; /* 1.0 */
ic++;
/* KIL if tmp0.w < 0 */
p->Instructions[ic].Opcode = OPCODE_KIL;
p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
p->Instructions[ic].SrcReg[0].Index = 0;
p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_WWWW;
p->Instructions[ic].BranchTarget = ic + 2;
ic++;
/* MOV result.color, fragment.color */
@ -117,31 +131,6 @@ make_fragment_shader(struct st_context *st, GLboolean bitmapMode)
p->Instructions[ic].SrcReg[0].File = PROGRAM_INPUT;
p->Instructions[ic].SrcReg[0].Index = FRAG_ATTRIB_COL0;
ic++;
/* ELSE */
p->Instructions[ic].Opcode = OPCODE_ELSE;
p->Instructions[ic].BranchTarget = ic + 2;
ic++;
/* KILL */
p->Instructions[ic].Opcode = OPCODE_KIL_NV;
ic++;
/* ENDIF */
p->Instructions[ic].Opcode = OPCODE_ENDIF;
ic++;
#else
/* MUL result.color, temp0.xxxx, fragment.color */
p->Instructions[ic].Opcode = OPCODE_MUL;
p->Instructions[ic].DstReg.File = PROGRAM_OUTPUT;
p->Instructions[ic].DstReg.Index = FRAG_RESULT_COLR;
p->Instructions[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
p->Instructions[ic].SrcReg[0].Index = 0;
p->Instructions[ic].SrcReg[0].Swizzle = SWIZZLE_WWWW;
p->Instructions[ic].SrcReg[1].File = PROGRAM_INPUT;
p->Instructions[ic].SrcReg[1].Index = FRAG_ATTRIB_COL0;
ic++;
#endif
}
else {
/* DrawPixels mode */