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r600g: mask unused source components for SAMPLE

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This results in more clean shader code and may improve the quality of
optimized code produced by r600-sb due to eliminated false dependencies
in some cases.

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
This commit is contained in:
Vadim Girlin
2013-04-25 19:42:31 +04:00
parent df410863d7
commit 7d555f2f4c
1 changed files with 20 additions and 0 deletions
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src/gallium/drivers/r600/r600_shader.c
+20
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@@ -4743,6 +4743,26 @@ static int tgsi_tex(struct r600_shader_ctx *ctx)
/* the array index is read from Z */
tex.coord_type_z = 0;
/* mask unused source components */
if (opcode == FETCH_OP_SAMPLE) {
switch (inst->Texture.Texture) {
case TGSI_TEXTURE_2D:
case TGSI_TEXTURE_RECT:
tex.src_sel_z = 7;
tex.src_sel_w = 7;
break;
case TGSI_TEXTURE_1D_ARRAY:
tex.src_sel_y = 7;
tex.src_sel_w = 7;
break;
case TGSI_TEXTURE_1D:
tex.src_sel_y = 7;
tex.src_sel_z = 7;
tex.src_sel_w = 7;
break;
}
}
r = r600_bytecode_add_tex(ctx->bc, &tex);
if (r)
return r;