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softpipe: fix computation of fragment[FACE] attribute

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In TGSI, front facing is +1 and back-facing is -1.  We were computing
this attribute as +1 and 0 before.  However, the value isn't actually
used anywhere because we machine->Face attribute overrides it in
tgsi_exec.c.  That could be changed, removing some special-case code...
This commit is contained in:
Brian Paul 2010-04-18 09:46:25 -06:00
parent 6756c07b66
commit 10e4ec448e
1 changed files with 7 additions and 3 deletions
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10
src/gallium/drivers/softpipe/sp_setup.c
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@ -387,6 +387,7 @@ setup_sort_vertices(struct setup_context *setup,
/* We need to know if this is a front or back-facing triangle for:
* - the GLSL gl_FrontFacing fragment attribute (bool)
* - two-sided stencil test
* 0 = front-facing, 1 = back-facing
*/
setup->facing =
((det > 0.0) ^
@ -664,7 +665,8 @@ setup_tri_coefficients(struct setup_context *setup)
}
if (spfs->info.input_semantic_name[fragSlot] == TGSI_SEMANTIC_FACE) {
setup->coef[fragSlot].a0[0] = 1.0f - setup->facing;
/* convert 0 to 1.0 and 1 to -1.0 */
setup->coef[fragSlot].a0[0] = setup->facing * -2.0f + 1.0f;
setup->coef[fragSlot].dadx[0] = 0.0;
setup->coef[fragSlot].dady[0] = 0.0;
}
@ -1019,7 +1021,8 @@ setup_line_coefficients(struct setup_context *setup,
}
if (spfs->info.input_semantic_name[fragSlot] == TGSI_SEMANTIC_FACE) {
setup->coef[fragSlot].a0[0] = 1.0f - setup->facing;
/* convert 0 to 1.0 and 1 to -1.0 */
setup->coef[fragSlot].a0[0] = setup->facing * -2.0f + 1.0f;
setup->coef[fragSlot].dadx[0] = 0.0;
setup->coef[fragSlot].dady[0] = 0.0;
}
@ -1265,7 +1268,8 @@ sp_setup_point(struct setup_context *setup,
}
if (spfs->info.input_semantic_name[fragSlot] == TGSI_SEMANTIC_FACE) {
setup->coef[fragSlot].a0[0] = 1.0f - setup->facing;
/* convert 0 to 1.0 and 1 to -1.0 */
setup->coef[fragSlot].a0[0] = setup->facing * -2.0f + 1.0f;
setup->coef[fragSlot].dadx[0] = 0.0;
setup->coef[fragSlot].dady[0] = 0.0;
}