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glsl_to_tgsi: fix the value of gl_FrontFacing with native integers

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We must convert it to boolean from the DX9 float encoding that Gallium
specifies.

Later, we should probably define that FACE should be 0 or ~0 if native
integers are supported.

Cc: 10.2 10.3 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit 9ec305ead7)
This commit is contained in:
Marek Olšák 2014-10-16 16:21:54 +02:00 • committed by Emil Velikov
parent 8f6f6a28fa
commit 6fa07d1d48
1 changed files with 9 additions and 5 deletions
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14
src/mesa/state_tracker/st_glsl_to_tgsi.cpp
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@ -4818,15 +4818,19 @@ emit_wpos(struct st_context *st,
* saturating the value to [0,1] does the job.
*/
static void
emit_face_var(struct st_translate *t)
emit_face_var(struct gl_context *ctx, struct st_translate *t)
{
struct ureg_program *ureg = t->ureg;
struct ureg_dst face_temp = ureg_DECL_temporary(ureg);
struct ureg_src face_input = t->inputs[t->inputMapping[VARYING_SLOT_FACE]];
/* MOV_SAT face_temp, input[face] */
face_temp = ureg_saturate(face_temp);
ureg_MOV(ureg, face_temp, face_input);
if (ctx->Const.NativeIntegers) {
ureg_FSGE(ureg, face_temp, face_input, ureg_imm1f(ureg, 0));
}
else {
/* MOV_SAT face_temp, input[face] */
ureg_MOV(ureg, ureg_saturate(face_temp), face_input);
}
/* Use face_temp as face input from here on: */
t->inputs[t->inputMapping[VARYING_SLOT_FACE]] = ureg_src(face_temp);
@ -4946,7 +4950,7 @@ st_translate_program(
}
if (proginfo->InputsRead & VARYING_BIT_FACE)
emit_face_var(t);
emit_face_var(ctx, t);
/*
* Declare output attributes.