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st/mesa: fix bug in emit_adjusted_wpos() 

If we bias x,y we still need to pass through z,w in case the shader
reads gl_FragCoord.z or .w.

Fixes fd.o bug 29183 (piglit glsl-bug-22603).

NOTE: This is a candidate for the 7.8 branch.
This commit is contained in:
Brian Paul 2010-07-23 13:39:36 -06:00
parent c65f4fd5ae
commit e393350904
1 changed files with 5 additions and 2 deletions
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7
src/mesa/state_tracker/st_mesa_to_tgsi.c
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@ -738,9 +738,12 @@ emit_adjusted_wpos( struct st_translate *t,
struct ureg_dst wpos_temp = ureg_DECL_temporary(ureg);
struct ureg_src wpos_input = t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]];
/* Note that we bias X and Y and pass Z and W through unchanged.
* The shader might also use gl_FragCoord.w and .z.
*/
ureg_ADD(ureg,
ureg_writemask(wpos_temp, TGSI_WRITEMASK_X | TGSI_WRITEMASK_Y),
wpos_input, ureg_imm1f(ureg, value));
ureg_writemask(wpos_temp, TGSI_WRITEMASK_XYZW),
wpos_input, ureg_imm4f(ureg, value, value, 0.0f, 0.0f));
t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]] = ureg_src(wpos_temp);
}