Mesa (master): st/mesa: fix bug in emit_adjusted_wpos()
Brian Paul
brianp at kemper.freedesktop.org
Fri Jul 23 19:43:22 UTC 2010
Module: Mesa
Branch: master
Commit: e393350904a48d332d832881af9549400194608c
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e393350904a48d332d832881af9549400194608c
Author: Brian Paul <brianp at vmware.com>
Date: Fri Jul 23 13:39:36 2010 -0600
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.
---
src/mesa/state_tracker/st_mesa_to_tgsi.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/mesa/state_tracker/st_mesa_to_tgsi.c b/src/mesa/state_tracker/st_mesa_to_tgsi.c
index bacd091..686ccb9 100644
--- a/src/mesa/state_tracker/st_mesa_to_tgsi.c
+++ b/src/mesa/state_tracker/st_mesa_to_tgsi.c
@@ -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);
}
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