http://bugs.freedesktop.org/show_bug.cgi?id=24281
--- Comment #3 from Andre Maasikas <amaasi...@gmail.com> 2009-10-07 07:13:01
PST ---
Below is the fragment program it uses:
Currently we don't set barrier bit on any of these tex intructions as they
don't depend on any prev ins. However they write to same dest, so I guess the
result may get overwritten sometimes...
# Fragment Program/Shader
0: TEX TEMP[0].y, INPUT[4], texture[0], 2D;
1: ADD TEMP[0].x, TEMP[0].yyyy, CONST[0].-z-z-z-z;
2: TEX TEMP[0].y, INPUT[4], texture[2], 2D;
3: ADD TEMP[0].z, TEMP[0].yyyy, CONST[1].-x-x-x-x;
4: MUL TEMP[0].x, TEMP[0], CONST[0].yyyy;
5: MAD OUTPUT[1].z, TEMP[0], CONST[0].wwww, TEMP[0].xxxx;
6: TEX TEMP[0].y, INPUT[4], texture[1], 2D;
7: ADD TEMP[0].y, TEMP[0], CONST[1].-x-x-x-x;
8: MAD TEMP[0].z, TEMP[0].-x-y-z-w, CONST[1].yyyy, TEMP[0].xxxx;
9: MAD OUTPUT[1].y, TEMP[0].-x-y-z-w, CONST[1].zzzz, TEMP[0].zzzz;
10: MAD OUTPUT[1].x, TEMP[0].yyyy, CONST[1].wwww, TEMP[0];
11: MOV OUTPUT[1].w, CONST[0].xxxx;
12: END
As a workarond for now, you can try:
diff --git a/src/mesa/drivers/dri/r600/r700_assembler.c
b/src/mesa/drivers/dri/r600/r700_assembler.c
index 903b696..139a122 100644
--- a/src/mesa/drivers/dri/r600/r700_assembler.c
+++ b/src/mesa/drivers/dri/r600/r700_assembler.c
@@ -686,7 +686,7 @@ GLboolean add_tex_instruction(r700_AssemblerBase* pAsm,
// If this clause constains any TEX instruction that is dependent on a
previous instruction,
// set the barrier bit
- if( pAsm->pInstDeps[pAsm->uiCurInst].nDstDep > (-1) ||
pAsm->need_tex_barrier == GL_TRUE )
+ if(1 || pAsm->pInstDeps[pAsm->uiCurInst].nDstDep > (-1) ||
pAsm->need_tex_barrier == GL_TRUE )
{
pAsm->cf_current_tex_clause_ptr->m_Word1.f.barrier = 0x1;
}
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