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i965: don't do calculation for delta_xy on sandybridge 

Sandybridge doesn't have Xstart/Ystart in payload header.
This commit is contained in:
Zhenyu Wang 2010-09-25 10:48:52 +08:00
parent c58bf2cee5
commit 85fa900b93
1 changed files with 16 additions and 0 deletions
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16
src/mesa/drivers/dri/i965/brw_wm_emit.c
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@ -173,6 +173,7 @@ void emit_delta_xy(struct brw_compile *p,
GLuint mask,
const struct brw_reg *arg0)
{
struct intel_context *intel = &p->brw->intel;
struct brw_reg r1 = brw_vec1_grf(1, 0);
if (mask == 0)
@ -180,6 +181,21 @@ void emit_delta_xy(struct brw_compile *p,
assert(mask == WRITEMASK_XY);
if (intel->gen >= 6) {
/* XXX Gen6 WM doesn't have Xstart/Ystart in payload r1.0/r1.1.
Just add them with 0.0 for dst reg.. */
r1 = brw_imm_v(0x00000000);
brw_ADD(p,
dst[0],
retype(arg0[0], BRW_REGISTER_TYPE_UW),
r1);
brw_ADD(p,
dst[1],
retype(arg0[1], BRW_REGISTER_TYPE_UW),
r1);
return;
}
/* Calc delta X,Y by subtracting origin in r1 from the pixel
* centers produced by emit_pixel_xy().
*/