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i965: Clarify that DELTAXY always occurs for both X and Y.

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This commit is contained in:
Eric Anholt 2010-03-10 18:48:23 -08:00
parent 46450c1f3f
commit f4f2737e87
1 changed files with 13 additions and 14 deletions
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27
src/mesa/drivers/dri/i965/brw_wm_emit.c
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@ -125,23 +125,22 @@ void emit_delta_xy(struct brw_compile *p,
{
struct brw_reg r1 = brw_vec1_grf(1, 0);
if (mask == 0)
return;
assert(mask == WRITEMASK_XY);
/* Calc delta X,Y by subtracting origin in r1 from the pixel
* centers.
*/
if (mask & WRITEMASK_X) {
brw_ADD(p,
dst[0],
retype(arg0[0], BRW_REGISTER_TYPE_UW),
negate(r1));
}
if (mask & WRITEMASK_Y) {
brw_ADD(p,
dst[1],
retype(arg0[1], BRW_REGISTER_TYPE_UW),
negate(suboffset(r1,1)));
}
brw_ADD(p,
dst[0],
retype(arg0[0], BRW_REGISTER_TYPE_UW),
negate(r1));
brw_ADD(p,
dst[1],
retype(arg0[1], BRW_REGISTER_TYPE_UW),
negate(suboffset(r1,1)));
}
void emit_wpos_xy(struct brw_wm_compile *c,