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i965/fs: Gen4-5: Setup discard masks for MRT alpha test

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The same setup is required here as when the user-provided shader
explicitly uses KIL or discard.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit ca82ba90dd)
This commit is contained in:
Chris Forbes 2013-10-28 04:18:29 +13:00 • committed by Carl Worth
parent 4f247c28e5
commit 56b0e3271a
2 changed files with 2 additions and 2 deletions
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2
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -2920,7 +2920,7 @@ fs_visitor::run()
/* We handle discards by keeping track of the still-live pixels in f0.1.
* Initialize it with the dispatched pixels.
*/
if (fp->UsesKill) {
if (fp->UsesKill || c->key.alpha_test_func) {
fs_inst *discard_init = emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS);
discard_init->flag_subreg = 1;
}

2
src/mesa/drivers/dri/i965/brw_fs_emit.cpp
View file

@ -107,7 +107,7 @@ fs_generator::generate_fb_write(fs_inst *inst)
brw_set_mask_control(p, BRW_MASK_DISABLE);
brw_set_compression_control(p, BRW_COMPRESSION_NONE);
if (fp->UsesKill) {
if (fp->UsesKill || c->key.alpha_test_func) {
struct brw_reg pixel_mask;
if (brw->gen >= 6)