As of ARB_gpu_shader5, textureGather doesn't always read the
post-swizzle RED channel -- so we can't just look at the red swizzle
state.
Theoretically we could only flag the quirk if *some* green swizzle is in
use, but that's probably more trouble than it's worth.
Signed-off-by: Chris Forbes <chr...@ijw.co.nz>
---
src/mesa/drivers/dri/i965/brw_wm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_wm.c
b/src/mesa/drivers/dri/i965/brw_wm.c
index 6ce58dd..ebf6b9c 100644
--- a/src/mesa/drivers/dri/i965/brw_wm.c
+++ b/src/mesa/drivers/dri/i965/brw_wm.c
@@ -349,7 +349,7 @@ brw_populate_sampler_prog_key_data(struct gl_context *ctx,
/* gather4's channel select for green from RG32F is broken;
* requires a shader w/a on IVB; fixable with just SCS on HSW. */
if (brw->gen >= 7 && !brw->is_haswell && prog->UsesGather) {
- if (img->InternalFormat == GL_RG32F && GET_SWZ(t->_Swizzle, 0) ==
1)
+ if (img->InternalFormat == GL_RG32F)
key->gather_channel_quirk_mask |= 1 << s;
}
}
--
1.8.4
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