The result of a framebuffer fetch from a multisample FBO is inherently
per-sample, so the spec requires at least those sections of the shader
that depend on the framebuffer fetch result to be executed once per
sample.
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index f9af525..c8686d1 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -6518,7 +6518,8 @@ brw_compile_fs(const struct brw_compiler *compiler, void
*log_data,
(key->persample_interp ||
(shader->info.system_values_read & (SYSTEM_BIT_SAMPLE_ID |
SYSTEM_BIT_SAMPLE_POS)) ||
- shader->info.fs.uses_sample_qualifier);
+ shader->info.fs.uses_sample_qualifier ||
+ shader->info.outputs_read);
prog_data->early_fragment_tests = shader->info.fs.early_fragment_tests;
--
2.9.0
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