From: Francisco Jerez <currojerez@riseup.net>
Date: Thu, 21 Jul 2016 23:20:07 +0000 (-0700)
Subject: i965/fs: Force per-sample dispatch if the shader reads from a multisample FBO.
X-Git-Tag: upstream/17.1.0~7016
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=98d61ee083de57da6b97c9fcf67003f56f5f5a6b;p=platform%2Fupstream%2Fmesa.git

i965/fs: Force per-sample dispatch if the shader reads from a multisample FBO.

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.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index c23b558..9f66dc7 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -6552,7 +6552,8 @@ 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;