From: Francisco Jerez <currojerez@riseup.net>
Date: Fri, 6 Jan 2017 22:41:27 +0000 (-0800)
Subject: intel/fs: Don't enable dual source blend if no outputs are written
X-Git-Tag: upstream/19.0.0~4204
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8b788069fbb4ffe98aea52232bfd5e0200a88121;p=platform%2Fupstream%2Fmesa.git

intel/fs: Don't enable dual source blend if no outputs are written

This prevents a crash in some arb_enhanced_layouts tests that would be
caused by the next commit.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
---

diff --git a/src/intel/compiler/brw_fs_visitor.cpp b/src/intel/compiler/brw_fs_visitor.cpp
index d3d6913..746cbb7 100644
--- a/src/intel/compiler/brw_fs_visitor.cpp
+++ b/src/intel/compiler/brw_fs_visitor.cpp
@@ -440,7 +440,8 @@ fs_visitor::emit_fb_writes()
       inst->target = target;
    }
 
-   prog_data->dual_src_blend = (this->dual_src_output.file != BAD_FILE);
+   prog_data->dual_src_blend = (this->dual_src_output.file != BAD_FILE &&
+                                this->outputs[0].file != BAD_FILE);
    assert(!prog_data->dual_src_blend || key->nr_color_regions == 1);
 
    if (inst == NULL) {