Make SkSL GLSL generator declare sk_FragColor inout when EXT fb fetch is used.

Change-Id: I5e6e3263bb49febc757cd63d5d6c1518f174322d
Reviewed-on: https://skia-review.googlesource.com/118420
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/sksl/ir/SkSLProgram.h b/src/sksl/ir/SkSLProgram.h
index cbb9dfe1a7..03a94fa03f 100644
--- a/src/sksl/ir/SkSLProgram.h
+++ b/src/sksl/ir/SkSLProgram.h
@@ -71,6 +71,8 @@ struct Program {
         // if false, sk_FragCoord is exactly the same as gl_FragCoord. If true, the y coordinate
         // must be flipped.
         bool fFlipY = false;
+        // If true the destination fragment color is read sk_FragColor. It must be declared inout.
+        bool fFragColorIsInOut = false;
         // if true, Setting objects (e.g. sk_Caps.fbFetchSupport) should be replaced with their
         // constant equivalents during compilation
         bool fReplaceSettings = true;