Add a workaround for platforms with broken geo shader invocations

BUG=skia:

Change-Id: I9105b65b522d9ffac5a90ca7126bfd4ae88f8069
Reviewed-on: https://skia-review.googlesource.com/8422
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/gpu/GrShaderCaps.h b/include/gpu/GrShaderCaps.h
index 918138c878..36ab3c3c35 100644
--- a/include/gpu/GrShaderCaps.h
+++ b/include/gpu/GrShaderCaps.h
@@ -176,6 +176,9 @@ public:
 
     bool requiresLocalOutputColorForFBFetch() const { return fRequiresLocalOutputColorForFBFetch; }
 
+    // On MacBook, geometry shaders break if they have more than one invocation.
+    bool mustImplementGSInvocationsWithLoop() const { return fMustImplementGSInvocationsWithLoop; }
+
     // Returns the string of an extension that must be enabled in the shader to support
     // derivatives. If nullptr is returned then no extension needs to be enabled. Before calling
     // this function, the caller should check that shaderDerivativeSupport exists.
@@ -304,6 +307,7 @@ private:
     bool fMustForceNegatedAtanParamToFloat : 1;
     bool fAtan2ImplementedAsAtanYOverX : 1;
     bool fRequiresLocalOutputColorForFBFetch : 1;
+    bool fMustImplementGSInvocationsWithLoop : 1;
 
     PrecisionInfo fFloatPrecisions[kGrShaderTypeCount][kGrSLPrecisionCount];
     int fPixelLocalStorageSize;