Enable stencil clipping in mixed sampled render targets

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 6522e1b14bce63256dd822c3ecb973934c50d1e5..3288de6fe6cf6fae297b10b11130a73829b594b8 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -355,6 +355,8 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
         fDiscardRenderTargetSupport = false;
         fInvalidateFBType = kNone_InvalidateFBType;
     }
+    glslCaps->fProgrammableSampleLocationsSupport = ctxInfo.hasExtension("GL_NV_sample_locations");

[Mark Kilgard, 2015/09/30 17:17:47]

probably also worth looking for ARB_sample_locations extension name here.

NVIDIA products will support both the NV (predated the ARB version) and, in
newer versions, the ARB version.

Since we currently plan on just toggling the
GL_FRAMEBUFFER_PROGRAMMABLE_SAMPLE_LOCATIONS_ARB FBO state and the ARB and NV
versions have the same token values, I recommend detecting either extension.

So

glslCaps->fProgrammableSampleLocationsSupport =
ctxInfo.hasExtension("GL_NV_sample_locations") ||
ctxInfo.hasExtension("GL_ARB_sample_locations");

+
 
     /**************************************************************************
      * GrCaps fields