Implement support for CHROMIUM_path_rendering pseudo extension

Implement support for path rendering in Chromium through
CHROMIUM_path_rendering pseudo extension.

The extension defines a new pseudo-gl function,
BindFragmentInputLocation. This behaves similarly to the
BindUniformLocation pseudo-gl function. The idea is to assign fragment
input location to a fragment input before linking the program.

BUG=chromium:344330

Review URL: https://codereview.chromium.org/1192663002

1 files changed, 12 insertions, 0 deletions

diff --git a/src/gpu/gl/GrGLPathRendering.h b/src/gpu/gl/GrGLPathRendering.h
index 86cf1b1698..5996e906bd 100644
--- a/src/gpu/gl/GrGLPathRendering.h
+++ b/src/gpu/gl/GrGLPathRendering.h
@@ -46,6 +46,10 @@ public:
      */
     void abandonGpuResources();
 
+    bool shouldBindFragmentInputs() const {
+        return fCaps.bindFragmentInputSupport;
+    }
+
     // Functions for "separable shader" texturing support.
     void setProgramPathFragmentInputTransform(GrGLuint program, GrGLint location,
                                               GrGLenum genMode, GrGLint components,
@@ -65,6 +69,13 @@ protected:
     void onDrawPaths(const DrawPathArgs&, const GrPathRange*, const void* indices, PathIndexType,
                      const float transformValues[], PathTransformType, int count) override;
 private:
+    /**
+     * Mark certain functionality as not supported.
+     */
+    struct Caps {
+        bool bindFragmentInputSupport : 1;
+    };
+
     void flushPathStencilSettings(const GrStencilSettings&);
 
     struct MatrixState {
@@ -103,6 +114,7 @@ private:
     SkAutoTDelete<GrGLNameAllocator> fPathNameAllocator;
     MatrixState fHWProjectionMatrixState;
     GrStencilSettings fHWPathStencilSettings;
+    Caps fCaps;
 };
 
 #endif