Drop unused shader support for multisample interpolation

Bug: skia:
Change-Id: Ie19f13877bf6828ab94ffbb20e6f74e0e376f6cb
Reviewed-on: https://skia-review.googlesource.com/107359
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

2 files changed, 0 insertions, 32 deletions

diff --git a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
index 92a0034b73..7f32aa5972 100644
--- a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
@@ -93,23 +93,6 @@ GrGLSLFragmentShaderBuilder::GrGLSLFragmentShaderBuilder(GrGLSLProgramBuilder* p
 #endif
 }
 
-bool GrGLSLFragmentShaderBuilder::enableFeature(GLSLFeature feature) {
-    const GrShaderCaps& shaderCaps = *fProgramBuilder->shaderCaps();
-    switch (feature) {
-        case kMultisampleInterpolation_GLSLFeature:
-            if (!shaderCaps.multisampleInterpolationSupport()) {
-                return false;
-            }
-            if (const char* extension = shaderCaps.multisampleInterpolationExtensionString()) {
-                this->addFeature(1 << kMultisampleInterpolation_GLSLFeature, extension);
-            }
-            return true;
-        default:
-            SK_ABORT("Unexpected GLSLFeature requested.");
-            return false;
-    }
-}
-
 SkString GrGLSLFragmentShaderBuilder::ensureCoords2D(const GrShaderVar& coords) {
     if (kFloat3_GrSLType != coords.getType() && kHalf3_GrSLType != coords.getType()) {
         SkASSERT(kFloat2_GrSLType == coords.getType() || kHalf2_GrSLType == coords.getType());
diff --git a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.h b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.h
index a9e665be1a..d64dfdb519 100644
--- a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.h
+++ b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.h
@@ -25,20 +25,6 @@ public:
     virtual ~GrGLSLFragmentBuilder() {}
 
     /**
-     * Use of these features may require a GLSL extension to be enabled. Shaders may not compile
-     * if code is added that uses one of these features without calling enableFeature()
-     */
-    enum GLSLFeature {
-        kMultisampleInterpolation_GLSLFeature
-    };
-
-    /**
-     * If the feature is supported then true is returned and any necessary #extension declarations
-     * are added to the shaders. If the feature is not supported then false will be returned.
-     */
-    virtual bool enableFeature(GLSLFeature) = 0;
-
-    /**
      * This returns a variable name to access the 2D, perspective correct version of the coords in
      * the fragment shader. The passed in coordinates must either be of type kHalf2 or kHalf3. If
      * the coordinates are 3-dimensional, it a perspective divide into is emitted into the
@@ -123,7 +109,6 @@ public:
     GrGLSLFragmentShaderBuilder(GrGLSLProgramBuilder* program);
 
     // Shared GrGLSLFragmentBuilder interface.
-    bool enableFeature(GLSLFeature) override;
     virtual SkString ensureCoords2D(const GrShaderVar&) override;
 
     // GrGLSLFPFragmentBuilder interface.