Texturing support for RECTANGLE textures.

src/gpu/glsl/GrGLSLShaderBuilder.cpp

Index: src/gpu/glsl/GrGLSLShaderBuilder.cpp
diff --git a/src/gpu/glsl/GrGLSLShaderBuilder.cpp b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
index f1ede1decd7ce6c589264a95e4805077d26c0a23..a2cf66cb4097c591f6a5014328356291d8acc09c 100644
--- a/src/gpu/glsl/GrGLSLShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
@@ -63,10 +63,29 @@ void GrGLSLShaderBuilder::appendTextureLookup(SkString* out,
     const GrGLSLCaps* glslCaps = fProgramBuilder->glslCaps();
     GrGLSLUniformHandler* uniformHandler = fProgramBuilder->uniformHandler();
     GrSLType samplerType = uniformHandler->getUniformVariable(sampler.fSamplerUniform).getType();
-    out->appendf("%s(%s, %s)",
-                 GrGLSLTexture2DFunctionName(varyingType, samplerType, glslCaps->generation()),
-                 uniformHandler->getUniformCStr(sampler.fSamplerUniform),
-                 coordName);
+    if (samplerType == kSampler2DRect_GrSLType) {
+        if (varyingType == kVec2f_GrSLType) {
+            out->appendf("%s(%s, textureSize(%s) * %s)",
+                         GrGLSLTexture2DFunctionName(varyingType, samplerType,
+                                                     glslCaps->generation()),
+                         uniformHandler->getUniformCStr(sampler.fSamplerUniform),
+                         uniformHandler->getUniformCStr(sampler.fSamplerUniform),
+                         coordName);
+        } else {
+            out->appendf("%s(%s, vec3(textureSize(%s) * %s.xy, %s.z))",
+                         GrGLSLTexture2DFunctionName(varyingType, samplerType,
+                                                     glslCaps->generation()),
+                         uniformHandler->getUniformCStr(sampler.fSamplerUniform),
+                         uniformHandler->getUniformCStr(sampler.fSamplerUniform),
+                         coordName,
+                         coordName);
+        }
+    } else {
+        out->appendf("%s(%s, %s)",
+                     GrGLSLTexture2DFunctionName(varyingType, samplerType, glslCaps->generation()),
+                     uniformHandler->getUniformCStr(sampler.fSamplerUniform),
+                     coordName);
+    }
 
     // This refers to any swizzling we may need to get from some backend internal format to the
     // format used in GrPixelConfig. If this is implemented by the GrGpu object, then swizzle will