Add arb_texture_rectangle support properly in GLES3 shaders

src/gpu/gl/GrGLGpu.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLGpu.h"
 #include "GrGLGLSL.h"
 #include "GrGLStencilAttachment.h"
@@ skipping 3301 matching lines @@
             "  v_texCoord = a_vertex.xy * u_texCoordXform.xy + u_texCoordXform.zw;"
             "  gl_Position.xy = a_vertex * u_posXform.xy + u_posXform.zw;"
             "  gl_Position.zw = vec2(0, 1);"
             "}"
         );
 
         SkString fshaderTxt(version);
         if (kSamplerTypes[i] == kSamplerExternal_GrSLType) {
             fshaderTxt.appendf("#extension %s : require\n",
                                this->glCaps().glslCaps()->externalTextureExtensionString());
+        } else if (kSamplerTypes[i] == kSampler2DRect_GrSLType) {
+            const char* rectangleFeatureString =
+                    this->glCaps().glslCaps()->rectangleTextureExtensionString();
+            if (rectangleFeatureString) {
+                fshaderTxt.appendf("#extension %s : require\n",
+                                   rectangleFeatureString);
+            }
         }
+
         GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
                                                      *this->glCaps().glslCaps(),
                                                      &fshaderTxt);
         vTexCoord.setTypeModifier(GrShaderVar::kVaryingIn_TypeModifier);
         vTexCoord.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
         fshaderTxt.append(";");
         uTexture.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
         fshaderTxt.append(";");
         const char* fsOutName;
         if (this->glCaps().glslCaps()->mustDeclareFragmentShaderOutput()) {
             oFragColor.appendDecl(this->glCaps().glslCaps(), &fshaderTxt);
             fshaderTxt.append(";");
             fsOutName = oFragColor.c_str();
         } else {
             fsOutName = "gl_FragColor";
         }
         fshaderTxt.appendf(
             "// Copy Program FS\n"
             "void main() {"
             "  %s = %s(u_texture, v_texCoord);"
             "}",
             fsOutName,
-            GrGLSLTexture2DFunctionName(kVec2f_GrSLType, kSamplerTypes[i], this->glslGeneration())
-        );
+            GrGLSLTexture2DFunctionName(kVec2f_GrSLType, kSamplerTypes[i],
+                                        *this->glCaps().glslCaps()));
 
         GL_CALL_RET(fCopyPrograms[i].fProgram, CreateProgram());
         const char* str;
         GrGLint length;
 
         str = vshaderTxt.c_str();
         length = SkToInt(vshaderTxt.size());
         GrGLuint vshader = GrGLCompileAndAttachShader(*fGLContext, fCopyPrograms[i].fProgram,
                                                       GR_GL_VERTEX_SHADER, &str, &length, 1,
                                                       &fStats);
@@ skipping 534 matching lines @@
         if (GR_GL_TEXTURE_EXTERNAL == glTexture->target() ||
             GR_GL_TEXTURE_RECTANGLE == glTexture->target()) {
             copyParams->fFilter = GrTextureParams::kNone_FilterMode;
             copyParams->fWidth = texture->width();
             copyParams->fHeight = texture->height();
             return true;
         }
     }
     return false;
 }