Add support for vertex and geometry shader textures

src/gpu/gl/GrGLTexture.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 "GrGLTexture.h"
 #include "GrGLGpu.h"
 #include "SkTraceMemoryDump.h"
@@ skipping 46 matching lines @@
     }
     INHERITED::onRelease();
 }
 
 void GrGLTexture::onAbandon() {
     fInfo.fTarget = 0;
     fInfo.fID = 0;
     INHERITED::onAbandon();
 }
 
+GrSLType GrGLTexture::getSamplerType() const {
+    if (GR_GL_TEXTURE_EXTERNAL == fInfo.fTarget) {
+        return kSamplerExternal_GrSLType;
+    } else if (GR_GL_TEXTURE_RECTANGLE == fInfo.fTarget) {
+        return kSampler2DRect_GrSLType;
+    } else {
+        SkASSERT(GR_GL_TEXTURE_2D == fInfo.fTarget);
+        return kSampler2D_GrSLType;
+    }
+}
+
 GrBackendObject GrGLTexture::getTextureHandle() const {
 #ifdef SK_IGNORE_GL_TEXTURE_TARGET
     return static_cast<GrBackendObject>(this->textureID());
 #else
     return reinterpret_cast<GrBackendObject>(&fInfo);
 #endif
 }
 
 void GrGLTexture::setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
                                    const SkString& dumpName) const {
     SkString texture_id;
     texture_id.appendU32(this->textureID());
     traceMemoryDump->setMemoryBacking(dumpName.c_str(), "gl_texture",
                                       texture_id.c_str());
 }