Add class GrGLTextureRenderTarget for GL texture/rendertarget objects

src/gpu/gl/GrGLRenderTarget.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 "GrGLRenderTarget.h"
 
 #include "GrGpuGL.h"
 
-#define GPUGL static_cast<GrGpuGL*>(getGpu())
-
+#define GPUGL static_cast<GrGpuGL*>(this->getGpu())
 #define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X)
 
-void GrGLRenderTarget::init(const GrSurfaceDesc& desc,
-                            const IDDesc& idDesc,
-                            const GrGLIRect& viewport,
-                            GrGLTexID* texID) {
+// Because this class is virtually derived from GrSurface we must explicitly call its constructor.
+GrGLRenderTarget::GrGLRenderTarget(GrGpuGL* gpu, const GrSurfaceDesc& desc, const IDDesc& idDesc)
+    : GrSurface(gpu, idDesc.fIsWrapped, desc)
+    , INHERITED(gpu, idDesc.fIsWrapped, desc) {
+    this->init(desc, idDesc);
+    this->registerWithCache();
+}
+
+GrGLRenderTarget::GrGLRenderTarget(GrGpuGL* gpu, const GrSurfaceDesc& desc, const IDDesc& idDesc,
+                                   Derived)
+    : GrSurface(gpu, idDesc.fIsWrapped, desc)
+    , INHERITED(gpu, idDesc.fIsWrapped, desc) {
+    this->init(desc, idDesc);
+}
+
+void GrGLRenderTarget::init(const GrSurfaceDesc& desc, const IDDesc& idDesc) {
     fRTFBOID                = idDesc.fRTFBOID;
     fTexFBOID               = idDesc.fTexFBOID;
     fMSColorRenderbufferID  = idDesc.fMSColorRenderbufferID;
-    fViewport               = viewport;
-    fTexIDObj.reset(SkSafeRef(texID));
-    this->registerWithCache();
+
+    fViewport.fLeft   = 0;
+    fViewport.fBottom = 0;
+    fViewport.fWidth  = desc.fWidth;
+    fViewport.fHeight = desc.fHeight;
+
+    // We own one color value for each MSAA sample.
+    fColorValuesPerPixel = SkTMax(1, fDesc.fSampleCnt);
+    if (fTexFBOID != fRTFBOID) {
+        // If we own the resolve buffer then that is one more sample per pixel.
+        fColorValuesPerPixel += 1;
+    } 
 }
 
-GrGLRenderTarget::GrGLRenderTarget(GrGpuGL* gpu,
-                                   const IDDesc& idDesc,
-                                   const GrGLIRect& viewport,
-                                   GrGLTexID* texID,
-                                   GrGLTexture* texture)
-    : INHERITED(gpu, idDesc.fIsWrapped, texture, texture->desc()) {
-    SkASSERT(texID);
-    SkASSERT(texture);
-    // FBO 0 can't also be a texture, right?
-    SkASSERT(0 != idDesc.fRTFBOID);
-    SkASSERT(0 != idDesc.fTexFBOID);
-
-    // we assume this is true, TODO: get rid of viewport as a param.
-    SkASSERT(viewport.fWidth == texture->width());
-    SkASSERT(viewport.fHeight == texture->height());
-
-    this->init(texture->desc(), idDesc, viewport, texID);
-}
-
-GrGLRenderTarget::GrGLRenderTarget(GrGpuGL* gpu,
-                                   const GrSurfaceDesc& desc,
-                                   const IDDesc& idDesc,
-                                   const GrGLIRect& viewport)
-    : INHERITED(gpu, idDesc.fIsWrapped, NULL, desc) {
-    this->init(desc, idDesc, viewport, NULL);
+size_t GrGLRenderTarget::gpuMemorySize() const {
+    SkASSERT(kUnknown_GrPixelConfig != fDesc.fConfig);
+    SkASSERT(!GrPixelConfigIsCompressed(fDesc.fConfig));
+    size_t colorBytes = GrBytesPerPixel(fDesc.fConfig);
+    SkASSERT(colorBytes > 0);
+    return fColorValuesPerPixel * fDesc.fWidth * fDesc.fHeight * colorBytes;
 }
 
 void GrGLRenderTarget::onRelease() {
     if (!this->isWrapped()) {
         if (fTexFBOID) {
             GL_CALL(DeleteFramebuffers(1, &fTexFBOID));
         }
         if (fRTFBOID && fRTFBOID != fTexFBOID) {
             GL_CALL(DeleteFramebuffers(1, &fRTFBOID));
         }
         if (fMSColorRenderbufferID) {
             GL_CALL(DeleteRenderbuffers(1, &fMSColorRenderbufferID));
         }
     }
     fRTFBOID                = 0;
     fTexFBOID               = 0;
     fMSColorRenderbufferID  = 0;
-    fTexIDObj.reset(NULL);
     INHERITED::onRelease();
 }
 
 void GrGLRenderTarget::onAbandon() {
     fRTFBOID                = 0;
     fTexFBOID               = 0;
     fMSColorRenderbufferID  = 0;
-    if (fTexIDObj.get()) {
-        fTexIDObj->abandon();
-        fTexIDObj.reset(NULL);
-    }
     INHERITED::onAbandon();
 }