michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #ifndef GrGLRenderTarget_DEFINED
michael@0: #define GrGLRenderTarget_DEFINED
michael@0: 
michael@0: #include "GrGLIRect.h"
michael@0: #include "GrRenderTarget.h"
michael@0: #include "SkScalar.h"
michael@0: 
michael@0: class GrGpuGL;
michael@0: class GrGLTexture;
michael@0: class GrGLTexID;
michael@0: 
michael@0: class GrGLRenderTarget : public GrRenderTarget {
michael@0: 
michael@0: public:
michael@0:     // set fTexFBOID to this value to indicate that it is multisampled but
michael@0:     // Gr doesn't know how to resolve it.
michael@0:     enum { kUnresolvableFBOID = 0 };
michael@0: 
michael@0:     struct Desc {
michael@0:         GrGLuint         fRTFBOID;
michael@0:         GrGLuint         fTexFBOID;
michael@0:         GrGLuint         fMSColorRenderbufferID;
michael@0:         bool             fIsWrapped;
michael@0:         GrPixelConfig    fConfig;
michael@0:         int              fSampleCnt;
michael@0:         GrSurfaceOrigin  fOrigin;
michael@0:         bool             fCheckAllocation;
michael@0:     };
michael@0: 
michael@0:     // creates a GrGLRenderTarget associated with a texture
michael@0:     GrGLRenderTarget(GrGpuGL*          gpu,
michael@0:                      const Desc&       desc,
michael@0:                      const GrGLIRect&  viewport,
michael@0:                      GrGLTexID*        texID,
michael@0:                      GrGLTexture*      texture);
michael@0: 
michael@0:     // creates an independent GrGLRenderTarget
michael@0:     GrGLRenderTarget(GrGpuGL*          gpu,
michael@0:                      const Desc&       desc,
michael@0:                      const GrGLIRect&  viewport);
michael@0: 
michael@0:     virtual ~GrGLRenderTarget() { this->release(); }
michael@0: 
michael@0:     void setViewport(const GrGLIRect& rect) { fViewport = rect; }
michael@0:     const GrGLIRect& getViewport() const { return fViewport; }
michael@0: 
michael@0:     // The following two functions return the same ID when a
michael@0:     // texture/render target is multisampled, and different IDs when
michael@0:     // it is.
michael@0:     // FBO ID used to render into
michael@0:     GrGLuint renderFBOID() const { return fRTFBOID; }
michael@0:     // FBO ID that has texture ID attached.
michael@0:     GrGLuint textureFBOID() const { return fTexFBOID; }
michael@0: 
michael@0:     // override of GrRenderTarget
michael@0:     virtual GrBackendObject getRenderTargetHandle() const {
michael@0:         return this->renderFBOID();
michael@0:     }
michael@0:     virtual GrBackendObject getRenderTargetResolvedHandle() const {
michael@0:         return this->textureFBOID();
michael@0:     }
michael@0:     virtual ResolveType getResolveType() const {
michael@0: 
michael@0:         if (!this->isMultisampled() ||
michael@0:             fRTFBOID == fTexFBOID) {
michael@0:             // catches FBO 0 and non MSAA case
michael@0:             return kAutoResolves_ResolveType;
michael@0:         } else if (kUnresolvableFBOID == fTexFBOID) {
michael@0:             return kCantResolve_ResolveType;
michael@0:         } else {
michael@0:             return kCanResolve_ResolveType;
michael@0:         }
michael@0:     }
michael@0: 
michael@0: protected:
michael@0:     // override of GrResource
michael@0:     virtual void onAbandon() SK_OVERRIDE;
michael@0:     virtual void onRelease() SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     GrGLuint      fRTFBOID;
michael@0:     GrGLuint      fTexFBOID;
michael@0: 
michael@0:     GrGLuint      fMSColorRenderbufferID;
michael@0: 
michael@0:     // when we switch to this render target we want to set the viewport to
michael@0:     // only render to to content area (as opposed to the whole allocation) and
michael@0:     // we want the rendering to be at top left (GL has origin in bottom left)
michael@0:     GrGLIRect fViewport;
michael@0: 
michael@0:     // non-NULL if this RT was created by Gr with an associated GrGLTexture.
michael@0:     SkAutoTUnref<GrGLTexID> fTexIDObj;
michael@0: 
michael@0:     void init(const Desc& desc, const GrGLIRect& viewport, GrGLTexID* texID);
michael@0: 
michael@0:     typedef GrRenderTarget INHERITED;
michael@0: };
michael@0: 
michael@0: #endif