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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLRenderTarget_DEFINED
#define GrGLRenderTarget_DEFINED
#include "GrGLIRect.h"
#include "GrRenderTarget.h"
#include "SkScalar.h"
class GrGLGpu;
class GrGLRenderTarget : public GrRenderTarget {
public:
// set fTexFBOID to this value to indicate that it is multisampled but
// Gr doesn't know how to resolve it.
enum { kUnresolvableFBOID = 0 };
struct IDDesc {
GrGLuint fRTFBOID;
GrGLuint fTexFBOID;
GrGLuint fMSColorRenderbufferID;
bool fIsWrapped;
};
GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&);
void setViewport(const GrGLIRect& rect) { fViewport = rect; }
const GrGLIRect& getViewport() const { return fViewport; }
// The following two functions return the same ID when a
// texture/render target is multisampled, and different IDs when
// it is.
// FBO ID used to render into
GrGLuint renderFBOID() const { return fRTFBOID; }
// FBO ID that has texture ID attached.
GrGLuint textureFBOID() const { return fTexFBOID; }
// override of GrRenderTarget
GrBackendObject getRenderTargetHandle() const SK_OVERRIDE { return this->renderFBOID(); }
GrBackendObject getRenderTargetResolvedHandle() const SK_OVERRIDE { return this->textureFBOID(); }
ResolveType getResolveType() const SK_OVERRIDE {
if (!this->isMultisampled() ||
fRTFBOID == fTexFBOID) {
// catches FBO 0 and non MSAA case
return kAutoResolves_ResolveType;
} else if (kUnresolvableFBOID == fTexFBOID) {
return kCantResolve_ResolveType;
} else {
return kCanResolve_ResolveType;
}
}
protected:
// The public constructor registers this object with the cache. However, only the most derived
// class should register with the cache. This constructor does not do the registration and
// rather moves that burden onto the derived class.
enum Derived { kDerived };
GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&, Derived);
void init(const GrSurfaceDesc&, const IDDesc&);
void onAbandon() SK_OVERRIDE;
void onRelease() SK_OVERRIDE;
// In protected because subclass GrGLTextureRenderTarget calls this version.
size_t onGpuMemorySize() const SK_OVERRIDE;
private:
GrGLuint fRTFBOID;
GrGLuint fTexFBOID;
GrGLuint fMSColorRenderbufferID;
// We track this separately from GrGpuResource because this may be both a texture and a render
// target, and the texture may be wrapped while the render target is not.
bool fIsWrapped;
// when we switch to this render target we want to set the viewport to
// only render to content area (as opposed to the whole allocation) and
// we want the rendering to be at top left (GL has origin in bottom left)
GrGLIRect fViewport;
// onGpuMemorySize() needs to know what how many color values are owned per pixel. However,
// abandon and release zero out the IDs and the cache needs to know the size even after those
// actions.
uint8_t fColorValuesPerPixel;
typedef GrRenderTarget INHERITED;
};
#endif
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