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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 GrGLTexture_DEFINED
#define GrGLTexture_DEFINED
#include "GrGLRenderTarget.h"
#include "GrScalar.h"
#include "GrTexture.h"
/**
* A ref counted tex id that deletes the texture in its destructor.
*/
class GrGLTexID : public GrRefCnt {
public:
GrGLTexID(GrGLuint texID, bool ownsID) : fTexID(texID), fOwnsID(ownsID) {}
virtual ~GrGLTexID() {
if (0 != fTexID && fOwnsID) {
GR_GL(DeleteTextures(1, &fTexID));
}
}
void abandon() { fTexID = 0; }
GrGLuint id() const { return fTexID; }
private:
GrGLuint fTexID;
bool fOwnsID;
};
////////////////////////////////////////////////////////////////////////////////
class GrGLTexture : public GrTexture {
public:
enum Orientation {
kBottomUp_Orientation,
kTopDown_Orientation,
};
struct TexParams {
GrGLenum fFilter;
GrGLenum fWrapS;
GrGLenum fWrapT;
void invalidate() { memset(this, 0xff, sizeof(TexParams)); }
};
struct Desc {
int fContentWidth;
int fContentHeight;
int fAllocWidth;
int fAllocHeight;
GrPixelConfig fFormat;
GrGLuint fTextureID;
bool fOwnsID;
GrGLenum fUploadFormat;
GrGLenum fUploadByteCount;
GrGLenum fUploadType;
Orientation fOrientation;
};
// creates a texture that is also an RT
GrGLTexture(GrGpuGL* gpu,
const Desc& textureDesc,
const GrGLRenderTarget::Desc& rtDesc,
const TexParams& initialTexParams);
// creates a non-RT texture
GrGLTexture(GrGpuGL* gpu,
const Desc& textureDesc,
const TexParams& initialTexParams);
virtual ~GrGLTexture() { this->release(); }
// overrides of GrTexture
virtual void uploadTextureData(int x,
int y,
int width,
int height,
const void* srcData,
size_t rowBytes);
virtual intptr_t getTextureHandle() const;
const TexParams& getTexParams() const { return fTexParams; }
void setTexParams(const TexParams& texParams) { fTexParams = texParams; }
GrGLuint textureID() const { return fTexIDObj->id(); }
GrGLenum uploadFormat() const { return fUploadFormat; }
GrGLenum uploadByteCount() const { return fUploadByteCount; }
GrGLenum uploadType() const { return fUploadType; }
/**
* Retrieves the texture width actually allocated in texels.
*
* @return the width in texels
*/
int allocWidth() const { return fAllocWidth; }
/**
* Retrieves the texture height actually allocated in texels.
*
* @return the height in texels
*/
int allocHeight() const { return fAllocHeight; }
/**
* @return width() / allocWidth()
*/
GrScalar contentScaleX() const { return fScaleX; }
/**
* @return height() / allocHeight()
*/
GrScalar contentScaleY() const { return fScaleY; }
// Ganesh assumes texture coordinates have their origin
// in the top-left corner of the image. OpenGL, however,
// has the origin in the lower-left corner. For content that
// is loaded by Ganesh we just push the content "upside down"
// (by GL's understanding of the world ) in glTex*Image and the
// addressing just works out. However, content generated by GL
// (FBO or externally imported texture) will be updside down
// and it is up to the GrGpuGL derivative to handle y-mirroing.
Orientation orientation() const { return fOrientation; }
static const GrGLenum* WrapMode2GLWrap();
protected:
// overrides of GrTexture
virtual void onAbandon();
virtual void onRelease();
private:
TexParams fTexParams;
GrGLTexID* fTexIDObj;
GrGLenum fUploadFormat;
GrGLenum fUploadByteCount;
GrGLenum fUploadType;
int fAllocWidth;
int fAllocHeight;
// precomputed content / alloc ratios
GrScalar fScaleX;
GrScalar fScaleY;
Orientation fOrientation;
void init(GrGpuGL* gpu,
const Desc& textureDesc,
const GrGLRenderTarget::Desc* rtDesc,
const TexParams& initialTexParams);
typedef GrTexture INHERITED;
};
#endif
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