//
// Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// TextureStorage.h: Defines the abstract rx::TextureStorage class.

#ifndef LIBANGLE_RENDERER_D3D_TEXTURESTORAGE_H_
#define LIBANGLE_RENDERER_D3D_TEXTURESTORAGE_H_

#include "libANGLE/Error.h"

#include "common/debug.h"
#include "libANGLE/Error.h"

#include <GLES2/gl2.h>
#include <stdint.h>

namespace gl
{
struct ImageIndex;
struct Box;
struct PixelUnpackState;
}

namespace rx
{
class SwapChainD3D;
class RenderTargetD3D;
class ImageD3D;

class TextureStorage
{
  public:
    TextureStorage();
    virtual ~TextureStorage() {};

    virtual int getTopLevel() const = 0;
    virtual bool isRenderTarget() const = 0;
    virtual bool isManaged() const = 0;
    virtual int getLevelCount() const = 0;

    virtual gl::Error getRenderTarget(const gl::ImageIndex &index, RenderTargetD3D **outRT) = 0;
    virtual gl::Error generateMipmap(const gl::ImageIndex &sourceIndex, const gl::ImageIndex &destIndex) = 0;

    virtual gl::Error copyToStorage(TextureStorage *destStorage) = 0;
    virtual gl::Error setData(const gl::ImageIndex &index, ImageD3D *image, const gl::Box *destBox, GLenum type,
                              const gl::PixelUnpackState &unpack, const uint8_t *pixelData) = 0;

    unsigned int getRenderTargetSerial(const gl::ImageIndex &index) const;
    unsigned int getTextureSerial() const;

    // This is a no-op for most implementations of TextureStorage. Some (e.g. TextureStorage11_2D) might override it.
    virtual gl::Error useLevelZeroWorkaroundTexture(bool useLevelZeroTexture) { return gl::Error(GL_NO_ERROR); }

  protected:
    void initializeSerials(unsigned int rtSerialsToReserve, unsigned int rtSerialsLayerStride);

  private:
    DISALLOW_COPY_AND_ASSIGN(TextureStorage);

    unsigned int mFirstRenderTargetSerial;
    unsigned int mRenderTargetSerialsLayerStride;
};

}

#endif // LIBANGLE_RENDERER_D3D_TEXTURESTORAGE_H_
