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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_OUTPUT_TEXTURE_COPIER_H_
#define CC_OUTPUT_TEXTURE_COPIER_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "cc/base/cc_export.h"
#include "cc/output/program_binding.h"
#include "cc/output/shader.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "ui/gfx/size.h"
namespace WebKit { class WebGraphicsContext3D; }
namespace cc {
class CC_EXPORT TextureCopier {
public:
struct Parameters {
unsigned source_texture;
unsigned dest_texture;
gfx::Size size;
};
// Copy the base level contents of |source_texture| to |dest_texture|. Both
// texture objects must be complete and have a base level of |size|
// dimensions. The color formats do not need to match, but |dest_texture| must
// have a renderable format.
virtual void CopyTexture(Parameters parameters) = 0;
virtual void Flush() = 0;
virtual ~TextureCopier() {}
};
class CC_EXPORT AcceleratedTextureCopier : public TextureCopier {
public:
static scoped_ptr<AcceleratedTextureCopier> Create(
WebKit::WebGraphicsContext3D* context,
bool using_bind_uniforms,
int highp_threshold_min) {
return make_scoped_ptr(
new AcceleratedTextureCopier(
context, using_bind_uniforms, highp_threshold_min));
}
virtual ~AcceleratedTextureCopier();
virtual void CopyTexture(Parameters parameters) OVERRIDE;
virtual void Flush() OVERRIDE;
protected:
AcceleratedTextureCopier(WebKit::WebGraphicsContext3D* context,
bool using_bind_uniforms,
int highp_threshold_min);
private:
typedef ProgramBinding<VertexShaderPosTexIdentity, FragmentShaderRGBATex>
BlitProgram;
WebKit::WebGraphicsContext3D* context_;
GLuint fbo_;
GLuint position_buffer_;
scoped_ptr<BlitProgram> blit_program_;
scoped_ptr<BlitProgram> blit_program_highp_;
bool using_bind_uniforms_;
int highp_threshold_min_;
int highp_threshold_cache_;
DISALLOW_COPY_AND_ASSIGN(AcceleratedTextureCopier);
};
} // namespace cc
#endif // CC_OUTPUT_TEXTURE_COPIER_H_
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