cc/texture_copier.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_TEXTURE_COPIER_H_
   6 #define CC_TEXTURE_COPIER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "cc/cc_export.h"
  11 #include "cc/program_binding.h"
  12 #include "cc/shader.h"
  13 #include "third_party/khronos/GLES2/gl2.h"
  14 #include "ui/gfx/size.h"
  15
  16 namespace WebKit {
  17 class WebGraphicsContext3D;
  18 }
  19
  20 namespace cc {
  21
  22 class CC_EXPORT TextureCopier {
  23 public:
  24     struct Parameters {
  25         unsigned sourceTexture;
  26         unsigned destTexture;
  27         gfx::Size size;
  28     };
  29     // Copy the base level contents of |sourceTexture| to |destTexture|. Both texture objects
  30     // must be complete and have a base level of |size| dimensions. The color formats do not need
  31     // to match, but |destTexture| must have a renderable format.
  32     virtual void copyTexture(Parameters) = 0;
  33     virtual void flush() = 0;
  34
  35     virtual ~TextureCopier() { }
  36 };
  37
  38 class CC_EXPORT AcceleratedTextureCopier : public TextureCopier {
  39 public:
  40     static scoped_ptr<AcceleratedTextureCopier> create(WebKit::WebGraphicsContext3D* context, bool usingBindUniforms)
  41     {
  42         return make_scoped_ptr(new AcceleratedTextureCopier(context, usingBindUniforms));
  43     }
  44     virtual ~AcceleratedTextureCopier();
  45
  46     virtual void copyTexture(Parameters) OVERRIDE;
  47     virtual void flush() OVERRIDE;
  48
  49 protected:
  50     AcceleratedTextureCopier(WebKit::WebGraphicsContext3D*, bool usingBindUniforms);
  51
  52 private:
  53     typedef ProgramBinding<VertexShaderPosTexIdentity, FragmentShaderRGBATex> BlitProgram;
  54
  55     WebKit::WebGraphicsContext3D* m_context;
  56     GLuint m_fbo;
  57     GLuint m_positionBuffer;
  58     scoped_ptr<BlitProgram> m_blitProgram;
  59     bool m_usingBindUniforms;
  60
  61     DISALLOW_COPY_AND_ASSIGN(AcceleratedTextureCopier);
  62 };
  63
  64 }
  65
  66 #endif  // CC_TEXTURE_COPIER_H_