cc/output/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_OUTPUT_TEXTURE_COPIER_H_
   6 #define CC_OUTPUT_TEXTURE_COPIER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "cc/base/cc_export.h"
  11 #include "cc/output/program_binding.h"
  12 #include "cc/output/shader.h"
  13 #include "third_party/khronos/GLES2/gl2.h"
  14 #include "ui/gfx/size.h"
  15
  16 namespace WebKit { class WebGraphicsContext3D; }
  17
  18 namespace cc {
  19
  20 class CC_EXPORT TextureCopier {
  21  public:
  22   struct Parameters {
  23     unsigned source_texture;
  24     unsigned dest_texture;
  25     gfx::Size size;
  26   };
  27   // Copy the base level contents of |source_texture| to |dest_texture|. Both
  28   // texture objects must be complete and have a base level of |size|
  29   // dimensions. The color formats do not need to match, but |dest_texture| must
  30   // have a renderable format.
  31   virtual void CopyTexture(Parameters parameters) = 0;
  32   virtual void Flush() = 0;
  33
  34   virtual ~TextureCopier() {}
  35 };
  36
  37 class CC_EXPORT AcceleratedTextureCopier : public TextureCopier {
  38  public:
  39   static scoped_ptr<AcceleratedTextureCopier> Create(
  40       WebKit::WebGraphicsContext3D* context,
  41       bool using_bind_uniforms,
  42       int highp_threshold_min) {
  43     return make_scoped_ptr(
  44         new AcceleratedTextureCopier(
  45             context, using_bind_uniforms, highp_threshold_min));
  46   }
  47   virtual ~AcceleratedTextureCopier();
  48
  49   virtual void CopyTexture(Parameters parameters) OVERRIDE;
  50   virtual void Flush() OVERRIDE;
  51
  52  protected:
  53   AcceleratedTextureCopier(WebKit::WebGraphicsContext3D* context,
  54                            bool using_bind_uniforms,
  55                            int highp_threshold_min);
  56
  57  private:
  58   typedef ProgramBinding<VertexShaderPosTexIdentity, FragmentShaderRGBATex>
  59       BlitProgram;
  60
  61   WebKit::WebGraphicsContext3D* context_;
  62   GLuint fbo_;
  63   GLuint position_buffer_;
  64   scoped_ptr<BlitProgram> blit_program_;
  65   scoped_ptr<BlitProgram> blit_program_highp_;
  66   bool using_bind_uniforms_;
  67   int highp_threshold_min_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(AcceleratedTextureCopier);
  70 };
  71
  72 }  // namespace cc
  73
  74 #endif  // CC_OUTPUT_TEXTURE_COPIER_H_