ui/gl/gl_gl_api_implementation.h

   1 // Copyright (c) 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 UI_GL_GL_GL_API_IMPLEMENTATION_H_
   6 #define UI_GL_GL_GL_API_IMPLEMENTATION_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "ui/gl/gl_bindings.h"
  10
  11 namespace gpu {
  12 namespace gles2 {
  13 class GLES2Decoder;
  14 }
  15 }
  16 namespace gfx {
  17
  18 class GLContext;
  19 class GLSurface;
  20
  21 void InitializeStaticGLBindingsGL();
  22 void InitializeDynamicGLBindingsGL(GLContext* context);
  23 void InitializeDebugGLBindingsGL();
  24 void InitializeNullDrawGLBindingsGL();
  25 // TODO(danakj): Remove this when all test suites are using null-draw.
  26 bool HasInitializedNullDrawGLBindingsGL();
  27 bool SetNullDrawGLBindingsEnabledGL(bool enabled);
  28 void ClearGLBindingsGL();
  29 void SetGLToRealGLApi();
  30 void SetGLApi(GLApi* api);
  31 void SetGLApiToNoContext();
  32
  33 class GLApiBase : public GLApi {
  34  public:
  35   // Include the auto-generated part of this class. We split this because
  36   // it means we can easily edit the non-auto generated parts right here in
  37   // this file instead of having to edit some template or the code generator.
  38   #include "gl_bindings_api_autogen_gl.h"
  39
  40  protected:
  41   GLApiBase();
  42   virtual ~GLApiBase();
  43   void InitializeBase(DriverGL* driver);
  44   void SignalFlush();
  45
  46   DriverGL* driver_;
  47 };
  48
  49 // Implemenents the GL API by calling directly into the driver.
  50 class RealGLApi : public GLApiBase {
  51  public:
  52   RealGLApi();
  53   virtual ~RealGLApi();
  54   void Initialize(DriverGL* driver);
  55
  56  private:
  57   virtual void glFinishFn() OVERRIDE;
  58   virtual void glFlushFn() OVERRIDE;
  59 };
  60
  61 // Inserts a TRACE for every GL call.
  62 class TraceGLApi : public GLApi {
  63  public:
  64   TraceGLApi(GLApi* gl_api) : gl_api_(gl_api) { }
  65   virtual ~TraceGLApi();
  66
  67   // Include the auto-generated part of this class. We split this because
  68   // it means we can easily edit the non-auto generated parts right here in
  69   // this file instead of having to edit some template or the code generator.
  70   #include "gl_bindings_api_autogen_gl.h"
  71
  72  private:
  73   GLApi* gl_api_;
  74 };
  75
  76 // Catches incorrect usage when GL calls are made without a current context.
  77 class NoContextGLApi : public GLApi {
  78  public:
  79   NoContextGLApi();
  80   virtual ~NoContextGLApi();
  81
  82   // Include the auto-generated part of this class. We split this because
  83   // it means we can easily edit the non-auto generated parts right here in
  84   // this file instead of having to edit some template or the code generator.
  85   #include "gl_bindings_api_autogen_gl.h"
  86 };
  87
  88 // Implementents the GL API using co-operative state restoring.
  89 // Assumes there is only one real GL context and that multiple virtual contexts
  90 // are implemented above it. Restores the needed state from the current context.
  91 class VirtualGLApi : public GLApiBase {
  92  public:
  93   VirtualGLApi();
  94   virtual ~VirtualGLApi();
  95   void Initialize(DriverGL* driver, GLContext* real_context);
  96
  97   // Sets the current virutal context.
  98   bool MakeCurrent(GLContext* virtual_context, GLSurface* surface);
  99
 100   void OnReleaseVirtuallyCurrent(GLContext* virtual_context);
 101
 102 private:
 103   // Overridden functions from GLApiBase
 104   virtual const GLubyte* glGetStringFn(GLenum name) OVERRIDE;
 105   virtual void glFinishFn() OVERRIDE;
 106   virtual void glFlushFn() OVERRIDE;
 107
 108   // The real context we're running on.
 109   GLContext* real_context_;
 110
 111   // The current virtual context.
 112   GLContext* current_context_;
 113
 114   // The supported extensions being advertised for this virtual context.
 115   std::string extensions_;
 116 };
 117
 118 }  // namespace gfx
 119
 120 #endif  // UI_GL_GL_GL_API_IMPLEMENTATION_H_