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 #include "ui/gl/gl_export.h"
  11
  12 namespace gpu {
  13 namespace gles2 {
  14 class GLES2Decoder;
  15 }
  16 }
  17 namespace gfx {
  18
  19 class GLContext;
  20 class GLSurface;
  21 struct GLVersionInfo;
  22
  23 void InitializeStaticGLBindingsGL();
  24 void InitializeDynamicGLBindingsGL(GLContext* context);
  25 void InitializeDebugGLBindingsGL();
  26 void InitializeNullDrawGLBindingsGL();
  27 // TODO(danakj): Remove this when all test suites are using null-draw.
  28 bool HasInitializedNullDrawGLBindingsGL();
  29 bool SetNullDrawGLBindingsEnabledGL(bool enabled);
  30 void ClearGLBindingsGL();
  31 void SetGLToRealGLApi();
  32 void SetGLApi(GLApi* api);
  33 void SetGLApiToNoContext();
  34 const GLVersionInfo* GetGLVersionInfo();
  35
  36 class GLApiBase : public GLApi {
  37  public:
  38   // Include the auto-generated part of this class. We split this because
  39   // it means we can easily edit the non-auto generated parts right here in
  40   // this file instead of having to edit some template or the code generator.
  41   #include "gl_bindings_api_autogen_gl.h"
  42
  43  protected:
  44   GLApiBase();
  45   ~GLApiBase() override;
  46   void InitializeBase(DriverGL* driver);
  47   void SignalFlush();
  48
  49   DriverGL* driver_;
  50 };
  51
  52 // Implemenents the GL API by calling directly into the driver.
  53 class RealGLApi : public GLApiBase {
  54  public:
  55   RealGLApi();
  56   ~RealGLApi() override;
  57   void Initialize(DriverGL* driver);
  58
  59  private:
  60   void glFinishFn() override;
  61   void glFlushFn() override;
  62 };
  63
  64 // Inserts a TRACE for every GL call.
  65 class TraceGLApi : public GLApi {
  66  public:
  67   TraceGLApi(GLApi* gl_api) : gl_api_(gl_api) { }
  68   ~TraceGLApi() override;
  69
  70   // Include the auto-generated part of this class. We split this because
  71   // it means we can easily edit the non-auto generated parts right here in
  72   // this file instead of having to edit some template or the code generator.
  73   #include "gl_bindings_api_autogen_gl.h"
  74
  75  private:
  76   GLApi* gl_api_;
  77 };
  78
  79 // Catches incorrect usage when GL calls are made without a current context.
  80 class NoContextGLApi : public GLApi {
  81  public:
  82   NoContextGLApi();
  83   ~NoContextGLApi() override;
  84
  85   // Include the auto-generated part of this class. We split this because
  86   // it means we can easily edit the non-auto generated parts right here in
  87   // this file instead of having to edit some template or the code generator.
  88   #include "gl_bindings_api_autogen_gl.h"
  89 };
  90
  91 // Implementents the GL API using co-operative state restoring.
  92 // Assumes there is only one real GL context and that multiple virtual contexts
  93 // are implemented above it. Restores the needed state from the current context.
  94 class VirtualGLApi : public GLApiBase {
  95  public:
  96   VirtualGLApi();
  97   ~VirtualGLApi() override;
  98   void Initialize(DriverGL* driver, GLContext* real_context);
  99
 100   // Sets the current virutal context.
 101   bool MakeCurrent(GLContext* virtual_context, GLSurface* surface);
 102
 103   void OnReleaseVirtuallyCurrent(GLContext* virtual_context);
 104
 105 private:
 106   // Overridden functions from GLApiBase
 107  const GLubyte* glGetStringFn(GLenum name) override;
 108  void glFinishFn() override;
 109  void glFlushFn() override;
 110
 111   // The real context we're running on.
 112   GLContext* real_context_;
 113
 114   // The current virtual context.
 115   GLContext* current_context_;
 116
 117   // The supported extensions being advertised for this virtual context.
 118   std::string extensions_;
 119 };
 120
 121 class GL_EXPORT ScopedSetGLToRealGLApi {
 122  public:
 123   ScopedSetGLToRealGLApi();
 124   ~ScopedSetGLToRealGLApi();
 125
 126  private:
 127   GLApi* old_gl_api_;
 128 };
 129
 130 }  // namespace gfx
 131
 132 #endif  // UI_GL_GL_GL_API_IMPLEMENTATION_H_