ui/gl/gl_implementation_ozone.cc

   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 #include "base/bind.h"
   6 #include "ui/gl/gl_bindings.h"
   7 #include "ui/gl/gl_context_stub_with_extensions.h"
   8 #include "ui/gl/gl_egl_api_implementation.h"
   9 #include "ui/gl/gl_gl_api_implementation.h"
  10 #include "ui/gl/gl_implementation.h"
  11 #include "ui/gl/gl_implementation_osmesa.h"
  12 #include "ui/gl/gl_osmesa_api_implementation.h"
  13 #include "ui/ozone/public/ozone_platform.h"
  14 #include "ui/ozone/public/surface_factory_ozone.h"
  15
  16 namespace gfx {
  17
  18 namespace {
  19
  20 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
  21   glClearDepthf(static_cast<GLclampf>(depth));
  22 }
  23
  24 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
  25                                                     GLclampd z_far) {
  26   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
  27 }
  28
  29 }  // namespace
  30
  31 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
  32   impls->push_back(kGLImplementationEGLGLES2);
  33   impls->push_back(kGLImplementationOSMesaGL);
  34 }
  35
  36 bool InitializeStaticGLBindings(GLImplementation implementation) {
  37   // Prevent reinitialization with a different implementation. Once the gpu
  38   // unit tests have initialized with kGLImplementationMock, we don't want to
  39   // later switch to another GL implementation.
  40   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
  41   ui::OzonePlatform::InitializeForGPU();
  42
  43   switch (implementation) {
  44     case kGLImplementationOSMesaGL:
  45       return InitializeStaticGLBindingsOSMesaGL();
  46     case kGLImplementationEGLGLES2:
  47       if (!ui::OzonePlatform::GetInstance()
  48                ->GetSurfaceFactoryOzone()
  49                ->LoadEGLGLES2Bindings(base::Bind(&AddGLNativeLibrary),
  50                                       base::Bind(&SetGLGetProcAddressProc)))
  51         return false;
  52       SetGLImplementation(kGLImplementationEGLGLES2);
  53       InitializeStaticGLBindingsGL();
  54       InitializeStaticGLBindingsEGL();
  55
  56       // These two functions take single precision float rather than double
  57       // precision float parameters in GLES.
  58       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
  59       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
  60       break;
  61     case kGLImplementationMockGL: {
  62       SetGLImplementation(kGLImplementationMockGL);
  63       InitializeStaticGLBindingsGL();
  64       break;
  65     }
  66     default:
  67       NOTIMPLEMENTED()
  68           << "Unsupported GL type for Ozone surface implementation";
  69       return false;
  70   }
  71
  72   return true;
  73 }
  74
  75 bool InitializeDynamicGLBindings(GLImplementation implementation,
  76                                  GLContext* context) {
  77   switch (implementation) {
  78     case kGLImplementationOSMesaGL:
  79     case kGLImplementationEGLGLES2:
  80       InitializeDynamicGLBindingsGL(context);
  81       break;
  82     case kGLImplementationMockGL:
  83       if (!context) {
  84         scoped_refptr<GLContextStubWithExtensions> mock_context(
  85             new GLContextStubWithExtensions());
  86         mock_context->SetGLVersionString("3.0");
  87         InitializeDynamicGLBindingsGL(mock_context.get());
  88       } else
  89         InitializeDynamicGLBindingsGL(context);
  90       break;
  91     default:
  92       return false;
  93   }
  94
  95   return true;
  96 }
  97
  98 void InitializeDebugGLBindings() {
  99 }
 100
 101 void ClearGLBindings() {
 102   ClearGLBindingsEGL();
 103   ClearGLBindingsGL();
 104   SetGLImplementation(kGLImplementationNone);
 105   UnloadGLNativeLibraries();
 106 }
 107
 108 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
 109   switch (GetGLImplementation()) {
 110     case kGLImplementationEGLGLES2:
 111       return GetGLWindowSystemBindingInfoEGL(info);
 112     default:
 113       return false;
 114   }
 115   return false;
 116 }
 117
 118 }  // namespace gfx