src/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::SurfaceFactoryOzone::GetInstance()->LoadEGLGLES2Bindings(
  48               base::Bind(&AddGLNativeLibrary),
  49               base::Bind(&SetGLGetProcAddressProc)))
  50         return false;
  51       SetGLImplementation(kGLImplementationEGLGLES2);
  52       InitializeStaticGLBindingsGL();
  53       InitializeStaticGLBindingsEGL();
  54
  55       // These two functions take single precision float rather than double
  56       // precision float parameters in GLES.
  57       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
  58       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
  59       break;
  60     case kGLImplementationMockGL: {
  61       SetGLImplementation(kGLImplementationMockGL);
  62       InitializeStaticGLBindingsGL();
  63       break;
  64     }
  65     default:
  66       NOTIMPLEMENTED()
  67           << "Unsupported GL type for Ozone surface implementation";
  68       return false;
  69   }
  70
  71   return true;
  72 }
  73
  74 bool InitializeDynamicGLBindings(GLImplementation implementation,
  75                                  GLContext* context) {
  76   switch (implementation) {
  77     case kGLImplementationOSMesaGL:
  78       InitializeDynamicGLBindingsGL(context);
  79       InitializeDynamicGLBindingsOSMESA(context);
  80       break;
  81     case kGLImplementationEGLGLES2:
  82       InitializeDynamicGLBindingsGL(context);
  83       InitializeDynamicGLBindingsEGL(context);
  84       break;
  85     case kGLImplementationMockGL:
  86       if (!context) {
  87         scoped_refptr<GLContextStubWithExtensions> mock_context(
  88             new GLContextStubWithExtensions());
  89         mock_context->SetGLVersionString("3.0");
  90         InitializeDynamicGLBindingsGL(mock_context.get());
  91       } else
  92         InitializeDynamicGLBindingsGL(context);
  93       break;
  94     default:
  95       return false;
  96   }
  97
  98   return true;
  99 }
 100
 101 void InitializeDebugGLBindings() {
 102 }
 103
 104 void ClearGLBindings() {
 105   ClearGLBindingsEGL();
 106   ClearGLBindingsGL();
 107   SetGLImplementation(kGLImplementationNone);
 108   UnloadGLNativeLibraries();
 109 }
 110
 111 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
 112   switch (GetGLImplementation()) {
 113     case kGLImplementationEGLGLES2:
 114       return GetGLWindowSystemBindingInfoEGL(info);
 115     default:
 116       return false;
 117   }
 118   return false;
 119 }
 120
 121 }  // namespace gfx