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      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
    122