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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/base_paths.h"
      6 #include "base/command_line.h"
      7 #include "base/files/file_path.h"
      8 #include "base/logging.h"
      9 #include "base/native_library.h"
     10 #include "base/path_service.h"
     11 #include "ui/gl/gl_bindings.h"
     12 #include "ui/gl/gl_context_stub_with_extensions.h"
     13 #include "ui/gl/gl_egl_api_implementation.h"
     14 #include "ui/gl/gl_gl_api_implementation.h"
     15 #include "ui/gl/gl_implementation.h"
     16 #include "ui/gl/gl_implementation_osmesa.h"
     17 #include "ui/gl/gl_osmesa_api_implementation.h"
     18 
     19 namespace gfx {
     20 
     21 namespace {
     22 
     23 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
     24   glClearDepthf(static_cast<GLclampf>(depth));
     25 }
     26 
     27 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
     28                                                     GLclampd z_far) {
     29   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
     30 }
     31 
     32 }  // namespace
     33 
     34 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
     35   impls->push_back(kGLImplementationEGLGLES2);
     36   impls->push_back(kGLImplementationOSMesaGL);
     37 }
     38 
     39 bool InitializeStaticGLBindings(GLImplementation implementation) {
     40   // Prevent reinitialization with a different implementation. Once the gpu
     41   // unit tests have initialized with kGLImplementationMock, we don't want to
     42   // later switch to another GL implementation.
     43   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
     44 
     45   switch (implementation) {
     46     case kGLImplementationEGLGLES2: {
     47       base::NativeLibrary gles_library =
     48           LoadLibraryAndPrintError("libGLESv2.so");
     49       if (!gles_library)
     50         return false;
     51       base::NativeLibrary egl_library = LoadLibraryAndPrintError("libEGL.so");
     52       if (!egl_library) {
     53         base::UnloadNativeLibrary(gles_library);
     54         return false;
     55       }
     56 
     57       GLGetProcAddressProc get_proc_address =
     58           reinterpret_cast<GLGetProcAddressProc>(
     59               base::GetFunctionPointerFromNativeLibrary(
     60                   egl_library, "eglGetProcAddress"));
     61       if (!get_proc_address) {
     62         LOG(ERROR) << "eglGetProcAddress not found.";
     63         base::UnloadNativeLibrary(egl_library);
     64         base::UnloadNativeLibrary(gles_library);
     65         return false;
     66       }
     67 
     68       SetGLGetProcAddressProc(get_proc_address);
     69       AddGLNativeLibrary(egl_library);
     70       AddGLNativeLibrary(gles_library);
     71       SetGLImplementation(kGLImplementationEGLGLES2);
     72 
     73       InitializeStaticGLBindingsGL();
     74       InitializeStaticGLBindingsEGL();
     75 
     76       // These two functions take single precision float rather than double
     77       // precision float parameters in GLES.
     78       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
     79       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
     80       break;
     81     }
     82     case kGLImplementationOSMesaGL:
     83       InitializeStaticGLBindingsOSMesaGL();
     84       break;
     85     case kGLImplementationMockGL: {
     86       SetGLImplementation(kGLImplementationMockGL);
     87       InitializeStaticGLBindingsGL();
     88       break;
     89     }
     90     default:
     91       NOTIMPLEMENTED() << "InitializeStaticGLBindings on Android";
     92       return false;
     93   }
     94 
     95   return true;
     96 }
     97 
     98 bool InitializeDynamicGLBindings(GLImplementation implementation,
     99                                  GLContext* context) {
    100   switch (implementation) {
    101     case kGLImplementationEGLGLES2:
    102       InitializeDynamicGLBindingsGL(context);
    103       InitializeDynamicGLBindingsEGL(context);
    104       break;
    105     case kGLImplementationOSMesaGL:
    106       InitializeDynamicGLBindingsGL(context);
    107       InitializeDynamicGLBindingsOSMESA(context);
    108       break;
    109     case kGLImplementationMockGL:
    110       if (!context) {
    111         scoped_refptr<GLContextStubWithExtensions> mock_context(
    112             new GLContextStubWithExtensions());
    113         mock_context->SetGLVersionString("opengl es 3.0");
    114         InitializeDynamicGLBindingsGL(mock_context.get());
    115       } else
    116         InitializeDynamicGLBindingsGL(context);
    117       break;
    118     default:
    119       NOTREACHED() << "InitializeDynamicGLBindings on Android";
    120       return false;
    121   }
    122 
    123   return true;
    124 }
    125 
    126 void InitializeDebugGLBindings() {
    127   InitializeDebugGLBindingsEGL();
    128   InitializeDebugGLBindingsGL();
    129   InitializeDebugGLBindingsOSMESA();
    130 }
    131 
    132 void ClearGLBindings() {
    133   ClearGLBindingsEGL();
    134   ClearGLBindingsGL();
    135   ClearGLBindingsOSMESA();
    136   SetGLImplementation(kGLImplementationNone);
    137 
    138   UnloadGLNativeLibraries();
    139 }
    140 
    141 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
    142   switch (GetGLImplementation()) {
    143     case kGLImplementationEGLGLES2:
    144       return GetGLWindowSystemBindingInfoEGL(info);
    145     default:
    146       return false;
    147   }
    148   return false;
    149 }
    150 
    151 }  // namespace gfx
    152