ui/gl/gl_implementation_android.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/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