src/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_osmesa_api_implementation.h"
  17
  18 namespace gfx {
  19
  20 namespace {
  21
  22 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
  23   glClearDepthf(static_cast<GLclampf>(depth));
  24 }
  25
  26 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
  27                                                     GLclampd z_far) {
  28   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
  29 }
  30
  31 base::NativeLibrary LoadLibrary(const base::FilePath& filename) {
  32   std::string error;
  33   base::NativeLibrary library = base::LoadNativeLibrary(filename, &error);
  34   if (!library) {
  35     DVLOG(1) << "Failed to load " << filename.MaybeAsASCII() << ": " << error;
  36     return NULL;
  37   }
  38   return library;
  39 }
  40
  41 base::NativeLibrary LoadLibrary(const char* filename) {
  42   return LoadLibrary(base::FilePath(filename));
  43 }
  44
  45 }  // namespace
  46
  47 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
  48   impls->push_back(kGLImplementationEGLGLES2);
  49 }
  50
  51 bool InitializeStaticGLBindings(GLImplementation implementation) {
  52   // Prevent reinitialization with a different implementation. Once the gpu
  53   // unit tests have initialized with kGLImplementationMock, we don't want to
  54   // later switch to another GL implementation.
  55   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
  56
  57   switch (implementation) {
  58     case kGLImplementationEGLGLES2: {
  59       base::NativeLibrary gles_library = LoadLibrary("libGLESv2.so");
  60       if (!gles_library) {
  61         LOG(ERROR) << "Failed to load libGLESv2.so.";
  62         return false;
  63       }
  64       base::NativeLibrary egl_library = LoadLibrary("libEGL.so");
  65       if (!egl_library) {
  66         LOG(ERROR) << "Failed to load libEGL.so.";
  67         base::UnloadNativeLibrary(gles_library);
  68         return false;
  69       }
  70
  71       GLGetProcAddressProc get_proc_address =
  72           reinterpret_cast<GLGetProcAddressProc>(
  73               base::GetFunctionPointerFromNativeLibrary(
  74                   egl_library, "eglGetProcAddress"));
  75       if (!get_proc_address) {
  76         LOG(ERROR) << "eglGetProcAddress not found.";
  77         base::UnloadNativeLibrary(egl_library);
  78         base::UnloadNativeLibrary(gles_library);
  79         return false;
  80       }
  81
  82       SetGLGetProcAddressProc(get_proc_address);
  83       AddGLNativeLibrary(egl_library);
  84       AddGLNativeLibrary(gles_library);
  85       SetGLImplementation(kGLImplementationEGLGLES2);
  86
  87       InitializeStaticGLBindingsGL();
  88       InitializeStaticGLBindingsEGL();
  89
  90       // These two functions take single precision float rather than double
  91       // precision float parameters in GLES.
  92       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
  93       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
  94       break;
  95     }
  96     case kGLImplementationMockGL: {
  97       SetGLImplementation(kGLImplementationMockGL);
  98       InitializeStaticGLBindingsGL();
  99       break;
 100     }
 101     default:
 102       NOTIMPLEMENTED() << "InitializeStaticGLBindings on Android";
 103       return false;
 104   }
 105
 106   return true;
 107 }
 108
 109 bool InitializeDynamicGLBindings(GLImplementation implementation,
 110                                  GLContext* context) {
 111   switch (implementation) {
 112     case kGLImplementationEGLGLES2:
 113       InitializeDynamicGLBindingsGL(context);
 114       InitializeDynamicGLBindingsEGL(context);
 115       break;
 116     case kGLImplementationMockGL:
 117       if (!context) {
 118         scoped_refptr<GLContextStubWithExtensions> mock_context(
 119             new GLContextStubWithExtensions());
 120         mock_context->SetGLVersionString("opengl es 3.0");
 121         InitializeDynamicGLBindingsGL(mock_context.get());
 122       } else
 123         InitializeDynamicGLBindingsGL(context);
 124       break;
 125     default:
 126       NOTREACHED() << "InitializeDynamicGLBindings on Android";
 127       return false;
 128   }
 129
 130   return true;
 131 }
 132
 133 void InitializeDebugGLBindings() {
 134   InitializeDebugGLBindingsEGL();
 135   InitializeDebugGLBindingsGL();
 136 }
 137
 138 void ClearGLBindings() {
 139   ClearGLBindingsEGL();
 140   ClearGLBindingsGL();
 141   SetGLImplementation(kGLImplementationNone);
 142
 143   UnloadGLNativeLibraries();
 144 }
 145
 146 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
 147   switch (GetGLImplementation()) {
 148     case kGLImplementationEGLGLES2:
 149       return GetGLWindowSystemBindingInfoEGL(info);
 150     default:
 151       return false;
 152   }
 153   return false;
 154 }
 155
 156 }  // namespace gfx