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_egl_api_implementation.h"
  13 #include "ui/gl/gl_gl_api_implementation.h"
  14 #include "ui/gl/gl_implementation.h"
  15 #include "ui/gl/gl_osmesa_api_implementation.h"
  16
  17 namespace gfx {
  18
  19 namespace {
  20
  21 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
  22   glClearDepthf(static_cast<GLclampf>(depth));
  23 }
  24
  25 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
  26                                                     GLclampd z_far) {
  27   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
  28 }
  29
  30 base::NativeLibrary LoadLibrary(const base::FilePath& filename) {
  31   std::string error;
  32   base::NativeLibrary library = base::LoadNativeLibrary(filename, &error);
  33   if (!library) {
  34     DVLOG(1) << "Failed to load " << filename.MaybeAsASCII() << ": " << error;
  35     return NULL;
  36   }
  37   return library;
  38 }
  39
  40 base::NativeLibrary LoadLibrary(const char* filename) {
  41   return LoadLibrary(base::FilePath(filename));
  42 }
  43
  44 }  // namespace
  45
  46 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
  47   impls->push_back(kGLImplementationEGLGLES2);
  48 }
  49
  50 bool InitializeGLBindings(GLImplementation implementation) {
  51   // Prevent reinitialization with a different implementation. Once the gpu
  52   // unit tests have initialized with kGLImplementationMock, we don't want to
  53   // later switch to another GL implementation.
  54   if (GetGLImplementation() != kGLImplementationNone)
  55     return true;
  56
  57   switch (implementation) {
  58     case kGLImplementationEGLGLES2: {
  59       base::NativeLibrary gles_library = LoadLibrary("libGLESv2.so");
  60       if (!gles_library)
  61         return false;
  62       base::NativeLibrary egl_library = LoadLibrary("libEGL.so");
  63       if (!egl_library) {
  64         base::UnloadNativeLibrary(gles_library);
  65         return false;
  66       }
  67
  68       GLGetProcAddressProc get_proc_address =
  69           reinterpret_cast<GLGetProcAddressProc>(
  70               base::GetFunctionPointerFromNativeLibrary(
  71                   egl_library, "eglGetProcAddress"));
  72       if (!get_proc_address) {
  73         LOG(ERROR) << "eglGetProcAddress not found.";
  74         base::UnloadNativeLibrary(egl_library);
  75         base::UnloadNativeLibrary(gles_library);
  76         return false;
  77       }
  78
  79       SetGLGetProcAddressProc(get_proc_address);
  80       AddGLNativeLibrary(egl_library);
  81       AddGLNativeLibrary(gles_library);
  82       SetGLImplementation(kGLImplementationEGLGLES2);
  83
  84       InitializeGLBindingsGL();
  85       InitializeGLBindingsEGL();
  86
  87       // These two functions take single precision float rather than double
  88       // precision float parameters in GLES.
  89       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
  90       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
  91       break;
  92     }
  93     case kGLImplementationMockGL: {
  94       SetGLGetProcAddressProc(GetMockGLProcAddress);
  95       SetGLImplementation(kGLImplementationMockGL);
  96       InitializeGLBindingsGL();
  97       break;
  98     }
  99     default:
 100       NOTIMPLEMENTED() << "InitializeGLBindings on Android";
 101       return false;
 102   }
 103
 104   return true;
 105 }
 106
 107 bool InitializeGLExtensionBindings(GLImplementation implementation,
 108                                    GLContext* context) {
 109   switch (implementation) {
 110     case kGLImplementationEGLGLES2:
 111       InitializeGLExtensionBindingsGL(context);
 112       InitializeGLExtensionBindingsEGL(context);
 113       break;
 114     case kGLImplementationMockGL:
 115       InitializeGLExtensionBindingsGL(context);
 116       break;
 117     default:
 118       return false;
 119   }
 120
 121   return true;
 122 }
 123
 124 void InitializeDebugGLBindings() {
 125 }
 126
 127 void ClearGLBindings() {
 128   ClearGLBindingsEGL();
 129   ClearGLBindingsGL();
 130   SetGLImplementation(kGLImplementationNone);
 131
 132   UnloadGLNativeLibraries();
 133 }
 134
 135 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
 136   switch (GetGLImplementation()) {
 137     case kGLImplementationEGLGLES2:
 138       return GetGLWindowSystemBindingInfoEGL(info);
 139     default:
 140       return false;
 141   }
 142   return false;
 143 }
 144
 145 }  // namespace gfx