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