ui/gl/gl_implementation_x11.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 <vector>
   6
   7 #include "base/command_line.h"
   8 #include "base/logging.h"
   9 #include "base/threading/thread_restrictions.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_glx_api_implementation.h"
  15 #include "ui/gl/gl_implementation.h"
  16 #include "ui/gl/gl_implementation_linux.h"
  17 #include "ui/gl/gl_osmesa_api_implementation.h"
  18 #include "ui/gl/gl_switches.h"
  19
  20 namespace gfx {
  21 namespace {
  22
  23 // TODO(piman): it should be Desktop GL marshalling from double to float. Today
  24 // on native GLES, we do float->double->float.
  25 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
  26   glClearDepthf(static_cast<GLclampf>(depth));
  27 }
  28
  29 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
  30                                                     GLclampd z_far) {
  31   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
  32 }
  33
  34 }  // namespace
  35
  36 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
  37   impls->push_back(kGLImplementationDesktopGL);
  38   impls->push_back(kGLImplementationEGLGLES2);
  39   impls->push_back(kGLImplementationOSMesaGL);
  40 }
  41
  42 bool InitializeStaticGLBindings(GLImplementation implementation) {
  43   // Prevent reinitialization with a different implementation. Once the gpu
  44   // unit tests have initialized with kGLImplementationMock, we don't want to
  45   // later switch to another GL implementation.
  46   if (GetGLImplementation() != kGLImplementationNone)
  47     return true;
  48
  49   // Allow the main thread or another to initialize these bindings
  50   // after instituting restrictions on I/O. Going forward they will
  51   // likely be used in the browser process on most platforms. The
  52   // one-time initialization cost is small, between 2 and 5 ms.
  53   base::ThreadRestrictions::ScopedAllowIO allow_io;
  54
  55   switch (implementation) {
  56     case kGLImplementationOSMesaGL:
  57       return InitializeStaticGLBindingsOSMesaGL();
  58     case kGLImplementationDesktopGL: {
  59       base::NativeLibrary library = NULL;
  60       const CommandLine* command_line = CommandLine::ForCurrentProcess();
  61
  62       if (command_line->HasSwitch(switches::kTestGLLib))
  63         library = LoadLibrary(command_line->GetSwitchValueASCII(
  64             switches::kTestGLLib).c_str());
  65
  66       if (!library) {
  67 #if defined(OS_OPENBSD)
  68         library = LoadLibrary("libGL.so");
  69 #else
  70         library = LoadLibrary("libGL.so.1");
  71 #endif
  72       }
  73
  74       if (!library)
  75         return false;
  76
  77       GLGetProcAddressProc get_proc_address =
  78           reinterpret_cast<GLGetProcAddressProc>(
  79               base::GetFunctionPointerFromNativeLibrary(
  80                   library, "glXGetProcAddress"));
  81       if (!get_proc_address) {
  82         LOG(ERROR) << "glxGetProcAddress not found.";
  83         base::UnloadNativeLibrary(library);
  84         return false;
  85       }
  86
  87       SetGLGetProcAddressProc(get_proc_address);
  88       AddGLNativeLibrary(library);
  89       SetGLImplementation(kGLImplementationDesktopGL);
  90
  91       InitializeStaticGLBindingsGL();
  92       InitializeStaticGLBindingsGLX();
  93       break;
  94     }
  95     case kGLImplementationEGLGLES2: {
  96       base::NativeLibrary gles_library = LoadLibrary("libGLESv2.so.2");
  97       if (!gles_library)
  98         return false;
  99       base::NativeLibrary egl_library = LoadLibrary("libEGL.so.1");
 100       if (!egl_library) {
 101         base::UnloadNativeLibrary(gles_library);
 102         return false;
 103       }
 104
 105       GLGetProcAddressProc get_proc_address =
 106           reinterpret_cast<GLGetProcAddressProc>(
 107               base::GetFunctionPointerFromNativeLibrary(
 108                   egl_library, "eglGetProcAddress"));
 109       if (!get_proc_address) {
 110         LOG(ERROR) << "eglGetProcAddress not found.";
 111         base::UnloadNativeLibrary(egl_library);
 112         base::UnloadNativeLibrary(gles_library);
 113         return false;
 114       }
 115
 116       SetGLGetProcAddressProc(get_proc_address);
 117       AddGLNativeLibrary(egl_library);
 118       AddGLNativeLibrary(gles_library);
 119       SetGLImplementation(kGLImplementationEGLGLES2);
 120
 121       InitializeStaticGLBindingsGL();
 122       InitializeStaticGLBindingsEGL();
 123
 124       // These two functions take single precision float rather than double
 125       // precision float parameters in GLES.
 126       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
 127       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
 128       break;
 129     }
 130     case kGLImplementationMockGL: {
 131       SetGLImplementation(kGLImplementationMockGL);
 132       InitializeStaticGLBindingsGL();
 133       break;
 134     }
 135     default:
 136       return false;
 137   }
 138
 139
 140   return true;
 141 }
 142
 143 bool InitializeDynamicGLBindings(GLImplementation implementation,
 144     GLContext* context) {
 145   switch (implementation) {
 146     case kGLImplementationOSMesaGL:
 147       InitializeDynamicGLBindingsGL(context);
 148       InitializeDynamicGLBindingsOSMESA(context);
 149       break;
 150     case kGLImplementationDesktopGL:
 151       InitializeDynamicGLBindingsGL(context);
 152       InitializeDynamicGLBindingsGLX(context);
 153       break;
 154     case kGLImplementationEGLGLES2:
 155       InitializeDynamicGLBindingsGL(context);
 156       InitializeDynamicGLBindingsEGL(context);
 157       break;
 158     case kGLImplementationMockGL:
 159       if (!context) {
 160         scoped_refptr<GLContextStubWithExtensions> mock_context(
 161             new GLContextStubWithExtensions());
 162         mock_context->SetGLVersionString("3.0");
 163         InitializeDynamicGLBindingsGL(mock_context.get());
 164       } else
 165         InitializeDynamicGLBindingsGL(context);
 166       break;
 167     default:
 168       return false;
 169   }
 170
 171   return true;
 172 }
 173
 174 void InitializeDebugGLBindings() {
 175   InitializeDebugGLBindingsEGL();
 176   InitializeDebugGLBindingsGL();
 177   InitializeDebugGLBindingsGLX();
 178   InitializeDebugGLBindingsOSMESA();
 179 }
 180
 181 void ClearGLBindings() {
 182   ClearGLBindingsEGL();
 183   ClearGLBindingsGL();
 184   ClearGLBindingsGLX();
 185   ClearGLBindingsOSMESA();
 186   SetGLImplementation(kGLImplementationNone);
 187
 188   UnloadGLNativeLibraries();
 189 }
 190
 191 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
 192   switch (GetGLImplementation()) {
 193     case kGLImplementationDesktopGL:
 194       return GetGLWindowSystemBindingInfoGLX(info);
 195     case kGLImplementationEGLGLES2:
 196       return GetGLWindowSystemBindingInfoEGL(info);
 197     default:
 198       return false;
 199   }
 200   return false;
 201 }
 202
 203 }  // namespace gfx