src/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   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
  47
  48   // Allow the main thread or another to initialize these bindings
  49   // after instituting restrictions on I/O. Going forward they will
  50   // likely be used in the browser process on most platforms. The
  51   // one-time initialization cost is small, between 2 and 5 ms.
  52   base::ThreadRestrictions::ScopedAllowIO allow_io;
  53
  54   switch (implementation) {
  55     case kGLImplementationOSMesaGL:
  56       return InitializeStaticGLBindingsOSMesaGL();
  57     case kGLImplementationDesktopGL: {
  58       base::NativeLibrary library = NULL;
  59       const CommandLine* command_line = CommandLine::ForCurrentProcess();
  60
  61       if (command_line->HasSwitch(switches::kTestGLLib))
  62         library = LoadLibrary(command_line->GetSwitchValueASCII(
  63             switches::kTestGLLib).c_str());
  64
  65       if (!library) {
  66 #if defined(OS_OPENBSD)
  67         library = LoadLibrary("libGL.so");
  68 #else
  69         library = LoadLibrary("libGL.so.1");
  70 #endif
  71       }
  72
  73       if (!library)
  74         return false;
  75
  76       GLGetProcAddressProc get_proc_address =
  77           reinterpret_cast<GLGetProcAddressProc>(
  78               base::GetFunctionPointerFromNativeLibrary(
  79                   library, "glXGetProcAddress"));
  80       if (!get_proc_address) {
  81         LOG(ERROR) << "glxGetProcAddress not found.";
  82         base::UnloadNativeLibrary(library);
  83         return false;
  84       }
  85
  86       SetGLGetProcAddressProc(get_proc_address);
  87       AddGLNativeLibrary(library);
  88       SetGLImplementation(kGLImplementationDesktopGL);
  89
  90       InitializeStaticGLBindingsGL();
  91       InitializeStaticGLBindingsGLX();
  92       break;
  93     }
  94     case kGLImplementationEGLGLES2: {
  95       base::NativeLibrary gles_library = LoadLibrary("libGLESv2.so.2");
  96       if (!gles_library)
  97         return false;
  98       base::NativeLibrary egl_library = LoadLibrary("libEGL.so.1");
  99       if (!egl_library) {
 100         base::UnloadNativeLibrary(gles_library);
 101         return false;
 102       }
 103
 104       GLGetProcAddressProc get_proc_address =
 105           reinterpret_cast<GLGetProcAddressProc>(
 106               base::GetFunctionPointerFromNativeLibrary(
 107                   egl_library, "eglGetProcAddress"));
 108       if (!get_proc_address) {
 109         LOG(ERROR) << "eglGetProcAddress not found.";
 110         base::UnloadNativeLibrary(egl_library);
 111         base::UnloadNativeLibrary(gles_library);
 112         return false;
 113       }
 114
 115       SetGLGetProcAddressProc(get_proc_address);
 116       AddGLNativeLibrary(egl_library);
 117       AddGLNativeLibrary(gles_library);
 118       SetGLImplementation(kGLImplementationEGLGLES2);
 119
 120       InitializeStaticGLBindingsGL();
 121       InitializeStaticGLBindingsEGL();
 122
 123       // These two functions take single precision float rather than double
 124       // precision float parameters in GLES.
 125       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
 126       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
 127       break;
 128     }
 129     case kGLImplementationMockGL: {
 130       SetGLImplementation(kGLImplementationMockGL);
 131       InitializeStaticGLBindingsGL();
 132       break;
 133     }
 134     default:
 135       return false;
 136   }
 137
 138
 139   return true;
 140 }
 141
 142 bool InitializeDynamicGLBindings(GLImplementation implementation,
 143     GLContext* context) {
 144   switch (implementation) {
 145     case kGLImplementationOSMesaGL:
 146       InitializeDynamicGLBindingsGL(context);
 147       InitializeDynamicGLBindingsOSMESA(context);
 148       break;
 149     case kGLImplementationDesktopGL:
 150       InitializeDynamicGLBindingsGL(context);
 151       InitializeDynamicGLBindingsGLX(context);
 152       break;
 153     case kGLImplementationEGLGLES2:
 154       InitializeDynamicGLBindingsGL(context);
 155       InitializeDynamicGLBindingsEGL(context);
 156       break;
 157     case kGLImplementationMockGL:
 158       if (!context) {
 159         scoped_refptr<GLContextStubWithExtensions> mock_context(
 160             new GLContextStubWithExtensions());
 161         mock_context->SetGLVersionString("3.0");
 162         InitializeDynamicGLBindingsGL(mock_context.get());
 163       } else
 164         InitializeDynamicGLBindingsGL(context);
 165       break;
 166     default:
 167       return false;
 168   }
 169
 170   return true;
 171 }
 172
 173 void InitializeDebugGLBindings() {
 174   InitializeDebugGLBindingsEGL();
 175   InitializeDebugGLBindingsGL();
 176   InitializeDebugGLBindingsGLX();
 177   InitializeDebugGLBindingsOSMESA();
 178 }
 179
 180 void ClearGLBindings() {
 181   ClearGLBindingsEGL();
 182   ClearGLBindingsGL();
 183   ClearGLBindingsGLX();
 184   ClearGLBindingsOSMESA();
 185   SetGLImplementation(kGLImplementationNone);
 186
 187   UnloadGLNativeLibraries();
 188 }
 189
 190 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
 191   switch (GetGLImplementation()) {
 192     case kGLImplementationDesktopGL:
 193       return GetGLWindowSystemBindingInfoGLX(info);
 194     case kGLImplementationEGLGLES2:
 195       return GetGLWindowSystemBindingInfoEGL(info);
 196     default:
 197       return false;
 198   }
 199   return false;
 200 }
 201
 202 }  // namespace gfx