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_osmesa.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 #if defined(OS_OPENBSD)
  35 const char kGLLibraryName[] = "libGL.so";
  36 #else
  37 const char kGLLibraryName[] = "libGL.so.1";
  38 #endif
  39
  40 const char kGLESv2LibraryName[] = "libGLESv2.so.2";
  41 const char kEGLLibraryName[] = "libEGL.so.1";
  42
  43 }  // namespace
  44
  45 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
  46   impls->push_back(kGLImplementationDesktopGL);
  47   impls->push_back(kGLImplementationEGLGLES2);
  48   impls->push_back(kGLImplementationOSMesaGL);
  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   // Allow the main thread or another to initialize these bindings
  58   // after instituting restrictions on I/O. Going forward they will
  59   // likely be used in the browser process on most platforms. The
  60   // one-time initialization cost is small, between 2 and 5 ms.
  61   base::ThreadRestrictions::ScopedAllowIO allow_io;
  62
  63   switch (implementation) {
  64     case kGLImplementationOSMesaGL:
  65       return InitializeStaticGLBindingsOSMesaGL();
  66     case kGLImplementationDesktopGL: {
  67       base::NativeLibrary library = NULL;
  68       const CommandLine* command_line = CommandLine::ForCurrentProcess();
  69
  70       if (command_line->HasSwitch(switches::kTestGLLib))
  71         library = LoadLibraryAndPrintError(
  72             command_line->GetSwitchValueASCII(switches::kTestGLLib).c_str());
  73
  74       if (!library) {
  75         library = LoadLibraryAndPrintError(kGLLibraryName);
  76       }
  77
  78       if (!library)
  79         return false;
  80
  81       GLGetProcAddressProc get_proc_address =
  82           reinterpret_cast<GLGetProcAddressProc>(
  83               base::GetFunctionPointerFromNativeLibrary(
  84                   library, "glXGetProcAddress"));
  85       if (!get_proc_address) {
  86         LOG(ERROR) << "glxGetProcAddress not found.";
  87         base::UnloadNativeLibrary(library);
  88         return false;
  89       }
  90
  91       SetGLGetProcAddressProc(get_proc_address);
  92       AddGLNativeLibrary(library);
  93       SetGLImplementation(kGLImplementationDesktopGL);
  94
  95       InitializeStaticGLBindingsGL();
  96       InitializeStaticGLBindingsGLX();
  97       break;
  98     }
  99     case kGLImplementationEGLGLES2: {
 100       base::NativeLibrary gles_library =
 101           LoadLibraryAndPrintError(kGLESv2LibraryName);
 102       if (!gles_library)
 103         return false;
 104       base::NativeLibrary egl_library =
 105           LoadLibraryAndPrintError(kEGLLibraryName);
 106       if (!egl_library) {
 107         base::UnloadNativeLibrary(gles_library);
 108         return false;
 109       }
 110
 111       GLGetProcAddressProc get_proc_address =
 112           reinterpret_cast<GLGetProcAddressProc>(
 113               base::GetFunctionPointerFromNativeLibrary(
 114                   egl_library, "eglGetProcAddress"));
 115       if (!get_proc_address) {
 116         LOG(ERROR) << "eglGetProcAddress not found.";
 117         base::UnloadNativeLibrary(egl_library);
 118         base::UnloadNativeLibrary(gles_library);
 119         return false;
 120       }
 121
 122       SetGLGetProcAddressProc(get_proc_address);
 123       AddGLNativeLibrary(egl_library);
 124       AddGLNativeLibrary(gles_library);
 125       SetGLImplementation(kGLImplementationEGLGLES2);
 126
 127       InitializeStaticGLBindingsGL();
 128       InitializeStaticGLBindingsEGL();
 129
 130       // These two functions take single precision float rather than double
 131       // precision float parameters in GLES.
 132       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
 133       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
 134       break;
 135     }
 136     case kGLImplementationMockGL: {
 137       SetGLImplementation(kGLImplementationMockGL);
 138       InitializeStaticGLBindingsGL();
 139       break;
 140     }
 141     default:
 142       return false;
 143   }
 144
 145
 146   return true;
 147 }
 148
 149 bool InitializeDynamicGLBindings(GLImplementation implementation,
 150     GLContext* context) {
 151   switch (implementation) {
 152     case kGLImplementationOSMesaGL:
 153       InitializeDynamicGLBindingsGL(context);
 154       InitializeDynamicGLBindingsOSMESA(context);
 155       break;
 156     case kGLImplementationDesktopGL:
 157       InitializeDynamicGLBindingsGL(context);
 158       InitializeDynamicGLBindingsGLX(context);
 159       break;
 160     case kGLImplementationEGLGLES2:
 161       InitializeDynamicGLBindingsGL(context);
 162       InitializeDynamicGLBindingsEGL(context);
 163       break;
 164     case kGLImplementationMockGL:
 165       if (!context) {
 166         scoped_refptr<GLContextStubWithExtensions> mock_context(
 167             new GLContextStubWithExtensions());
 168         mock_context->SetGLVersionString("3.0");
 169         InitializeDynamicGLBindingsGL(mock_context.get());
 170       } else
 171         InitializeDynamicGLBindingsGL(context);
 172       break;
 173     default:
 174       return false;
 175   }
 176
 177   return true;
 178 }
 179
 180 void InitializeDebugGLBindings() {
 181   InitializeDebugGLBindingsEGL();
 182   InitializeDebugGLBindingsGL();
 183   InitializeDebugGLBindingsGLX();
 184   InitializeDebugGLBindingsOSMESA();
 185 }
 186
 187 void ClearGLBindings() {
 188   ClearGLBindingsEGL();
 189   ClearGLBindingsGL();
 190   ClearGLBindingsGLX();
 191   ClearGLBindingsOSMESA();
 192   SetGLImplementation(kGLImplementationNone);
 193
 194   UnloadGLNativeLibraries();
 195 }
 196
 197 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
 198   switch (GetGLImplementation()) {
 199     case kGLImplementationDesktopGL:
 200       return GetGLWindowSystemBindingInfoGLX(info);
 201     case kGLImplementationEGLGLES2:
 202       return GetGLWindowSystemBindingInfoEGL(info);
 203     default:
 204       return false;
 205   }
 206   return false;
 207 }
 208
 209 }  // namespace gfx