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      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_egl_api_implementation.h"
     12 #include "ui/gl/gl_gl_api_implementation.h"
     13 #include "ui/gl/gl_glx_api_implementation.h"
     14 #include "ui/gl/gl_implementation.h"
     15 #include "ui/gl/gl_implementation_linux.h"
     16 #include "ui/gl/gl_osmesa_api_implementation.h"
     17 #include "ui/gl/gl_switches.h"
     18 
     19 namespace gfx {
     20 namespace {
     21 
     22 // TODO(piman): it should be Desktop GL marshalling from double to float. Today
     23 // on native GLES, we do float->double->float.
     24 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
     25   glClearDepthf(static_cast<GLclampf>(depth));
     26 }
     27 
     28 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
     29                                                     GLclampd z_far) {
     30   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
     31 }
     32 
     33 }  // namespace
     34 
     35 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
     36   impls->push_back(kGLImplementationDesktopGL);
     37   impls->push_back(kGLImplementationEGLGLES2);
     38   impls->push_back(kGLImplementationOSMesaGL);
     39 }
     40 
     41 bool InitializeGLBindings(GLImplementation implementation) {
     42   // Prevent reinitialization with a different implementation. Once the gpu
     43   // unit tests have initialized with kGLImplementationMock, we don't want to
     44   // later switch to another GL implementation.
     45   if (GetGLImplementation() != kGLImplementationNone)
     46     return true;
     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 InitializeGLBindingsOSMesaGL();
     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       InitializeGLBindingsGL();
     91       InitializeGLBindingsGLX();
     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       InitializeGLBindingsGL();
    121       InitializeGLBindingsEGL();
    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       SetGLGetProcAddressProc(GetMockGLProcAddress);
    131       SetGLImplementation(kGLImplementationMockGL);
    132       InitializeGLBindingsGL();
    133       break;
    134     }
    135     default:
    136       return false;
    137   }
    138 
    139 
    140   return true;
    141 }
    142 
    143 bool InitializeGLExtensionBindings(GLImplementation implementation,
    144     GLContext* context) {
    145   switch (implementation) {
    146     case kGLImplementationOSMesaGL:
    147       InitializeGLExtensionBindingsGL(context);
    148       InitializeGLExtensionBindingsOSMESA(context);
    149       break;
    150     case kGLImplementationDesktopGL:
    151       InitializeGLExtensionBindingsGL(context);
    152       InitializeGLExtensionBindingsGLX(context);
    153       break;
    154     case kGLImplementationEGLGLES2:
    155       InitializeGLExtensionBindingsGL(context);
    156       InitializeGLExtensionBindingsEGL(context);
    157       break;
    158     case kGLImplementationMockGL:
    159       InitializeGLExtensionBindingsGL(context);
    160       break;
    161     default:
    162       return false;
    163   }
    164 
    165   return true;
    166 }
    167 
    168 void InitializeDebugGLBindings() {
    169   InitializeDebugGLBindingsEGL();
    170   InitializeDebugGLBindingsGL();
    171   InitializeDebugGLBindingsGLX();
    172   InitializeDebugGLBindingsOSMESA();
    173 }
    174 
    175 void ClearGLBindings() {
    176   ClearGLBindingsEGL();
    177   ClearGLBindingsGL();
    178   ClearGLBindingsGLX();
    179   ClearGLBindingsOSMESA();
    180   SetGLImplementation(kGLImplementationNone);
    181 
    182   UnloadGLNativeLibraries();
    183 }
    184 
    185 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
    186   switch (GetGLImplementation()) {
    187     case kGLImplementationDesktopGL:
    188       return GetGLWindowSystemBindingInfoGLX(info);
    189     case kGLImplementationEGLGLES2:
    190       return GetGLWindowSystemBindingInfoEGL(info);
    191     default:
    192       return false;
    193   }
    194   return false;
    195 }
    196 
    197 }  // namespace gfx
    198