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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_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
    210