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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 "ui/gl/gl_implementation.h"
      6 
      7 #include <algorithm>
      8 #include <string>
      9 
     10 #include "base/at_exit.h"
     11 #include "base/command_line.h"
     12 #include "base/logging.h"
     13 #include "ui/gl/gl_bindings.h"
     14 #include "ui/gl/gl_gl_api_implementation.h"
     15 
     16 namespace gfx {
     17 
     18 namespace {
     19 
     20 const struct {
     21   const char* name;
     22   GLImplementation implementation;
     23 } kGLImplementationNamePairs[] = {
     24   { kGLImplementationDesktopName, kGLImplementationDesktopGL },
     25   { kGLImplementationOSMesaName, kGLImplementationOSMesaGL },
     26 #if defined(OS_MACOSX)
     27   { kGLImplementationAppleName, kGLImplementationAppleGL },
     28 #endif
     29   { kGLImplementationEGLName, kGLImplementationEGLGLES2 },
     30   { kGLImplementationMockName, kGLImplementationMockGL }
     31 };
     32 
     33 typedef std::vector<base::NativeLibrary> LibraryArray;
     34 
     35 GLImplementation g_gl_implementation = kGLImplementationNone;
     36 LibraryArray* g_libraries;
     37 GLGetProcAddressProc g_get_proc_address;
     38 
     39 void CleanupNativeLibraries(void* unused) {
     40   if (g_libraries) {
     41     // We do not call base::UnloadNativeLibrary() for these libraries as
     42     // unloading libGL without closing X display is not allowed. See
     43     // crbug.com/250813 for details.
     44     delete g_libraries;
     45     g_libraries = NULL;
     46   }
     47 }
     48 
     49 }
     50 
     51 base::ThreadLocalPointer<GLApi>* g_current_gl_context_tls = NULL;
     52 OSMESAApi* g_current_osmesa_context;
     53 
     54 #if defined(OS_WIN)
     55 
     56 EGLApi* g_current_egl_context;
     57 WGLApi* g_current_wgl_context;
     58 
     59 #elif defined(USE_X11)
     60 
     61 EGLApi* g_current_egl_context;
     62 GLXApi* g_current_glx_context;
     63 
     64 #elif defined(USE_OZONE)
     65 
     66 EGLApi* g_current_egl_context;
     67 
     68 #elif defined(OS_ANDROID)
     69 
     70 EGLApi* g_current_egl_context;
     71 
     72 #endif
     73 
     74 GLImplementation GetNamedGLImplementation(const std::string& name) {
     75   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kGLImplementationNamePairs); ++i) {
     76     if (name == kGLImplementationNamePairs[i].name)
     77       return kGLImplementationNamePairs[i].implementation;
     78   }
     79 
     80   return kGLImplementationNone;
     81 }
     82 
     83 const char* GetGLImplementationName(GLImplementation implementation) {
     84   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kGLImplementationNamePairs); ++i) {
     85     if (implementation == kGLImplementationNamePairs[i].implementation)
     86       return kGLImplementationNamePairs[i].name;
     87   }
     88 
     89   return "unknown";
     90 }
     91 
     92 void SetGLImplementation(GLImplementation implementation) {
     93   g_gl_implementation = implementation;
     94 }
     95 
     96 GLImplementation GetGLImplementation() {
     97   return g_gl_implementation;
     98 }
     99 
    100 bool HasDesktopGLFeatures() {
    101   return kGLImplementationDesktopGL == g_gl_implementation ||
    102          kGLImplementationOSMesaGL == g_gl_implementation ||
    103          kGLImplementationAppleGL == g_gl_implementation;
    104 }
    105 
    106 void AddGLNativeLibrary(base::NativeLibrary library) {
    107   DCHECK(library);
    108 
    109   if (!g_libraries) {
    110     g_libraries = new LibraryArray;
    111     base::AtExitManager::RegisterCallback(CleanupNativeLibraries, NULL);
    112   }
    113 
    114   g_libraries->push_back(library);
    115 }
    116 
    117 void UnloadGLNativeLibraries() {
    118   CleanupNativeLibraries(NULL);
    119 }
    120 
    121 void SetGLGetProcAddressProc(GLGetProcAddressProc proc) {
    122   DCHECK(proc);
    123   g_get_proc_address = proc;
    124 }
    125 
    126 void* GetGLProcAddress(const char* name) {
    127   DCHECK(g_gl_implementation != kGLImplementationNone);
    128 
    129   if (g_libraries) {
    130     for (size_t i = 0; i < g_libraries->size(); ++i) {
    131       void* proc = base::GetFunctionPointerFromNativeLibrary((*g_libraries)[i],
    132                                                              name);
    133       if (proc)
    134         return proc;
    135     }
    136   }
    137   if (g_get_proc_address) {
    138     void* proc = g_get_proc_address(name);
    139     if (proc)
    140       return proc;
    141   }
    142 
    143   return NULL;
    144 }
    145 
    146 void InitializeNullDrawGLBindings() {
    147   // This is platform independent, so it does not need to live in a platform
    148   // specific implementation file.
    149   InitializeNullDrawGLBindingsGL();
    150 }
    151 
    152 bool HasInitializedNullDrawGLBindings() {
    153   return HasInitializedNullDrawGLBindingsGL();
    154 }
    155 
    156 DisableNullDrawGLBindings::DisableNullDrawGLBindings() {
    157   initial_enabled_ = SetNullDrawGLBindingsEnabledGL(false);
    158 }
    159 
    160 DisableNullDrawGLBindings::~DisableNullDrawGLBindings() {
    161   SetNullDrawGLBindingsEnabledGL(initial_enabled_);
    162 }
    163 
    164 GLWindowSystemBindingInfo::GLWindowSystemBindingInfo()
    165     : direct_rendering(true) {}
    166 
    167 }  // namespace gfx
    168