ui/gl/gl_context_egl.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 "ui/gl/gl_context_egl.h"
   6
   7 #include "base/debug/trace_event.h"
   8 #include "base/logging.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "build/build_config.h"
  11 #include "third_party/khronos/EGL/egl.h"
  12 #include "third_party/khronos/EGL/eglext.h"
  13 #include "ui/gl/egl_util.h"
  14 #include "ui/gl/gl_bindings.h"
  15 #include "ui/gl/gl_surface_egl.h"
  16
  17 #if defined(USE_X11)
  18 extern "C" {
  19 #include <X11/Xlib.h>
  20 }
  21 #endif
  22
  23 using ui::GetLastEGLErrorString;
  24
  25 namespace gfx {
  26
  27 GLContextEGL::GLContextEGL(GLShareGroup* share_group)
  28     : GLContextReal(share_group),
  29       context_(NULL),
  30       display_(NULL),
  31       config_(NULL),
  32       unbind_fbo_on_makecurrent_(false) {
  33 }
  34
  35 bool GLContextEGL::Initialize(
  36     GLSurface* compatible_surface, GpuPreference gpu_preference) {
  37   DCHECK(compatible_surface);
  38   DCHECK(!context_);
  39
  40   static const EGLint kContextAttributes[] = {
  41     EGL_CONTEXT_CLIENT_VERSION, 2,
  42     EGL_NONE
  43   };
  44   static const EGLint kContextRobustnessAttributes[] = {
  45     EGL_CONTEXT_CLIENT_VERSION, 2,
  46     EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT,
  47     EGL_LOSE_CONTEXT_ON_RESET_EXT,
  48     EGL_NONE
  49   };
  50
  51   display_ = compatible_surface->GetDisplay();
  52   config_ = compatible_surface->GetConfig();
  53
  54   const EGLint* context_attributes = NULL;
  55   if (GLSurfaceEGL::IsCreateContextRobustnessSupported()) {
  56     DVLOG(1) << "EGL_EXT_create_context_robustness supported.";
  57     context_attributes = kContextRobustnessAttributes;
  58   } else {
  59     // At some point we should require the presence of the robustness
  60     // extension and remove this code path.
  61     DVLOG(1) << "EGL_EXT_create_context_robustness NOT supported.";
  62     context_attributes = kContextAttributes;
  63   }
  64
  65   context_ = eglCreateContext(
  66       display_,
  67       config_,
  68       share_group() ? share_group()->GetHandle() : NULL,
  69       context_attributes);
  70
  71   if (!context_) {
  72     LOG(ERROR) << "eglCreateContext failed with error "
  73                << GetLastEGLErrorString();
  74     return false;
  75   }
  76
  77   return true;
  78 }
  79
  80 void GLContextEGL::Destroy() {
  81   if (context_) {
  82     if (!eglDestroyContext(display_, context_)) {
  83       LOG(ERROR) << "eglDestroyContext failed with error "
  84                  << GetLastEGLErrorString();
  85     }
  86
  87     context_ = NULL;
  88   }
  89 }
  90
  91 bool GLContextEGL::MakeCurrent(GLSurface* surface) {
  92   DCHECK(context_);
  93   if (IsCurrent(surface))
  94       return true;
  95
  96   ScopedReleaseCurrent release_current;
  97   TRACE_EVENT2("gpu", "GLContextEGL::MakeCurrent",
  98                "context", context_,
  99                "surface", surface);
 100
 101   if (unbind_fbo_on_makecurrent_ &&
 102       eglGetCurrentContext() != EGL_NO_CONTEXT) {
 103     glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
 104   }
 105
 106   if (!eglMakeCurrent(display_,
 107                       surface->GetHandle(),
 108                       surface->GetHandle(),
 109                       context_)) {
 110     DVLOG(1) << "eglMakeCurrent failed with error "
 111              << GetLastEGLErrorString();
 112     return false;
 113   }
 114
 115   // Set this as soon as the context is current, since we might call into GL.
 116   SetRealGLApi();
 117
 118   SetCurrent(surface);
 119   if (!InitializeDynamicBindings()) {
 120     return false;
 121   }
 122
 123   if (!surface->OnMakeCurrent(this)) {
 124     LOG(ERROR) << "Could not make current.";
 125     return false;
 126   }
 127
 128   release_current.Cancel();
 129   return true;
 130 }
 131
 132 void GLContextEGL::SetUnbindFboOnMakeCurrent() {
 133   unbind_fbo_on_makecurrent_ = true;
 134 }
 135
 136 void GLContextEGL::ReleaseCurrent(GLSurface* surface) {
 137   if (!IsCurrent(surface))
 138     return;
 139
 140   if (unbind_fbo_on_makecurrent_)
 141     glBindFramebufferEXT(GL_FRAMEBUFFER, 0);
 142
 143   SetCurrent(NULL);
 144   eglMakeCurrent(display_,
 145                  EGL_NO_SURFACE,
 146                  EGL_NO_SURFACE,
 147                  EGL_NO_CONTEXT);
 148 }
 149
 150 bool GLContextEGL::IsCurrent(GLSurface* surface) {
 151   DCHECK(context_);
 152
 153   bool native_context_is_current = context_ == eglGetCurrentContext();
 154
 155   // If our context is current then our notion of which GLContext is
 156   // current must be correct. On the other hand, third-party code
 157   // using OpenGL might change the current context.
 158   DCHECK(!native_context_is_current || (GetRealCurrent() == this));
 159
 160   if (!native_context_is_current)
 161     return false;
 162
 163   if (surface) {
 164     if (surface->GetHandle() != eglGetCurrentSurface(EGL_DRAW))
 165       return false;
 166   }
 167
 168   return true;
 169 }
 170
 171 void* GLContextEGL::GetHandle() {
 172   return context_;
 173 }
 174
 175 void GLContextEGL::SetSwapInterval(int interval) {
 176   DCHECK(IsCurrent(NULL));
 177   if (!eglSwapInterval(display_, interval)) {
 178     LOG(ERROR) << "eglSwapInterval failed with error "
 179                << GetLastEGLErrorString();
 180   }
 181 }
 182
 183 std::string GLContextEGL::GetExtensions() {
 184   const char* extensions = eglQueryString(display_,
 185                                           EGL_EXTENSIONS);
 186   if (!extensions)
 187     return GLContext::GetExtensions();
 188
 189   return GLContext::GetExtensions() + " " + extensions;
 190 }
 191
 192 bool GLContextEGL::WasAllocatedUsingRobustnessExtension() {
 193   return GLSurfaceEGL::IsCreateContextRobustnessSupported();
 194 }
 195
 196 GLContextEGL::~GLContextEGL() {
 197   Destroy();
 198 }
 199
 200 #if !defined(OS_ANDROID)
 201 bool GLContextEGL::GetTotalGpuMemory(size_t* bytes) {
 202   DCHECK(bytes);
 203   *bytes = 0;
 204   return false;
 205 }
 206 #endif
 207
 208 }  // namespace gfx