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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/scoped_binders.h"
      6 #include "ui/gl/gl_bindings.h"
      7 #include "ui/gl/gl_context.h"
      8 #include "ui/gl/gl_state_restorer.h"
      9 
     10 namespace gfx {
     11 
     12 ScopedFrameBufferBinder::ScopedFrameBufferBinder(unsigned int fbo)
     13     : state_restorer_(!GLContext::GetCurrent()
     14                           ? NULL
     15                           : GLContext::GetCurrent()->GetGLStateRestorer()),
     16       old_fbo_(-1) {
     17   if (!state_restorer_)
     18     glGetIntegerv(GL_FRAMEBUFFER_BINDING, &old_fbo_);
     19   glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
     20 }
     21 
     22 ScopedFrameBufferBinder::~ScopedFrameBufferBinder() {
     23   if (state_restorer_) {
     24     DCHECK(!!GLContext::GetCurrent());
     25     DCHECK_EQ(state_restorer_, GLContext::GetCurrent()->GetGLStateRestorer());
     26     state_restorer_->RestoreFramebufferBindings();
     27   } else {
     28     glBindFramebufferEXT(GL_FRAMEBUFFER, old_fbo_);
     29   }
     30 }
     31 
     32 ScopedTextureBinder::ScopedTextureBinder(unsigned int target, unsigned int id)
     33     : state_restorer_(!GLContext::GetCurrent()
     34                           ? NULL
     35                           : GLContext::GetCurrent()->GetGLStateRestorer()),
     36       target_(target),
     37       old_id_(-1) {
     38   if (!state_restorer_) {
     39     GLenum target_getter = 0;
     40     switch (target) {
     41       case GL_TEXTURE_2D:
     42         target_getter = GL_TEXTURE_BINDING_2D;
     43         break;
     44       case GL_TEXTURE_CUBE_MAP:
     45         target_getter = GL_TEXTURE_BINDING_CUBE_MAP;
     46         break;
     47       case GL_TEXTURE_EXTERNAL_OES:
     48         target_getter = GL_TEXTURE_BINDING_EXTERNAL_OES;
     49         break;
     50       default:
     51         NOTIMPLEMENTED() << "Target not part of OpenGL ES 2.0 spec.";
     52     }
     53     glGetIntegerv(target_getter, &old_id_);
     54   }
     55   glBindTexture(target_, id);
     56 }
     57 
     58 ScopedTextureBinder::~ScopedTextureBinder() {
     59   if (state_restorer_) {
     60     DCHECK(!!GLContext::GetCurrent());
     61     DCHECK_EQ(state_restorer_, GLContext::GetCurrent()->GetGLStateRestorer());
     62     state_restorer_->RestoreActiveTextureUnitBinding(target_);
     63   } else {
     64     glBindTexture(target_, old_id_);
     65   }
     66 }
     67 
     68 }  // namespace gfx
     69