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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gl/scoped_binders.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context.h"
#include "ui/gl/gl_state_restorer.h"
namespace gfx {
ScopedFrameBufferBinder::ScopedFrameBufferBinder(unsigned int fbo)
: state_restorer_(!GLContext::GetCurrent()
? NULL
: GLContext::GetCurrent()->GetGLStateRestorer()),
old_fbo_(-1) {
if (!state_restorer_)
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &old_fbo_);
glBindFramebufferEXT(GL_FRAMEBUFFER, fbo);
}
ScopedFrameBufferBinder::~ScopedFrameBufferBinder() {
if (state_restorer_) {
DCHECK(!!GLContext::GetCurrent());
DCHECK_EQ(state_restorer_, GLContext::GetCurrent()->GetGLStateRestorer());
state_restorer_->RestoreFramebufferBindings();
} else {
glBindFramebufferEXT(GL_FRAMEBUFFER, old_fbo_);
}
}
ScopedTextureBinder::ScopedTextureBinder(unsigned int target, unsigned int id)
: state_restorer_(!GLContext::GetCurrent()
? NULL
: GLContext::GetCurrent()->GetGLStateRestorer()),
target_(target),
old_id_(-1) {
if (!state_restorer_) {
GLenum target_getter = 0;
switch (target) {
case GL_TEXTURE_2D:
target_getter = GL_TEXTURE_BINDING_2D;
break;
case GL_TEXTURE_CUBE_MAP:
target_getter = GL_TEXTURE_BINDING_CUBE_MAP;
break;
default:
NOTIMPLEMENTED() << "Target not part of OpenGL ES 2.0 spec.";
}
glGetIntegerv(target_getter, &old_id_);
}
glBindTexture(target_, id);
}
ScopedTextureBinder::~ScopedTextureBinder() {
if (state_restorer_) {
DCHECK(!!GLContext::GetCurrent());
DCHECK_EQ(state_restorer_, GLContext::GetCurrent()->GetGLStateRestorer());
state_restorer_->RestoreAllTextureUnitBindings();
} else {
glBindTexture(target_, old_id_);
}
}
} // namespace gfx
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