blob: bee5b623750b9e4e2e8e8f8bf9b09677386eb8a3 [file] [log] [blame]
/*
* Copyright (C) 2009-2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WebGLFramebuffer.h"
#if ENABLE(WEBGL)
#include "ExtensionsGL.h"
#include "WebGLContextGroup.h"
#include "WebGLDrawBuffers.h"
#include "WebGLRenderingContextBase.h"
namespace WebCore {
namespace {
class WebGLRenderbufferAttachment : public WebGLFramebuffer::WebGLAttachment {
public:
static Ref<WebGLFramebuffer::WebGLAttachment> create(WebGLRenderbuffer*);
private:
WebGLRenderbufferAttachment(WebGLRenderbuffer*);
#if !USE(ANGLE)
GCGLsizei getWidth() const override;
GCGLsizei getHeight() const override;
GCGLenum getFormat() const override;
#endif
WebGLSharedObject* getObject() const override;
bool isSharedObject(WebGLSharedObject*) const override;
bool isValid() const override;
bool isInitialized() const override;
void setInitialized() override;
void onDetached(GraphicsContextGLOpenGL*) override;
void attach(GraphicsContextGLOpenGL*, GCGLenum attachment) override;
void unattach(GraphicsContextGLOpenGL*, GCGLenum attachment) override;
WebGLRenderbufferAttachment() { };
RefPtr<WebGLRenderbuffer> m_renderbuffer;
};
Ref<WebGLFramebuffer::WebGLAttachment> WebGLRenderbufferAttachment::create(WebGLRenderbuffer* renderbuffer)
{
return adoptRef(*new WebGLRenderbufferAttachment(renderbuffer));
}
WebGLRenderbufferAttachment::WebGLRenderbufferAttachment(WebGLRenderbuffer* renderbuffer)
: m_renderbuffer(renderbuffer)
{
}
#if !USE(ANGLE)
GCGLsizei WebGLRenderbufferAttachment::getWidth() const
{
return m_renderbuffer->getWidth();
}
GCGLsizei WebGLRenderbufferAttachment::getHeight() const
{
return m_renderbuffer->getHeight();
}
GCGLenum WebGLRenderbufferAttachment::getFormat() const
{
return m_renderbuffer->getInternalFormat();
}
#endif
WebGLSharedObject* WebGLRenderbufferAttachment::getObject() const
{
return m_renderbuffer->object() ? m_renderbuffer.get() : 0;
}
bool WebGLRenderbufferAttachment::isSharedObject(WebGLSharedObject* object) const
{
return object == m_renderbuffer;
}
bool WebGLRenderbufferAttachment::isValid() const
{
return m_renderbuffer->object();
}
bool WebGLRenderbufferAttachment::isInitialized() const
{
return m_renderbuffer->object() && m_renderbuffer->isInitialized();
}
void WebGLRenderbufferAttachment::setInitialized()
{
if (m_renderbuffer->object())
m_renderbuffer->setInitialized();
}
void WebGLRenderbufferAttachment::onDetached(GraphicsContextGLOpenGL* context)
{
m_renderbuffer->onDetached(context);
}
void WebGLRenderbufferAttachment::attach(GraphicsContextGLOpenGL* context, GCGLenum attachment)
{
PlatformGLObject object = objectOrZero(m_renderbuffer.get());
context->framebufferRenderbuffer(GraphicsContextGL::FRAMEBUFFER, attachment, GraphicsContextGL::RENDERBUFFER, object);
}
void WebGLRenderbufferAttachment::unattach(GraphicsContextGLOpenGL* context, GCGLenum attachment)
{
#if !USE(ANGLE)
if (attachment == GraphicsContextGL::DEPTH_STENCIL_ATTACHMENT) {
context->framebufferRenderbuffer(GraphicsContextGL::FRAMEBUFFER, GraphicsContextGL::DEPTH_ATTACHMENT, GraphicsContextGL::RENDERBUFFER, 0);
context->framebufferRenderbuffer(GraphicsContextGL::FRAMEBUFFER, GraphicsContextGL::STENCIL_ATTACHMENT, GraphicsContextGL::RENDERBUFFER, 0);
} else
#endif
context->framebufferRenderbuffer(GraphicsContextGL::FRAMEBUFFER, attachment, GraphicsContextGL::RENDERBUFFER, 0);
}
class WebGLTextureAttachment : public WebGLFramebuffer::WebGLAttachment {
public:
static Ref<WebGLFramebuffer::WebGLAttachment> create(WebGLTexture*, GCGLenum target, GCGLint level);
private:
WebGLTextureAttachment(WebGLTexture*, GCGLenum target, GCGLint level);
#if !USE(ANGLE)
GCGLsizei getWidth() const override;
GCGLsizei getHeight() const override;
GCGLenum getFormat() const override;
#endif
WebGLSharedObject* getObject() const override;
bool isSharedObject(WebGLSharedObject*) const override;
bool isValid() const override;
bool isInitialized() const override;
void setInitialized() override;
void onDetached(GraphicsContextGLOpenGL*) override;
void attach(GraphicsContextGLOpenGL*, GCGLenum attachment) override;
void unattach(GraphicsContextGLOpenGL*, GCGLenum attachment) override;
WebGLTextureAttachment() { };
RefPtr<WebGLTexture> m_texture;
GCGLenum m_target;
GCGLint m_level;
};
Ref<WebGLFramebuffer::WebGLAttachment> WebGLTextureAttachment::create(WebGLTexture* texture, GCGLenum target, GCGLint level)
{
return adoptRef(*new WebGLTextureAttachment(texture, target, level));
}
WebGLTextureAttachment::WebGLTextureAttachment(WebGLTexture* texture, GCGLenum target, GCGLint level)
: m_texture(texture)
, m_target(target)
, m_level(level)
{
}
#if !USE(ANGLE)
GCGLsizei WebGLTextureAttachment::getWidth() const
{
return m_texture->getWidth(m_target, m_level);
}
GCGLsizei WebGLTextureAttachment::getHeight() const
{
return m_texture->getHeight(m_target, m_level);
}
GCGLenum WebGLTextureAttachment::getFormat() const
{
return m_texture->getInternalFormat(m_target, m_level);
}
#endif
WebGLSharedObject* WebGLTextureAttachment::getObject() const
{
return m_texture->object() ? m_texture.get() : 0;
}
bool WebGLTextureAttachment::isSharedObject(WebGLSharedObject* object) const
{
return object == m_texture;
}
bool WebGLTextureAttachment::isValid() const
{
return m_texture->object();
}
bool WebGLTextureAttachment::isInitialized() const
{
// Textures are assumed to be initialized.
return true;
}
void WebGLTextureAttachment::setInitialized()
{
// Textures are assumed to be initialized.
}
void WebGLTextureAttachment::onDetached(GraphicsContextGLOpenGL* context)
{
m_texture->onDetached(context);
}
void WebGLTextureAttachment::attach(GraphicsContextGLOpenGL* context, GCGLenum attachment)
{
PlatformGLObject object = objectOrZero(m_texture.get());
context->framebufferTexture2D(GraphicsContextGL::FRAMEBUFFER, attachment, m_target, object, m_level);
}
void WebGLTextureAttachment::unattach(GraphicsContextGLOpenGL* context, GCGLenum attachment)
{
#if !USE(ANGLE)
if (attachment == GraphicsContextGL::DEPTH_STENCIL_ATTACHMENT) {
context->framebufferTexture2D(GraphicsContextGL::FRAMEBUFFER, GraphicsContextGL::DEPTH_ATTACHMENT, m_target, 0, m_level);
context->framebufferTexture2D(GraphicsContextGL::FRAMEBUFFER, GraphicsContextGL::STENCIL_ATTACHMENT, m_target, 0, m_level);
} else
#endif
context->framebufferTexture2D(GraphicsContextGL::FRAMEBUFFER, attachment, m_target, 0, m_level);
}
#if !USE(ANGLE)
bool isAttachmentComplete(WebGLFramebuffer::WebGLAttachment* attachedObject, GCGLenum attachment, const char** reason)
{
ASSERT(attachedObject && attachedObject->isValid());
ASSERT(reason);
GCGLenum format = attachedObject->getFormat();
unsigned need = GraphicsContextGLOpenGL::getClearBitsByAttachmentType(attachment);
unsigned have = GraphicsContextGLOpenGL::getClearBitsByFormat(format);
if ((need & have) != need) {
*reason = "attachment type is not correct for attachment";
return false;
}
if (!attachedObject->getWidth() || !attachedObject->getHeight()) {
*reason = "attachment has a 0 dimension";
return false;
}
if ((attachment == GraphicsContextGL::DEPTH_ATTACHMENT || attachment == GraphicsContextGL::STENCIL_ATTACHMENT)
&& format == GraphicsContextGL::DEPTH_STENCIL) {
*reason = "attachment DEPTH_STENCIL not allowed on DEPTH or STENCIL attachment";
return false;
}
return true;
}
#endif
} // anonymous namespace
WebGLFramebuffer::WebGLAttachment::WebGLAttachment() = default;
WebGLFramebuffer::WebGLAttachment::~WebGLAttachment() = default;
Ref<WebGLFramebuffer> WebGLFramebuffer::create(WebGLRenderingContextBase& ctx)
{
return adoptRef(*new WebGLFramebuffer(ctx));
}
WebGLFramebuffer::WebGLFramebuffer(WebGLRenderingContextBase& ctx)
: WebGLContextObject(ctx)
, m_hasEverBeenBound(false)
{
setObject(ctx.graphicsContextGL()->createFramebuffer());
}
WebGLFramebuffer::~WebGLFramebuffer()
{
deleteObject(0);
}
void WebGLFramebuffer::setAttachmentForBoundFramebuffer(GCGLenum attachment, GCGLenum texTarget, WebGLTexture* texture, GCGLint level)
{
ASSERT(isBound());
removeAttachmentFromBoundFramebuffer(attachment);
if (!object())
return;
if (texture && texture->object()) {
m_attachments.add(attachment, WebGLTextureAttachment::create(texture, texTarget, level));
drawBuffersIfNecessary(false);
texture->onAttached();
}
}
void WebGLFramebuffer::setAttachmentForBoundFramebuffer(GCGLenum attachment, WebGLRenderbuffer* renderbuffer)
{
ASSERT(isBound());
removeAttachmentFromBoundFramebuffer(attachment);
if (!object())
return;
if (renderbuffer && renderbuffer->object()) {
m_attachments.add(attachment, WebGLRenderbufferAttachment::create(renderbuffer));
drawBuffersIfNecessary(false);
renderbuffer->onAttached();
}
}
void WebGLFramebuffer::attach(GCGLenum attachment, GCGLenum attachmentPoint)
{
ASSERT(isBound());
RefPtr<WebGLAttachment> attachmentObject = getAttachment(attachment);
if (attachmentObject)
attachmentObject->attach(context()->graphicsContextGL(), attachmentPoint);
}
WebGLSharedObject* WebGLFramebuffer::getAttachmentObject(GCGLenum attachment) const
{
if (!object())
return 0;
RefPtr<WebGLAttachment> attachmentObject = getAttachment(attachment);
return attachmentObject ? attachmentObject->getObject() : 0;
}
WebGLFramebuffer::WebGLAttachment* WebGLFramebuffer::getAttachment(GCGLenum attachment) const
{
const AttachmentMap::const_iterator it = m_attachments.find(attachment);
return (it != m_attachments.end()) ? it->value.get() : 0;
}
void WebGLFramebuffer::removeAttachmentFromBoundFramebuffer(GCGLenum attachment)
{
ASSERT(isBound());
if (!object())
return;
RefPtr<WebGLAttachment> attachmentObject = getAttachment(attachment);
if (attachmentObject) {
attachmentObject->onDetached(context()->graphicsContextGL());
m_attachments.remove(attachment);
drawBuffersIfNecessary(false);
#if !USE(ANGLE)
switch (attachment) {
case GraphicsContextGL::DEPTH_STENCIL_ATTACHMENT:
attach(GraphicsContextGL::DEPTH_ATTACHMENT, GraphicsContextGL::DEPTH_ATTACHMENT);
attach(GraphicsContextGL::STENCIL_ATTACHMENT, GraphicsContextGL::STENCIL_ATTACHMENT);
break;
case GraphicsContextGL::DEPTH_ATTACHMENT:
attach(GraphicsContextGL::DEPTH_STENCIL_ATTACHMENT, GraphicsContextGL::DEPTH_ATTACHMENT);
break;
case GraphicsContextGL::STENCIL_ATTACHMENT:
attach(GraphicsContextGL::DEPTH_STENCIL_ATTACHMENT, GraphicsContextGL::STENCIL_ATTACHMENT);
break;
}
#endif
}
}
void WebGLFramebuffer::removeAttachmentFromBoundFramebuffer(WebGLSharedObject* attachment)
{
ASSERT(isBound());
if (!object())
return;
if (!attachment)
return;
bool checkMore = true;
do {
checkMore = false;
for (auto& entry : m_attachments) {
RefPtr<WebGLAttachment> attachmentObject = entry.value.get();
if (attachmentObject->isSharedObject(attachment)) {
GCGLenum attachmentType = entry.key;
attachmentObject->unattach(context()->graphicsContextGL(), attachmentType);
removeAttachmentFromBoundFramebuffer(attachmentType);
checkMore = true;
break;
}
}
} while (checkMore);
}
#if !USE(ANGLE)
GCGLsizei WebGLFramebuffer::getColorBufferWidth() const
{
if (!object())
return 0;
RefPtr<WebGLAttachment> attachment = getAttachment(GraphicsContextGL::COLOR_ATTACHMENT0);
if (!attachment)
return 0;
return attachment->getWidth();
}
GCGLsizei WebGLFramebuffer::getColorBufferHeight() const
{
if (!object())
return 0;
RefPtr<WebGLAttachment> attachment = getAttachment(GraphicsContextGL::COLOR_ATTACHMENT0);
if (!attachment)
return 0;
return attachment->getHeight();
}
GCGLenum WebGLFramebuffer::getColorBufferFormat() const
{
if (!object())
return 0;
RefPtr<WebGLAttachment> attachment = getAttachment(GraphicsContextGL::COLOR_ATTACHMENT0);
if (!attachment)
return 0;
return attachment->getFormat();
}
GCGLenum WebGLFramebuffer::checkStatus(const char** reason) const
{
unsigned int count = 0;
GCGLsizei width = 0, height = 0;
bool haveDepth = false;
bool haveStencil = false;
bool haveDepthStencil = false;
for (auto& entry : m_attachments) {
RefPtr<WebGLAttachment> attachment = entry.value.get();
if (!isAttachmentComplete(attachment.get(), entry.key, reason))
return GraphicsContextGL::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
if (!attachment->isValid()) {
*reason = "attachment is not valid";
return GraphicsContextGL::FRAMEBUFFER_UNSUPPORTED;
}
GCGLenum attachmentFormat = attachment->getFormat();
// Attaching an SRGB_EXT format attachment to a framebuffer is invalid.
if (attachmentFormat == ExtensionsGL::SRGB_EXT)
attachmentFormat = 0;
if (!attachmentFormat) {
*reason = "attachment is an unsupported format";
return GraphicsContextGL::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
}
switch (entry.key) {
case GraphicsContextGL::DEPTH_ATTACHMENT:
haveDepth = true;
break;
case GraphicsContextGL::STENCIL_ATTACHMENT:
haveStencil = true;
break;
case GraphicsContextGL::DEPTH_STENCIL_ATTACHMENT:
haveDepthStencil = true;
break;
}
if (!count) {
width = attachment->getWidth();
height = attachment->getHeight();
} else {
if (width != attachment->getWidth() || height != attachment->getHeight()) {
*reason = "attachments do not have the same dimensions";
return GraphicsContextGL::FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
}
}
++count;
}
if (!count) {
*reason = "no attachments";
return GraphicsContextGL::FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT;
}
if (!width || !height) {
*reason = "framebuffer has a 0 dimension";
return GraphicsContextGL::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
}
// WebGL specific: no conflicting DEPTH/STENCIL/DEPTH_STENCIL attachments.
if ((haveDepthStencil && (haveDepth || haveStencil)) || (haveDepth && haveStencil)) {
*reason = "conflicting DEPTH/STENCIL/DEPTH_STENCIL attachments";
return GraphicsContextGL::FRAMEBUFFER_UNSUPPORTED;
}
return GraphicsContextGL::FRAMEBUFFER_COMPLETE;
}
bool WebGLFramebuffer::onAccess(GraphicsContextGLOpenGL* context3d, const char** reason)
{
if (checkStatus(reason) != GraphicsContextGL::FRAMEBUFFER_COMPLETE)
return false;
return initializeAttachments(context3d, reason);
}
#endif
bool WebGLFramebuffer::hasStencilBuffer() const
{
RefPtr<WebGLAttachment> attachment = getAttachment(GraphicsContextGL::STENCIL_ATTACHMENT);
if (!attachment)
attachment = getAttachment(GraphicsContextGL::DEPTH_STENCIL_ATTACHMENT);
return attachment && attachment->isValid();
}
void WebGLFramebuffer::deleteObjectImpl(GraphicsContextGLOpenGL* context3d, PlatformGLObject object)
{
for (auto& attachment : m_attachments.values())
attachment->onDetached(context3d);
context3d->deleteFramebuffer(object);
}
bool WebGLFramebuffer::initializeAttachments(GraphicsContextGLOpenGL* g3d, const char** reason)
{
ASSERT(object());
GCGLbitfield mask = 0;
for (auto& entry : m_attachments) {
GCGLenum attachmentType = entry.key;
RefPtr<WebGLAttachment> attachment = entry.value.get();
if (!attachment->isInitialized())
mask |= GraphicsContextGLOpenGL::getClearBitsByAttachmentType(attachmentType);
}
if (!mask)
return true;
// We only clear un-initialized renderbuffers when they are ready to be
// read, i.e., when the framebuffer is complete.
if (g3d->checkFramebufferStatus(GraphicsContextGL::FRAMEBUFFER) != GraphicsContextGL::FRAMEBUFFER_COMPLETE) {
*reason = "framebuffer not complete";
return false;
}
bool initColor = mask & GraphicsContextGL::COLOR_BUFFER_BIT;
bool initDepth = mask & GraphicsContextGL::DEPTH_BUFFER_BIT;
bool initStencil = mask & GraphicsContextGL::STENCIL_BUFFER_BIT;
GCGLfloat colorClearValue[] = {0, 0, 0, 0}, depthClearValue = 0;
GCGLint stencilClearValue = 0;
GCGLboolean colorMask[] = {0, 0, 0, 0}, depthMask = 0;
GCGLuint stencilMask = 0xffffffff;
GCGLboolean isScissorEnabled = 0;
GCGLboolean isDitherEnabled = 0;
if (initColor) {
g3d->getFloatv(GraphicsContextGL::COLOR_CLEAR_VALUE, colorClearValue);
g3d->getBooleanv(GraphicsContextGL::COLOR_WRITEMASK, colorMask);
g3d->clearColor(0, 0, 0, 0);
g3d->colorMask(true, true, true, true);
}
if (initDepth) {
g3d->getFloatv(GraphicsContextGL::DEPTH_CLEAR_VALUE, &depthClearValue);
g3d->getBooleanv(GraphicsContextGL::DEPTH_WRITEMASK, &depthMask);
g3d->clearDepth(1.0f);
g3d->depthMask(true);
}
if (initStencil) {
g3d->getIntegerv(GraphicsContextGL::STENCIL_CLEAR_VALUE, &stencilClearValue);
g3d->getIntegerv(GraphicsContextGL::STENCIL_WRITEMASK, reinterpret_cast<GCGLint*>(&stencilMask));
g3d->clearStencil(0);
g3d->stencilMask(0xffffffff);
}
isScissorEnabled = g3d->isEnabled(GraphicsContextGL::SCISSOR_TEST);
g3d->disable(GraphicsContextGL::SCISSOR_TEST);
isDitherEnabled = g3d->isEnabled(GraphicsContextGL::DITHER);
g3d->disable(GraphicsContextGL::DITHER);
g3d->clear(mask);
if (initColor) {
g3d->clearColor(colorClearValue[0], colorClearValue[1], colorClearValue[2], colorClearValue[3]);
g3d->colorMask(colorMask[0], colorMask[1], colorMask[2], colorMask[3]);
}
if (initDepth) {
g3d->clearDepth(depthClearValue);
g3d->depthMask(depthMask);
}
if (initStencil) {
g3d->clearStencil(stencilClearValue);
g3d->stencilMask(stencilMask);
}
if (isScissorEnabled)
g3d->enable(GraphicsContextGL::SCISSOR_TEST);
else
g3d->disable(GraphicsContextGL::SCISSOR_TEST);
if (isDitherEnabled)
g3d->enable(GraphicsContextGL::DITHER);
else
g3d->disable(GraphicsContextGL::DITHER);
for (AttachmentMap::iterator it = m_attachments.begin(); it != m_attachments.end(); ++it) {
GCGLenum attachmentType = it->key;
auto attachment = it->value;
GCGLbitfield bits = GraphicsContextGLOpenGL::getClearBitsByAttachmentType(attachmentType);
if (bits & mask)
attachment->setInitialized();
}
return true;
}
bool WebGLFramebuffer::isBound() const
{
return (context()->m_framebufferBinding.get() == this) || (context()->m_readFramebufferBinding.get() == this);
}
void WebGLFramebuffer::drawBuffers(const Vector<GCGLenum>& bufs)
{
m_drawBuffers = bufs;
m_filteredDrawBuffers.resize(m_drawBuffers.size());
for (auto& buffer : m_filteredDrawBuffers)
buffer = GraphicsContextGL::NONE;
drawBuffersIfNecessary(true);
}
void WebGLFramebuffer::drawBuffersIfNecessary(bool force)
{
#if ENABLE(WEBGL2)
// FIXME: The logic here seems wrong. If we don't have WebGL 2 enabled at all, then
// we skip the m_webglDrawBuffers check. But if we do have WebGL 2 enabled, then we
// perform this check, for WebGL 1 contexts only.
if (!context()->m_webglDrawBuffers && !context()->isWebGL2())
return;
#endif
bool reset = force;
// This filtering works around graphics driver bugs on Mac OS X.
for (size_t i = 0; i < m_drawBuffers.size(); ++i) {
if (m_drawBuffers[i] != GraphicsContextGL::NONE && getAttachment(m_drawBuffers[i])) {
if (m_filteredDrawBuffers[i] != m_drawBuffers[i]) {
m_filteredDrawBuffers[i] = m_drawBuffers[i];
reset = true;
}
} else {
if (m_filteredDrawBuffers[i] != GraphicsContextGL::NONE) {
m_filteredDrawBuffers[i] = GraphicsContextGL::NONE;
reset = true;
}
}
}
if (reset) {
context()->graphicsContextGL()->getExtensions().drawBuffersEXT(
m_filteredDrawBuffers.size(), m_filteredDrawBuffers.data());
}
}
GCGLenum WebGLFramebuffer::getDrawBuffer(GCGLenum drawBuffer)
{
int index = static_cast<int>(drawBuffer - ExtensionsGL::DRAW_BUFFER0_EXT);
ASSERT(index >= 0);
if (index < static_cast<int>(m_drawBuffers.size()))
return m_drawBuffers[index];
if (drawBuffer == ExtensionsGL::DRAW_BUFFER0_EXT)
return GraphicsContextGL::COLOR_ATTACHMENT0;
return GraphicsContextGL::NONE;
}
}
#endif // ENABLE(WEBGL)