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/*
* Copyright (C) 2013 Google 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 AND ITS CONTRIBUTORS "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 OR ITS 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"
#if ENABLE(WEBGL)
#include "EXTDrawBuffers.h"
#include "Extensions3D.h"
namespace WebCore {
EXTDrawBuffers::EXTDrawBuffers(WebGLRenderingContext* context)
: WebGLExtension(context)
{
}
EXTDrawBuffers::~EXTDrawBuffers()
{
}
WebGLExtension::ExtensionName EXTDrawBuffers::getName() const
{
return WebGLExtension::EXTDrawBuffersName;
}
PassOwnPtr<EXTDrawBuffers> EXTDrawBuffers::create(WebGLRenderingContext* context)
{
return adoptPtr(new EXTDrawBuffers(context));
}
// static
bool EXTDrawBuffers::supported(WebGLRenderingContext* context)
{
#if OS(DARWIN)
// https://bugs.webkit.org/show_bug.cgi?id=112486
return false;
#endif
Extensions3D* extensions = context->graphicsContext3D()->getExtensions();
return (extensions->supports("GL_EXT_draw_buffers")
&& satisfiesWebGLRequirements(context));
}
void EXTDrawBuffers::drawBuffersEXT(const Vector<GC3Denum>& buffers)
{
if (m_context->isContextLost())
return;
GC3Dsizei n = buffers.size();
const GC3Denum* bufs = buffers.data();
if (!m_context->m_framebufferBinding) {
if (n != 1) {
m_context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "drawBuffersEXT", "more than one buffer");
return;
}
if (bufs[0] != GraphicsContext3D::BACK && bufs[0] != GraphicsContext3D::NONE) {
m_context->synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "drawBuffersEXT", "BACK or NONE");
return;
}
// Because the backbuffer is simulated on all current WebKit ports, we need to change BACK to COLOR_ATTACHMENT0.
GC3Denum value = (bufs[0] == GraphicsContext3D::BACK) ? GraphicsContext3D::COLOR_ATTACHMENT0 : GraphicsContext3D::NONE;
m_context->graphicsContext3D()->getExtensions()->drawBuffersEXT(1, &value);
m_context->setBackDrawBuffer(bufs[0]);
} else {
if (n > m_context->getMaxDrawBuffers()) {
m_context->synthesizeGLError(GraphicsContext3D::INVALID_VALUE, "drawBuffersEXT", "more than max draw buffers");
return;
}
for (GC3Dsizei i = 0; i < n; ++i) {
if (bufs[i] != GraphicsContext3D::NONE && bufs[i] != static_cast<GC3Denum>(Extensions3D::COLOR_ATTACHMENT0_EXT + i)) {
m_context->synthesizeGLError(GraphicsContext3D::INVALID_OPERATION, "drawBuffersEXT", "COLOR_ATTACHMENTi_EXT or NONE");
return;
}
}
m_context->m_framebufferBinding->drawBuffers(buffers);
}
}
// static
bool EXTDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContext* webglContext)
{
GraphicsContext3D* context = webglContext->graphicsContext3D();
// This is called after we make sure GL_EXT_draw_buffers is supported.
GC3Dint maxDrawBuffers = 0;
GC3Dint maxColorAttachments = 0;
context->getIntegerv(Extensions3D::MAX_DRAW_BUFFERS_EXT, &maxDrawBuffers);
context->getIntegerv(Extensions3D::MAX_COLOR_ATTACHMENTS_EXT, &maxColorAttachments);
if (maxDrawBuffers < 4 || maxColorAttachments < 4)
return false;
Platform3DObject fbo = context->createFramebuffer();
context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, fbo);
const unsigned char buffer[4] = { 0, 0, 0, 0 }; // textures are required to be initialized for other ports.
bool supportsDepth = (context->getExtensions()->supports("GL_CHROMIUM_depth_texture")
|| context->getExtensions()->supports("GL_OES_depth_texture")
|| context->getExtensions()->supports("GL_ARB_depth_texture"));
bool supportsDepthStencil = (context->getExtensions()->supports("GL_EXT_packed_depth_stencil")
|| context->getExtensions()->supports("GL_OES_packed_depth_stencil"));
Platform3DObject depthStencil = 0;
if (supportsDepthStencil) {
depthStencil = context->createTexture();
context->bindTexture(GraphicsContext3D::TEXTURE_2D, depthStencil);
context->texImage2D(GraphicsContext3D::TEXTURE_2D, 0, GraphicsContext3D::DEPTH_STENCIL, 1, 1, 0, GraphicsContext3D::DEPTH_STENCIL, GraphicsContext3D::UNSIGNED_INT_24_8, buffer);
}
Platform3DObject depth = 0;
if (supportsDepth) {
depth = context->createTexture();
context->bindTexture(GraphicsContext3D::TEXTURE_2D, depth);
context->texImage2D(GraphicsContext3D::TEXTURE_2D, 0, GraphicsContext3D::DEPTH_COMPONENT, 1, 1, 0, GraphicsContext3D::DEPTH_COMPONENT, GraphicsContext3D::UNSIGNED_INT, buffer);
}
Vector<Platform3DObject> colors;
bool ok = true;
GC3Dint maxAllowedBuffers = std::min(maxDrawBuffers, maxColorAttachments);
for (GC3Dint i = 0; i < maxAllowedBuffers; ++i) {
Platform3DObject color = context->createTexture();
colors.append(color);
context->bindTexture(GraphicsContext3D::TEXTURE_2D, color);
context->texImage2D(GraphicsContext3D::TEXTURE_2D, 0, GraphicsContext3D::RGBA, 1, 1, 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE, buffer);
context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0 + i, GraphicsContext3D::TEXTURE_2D, color, 0);
if (context->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) != GraphicsContext3D::FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
if (supportsDepth) {
context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::DEPTH_ATTACHMENT, GraphicsContext3D::TEXTURE_2D, depth, 0);
if (context->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) != GraphicsContext3D::FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::DEPTH_ATTACHMENT, GraphicsContext3D::TEXTURE_2D, 0, 0);
}
if (supportsDepthStencil) {
context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::DEPTH_ATTACHMENT, GraphicsContext3D::TEXTURE_2D, depthStencil, 0);
context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::STENCIL_ATTACHMENT, GraphicsContext3D::TEXTURE_2D, depthStencil, 0);
if (context->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) != GraphicsContext3D::FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::DEPTH_ATTACHMENT, GraphicsContext3D::TEXTURE_2D, 0, 0);
context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::STENCIL_ATTACHMENT, GraphicsContext3D::TEXTURE_2D, 0, 0);
}
}
webglContext->restoreCurrentFramebuffer();
context->deleteFramebuffer(fbo);
webglContext->restoreCurrentTexture2D();
if (supportsDepth)
context->deleteTexture(depth);
if (supportsDepthStencil)
context->deleteTexture(depthStencil);
for (size_t i = 0; i < colors.size(); ++i)
context->deleteTexture(colors[i]);
return ok;
}
} // namespace WebCore
#endif // ENABLE(WEBGL)
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