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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 "modules/webgl/WebGLDrawBuffers.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "modules/webgl/WebGLFramebuffer.h"
namespace blink {
WebGLDrawBuffers::WebGLDrawBuffers(WebGLRenderingContextBase* context)
: WebGLExtension(context)
{
context->extensionsUtil()->ensureExtensionEnabled("GL_EXT_draw_buffers");
}
WebGLDrawBuffers::~WebGLDrawBuffers()
{
}
WebGLExtensionName WebGLDrawBuffers::name() const
{
return WebGLDrawBuffersName;
}
WebGLDrawBuffers* WebGLDrawBuffers::create(WebGLRenderingContextBase* context)
{
return new WebGLDrawBuffers(context);
}
// static
bool WebGLDrawBuffers::supported(WebGLRenderingContextBase* context)
{
return (context->extensionsUtil()->supportsExtension("GL_EXT_draw_buffers")
&& satisfiesWebGLRequirements(context));
}
// static
const char* WebGLDrawBuffers::extensionName()
{
return "WEBGL_draw_buffers";
}
void WebGLDrawBuffers::drawBuffersWEBGL(const Vector<GLenum>& buffers)
{
WebGLExtensionScopedContext scoped(this);
if (scoped.isLost())
return;
GLsizei n = buffers.size();
const GLenum* bufs = buffers.data();
if (!scoped.context()->m_framebufferBinding) {
if (n != 1) {
scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "must provide exactly one buffer");
return;
}
if (bufs[0] != GL_BACK && bufs[0] != GL_NONE) {
scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "BACK or NONE");
return;
}
// Because the backbuffer is simulated on all current WebKit ports, we need to change BACK to COLOR_ATTACHMENT0.
GLenum value = (bufs[0] == GL_BACK) ? GL_COLOR_ATTACHMENT0 : GL_NONE;
scoped.context()->webContext()->drawBuffersEXT(1, &value);
scoped.context()->setBackDrawBuffer(bufs[0]);
} else {
if (n > scoped.context()->maxDrawBuffers()) {
scoped.context()->synthesizeGLError(GL_INVALID_VALUE, "drawBuffersWEBGL", "more than max draw buffers");
return;
}
for (GLsizei i = 0; i < n; ++i) {
if (bufs[i] != GL_NONE && bufs[i] != static_cast<GLenum>(GL_COLOR_ATTACHMENT0_EXT + i)) {
scoped.context()->synthesizeGLError(GL_INVALID_OPERATION, "drawBuffersWEBGL", "COLOR_ATTACHMENTi_EXT or NONE");
return;
}
}
scoped.context()->m_framebufferBinding->drawBuffers(buffers);
}
}
// static
bool WebGLDrawBuffers::satisfiesWebGLRequirements(WebGLRenderingContextBase* webglContext)
{
WebGraphicsContext3D* context = webglContext->webContext();
gpu::gles2::GLES2Interface* gl = webglContext->contextGL();
Extensions3DUtil* extensionsUtil = webglContext->extensionsUtil();
// This is called after we make sure GL_EXT_draw_buffers is supported.
GLint maxDrawBuffers = 0;
GLint maxColorAttachments = 0;
context->getIntegerv(GL_MAX_DRAW_BUFFERS_EXT, &maxDrawBuffers);
context->getIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &maxColorAttachments);
if (maxDrawBuffers < 4 || maxColorAttachments < 4)
return false;
Platform3DObject fbo = context->createFramebuffer();
gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
const unsigned char* buffer = 0; // Chromium doesn't allow init data for depth/stencil tetxures.
bool supportsDepth = (extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
|| extensionsUtil->supportsExtension("GL_OES_depth_texture")
|| extensionsUtil->supportsExtension("GL_ARB_depth_texture"));
bool supportsDepthStencil = (extensionsUtil->supportsExtension("GL_EXT_packed_depth_stencil")
|| extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"));
Platform3DObject depthStencil = 0;
if (supportsDepthStencil) {
depthStencil = context->createTexture();
gl->BindTexture(GL_TEXTURE_2D, depthStencil);
context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_STENCIL_OES, 1, 1, 0, GL_DEPTH_STENCIL_OES, GL_UNSIGNED_INT_24_8_OES, buffer);
}
Platform3DObject depth = 0;
if (supportsDepth) {
depth = context->createTexture();
gl->BindTexture(GL_TEXTURE_2D, depth);
context->texImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 1, 1, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buffer);
}
Vector<Platform3DObject> colors;
bool ok = true;
GLint maxAllowedBuffers = std::min(maxDrawBuffers, maxColorAttachments);
for (GLint i = 0; i < maxAllowedBuffers; ++i) {
Platform3DObject color = context->createTexture();
colors.append(color);
gl->BindTexture(GL_TEXTURE_2D, color);
context->texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, color, 0);
if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
if (supportsDepth) {
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth, 0);
if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
}
if (supportsDepthStencil) {
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_TEXTURE_2D, depthStencil, 0);
if (gl->CheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
ok = false;
break;
}
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_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 blink
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