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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 "third_party/blink/renderer/modules/webgl/webgl_draw_buffers.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/blink/renderer/modules/webgl/webgl_framebuffer.h"
#include "third_party/blink/renderer/modules/webgl/webgl_rendering_context_base.h"
namespace blink {
WebGLDrawBuffers::WebGLDrawBuffers(WebGLRenderingContextBase* context)
: WebGLExtension(context) {
context->ExtensionsUtil()->EnsureExtensionEnabled("GL_EXT_draw_buffers");
}
WebGLExtensionName WebGLDrawBuffers::GetName() const {
return kWebGLDrawBuffersName;
}
// static
bool WebGLDrawBuffers::Supported(WebGLRenderingContextBase* context) {
return context->ExtensionsUtil()->SupportsExtension("GL_EXT_draw_buffers");
}
// static
const char* WebGLDrawBuffers::ExtensionName() {
return "WEBGL_draw_buffers";
}
void WebGLDrawBuffers::drawBuffersWEBGL(const Vector<GLenum>& buffers) {
WebGLExtensionScopedContext scoped(this);
if (scoped.IsLost())
return;
const GLsizei buffer_count = buffers.size();
if (!scoped.Context()->framebuffer_binding_) {
if (buffer_count != 1) {
scoped.Context()->SynthesizeGLError(GL_INVALID_OPERATION,
"drawBuffersWEBGL",
"must provide exactly one buffer");
return;
}
GLenum buffer = buffers.front();
if (buffer != GL_BACK && buffer != 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 = buffer == GL_BACK ? GL_COLOR_ATTACHMENT0 : GL_NONE;
scoped.Context()->ContextGL()->DrawBuffersEXT(1, &value);
scoped.Context()->SetBackDrawBuffer(buffer);
} else {
if (buffer_count > scoped.Context()->MaxDrawBuffers()) {
scoped.Context()->SynthesizeGLError(GL_INVALID_VALUE, "drawBuffersWEBGL",
"more than max draw buffers");
return;
}
GLsizei index = 0;
for (const GLenum& buffer : buffers) {
if (buffer != GL_NONE &&
buffer != static_cast<GLenum>(GL_COLOR_ATTACHMENT0_EXT + index)) {
scoped.Context()->SynthesizeGLError(GL_INVALID_OPERATION,
"drawBuffersWEBGL",
"COLOR_ATTACHMENTi_EXT or NONE");
return;
}
++index;
}
scoped.Context()->framebuffer_binding_->DrawBuffers(buffers);
}
}
} // namespace blink
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