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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WebGLExtensions.h"
#include <algorithm>
#include "GLContext.h"
#include "mozilla/dom/WebGLRenderingContextBinding.h"
#include "WebGLContext.h"
#include "WebGLFramebuffer.h"
#include "WebGLRenderbuffer.h"
#include "WebGLTexture.h"
namespace mozilla {
WebGLExtensionDrawBuffers::WebGLExtensionDrawBuffers(WebGLContext* webgl)
: WebGLExtensionBase(webgl)
{
MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
// WEBGL_draw_buffers:
// "The value of the MAX_COLOR_ATTACHMENTS_WEBGL parameter must be greater than or
// equal to that of the MAX_DRAW_BUFFERS_WEBGL parameter."
webgl->mImplMaxColorAttachments = webgl->mGLMaxColorAttachments;
webgl->mImplMaxDrawBuffers = std::min(webgl->mGLMaxDrawBuffers,
webgl->mImplMaxColorAttachments);
}
WebGLExtensionDrawBuffers::~WebGLExtensionDrawBuffers()
{
}
void
WebGLExtensionDrawBuffers::DrawBuffersWEBGL(const dom::Sequence<GLenum>& buffers)
{
if (mIsLost) {
mContext->ErrorInvalidOperation("drawBuffersWEBGL: Extension is lost.");
return;
}
mContext->DrawBuffers(buffers);
}
bool
WebGLExtensionDrawBuffers::IsSupported(const WebGLContext* webgl)
{
gl::GLContext* gl = webgl->GL();
if (!gl->IsExtensionSupported(gl::GLContext::ARB_draw_buffers) &&
!gl->IsExtensionSupported(gl::GLContext::EXT_draw_buffers))
{
return false;
}
// WEBGL_draw_buffers requires at least 4 color attachments.
if (webgl->mGLMaxDrawBuffers < webgl->kMinMaxDrawBuffers ||
webgl->mGLMaxColorAttachments < webgl->kMinMaxColorAttachments)
{
return false;
}
return true;
}
IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionDrawBuffers, WEBGL_draw_buffers)
} // namespace mozilla
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