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