1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/canvas/src/WebGLExtensionDrawBuffers.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,87 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.7 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "WebGLContext.h"
1.10 +#include "WebGLExtensions.h"
1.11 +#include "mozilla/dom/WebGLRenderingContextBinding.h"
1.12 +#include "WebGLTexture.h"
1.13 +#include "WebGLRenderbuffer.h"
1.14 +#include "WebGLFramebuffer.h"
1.15 +#include "GLContext.h"
1.16 +
1.17 +#include <algorithm>
1.18 +
1.19 +using namespace mozilla;
1.20 +using namespace gl;
1.21 +
1.22 +WebGLExtensionDrawBuffers::WebGLExtensionDrawBuffers(WebGLContext* context)
1.23 + : WebGLExtensionBase(context)
1.24 +{
1.25 + GLint maxColorAttachments = 0;
1.26 + GLint maxDrawBuffers = 0;
1.27 +
1.28 + gl::GLContext* gl = context->GL();
1.29 +
1.30 + context->MakeContextCurrent();
1.31 +
1.32 + gl->fGetIntegerv(LOCAL_GL_MAX_COLOR_ATTACHMENTS, &maxColorAttachments);
1.33 + gl->fGetIntegerv(LOCAL_GL_MAX_DRAW_BUFFERS, &maxDrawBuffers);
1.34 +
1.35 + // WEBGL_draw_buffers specifications don't give a maximal value reachable by MAX_COLOR_ATTACHMENTS.
1.36 + maxColorAttachments = std::min(maxColorAttachments, GLint(WebGLContext::sMaxColorAttachments));
1.37 +
1.38 + if (context->MinCapabilityMode())
1.39 + {
1.40 + maxColorAttachments = std::min(maxColorAttachments, GLint(sMinColorAttachments));
1.41 + }
1.42 +
1.43 + // WEBGL_draw_buffers specifications request MAX_COLOR_ATTACHMENTS >= MAX_DRAW_BUFFERS.
1.44 + maxDrawBuffers = std::min(maxDrawBuffers, GLint(maxColorAttachments));
1.45 +
1.46 + context->mGLMaxColorAttachments = maxColorAttachments;
1.47 + context->mGLMaxDrawBuffers = maxDrawBuffers;
1.48 +}
1.49 +
1.50 +WebGLExtensionDrawBuffers::~WebGLExtensionDrawBuffers()
1.51 +{
1.52 +}
1.53 +
1.54 +void WebGLExtensionDrawBuffers::DrawBuffersWEBGL(const dom::Sequence<GLenum>& buffers)
1.55 +{
1.56 + if (mIsLost)
1.57 + return mContext->ErrorInvalidOperation("drawBuffersWEBGL: Extension is lost.");
1.58 +
1.59 + mContext->DrawBuffers(buffers);
1.60 +}
1.61 +
1.62 +bool WebGLExtensionDrawBuffers::IsSupported(const WebGLContext* context)
1.63 +{
1.64 + gl::GLContext * gl = context->GL();
1.65 +
1.66 + if (!gl->IsSupported(GLFeature::draw_buffers)) {
1.67 + return false;
1.68 + }
1.69 +
1.70 + GLint supportedColorAttachments = 0;
1.71 + GLint supportedDrawBuffers = 0;
1.72 +
1.73 + context->MakeContextCurrent();
1.74 +
1.75 + gl->fGetIntegerv(LOCAL_GL_MAX_COLOR_ATTACHMENTS, &supportedColorAttachments);
1.76 + gl->fGetIntegerv(LOCAL_GL_MAX_COLOR_ATTACHMENTS, &supportedDrawBuffers);
1.77 +
1.78 + if (size_t(supportedColorAttachments) < sMinColorAttachments){
1.79 + // WEBGL_draw_buffers specifications request for 4 color attachments at least.
1.80 + return false;
1.81 + }
1.82 +
1.83 + if (size_t(supportedDrawBuffers) < sMinDrawBuffers){
1.84 + return false;
1.85 + }
1.86 +
1.87 + return true;
1.88 +}
1.89 +
1.90 +IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionDrawBuffers)
