michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "WebGLContext.h"
michael@0: #include "WebGLExtensions.h"
michael@0: #include "mozilla/dom/WebGLRenderingContextBinding.h"
michael@0: #include "WebGLTexture.h"
michael@0: #include "WebGLRenderbuffer.h"
michael@0: #include "WebGLFramebuffer.h"
michael@0: #include "GLContext.h"
michael@0: 
michael@0: #include <algorithm>
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace gl;
michael@0: 
michael@0: WebGLExtensionDrawBuffers::WebGLExtensionDrawBuffers(WebGLContext* context)
michael@0:     : WebGLExtensionBase(context)
michael@0: {
michael@0:     GLint maxColorAttachments = 0;
michael@0:     GLint maxDrawBuffers = 0;
michael@0: 
michael@0:     gl::GLContext* gl = context->GL();
michael@0: 
michael@0:     context->MakeContextCurrent();
michael@0: 
michael@0:     gl->fGetIntegerv(LOCAL_GL_MAX_COLOR_ATTACHMENTS, &maxColorAttachments);
michael@0:     gl->fGetIntegerv(LOCAL_GL_MAX_DRAW_BUFFERS, &maxDrawBuffers);
michael@0: 
michael@0:     // WEBGL_draw_buffers specifications don't give a maximal value reachable by MAX_COLOR_ATTACHMENTS.
michael@0:     maxColorAttachments = std::min(maxColorAttachments, GLint(WebGLContext::sMaxColorAttachments));
michael@0: 
michael@0:     if (context->MinCapabilityMode())
michael@0:     {
michael@0:         maxColorAttachments = std::min(maxColorAttachments, GLint(sMinColorAttachments));
michael@0:     }
michael@0: 
michael@0:     // WEBGL_draw_buffers specifications request MAX_COLOR_ATTACHMENTS >= MAX_DRAW_BUFFERS.
michael@0:     maxDrawBuffers = std::min(maxDrawBuffers, GLint(maxColorAttachments));
michael@0: 
michael@0:     context->mGLMaxColorAttachments = maxColorAttachments;
michael@0:     context->mGLMaxDrawBuffers = maxDrawBuffers;
michael@0: }
michael@0: 
michael@0: WebGLExtensionDrawBuffers::~WebGLExtensionDrawBuffers()
michael@0: {
michael@0: }
michael@0: 
michael@0: void WebGLExtensionDrawBuffers::DrawBuffersWEBGL(const dom::Sequence<GLenum>& buffers)
michael@0: {
michael@0:     if (mIsLost)
michael@0:         return mContext->ErrorInvalidOperation("drawBuffersWEBGL: Extension is lost.");
michael@0: 
michael@0:     mContext->DrawBuffers(buffers);
michael@0: }
michael@0: 
michael@0: bool WebGLExtensionDrawBuffers::IsSupported(const WebGLContext* context)
michael@0: {
michael@0:     gl::GLContext * gl = context->GL();
michael@0: 
michael@0:     if (!gl->IsSupported(GLFeature::draw_buffers)) {
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     GLint supportedColorAttachments = 0;
michael@0:     GLint supportedDrawBuffers = 0;
michael@0: 
michael@0:     context->MakeContextCurrent();
michael@0: 
michael@0:     gl->fGetIntegerv(LOCAL_GL_MAX_COLOR_ATTACHMENTS, &supportedColorAttachments);
michael@0:     gl->fGetIntegerv(LOCAL_GL_MAX_COLOR_ATTACHMENTS, &supportedDrawBuffers);
michael@0: 
michael@0:     if (size_t(supportedColorAttachments) < sMinColorAttachments){
michael@0:         // WEBGL_draw_buffers specifications request for 4 color attachments at least.
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     if (size_t(supportedDrawBuffers) < sMinDrawBuffers){
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionDrawBuffers)