| /* |
| * 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" |
| |
| namespace blink { |
| |
| WebGLDrawBuffers::WebGLDrawBuffers(WebGLRenderingContextBase* context) |
| : WebGLExtension(context) { |
| context->ExtensionsUtil()->EnsureExtensionEnabled("GL_EXT_draw_buffers"); |
| } |
| |
| WebGLExtensionName WebGLDrawBuffers::GetName() const { |
| return kWebGLDrawBuffersName; |
| } |
| |
| WebGLDrawBuffers* WebGLDrawBuffers::Create(WebGLRenderingContextBase* context) { |
| return MakeGarbageCollected<WebGLDrawBuffers>(context); |
| } |
| |
| // 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; |
| GLsizei n = buffers.size(); |
| const GLenum* bufs = buffers.data(); |
| if (!scoped.Context()->framebuffer_binding_) { |
| if (n != 1) { |
| scoped.Context()->SynthesizeGLError(GL_INVALID_OPERATION, |
| "drawBuffersWEBGL", |
| "must provide exactly one buffer"); |
| return; |
| } |
| if (bufs[0] != GL_BACK && bufs[0] != 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 = (bufs[0] == GL_BACK) ? GL_COLOR_ATTACHMENT0 : GL_NONE; |
| scoped.Context()->ContextGL()->DrawBuffersEXT(1, &value); |
| scoped.Context()->SetBackDrawBuffer(bufs[0]); |
| } else { |
| if (n > scoped.Context()->MaxDrawBuffers()) { |
| scoped.Context()->SynthesizeGLError(GL_INVALID_VALUE, "drawBuffersWEBGL", |
| "more than max draw buffers"); |
| return; |
| } |
| for (GLsizei i = 0; i < n; ++i) { |
| if (bufs[i] != GL_NONE && |
| bufs[i] != static_cast<GLenum>(GL_COLOR_ATTACHMENT0_EXT + i)) { |
| scoped.Context()->SynthesizeGLError(GL_INVALID_OPERATION, |
| "drawBuffersWEBGL", |
| "COLOR_ATTACHMENTi_EXT or NONE"); |
| return; |
| } |
| } |
| scoped.Context()->framebuffer_binding_->DrawBuffers(buffers); |
| } |
| } |
| |
| } // namespace blink |