dom/canvas/WebGLExtensionDrawBuffers.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   4  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "WebGLExtensions.h"
   7
   8 #include <algorithm>
   9 #include "GLContext.h"
  10 #include "mozilla/dom/WebGLRenderingContextBinding.h"
  11 #include "WebGLContext.h"
  12 #include "WebGLFramebuffer.h"
  13 #include "WebGLRenderbuffer.h"
  14 #include "WebGLTexture.h"
  15
  16 namespace mozilla {
  17
  18 WebGLExtensionDrawBuffers::WebGLExtensionDrawBuffers(WebGLContext* webgl)
  19     : WebGLExtensionBase(webgl) {
  20   MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
  21 }
  22
  23 bool WebGLExtensionDrawBuffers::IsSupported(const WebGLContext* webgl) {
  24   if (webgl->IsWebGL2()) return false;
  25
  26   gl::GLContext* gl = webgl->GL();
  27   if (gl->IsGLES() && gl->Version() >= 300) {
  28     // ANGLE's shader translator can't translate ESSL1 exts to ESSL3. (bug
  29     // 1524804)
  30     return false;
  31   }
  32   return gl->IsSupported(gl::GLFeature::draw_buffers);
  33 }
  34
  35 }  // namespace mozilla