dom/canvas/WebGLExtensionFragDepth.cpp

   1 /* -*- Mode: C++; tab-width: 20; 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
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "WebGLExtensions.h"
   7
   8 #include "GLContext.h"
   9 #include "mozilla/dom/WebGLRenderingContextBinding.h"
  10 #include "WebGLContext.h"
  11
  12 namespace mozilla {
  13
  14 WebGLExtensionFragDepth::WebGLExtensionFragDepth(WebGLContext* webgl)
  15     : WebGLExtensionBase(webgl) {
  16   MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
  17 }
  18
  19 bool WebGLExtensionFragDepth::IsSupported(const WebGLContext* webgl) {
  20   if (webgl->IsWebGL2()) return false;
  21
  22   gl::GLContext* gl = webgl->GL();
  23   if (gl->IsGLES() && gl->Version() >= 300) {
  24     // ANGLE's shader translator can't translate ESSL1 exts to ESSL3. (bug
  25     // 1524804)
  26     return false;
  27   }
  28   return gl->IsSupported(gl::GLFeature::frag_depth);
  29 }
  30
  31 }  // namespace mozilla