dom/canvas/WebGLExtensionShaderTextureLod.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 WebGLExtensionShaderTextureLod::WebGLExtensionShaderTextureLod(
  15     WebGLContext* webgl)
  16     : WebGLExtensionBase(webgl) {
  17   MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
  18 }
  19
  20 bool WebGLExtensionShaderTextureLod::IsSupported(const WebGLContext* webgl) {
  21   if (webgl->IsWebGL2()) return false;
  22
  23   gl::GLContext* gl = webgl->GL();
  24   if (gl->IsGLES() && gl->Version() >= 300) {
  25     // ANGLE's shader translator doesn't yet translate
  26     // WebGL1+EXT_shader_texture_lod to ES3. (Bug 1491221)
  27     return false;
  28   }
  29   return gl->IsSupported(gl::GLFeature::shader_texture_lod);
  30 }
  31
  32 }  // namespace mozilla