dom/canvas/WebGLExtensionDepthTexture.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 WebGLExtensionDepthTexture::WebGLExtensionDepthTexture(
  15     WebGLContext* const webgl)
  16     : WebGLExtensionBase(webgl) {
  17   auto& fua = webgl->mFormatUsage;
  18
  19   const auto fnAdd = [&fua](webgl::EffectiveFormat effFormat,
  20                             GLenum unpackFormat, GLenum unpackType) {
  21     auto usage = fua->EditUsage(effFormat);
  22     MOZ_ASSERT(usage->isFilterable);
  23     MOZ_ASSERT(usage->IsRenderable());
  24
  25     const webgl::PackingInfo pi = {unpackFormat, unpackType};
  26     const webgl::DriverUnpackInfo dui = {unpackFormat, unpackFormat,
  27                                          unpackType};
  28     fua->AddTexUnpack(usage, pi, dui);
  29     fua->AllowUnsizedTexFormat(pi, usage);
  30   };
  31
  32   fnAdd(webgl::EffectiveFormat::DEPTH_COMPONENT16, LOCAL_GL_DEPTH_COMPONENT,
  33         LOCAL_GL_UNSIGNED_SHORT);
  34   fnAdd(webgl::EffectiveFormat::DEPTH_COMPONENT24, LOCAL_GL_DEPTH_COMPONENT,
  35         LOCAL_GL_UNSIGNED_INT);
  36   fnAdd(webgl::EffectiveFormat::DEPTH24_STENCIL8, LOCAL_GL_DEPTH_STENCIL,
  37         LOCAL_GL_UNSIGNED_INT_24_8);
  38 }
  39
  40 bool WebGLExtensionDepthTexture::IsSupported(const WebGLContext* const webgl) {
  41   if (webgl->IsWebGL2()) return false;
  42
  43   // WEBGL_depth_texture supports DEPTH_STENCIL textures
  44   const auto& gl = webgl->gl;
  45   if (!gl->IsSupported(gl::GLFeature::packed_depth_stencil)) return false;
  46
  47   return gl->IsSupported(gl::GLFeature::depth_texture) ||
  48          gl->IsExtensionSupported(gl::GLContext::ANGLE_depth_texture);
  49 }
  50
  51 }  // namespace mozilla