dom/canvas/WebGLExtensionSRGB.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 #include "WebGLFormats.h"
  12
  13 namespace mozilla {
  14
  15 WebGLExtensionSRGB::WebGLExtensionSRGB(WebGLContext* webgl)
  16     : WebGLExtensionBase(webgl) {
  17   MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
  18
  19   gl::GLContext* gl = webgl->GL();
  20   if (!gl->IsGLES()) {
  21     // Desktop OpenGL requires the following to be enabled in order to
  22     // support sRGB operations on framebuffers.
  23     gl->fEnable(LOCAL_GL_FRAMEBUFFER_SRGB_EXT);
  24   }
  25
  26   auto& fua = webgl->mFormatUsage;
  27
  28   RefPtr<gl::GLContext> gl_ = gl;  // Bug 1201275
  29   const auto fnAdd = [&fua, &gl_](webgl::EffectiveFormat effFormat,
  30                                   GLenum format, GLenum desktopUnpackFormat) {
  31     auto usage = fua->EditUsage(effFormat);
  32     usage->isFilterable = true;
  33
  34     webgl::DriverUnpackInfo dui = {format, format, LOCAL_GL_UNSIGNED_BYTE};
  35     const auto pi = dui.ToPacking();
  36
  37     if (!gl_->IsGLES()) dui.unpackFormat = desktopUnpackFormat;
  38
  39     fua->AddTexUnpack(usage, pi, dui);
  40
  41     fua->AllowUnsizedTexFormat(pi, usage);
  42   };
  43
  44   fnAdd(webgl::EffectiveFormat::SRGB8, LOCAL_GL_SRGB, LOCAL_GL_RGB);
  45   fnAdd(webgl::EffectiveFormat::SRGB8_ALPHA8, LOCAL_GL_SRGB_ALPHA,
  46         LOCAL_GL_RGBA);
  47
  48   auto usage = fua->EditUsage(webgl::EffectiveFormat::SRGB8_ALPHA8);
  49   usage->SetRenderable();
  50   fua->AllowRBFormat(LOCAL_GL_SRGB8_ALPHA8, usage);
  51 }
  52
  53 bool WebGLExtensionSRGB::IsSupported(const WebGLContext* const webgl) {
  54   if (webgl->IsWebGL2()) return false;
  55
  56   return webgl->gl->IsSupported(gl::GLFeature::sRGB);
  57 }
  58
  59 }  // namespace mozilla