dom/canvas/WebGLExtensionColorBufferHalfFloat.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "WebGLExtensions.h"
   6
   7 #include "GLContext.h"
   8 #include "mozilla/dom/WebGLRenderingContextBinding.h"
   9 #include "WebGLContext.h"
  10 #include "WebGLFormats.h"
  11
  12 namespace mozilla {
  13
  14 WebGLExtensionColorBufferHalfFloat::WebGLExtensionColorBufferHalfFloat(
  15     WebGLContext* webgl)
  16     : WebGLExtensionBase(webgl) {
  17   MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
  18   SetRenderable(webgl::FormatRenderableState::Implicit(
  19       WebGLExtensionID::EXT_color_buffer_half_float));
  20 }
  21
  22 void WebGLExtensionColorBufferHalfFloat::SetRenderable(
  23     const webgl::FormatRenderableState state) {
  24   auto& fua = mContext->mFormatUsage;
  25
  26   auto fnUpdateUsage = [&](GLenum sizedFormat, webgl::EffectiveFormat effFormat,
  27                            const bool renderable) {
  28     auto usage = fua->EditUsage(effFormat);
  29     if (renderable) {
  30       usage->SetRenderable(state);
  31     }
  32     fua->AllowRBFormat(sizedFormat, usage, renderable);
  33   };
  34
  35 #define FOO(x, y) fnUpdateUsage(LOCAL_GL_##x, webgl::EffectiveFormat::x, y)
  36
  37   FOO(RGBA16F, true);
  38   FOO(RGB16F, false);  // It's not required, thus not portable. (Also there's a
  39                        // wicked driver bug on Mac+Intel)
  40
  41 #undef FOO
  42 }
  43
  44 void WebGLExtensionColorBufferHalfFloat::OnSetExplicit() {
  45   SetRenderable(webgl::FormatRenderableState::Explicit());
  46 }
  47
  48 bool WebGLExtensionColorBufferHalfFloat::IsSupported(
  49     const WebGLContext* webgl) {
  50   if (webgl->IsWebGL2()) return false;
  51
  52   const auto& gl = webgl->gl;
  53   return gl->IsSupported(gl::GLFeature::renderbuffer_color_half_float) &&
  54          gl->IsSupported(gl::GLFeature::frag_color_float);
  55 }
  56
  57 }  // namespace mozilla