/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WebGLExtensions.h"

#include "GLContext.h"
#include "mozilla/dom/WebGLRenderingContextBinding.h"
#include "WebGLContext.h"
#include "WebGLFormats.h"

namespace mozilla {

WebGLExtensionColorBufferHalfFloat::WebGLExtensionColorBufferHalfFloat(
    WebGLContext* webgl)
    : WebGLExtensionBase(webgl) {
  MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
  SetRenderable(webgl::FormatRenderableState::Implicit(
      WebGLExtensionID::EXT_color_buffer_half_float));
}

void WebGLExtensionColorBufferHalfFloat::SetRenderable(
    const webgl::FormatRenderableState state) {
  auto& fua = mContext->mFormatUsage;

  auto fnUpdateUsage = [&](GLenum sizedFormat, webgl::EffectiveFormat effFormat,
                           const bool renderable) {
    auto usage = fua->EditUsage(effFormat);
    if (renderable) {
      usage->SetRenderable(state);
    }
    fua->AllowRBFormat(sizedFormat, usage, renderable);
  };

#define FOO(x, y) fnUpdateUsage(LOCAL_GL_##x, webgl::EffectiveFormat::x, y)

  FOO(RGBA16F, true);
  FOO(RGB16F, false);  // It's not required, thus not portable. (Also there's a
                       // wicked driver bug on Mac+Intel)

#undef FOO
}

void WebGLExtensionColorBufferHalfFloat::OnSetExplicit() {
  SetRenderable(webgl::FormatRenderableState::Explicit());
}

bool WebGLExtensionColorBufferHalfFloat::IsSupported(
    const WebGLContext* webgl) {
  if (webgl->IsWebGL2()) return false;

  const auto& gl = webgl->gl;
  return gl->IsSupported(gl::GLFeature::renderbuffer_color_half_float) &&
         gl->IsSupported(gl::GLFeature::frag_color_float);
}

}  // namespace mozilla