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/* 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 {

WebGLExtensionCompressedTextureS3TC::WebGLExtensionCompressedTextureS3TC(
    WebGLContext* webgl)
    : WebGLExtensionBase(webgl) {
  RefPtr<WebGLContext> webgl_ = webgl;  // Bug 1201275
  const auto fnAdd = [&webgl_](GLenum sizedFormat,
                               webgl::EffectiveFormat effFormat) {
    auto& fua = webgl_->mFormatUsage;

    auto usage = fua->EditUsage(effFormat);
    usage->isFilterable = true;
    fua->AllowSizedTexFormat(sizedFormat, usage);

    webgl_->mCompressedTextureFormats.AppendElement(sizedFormat);
  };

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

  fnAdd(FOO(COMPRESSED_RGB_S3TC_DXT1_EXT));
  fnAdd(FOO(COMPRESSED_RGBA_S3TC_DXT1_EXT));
  fnAdd(FOO(COMPRESSED_RGBA_S3TC_DXT3_EXT));
  fnAdd(FOO(COMPRESSED_RGBA_S3TC_DXT5_EXT));

#undef FOO
}

WebGLExtensionCompressedTextureS3TC::~WebGLExtensionCompressedTextureS3TC() {}

bool WebGLExtensionCompressedTextureS3TC::IsSupported(
    const WebGLContext* webgl) {
  gl::GLContext* gl = webgl->GL();
  if (gl->IsExtensionSupported(gl::GLContext::EXT_texture_compression_s3tc))
    return true;

  return gl->IsExtensionSupported(
             gl::GLContext::EXT_texture_compression_dxt1) &&
         gl->IsExtensionSupported(
             gl::GLContext::ANGLE_texture_compression_dxt3) &&
         gl->IsExtensionSupported(
             gl::GLContext::ANGLE_texture_compression_dxt5);
}

IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionCompressedTextureS3TC,
                          WEBGL_compressed_texture_s3tc)

}  // namespace mozilla