WebGLExtensionCompressedTextureS3TC_SRGB.cpp

/* 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_SRGB::
    WebGLExtensionCompressedTextureS3TC_SRGB(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);
  };

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

  fnAdd(FOO(COMPRESSED_SRGB_S3TC_DXT1_EXT));
  fnAdd(FOO(COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT));
  fnAdd(FOO(COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT));
  fnAdd(FOO(COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT));

#undef FOO
}

bool WebGLExtensionCompressedTextureS3TC_SRGB::IsSupported(
    const WebGLContext* webgl) {
  gl::GLContext* gl = webgl->GL();
  if (gl->IsGLES())
    return gl->IsExtensionSupported(
        gl::GLContext::EXT_texture_compression_s3tc_srgb);

  // Desktop GL is more complicated: It's EXT_texture_sRGB, when
  // EXT_texture_compression_s3tc is supported, that enables srgb+s3tc.
  return gl->IsExtensionSupported(gl::GLContext::EXT_texture_sRGB) &&
         gl->IsExtensionSupported(gl::GLContext::EXT_texture_compression_s3tc);
}

}  // namespace mozilla