/* 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"

#ifdef FOO

#error FOO is already defined! We use FOO() macros to keep things succinct in this file.

#endif

namespace mozilla {

WebGLExtensionCompressedTextureES3::WebGLExtensionCompressedTextureES3(WebGLContext* webgl)

    : WebGLExtensionBase(webgl)

{

    // GLES 3.0.4, p147, table 3.19

    // GLES 3.0.4, p286+, $C.1 "ETC Compressed Texture Image Formats"

    // Note that all compressed texture formats are filterable:

    // GLES 3.0.4 p161:

    // "[A] texture is complete unless any of the following conditions hold true:

    //  [...]

    //  * The effective internal format specified for the texture arrays is a sized

    //    internal color format that is not texture-filterable (see table 3.13) and [the

    //    mag filter requires filtering]."

    // Compressed formats are not sized internal color formats, and indeed they are not

    // listed in table 3.13.

    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_R11_EAC));

    fnAdd(FOO(COMPRESSED_SIGNED_R11_EAC));

    fnAdd(FOO(COMPRESSED_RG11_EAC));

    fnAdd(FOO(COMPRESSED_SIGNED_RG11_EAC));

    fnAdd(FOO(COMPRESSED_RGB8_ETC2));

    fnAdd(FOO(COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2));

    fnAdd(FOO(COMPRESSED_RGBA8_ETC2_EAC));

    // sRGB support is manadatory in GL 4.3 and GL ES 3.0, which are the only

    // versions to support ETC2.

    fnAdd(FOO(COMPRESSED_SRGB8_ALPHA8_ETC2_EAC));

    fnAdd(FOO(COMPRESSED_SRGB8_ETC2));

    fnAdd(FOO(COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2));

#undef FOO

}

WebGLExtensionCompressedTextureES3::~WebGLExtensionCompressedTextureES3()

{

}

IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionCompressedTextureES3, WEBGL_compressed_texture_etc)

} // namespace mozilla