/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* 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 {

WebGLExtensionSRGB::WebGLExtensionSRGB(WebGLContext* webgl)

    : WebGLExtensionBase(webgl)

{

    MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");

    gl::GLContext* gl = webgl->GL();

    if (!gl->IsGLES()) {

        // Desktop OpenGL requires the following to be enabled in order to

        // support sRGB operations on framebuffers.

        gl->fEnable(LOCAL_GL_FRAMEBUFFER_SRGB_EXT);

    }

    auto& fua = webgl->mFormatUsage;

    RefPtr<gl::GLContext> gl_ = gl; // Bug 1201275

    const auto fnAdd = [&fua, &gl_](webgl::EffectiveFormat effFormat, GLenum format,

                                    GLenum desktopUnpackFormat)

    {

        auto usage = fua->EditUsage(effFormat);

        usage->isFilterable = true;

        webgl::DriverUnpackInfo dui = {format, format, LOCAL_GL_UNSIGNED_BYTE};

        const auto pi = dui.ToPacking();

        if (!gl_->IsGLES())

            dui.unpackFormat = desktopUnpackFormat;

        fua->AddTexUnpack(usage, pi, dui);

        fua->AllowUnsizedTexFormat(pi, usage);

    };

    fnAdd(webgl::EffectiveFormat::SRGB8, LOCAL_GL_SRGB, LOCAL_GL_RGB);

    fnAdd(webgl::EffectiveFormat::SRGB8_ALPHA8, LOCAL_GL_SRGB_ALPHA, LOCAL_GL_RGBA);

    auto usage = fua->EditUsage(webgl::EffectiveFormat::SRGB8_ALPHA8);

    usage->SetRenderable();

    fua->AllowRBFormat(LOCAL_GL_SRGB8_ALPHA8, usage);

}

WebGLExtensionSRGB::~WebGLExtensionSRGB()

{

}

bool

WebGLExtensionSRGB::IsSupported(const WebGLContext* const webgl)

{

    return webgl->gl->IsSupported(gl::GLFeature::sRGB);

}

IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionSRGB, EXT_sRGB)

} // namespace mozilla