Source/WebCore/html/canvas/WebGLCompressedTextureS3TC.cpp

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#if ENABLE(WEBGL)

#include "WebGLCompressedTextureS3TC.h"

#include "ExtensionsGL.h"
#include "WebGLRenderingContextBase.h"

namespace WebCore {

WebGLCompressedTextureS3TC::WebGLCompressedTextureS3TC(WebGLRenderingContextBase& context)
    : WebGLExtension(context)
{
    auto& extensions = context.graphicsContextGL()->getExtensions();
    extensions.ensureEnabled("GL_EXT_texture_compression_dxt1");
    extensions.ensureEnabled("GL_ANGLE_texture_compression_dxt3");
    extensions.ensureEnabled("GL_ANGLE_texture_compression_dxt5");

    context.addCompressedTextureFormat(ExtensionsGL::COMPRESSED_RGB_S3TC_DXT1_EXT);
    context.addCompressedTextureFormat(ExtensionsGL::COMPRESSED_RGBA_S3TC_DXT1_EXT);
    context.addCompressedTextureFormat(ExtensionsGL::COMPRESSED_RGBA_S3TC_DXT3_EXT);
    context.addCompressedTextureFormat(ExtensionsGL::COMPRESSED_RGBA_S3TC_DXT5_EXT);
}

WebGLCompressedTextureS3TC::~WebGLCompressedTextureS3TC() = default;

WebGLExtension::ExtensionName WebGLCompressedTextureS3TC::getName() const
{
    return WebGLCompressedTextureS3TCName;
}

bool WebGLCompressedTextureS3TC::supported(WebGLRenderingContextBase& context)
{
    auto& extensions = context.graphicsContextGL()->getExtensions();
#if USE(ANGLE)
    return extensions.supports("GL_EXT_texture_compression_dxt1")
        && extensions.supports("GL_ANGLE_texture_compression_dxt3")
        && extensions.supports("GL_ANGLE_texture_compression_dxt5");
#else
    return extensions.supports("GL_EXT_texture_compression_s3tc")
        || extensions.supports("GL_EXT_texture_compression_dxt1");
#endif
}

} // namespace WebCore

#endif // ENABLE(WEBGL)