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      1 /*
      2  * Copyright (C) 2011 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 
     28 #include "core/html/canvas/WebGLCompressedTextureS3TC.h"
     29 
     30 #include "core/html/canvas/WebGLRenderingContext.h"
     31 #include "core/platform/graphics/Extensions3D.h"
     32 
     33 namespace WebCore {
     34 
     35 WebGLCompressedTextureS3TC::WebGLCompressedTextureS3TC(WebGLRenderingContext* context)
     36     : WebGLExtension(context)
     37 {
     38     ScriptWrappable::init(this);
     39     context->addCompressedTextureFormat(Extensions3D::COMPRESSED_RGB_S3TC_DXT1_EXT);
     40     context->addCompressedTextureFormat(Extensions3D::COMPRESSED_RGBA_S3TC_DXT1_EXT);
     41     context->addCompressedTextureFormat(Extensions3D::COMPRESSED_RGBA_S3TC_DXT3_EXT);
     42     context->addCompressedTextureFormat(Extensions3D::COMPRESSED_RGBA_S3TC_DXT5_EXT);
     43 }
     44 
     45 WebGLCompressedTextureS3TC::~WebGLCompressedTextureS3TC()
     46 {
     47 }
     48 
     49 WebGLExtension::ExtensionName WebGLCompressedTextureS3TC::getName() const
     50 {
     51     return WebGLCompressedTextureS3TCName;
     52 }
     53 
     54 PassRefPtr<WebGLCompressedTextureS3TC> WebGLCompressedTextureS3TC::create(WebGLRenderingContext* context)
     55 {
     56     return adoptRef(new WebGLCompressedTextureS3TC(context));
     57 }
     58 
     59 bool WebGLCompressedTextureS3TC::supported(WebGLRenderingContext* context)
     60 {
     61     Extensions3D* extensions = context->graphicsContext3D()->getExtensions();
     62     return extensions->supports("GL_EXT_texture_compression_s3tc")
     63         || (extensions->supports("GL_EXT_texture_compression_dxt1")
     64             && extensions->supports("GL_CHROMIUM_texture_compression_dxt3")
     65             && extensions->supports("GL_CHROMIUM_texture_compression_dxt5"));
     66 }
     67 
     68 const char* WebGLCompressedTextureS3TC::getExtensionName()
     69 {
     70     return "WEBGL_compressed_texture_s3tc";
     71 }
     72 
     73 } // namespace WebCore
     74