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      1 /*
      2  * Copyright (C) 2012 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/WebGLDepthTexture.h"
     29 
     30 namespace WebCore {
     31 
     32 WebGLDepthTexture::WebGLDepthTexture(WebGLRenderingContextBase* context)
     33     : WebGLExtension(context)
     34 {
     35     ScriptWrappable::init(this);
     36     context->extensionsUtil()->ensureExtensionEnabled("GL_CHROMIUM_depth_texture");
     37 }
     38 
     39 WebGLDepthTexture::~WebGLDepthTexture()
     40 {
     41 }
     42 
     43 WebGLExtensionName WebGLDepthTexture::name() const
     44 {
     45     return WebGLDepthTextureName;
     46 }
     47 
     48 PassRefPtr<WebGLDepthTexture> WebGLDepthTexture::create(WebGLRenderingContextBase* context)
     49 {
     50     return adoptRef(new WebGLDepthTexture(context));
     51 }
     52 
     53 bool WebGLDepthTexture::supported(WebGLRenderingContextBase* context)
     54 {
     55     Extensions3DUtil* extensionsUtil = context->extensionsUtil();
     56     // Emulating the UNSIGNED_INT_24_8_WEBGL texture internal format in terms
     57     // of two separate texture objects is too difficult, so disable depth
     58     // textures unless a packed depth/stencil format is available.
     59     if (!extensionsUtil->supportsExtension("GL_OES_packed_depth_stencil"))
     60         return false;
     61     return extensionsUtil->supportsExtension("GL_CHROMIUM_depth_texture")
     62         || extensionsUtil->supportsExtension("GL_OES_depth_texture")
     63         || extensionsUtil->supportsExtension("GL_ARB_depth_texture");
     64 }
     65 
     66 const char* WebGLDepthTexture::extensionName()
     67 {
     68     return "WEBGL_depth_texture";
     69 }
     70 
     71 } // namespace WebCore
     72