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