1 /* 2 * Copyright (C) 2009 Apple 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 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef WebGLBuffer_h 27 #define WebGLBuffer_h 28 29 #include "CanvasObject.h" 30 #include "WebGLArrayBuffer.h" 31 32 #include <wtf/PassRefPtr.h> 33 #include <wtf/RefCounted.h> 34 35 namespace WebCore { 36 37 class WebGLBuffer : public CanvasObject { 38 public: 39 virtual ~WebGLBuffer() { deleteObject(); } 40 41 static PassRefPtr<WebGLBuffer> create(WebGLRenderingContext*); 42 43 // For querying previously created objects via e.g. getFramebufferAttachmentParameter 44 // FIXME: should consider canonicalizing these objects 45 static PassRefPtr<WebGLBuffer> create(WebGLRenderingContext*, Platform3DObject); 46 47 bool associateBufferData(unsigned long target, int size); 48 bool associateBufferData(unsigned long target, WebGLArray* array); 49 bool associateBufferSubData(unsigned long target, long offset, WebGLArray* array); 50 51 unsigned byteLength(unsigned long target) const; 52 const WebGLArrayBuffer* elementArrayBuffer() const { return m_elementArrayBuffer.get(); } 53 54 // Gets the cached max index for the given type. Returns -1 if 55 // none has been set. 56 long getCachedMaxIndex(unsigned long type); 57 // Sets the cached max index for the given type. 58 void setCachedMaxIndex(unsigned long type, long value); 59 60 protected: 61 WebGLBuffer(WebGLRenderingContext*); 62 WebGLBuffer(WebGLRenderingContext*, Platform3DObject obj); 63 64 virtual void _deleteObject(Platform3DObject o); 65 66 private: 67 RefPtr<WebGLArrayBuffer> m_elementArrayBuffer; 68 unsigned m_elementArrayBufferByteLength; 69 unsigned m_arrayBufferByteLength; 70 71 // Optimization for index validation. For each type of index 72 // (i.e., UNSIGNED_SHORT), cache the maximum index in the 73 // entire buffer. 74 // 75 // This is sufficient to eliminate a lot of work upon each 76 // draw call as long as all bound array buffers are at least 77 // that size. 78 struct MaxIndexCacheEntry { 79 unsigned long type; 80 long maxIndex; 81 }; 82 // OpenGL ES 2.0 only has two valid index types (UNSIGNED_BYTE 83 // and UNSIGNED_SHORT), but might as well leave open the 84 // possibility of adding others. 85 MaxIndexCacheEntry m_maxIndexCache[4]; 86 unsigned m_nextAvailableCacheEntry; 87 88 // Clears all of the cached max indices. 89 void clearCachedMaxIndices(); 90 }; 91 92 } // namespace WebCore 93 94 #endif // WebGLBuffer_h 95
