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 "ArrayBuffer.h" 30 #include "WebGLObject.h" 31 32 #include <wtf/PassRefPtr.h> 33 #include <wtf/RefCounted.h> 34 35 namespace WebCore { 36 class ArrayBufferView; 37 38 class WebGLBuffer : public WebGLObject { 39 public: 40 virtual ~WebGLBuffer() { deleteObject(); } 41 42 static PassRefPtr<WebGLBuffer> create(WebGLRenderingContext*); 43 44 bool associateBufferData(GC3Dsizeiptr size); 45 bool associateBufferData(ArrayBuffer*); 46 bool associateBufferData(ArrayBufferView*); 47 bool associateBufferSubData(GC3Dintptr offset, ArrayBuffer*); 48 bool associateBufferSubData(GC3Dintptr offset, ArrayBufferView*); 49 50 GC3Dsizeiptr byteLength() const; 51 const ArrayBuffer* elementArrayBuffer() const { return m_elementArrayBuffer.get(); } 52 53 // Gets the cached max index for the given type. Returns -1 if 54 // none has been set. 55 int getCachedMaxIndex(GC3Denum type); 56 // Sets the cached max index for the given type. 57 void setCachedMaxIndex(GC3Denum type, int value); 58 59 GC3Denum getTarget() const { return m_target; } 60 void setTarget(GC3Denum); 61 62 bool hasEverBeenBound() const { return object() && m_target; } 63 64 protected: 65 WebGLBuffer(WebGLRenderingContext*); 66 67 virtual void deleteObjectImpl(Platform3DObject o); 68 69 private: 70 virtual bool isBuffer() const { return true; } 71 72 GC3Denum m_target; 73 74 RefPtr<ArrayBuffer> m_elementArrayBuffer; 75 GC3Dsizeiptr m_byteLength; 76 77 // Optimization for index validation. For each type of index 78 // (i.e., UNSIGNED_SHORT), cache the maximum index in the 79 // entire buffer. 80 // 81 // This is sufficient to eliminate a lot of work upon each 82 // draw call as long as all bound array buffers are at least 83 // that size. 84 struct MaxIndexCacheEntry { 85 GC3Denum type; 86 int maxIndex; 87 }; 88 // OpenGL ES 2.0 only has two valid index types (UNSIGNED_BYTE 89 // and UNSIGNED_SHORT), but might as well leave open the 90 // possibility of adding others. 91 MaxIndexCacheEntry m_maxIndexCache[4]; 92 unsigned int m_nextAvailableCacheEntry; 93 94 // Clears all of the cached max indices. 95 void clearCachedMaxIndices(); 96 97 // Helper function called by the three associateBufferData(). 98 bool associateBufferDataImpl(ArrayBuffer* array, GC3Dintptr byteOffset, GC3Dsizeiptr byteLength); 99 // Helper function called by the two associateBufferSubData(). 100 bool associateBufferSubDataImpl(GC3Dintptr offset, ArrayBuffer* array, GC3Dintptr arrayByteOffset, GC3Dsizeiptr byteLength); 101 }; 102 103 } // namespace WebCore 104 105 #endif // WebGLBuffer_h 106
