| /* |
| * Copyright (C) 2009 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef WebGLArray_h |
| #define WebGLArray_h |
| |
| #include <algorithm> |
| #include "ExceptionCode.h" |
| #include <wtf/PassRefPtr.h> |
| #include <wtf/RefCounted.h> |
| #include <wtf/RefPtr.h> |
| #include "WebGLArrayBuffer.h" |
| |
| namespace WebCore { |
| |
| class WebGLArray : public RefCounted<WebGLArray> { |
| public: |
| virtual bool isByteArray() const { return false; } |
| virtual bool isUnsignedByteArray() const { return false; } |
| virtual bool isShortArray() const { return false; } |
| virtual bool isUnsignedShortArray() const { return false; } |
| virtual bool isIntArray() const { return false; } |
| virtual bool isUnsignedIntArray() const { return false; } |
| virtual bool isFloatArray() const { return false; } |
| |
| PassRefPtr<WebGLArrayBuffer> buffer() { |
| return m_buffer; |
| } |
| |
| void* baseAddress() { |
| return m_baseAddress; |
| } |
| |
| unsigned byteOffset() const { |
| return m_byteOffset; |
| } |
| |
| virtual unsigned length() const = 0; |
| virtual unsigned byteLength() const = 0; |
| virtual PassRefPtr<WebGLArray> slice(int start, int end) = 0; |
| |
| virtual ~WebGLArray(); |
| |
| protected: |
| WebGLArray(PassRefPtr<WebGLArrayBuffer> buffer, unsigned byteOffset); |
| |
| void setImpl(WebGLArray* array, unsigned byteOffset, ExceptionCode& ec); |
| |
| void calculateOffsetAndLength(int start, int end, unsigned arraySize, |
| unsigned* offset, unsigned* length); |
| |
| // Helper to verify that a given sub-range of an ArrayBuffer is |
| // within range. |
| template <typename T> |
| static bool verifySubRange(PassRefPtr<WebGLArrayBuffer> buffer, |
| unsigned byteOffset, |
| unsigned numElements) |
| { |
| if (!buffer) |
| return false; |
| if (sizeof(T) > 1 && byteOffset % sizeof(T)) |
| return false; |
| if (byteOffset > buffer->byteLength()) |
| return false; |
| unsigned remainingElements = (buffer->byteLength() - byteOffset) / sizeof(T); |
| if (numElements > remainingElements) |
| return false; |
| return true; |
| } |
| |
| template <typename T> |
| static void clampOffsetAndNumElements(PassRefPtr<WebGLArrayBuffer> buffer, |
| unsigned *byteOffset, |
| unsigned *numElements) |
| { |
| *byteOffset = std::min(buffer->byteLength(), *byteOffset); |
| unsigned remainingElements = (buffer->byteLength() - *byteOffset) / sizeof(T); |
| *numElements = std::min(remainingElements, *numElements); |
| } |
| |
| // This is the address of the WebGLArrayBuffer's storage, plus the byte offset. |
| void* m_baseAddress; |
| |
| unsigned m_byteOffset; |
| |
| private: |
| RefPtr<WebGLArrayBuffer> m_buffer; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // WebGLArray_h |