PixelBuffer.h
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上传日期:2009-05-26
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- /*
- s_p_oneil@hotmail.com
- Copyright (c) 2000, Sean O'Neil
- All rights reserved.
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are met:
- * Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- * 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.
- * Neither the name of this project nor the names of its contributors
- may be used to endorse or promote products derived from this software
- without specific prior written permission.
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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 __PixelBuffer_h__
- #define __PixelBuffer_h__
- #include "Matrix.h"
- #define ALIGN_SIZE 64
- #define ALIGN_MASK (ALIGN_SIZE-1)
- #define ALIGN(x) (((unsigned int)x+ALIGN_MASK) & ~ALIGN_MASK)
- typedef enum
- {
- UnsignedByteType = GL_UNSIGNED_BYTE,
- SignedByteType = GL_BYTE,
- UnsignedShortType = GL_UNSIGNED_SHORT,
- SignedShortType = GL_SHORT,
- UnsignedIntType = GL_UNSIGNED_INT,
- SignedIntType = GL_INT,
- FloatType = GL_FLOAT,
- DoubleType = GL_DOUBLE
- } BufferDataType;
- inline const int GetDataTypeSize(const int nDataType)
- {
- int nSize;
- switch(nDataType)
- {
- case UnsignedByteType:
- case SignedByteType:
- nSize = 1;
- break;
- case UnsignedShortType:
- case SignedShortType:
- nSize = 2;
- break;
- case UnsignedIntType:
- case SignedIntType:
- case FloatType:
- nSize = 4;
- break;
- case DoubleType:
- nSize = 8;
- break;
- default:
- nSize = 0;
- break;
- }
- return nSize;
- }
- class C2DBuffer
- {
- protected:
- int m_nWidth; // The width of the buffer
- int m_nHeight; // The height of the buffer
- int m_nDataType; // The data type stored in the buffer (i.e. GL_UNSIGNED_BYTE, GL_FLOAT)
- int m_nChannels; // The number of channels of data stored in the buffer
- int m_nElementSize; // The size of one element in the buffer
- int m_nRowSize; // The size of one row in the buffer
- void *m_pAlloc; // The pointer to the pixel buffer
- void *m_pBuffer; // A byte-aligned pointer (for faster memory access)
- public:
- C2DBuffer() { m_pAlloc = m_pBuffer = NULL; }
- C2DBuffer(const C2DBuffer &buf) { *this = buf; }
- C2DBuffer(const int nWidth, const int nHeight, const int nDataType, const int nChannels=1, void *pBuffer=NULL)
- {
- m_pAlloc = m_pBuffer = NULL;
- Init(nWidth, nHeight, nDataType, nChannels, pBuffer);
- }
- ~C2DBuffer() { Cleanup(); }
- void operator=(const C2DBuffer &buf)
- {
- Init(buf.m_nWidth, buf.m_nHeight, buf.m_nDataType, buf.m_nChannels);
- memcpy(m_pBuffer, buf.m_pBuffer, GetBufferSize());
- }
- bool operator==(const C2DBuffer &buf)
- {
- return (m_nWidth == buf.m_nWidth && m_nHeight == buf.m_nHeight && m_nDataType == buf.m_nDataType && m_nChannels == buf.m_nChannels);
- }
- void *operator[](const int n)
- {
- return (void *)((unsigned int)m_pBuffer + n * m_nElementSize);
- }
- void *operator()(const int x, const int y)
- {
- return (void *)((unsigned int)m_pBuffer + y * m_nRowSize + x * m_nElementSize);
- }
- void Init(const int nWidth, const int nHeight, const int nDataType, const int nChannels=1, void *pBuffer=NULL)
- {
- // If the buffer is already initialized to the specified settings, then nothing needs to be done
- if(m_pAlloc && m_nWidth == nWidth && m_nHeight == nHeight && m_nDataType == nDataType && m_nChannels == nChannels)
- return;
- Cleanup();
- m_nWidth = nWidth;
- m_nHeight = nHeight;
- m_nDataType = nDataType;
- m_nChannels = nChannels;
- m_nElementSize = m_nChannels * GetDataTypeSize(m_nDataType);
- m_nRowSize = m_nWidth * m_nElementSize;
- if(pBuffer)
- m_pBuffer = pBuffer;
- else
- {
- m_pAlloc = new unsigned char[GetBufferSize() + ALIGN_MASK];
- m_pBuffer = (void *)ALIGN(m_pAlloc);
- }
- }
- void Cleanup()
- {
- if(m_pAlloc)
- {
- delete m_pAlloc;
- m_pAlloc = m_pBuffer = NULL;
- }
- }
- int GetWidth() const { return m_nWidth; }
- int GetHeight() const { return m_nHeight; }
- int GetDataType() const { return m_nDataType; }
- int GetChannels() const { return m_nChannels; }
- int GetBufferSize() const { return m_nHeight * m_nRowSize; }
- void *GetBuffer() const { return m_pBuffer; }
- void ClearBuffer() { memset(m_pBuffer, 0, GetBufferSize()); }
- void SwapBuffers(C2DBuffer &buf)
- {
- void *pTemp;
- ASSERT(*this == buf);
- SWAP(m_pAlloc, buf.m_pAlloc, pTemp);
- SWAP(m_pBuffer, buf.m_pBuffer, pTemp);
- }
- };
- /*******************************************************************************
- * Class: CPixelBuffer
- ********************************************************************************
- * This class implements a general-purpose pixel buffer to be used for anything.
- * It is often used by CTexture to set up OpenGL textures, so many of the
- * parameters you use to initialize it look like the parameters you would pass
- * to glTexImage1D or glTexImage2D. Some of the standard pixel buffer routines
- * call fast MMX functions implemented in PixelBuffer.asm.
- *******************************************************************************/
- class CPixelBuffer : public C2DBuffer
- {
- protected:
- int m_nFormat; // The format of the pixel data (i.e. GL_LUMINANCE, GL_RGBA)
- public:
- CPixelBuffer() : C2DBuffer() {}
- CPixelBuffer(int nWidth, int nHeight, int nChannels=3, int nFormat=GL_RGB, int nDataType=UnsignedByteType) : C2DBuffer(nWidth, nHeight, nDataType, nChannels)
- {
- m_nFormat = nFormat;
- }
- int GetFormat() { return m_nFormat; }
- void Init(int nWidth, int nHeight, int nChannels=3, int nFormat=GL_RGB, int nDataType=GL_UNSIGNED_BYTE, void *pBuffer=NULL)
- {
- C2DBuffer::Init(nWidth, nHeight, nDataType, nChannels, pBuffer);
- m_nFormat = nFormat;
- }
- // Miscellaneous initalization routines
- void MakeRandom(unsigned int nSeed);
- void MakeNoise(unsigned long nSeed);
- void MakeGlow(float fExpose=5.75f, float fSizeDisc=0);
- #define ATMOSPHERE_2D
- void MakeAtmosphere(float fExpose);
- void MakeCloudCell(float fExpose=5.75f, float fSizeDisc=0);
- };
- #endif // __PixelBuffer_h__