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/* $Id: colormac.h,v 1.11 2002/04/04 16:51:52 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Color-related macros
*/
#ifndef COLORMAC_H
#define COLORMAC_H
#include "glheader.h"
#include "config.h"
#include "macros.h"
#include "mmath.h"
/* Do not reference mtypes.h from this file.
*/
#if CHAN_BITS == 8
#define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (GLchan) (b))
#define UBYTE_TO_CHAN(b) (b)
#define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
#define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
#define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
#define UINT_TO_CHAN(i) ((GLchan) ((i) >> 24))
#define CHAN_TO_UBYTE(c) (c)
#define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c)
#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f)
#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f)
#define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC)
#define CHAN_PRODUCT(a, b) ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8))
#elif CHAN_BITS == 16
#define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
#define UBYTE_TO_CHAN(b) ((((GLchan) (b)) << 8) | ((GLchan) (b)))
#define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) (s))
#define USHORT_TO_CHAN(s) (s)
#define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
#define UINT_TO_CHAN(i) ((GLchan) ((i) >> 16))
#define CHAN_TO_UBYTE(c) ((c) >> 8)
#define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_USHORT(c, f)
#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_USHORT(c, f)
#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
#define CHAN_PRODUCT(a, b) ((GLchan) ((((GLuint) (a)) * ((GLuint) (b))) / 65535))
#elif CHAN_BITS == 32
/* XXX floating-point color channels not fully thought-out */
#define BYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 127.0F)))
#define UBYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 255.0F)))
#define SHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 32767.0F)))
#define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
#define INT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
#define UINT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
#define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c)
#define CHAN_TO_FLOAT(c) (c)
#define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
#define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
#define CHAN_PRODUCT(a, b) ((a) * (b))
#else
#error unexpected CHAN_BITS size
#endif
/*
* Convert 3 channels at once.
*/
#define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f) \
do { \
UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \
} while (0)
/*
* Convert 4 channels at once.
*/
#define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \
do { \
UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]); \
} while (0)
#endif /* COLORMAC_H */
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