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/**
* \file colormac.h
* Color-related macros
*/
/*
* Mesa 3-D graphics library
* Version: 5.1
*
* Copyright (C) 1999-2003 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.
*/
#ifndef COLORMAC_H
#define COLORMAC_H
#include "imports.h"
#include "config.h"
#include "macros.h"
/** \def BYTE_TO_CHAN
* Convert from GLbyte to GLchan */
/** \def UBYTE_TO_CHAN
* Convert from GLubyte to GLchan */
/** \def SHORT_TO_CHAN
* Convert from GLshort to GLchan */
/** \def USHORT_TO_CHAN
* Convert from GLushort to GLchan */
/** \def INT_TO_CHAN
* Convert from GLint to GLchan */
/** \def UINT_TO_CHAN
* Convert from GLuint to GLchan */
/** \def CHAN_TO_UBYTE
* Convert from GLchan to GLubyte */
/** \def CHAN_TO_FLOAT
* Convert from GLchan to GLfloat */
/** \def CLAMPED_FLOAT_TO_CHAN
* Convert from GLclampf to GLchan */
/** \def UNCLAMPED_FLOAT_TO_CHAN
* Convert from GLfloat to GLchan */
/** \def COPY_CHAN4
* Copy a GLchan[4] array */
/** \def CHAN_PRODUCT
* Scaled product (usually approximated) between two GLchan arguments */
#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.
*
* \param dst pointer to destination GLchan[3] array.
* \param f pointer to source GLfloat[3] array.
*
* \sa #UNCLAMPED_FLOAT_TO_CHAN.
*/
#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.
*
* \param dst pointer to destination GLchan[4] array.
* \param f pointer to source GLfloat[4] array.
*
* \sa #UNCLAMPED_FLOAT_TO_CHAN.
*/
#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)
/**
* \name Generic color packing macros
*
* \todo We may move these into texutil.h at some point.
*/
/*@{*/
#define PACK_COLOR_8888( a, b, c, d ) \
(((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
#define PACK_COLOR_888( a, b, c ) \
(((a) << 16) | ((b) << 8) | (c))
#define PACK_COLOR_565( a, b, c ) \
((((a) & 0xf8) << 8) | (((b) & 0xfc) << 3) | (((c) & 0xf8) >> 3))
#define PACK_COLOR_1555( a, b, c, d ) \
((((b) & 0xf8) << 7) | (((c) & 0xf8) << 2) | (((d) & 0xf8) >> 3) | \
((a) ? 0x8000 : 0))
#define PACK_COLOR_4444( a, b, c, d ) \
((((a) & 0xf0) << 8) | (((b) & 0xf0) << 4) | ((c) & 0xf0) | ((d) >> 4))
#define PACK_COLOR_88( a, b ) \
(((a) << 8) | (b))
#define PACK_COLOR_332( a, b, c ) \
(((a) & 0xe0) | (((b) & 0xe0) >> 3) | (((c) & 0xc0) >> 6))
#ifdef MESA_BIG_ENDIAN
#define PACK_COLOR_8888_LE( a, b, c, d ) PACK_COLOR_8888( d, c, b, a )
#define PACK_COLOR_565_LE( a, b, c ) \
(((a) & 0xf8) | (((b) & 0xe0) >> 5) | (((b) & 0x1c) << 11) | \
(((c) & 0xf8) << 5))
#define PACK_COLOR_1555_LE( a, b, c, d ) \
((((b) & 0xf8) >> 1) | (((c) & 0xc0) >> 6) | (((c) & 0x38) << 10) | \
(((d) & 0xf8) << 5) | ((a) ? 0x80 : 0))
#define PACK_COLOR_4444_LE( a, b, c, d ) PACK_COLOR_4444( c, d, a, b )
#define PACK_COLOR_88_LE( a, b ) PACK_COLOR_88( b, a )
#else /* little endian */
#define PACK_COLOR_8888_LE( a, b, c, d ) PACK_COLOR_8888( a, b, c, d )
#define PACK_COLOR_565_LE( a, b, c ) PACK_COLOR_565( a, b, c )
#define PACK_COLOR_1555_LE( a, b, c, d ) PACK_COLOR_1555( a, b, c, d )
#define PACK_COLOR_4444_LE( a, b, c, d ) PACK_COLOR_4444( a, b, c, d )
#define PACK_COLOR_88_LE( a, b ) PACK_COLOR_88( a, b )
#endif /* endianness */
/*@}*/
#endif /* COLORMAC_H */
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