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/* $Id: colormac.h,v 1.2 2000/10/29 18:12:14 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2000 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"
/*
* Integer / float conversion for colors, normals, etc.
*/
#define BYTE_TO_UBYTE(b) (b < 0 ? 0 : (GLubyte) b)
#define SHORT_TO_UBYTE(s) (s < 0 ? 0 : (GLubyte) (s >> 7))
#define USHORT_TO_UBYTE(s) (GLubyte) (s >> 8)
#define INT_TO_UBYTE(i) (i < 0 ? 0 : (GLubyte) (i >> 23))
#define UINT_TO_UBYTE(i) (GLubyte) (i >> 24)
/* Convert GLfloat in [0.0,1.0] to GLubyte in [0,255] */
#define FLOAT_TO_UBYTE(X) ((GLubyte) (GLint) (((X)) * 255.0F))
/* Convert GLbyte in [-128,127] to GLfloat in [-1.0,1.0] */
#define BYTE_TO_FLOAT(B) ((2.0F * (B) + 1.0F) * (1.0F/255.0F))
/* Convert GLfloat in [-1.0,1.0] to GLbyte in [-128,127] */
#define FLOAT_TO_BYTE(X) ( (((GLint) (255.0F * (X))) - 1) / 2 )
/* Convert GLushort in [0,65536] to GLfloat in [0.0,1.0] */
#define USHORT_TO_FLOAT(S) ((GLfloat) (S) * (1.0F / 65535.0F))
/* Convert GLfloat in [0.0,1.0] to GLushort in [0,65536] */
#define FLOAT_TO_USHORT(X) ((GLushort) (GLint) ((X) * 65535.0F))
/* Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */
#define SHORT_TO_FLOAT(S) ((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
/* Convert GLfloat in [0.0,1.0] to GLshort in [-32768,32767] */
#define FLOAT_TO_SHORT(X) ( (((GLint) (65535.0F * (X))) - 1) / 2 )
/* Convert GLuint in [0,4294967295] to GLfloat in [0.0,1.0] */
#define UINT_TO_FLOAT(U) ((GLfloat) (U) * (1.0F / 4294967295.0F))
/* Convert GLfloat in [0.0,1.0] to GLuint in [0,4294967295] */
#define FLOAT_TO_UINT(X) ((GLuint) ((X) * 4294967295.0))
/* Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0] */
#define INT_TO_FLOAT(I) ((2.0F * (I) + 1.0F) * (1.0F/4294967294.0F))
/* Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647] */
/* causes overflow:
#define FLOAT_TO_INT(X) ( (((GLint) (4294967294.0F * (X))) - 1) / 2 )
*/
/* a close approximation: */
#define FLOAT_TO_INT(X) ( (GLint) (2147483647.0 * (X)) )
#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_FLOAT(c) UBYTE_TO_FLOAT(c)
#define FLOAT_COLOR_TO_CHAN(c, f) FLOAT_COLOR_TO_UBYTE_COLOR(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) | (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_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
#define FLOAT_COLOR_TO_CHAN(c, f) \
c = ((GLchan) FloatToInt(CLAMP(f, 0.0F, 1.0F) * CHAN_MAXF + 0.5F))
#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
#define CHAN_PRODUCT(a, b) ( (GLchan) ((((GLint) (a)) * ((GLint) (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_FLOAT(c) (c)
#define FLOAT_COLOR_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
#define FLOAT_RGB_TO_CHAN_RGB(dst, f) \
do { \
FLOAT_COLOR_TO_CHAN(dst[0], f[0]); \
FLOAT_COLOR_TO_CHAN(dst[1], f[1]); \
FLOAT_COLOR_TO_CHAN(dst[2], f[2]); \
} while(0)
#define FLOAT_RGBA_TO_CHAN_RGBA(c, f) \
do { \
FLOAT_COLOR_TO_CHAN(c[0], f[0]); \
FLOAT_COLOR_TO_CHAN(c[1], f[1]); \
FLOAT_COLOR_TO_CHAN(c[2], f[2]); \
FLOAT_COLOR_TO_CHAN(c[3], f[3]); \
} while(0)
#if CHAN_BITS == 32
#define FLOAT_TO_CHAN(f) (f)
#define DOUBLE_TO_CHAN(f) ((GLfloat) (f))
#define UNCLAMPED_FLOAT_TO_CHAN(f) (f)
#define UNCLAMPED_DOUBLE_TO_CHAN(f) ((GLfloat) (f))
#else
#define FLOAT_TO_CHAN(f) ( (GLchan) FloatToInt((f) * CHAN_MAXF + 0.5F) )
#define DOUBLE_TO_CHAN(f) ( (GLchan) FloatToInt((f) * CHAN_MAXF + 0.5F) )
#define UNCLAMPED_FLOAT_TO_CHAN(f) \
( (GLchan) FloatToInt( CLAMP(f, 0.0, 1.0) * CHAN_MAXF + 0.5F) )
#define UNCLAMPED_DOUBLE_TO_CHAN(f) \
( (GLchan) FloatToInt( CLAMP(f, 0.0, 1.0) * CHAN_MAXF + 0.5F) )
#endif
#endif /* COLORMAC_H */
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