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/* $Id: colormac.h,v 1.1 2003-02-28 11:41:58 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  4.1
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 *
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 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 */
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/*
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 * Color-related macros
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 */
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#ifndef COLORMAC_H
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#define COLORMAC_H
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#include "glheader.h"
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#include "config.h"
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#include "macros.h"
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#include "mmath.h"
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/* Do not reference mtypes.h from this file.
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 */
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#if CHAN_BITS == 8
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#define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (GLchan) (b))
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#define UBYTE_TO_CHAN(b)  (b)
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#define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
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#define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
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#define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
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#define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 24))
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#define CHAN_TO_UBYTE(c)  (c)
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#define CHAN_TO_FLOAT(c)  UBYTE_TO_FLOAT(c)
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#define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_UBYTE(c, f)
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#define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_UBYTE(c, f)
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#define COPY_CHAN4(DST, SRC)  COPY_4UBV(DST, SRC)
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#define CHAN_PRODUCT(a, b)  ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8))
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#elif CHAN_BITS == 16
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#define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
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#define UBYTE_TO_CHAN(b)  ((((GLchan) (b)) << 8) | ((GLchan) (b)))
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#define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) (s))
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#define USHORT_TO_CHAN(s) (s)
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#define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
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#define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 16))
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#define CHAN_TO_UBYTE(c)  ((c) >> 8)
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#define CHAN_TO_FLOAT(c)  ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
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#define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_USHORT(c, f)
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#define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_USHORT(c, f)
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#define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
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#define CHAN_PRODUCT(a, b) ((GLchan) ((((GLuint) (a)) * ((GLuint) (b))) / 65535))
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#elif CHAN_BITS == 32
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/* XXX floating-point color channels not fully thought-out */
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#define BYTE_TO_CHAN(b)   ((GLfloat) ((b) * (1.0F / 127.0F)))
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#define UBYTE_TO_CHAN(b)  ((GLfloat) ((b) * (1.0F / 255.0F)))
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#define SHORT_TO_CHAN(s)  ((GLfloat) ((s) * (1.0F / 32767.0F)))
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#define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
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#define INT_TO_CHAN(i)    ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
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#define UINT_TO_CHAN(i)   ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
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#define CHAN_TO_UBYTE(c)  FLOAT_TO_UBYTE(c)
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#define CHAN_TO_FLOAT(c)  (c)
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#define CLAMPED_FLOAT_TO_CHAN(c, f)  c = (f)
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#define UNCLAMPED_FLOAT_TO_CHAN(c, f)      c = (f)
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#define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
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#define CHAN_PRODUCT(a, b)    ((a) * (b))
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#else
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#error unexpected CHAN_BITS size
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#endif
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/*
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 * Convert 3 channels at once.
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 */
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#define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f)     \
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do {                                            \
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   UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
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   UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
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   UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
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} while (0)
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/*
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 * Convert 4 channels at once.
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 */
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#define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f)    \
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do {                                            \
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   UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
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   UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
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   UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
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   UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]);       \
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} while (0)
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#endif /* COLORMAC_H */