/** * \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 */