/* $Id: colormac.h,v 1.4 2000/11/24 10:25:05 keithw 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" /* Do not reference mtypes.h from this file. */ /* * 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 */