145 lines
3.1 KiB
C++
145 lines
3.1 KiB
C++
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/*
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* Copyright (c) 1993-1995 Argonaut Technologies Limited. All rights reserved.
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*
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* $Id: mkranges.c 1.2 1995/03/01 16:08:38 sam Exp $
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* $Locker: $
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*
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* Calculates a ramped palette
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*
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* Produces -
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* A pixelmap containting the palette (1,256 RGBX_888)
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*
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* $BC<"make -f mkranges.mak %s.obj;">
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <math.h>
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#include "brender.h"
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/*
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* Number of entries in a palette
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*/
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#define PAL_SIZE 256
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static br_colour MakeColour(br_colour a, br_colour d, br_colour s,float cut, float level);
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int main(int argc, char ** argv)
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{
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char line_buffer[256],*output_name,*input_name,*cp;
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br_pixelmap *palette;
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int base,range;
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int ar,ag,ab;
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int dr,dg,db;
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int sr,sg,sb;
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float cut;
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int n,line_number=0;
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FILE *infile;
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BR_BANNER("MKRANGES","1994-1995","$Revision: 1.2 $");
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if(argc != 3) {
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fprintf(stderr,"Usage: mkranges <input-script> <output-pixmap>\n");
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return 0;
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}
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input_name = argv[1];
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output_name = argv[2];
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BrBegin();
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/*
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* Try to open the script file for input
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*/
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infile = fopen(input_name,"rt");
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if(infile == NULL)
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BR_ERROR1("Could not open \"%s\" for input\n",input_name);
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/*
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* Allocate the output palette
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*/
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palette = BrPixelmapAllocate(BR_PMT_RGBX_888,1,PAL_SIZE,NULL,0);
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/*
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* Process a line at a time from the input file
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*/
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line_number = 0;
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while(fgets(line_buffer, BR_ASIZE(line_buffer), infile)) {
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line_number++;
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/*
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* Skip coments and blank lines
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*/
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cp = line_buffer;
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while(isspace(*cp))
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cp++;
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if(*cp == '#' || *cp == '\0')
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continue;
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n = sscanf(line_buffer,
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/* Range Ambient Diffuse Specular Cut */
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"%d,%d %d,%d,%d %d,%d,%d %d,%d,%d %f",
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&base,&range,&ar,&ag,&ab,&dr,&dg,&db,&sr,&sg,&sb,&cut);
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if(n != 12)
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BR_ERROR1("Not enough parameters on line %d",line_number);
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if(base < 0 || base >= PAL_SIZE)
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BR_ERROR1("Base is invalid on line %d",line_number);
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if((base+range) < 0 || (base+range) > PAL_SIZE)
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BR_ERROR1("Range is invalid on line %d",line_number);
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/*
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* Make the range
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*/
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cp = palette->pixels;
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cp += base * palette->row_bytes;
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for(n = 0 ; n < range; n++, cp+=palette->row_bytes)
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*(br_colour *)cp =
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MakeColour(BR_COLOUR_RGB(ar,ag,ab),
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BR_COLOUR_RGB(dr,dg,db),
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BR_COLOUR_RGB(sr,sg,sb),
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cut,
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n/(float)range);
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}
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/*
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* Save the output palette
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*/
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palette->identifier = "Palette";
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BrPixelmapSave(output_name,palette);
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BrEnd();
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return 0;
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}
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/*
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* Construct a colour at ome point along a ramp
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*
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* level = 0 cut 1.0
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* colour = ambient -----------> diffuse -> specular
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*/
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static br_colour MakeColour(br_colour a, br_colour d, br_colour s,float cut, float level)
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{
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int r,g,b;
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if(level < cut) {
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level /= cut;
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return BR_COLOUR_RGB(
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(1.0-level) * BR_RED(a) + level * BR_RED(d),
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(1.0-level) * BR_GRN(a) + level * BR_GRN(d),
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(1.0-level) * BR_BLU(a) + level * BR_BLU(d));
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} else {
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level = (level-cut)/(1.0 - cut);
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return BR_COLOUR_RGB(
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(1.0-level) * BR_RED(d) + level * BR_RED(s),
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(1.0-level) * BR_GRN(d) + level * BR_GRN(s),
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(1.0-level) * BR_BLU(d) + level * BR_BLU(s));
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}
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}
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