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https://github.com/deater/dos33fsprogs.git
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66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/* Bubble table */
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <math.h>
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#define PI 3.14159265358979323846264
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int main(int argc, char **argv) {
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int i,t;
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double d;
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// in other words, scaled to 46+/-256/2pi. and shifted by 2*46
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// the shift is there to remove the offset from u and v
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// being sums of 2 sins and 2 coses.
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// Building in the offset means my coordinates are all positive
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//cos_t .char round(cos((range(256)-92)*2.0*pi/256)*256.0/2.0/pi+46)
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//sin_t .char round(sin((range(256)-92)*2.0*pi/256)*256.0/2.0/pi+46)
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// sine: ; floor(s*sin((x-96)*PI*2/256.0)+48.5);
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int sine_table[256];
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int cos_table[256];
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int s=41; // approximately 1/6.28 in fixed point
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for(i=0;i<256;i++) {
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d=floor(s*sin((i-96)*2.0*PI/256.0)+48.5);
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sine_table[i]=(int)d;
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}
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printf("sines:\n");
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for(i=0;i<256;i++) {
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if (i%16==0) printf("\t.byte\t");
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t=sine_table[i];
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printf("$%02X",t&0xff);
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if (i%16!=15) printf(",");
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else printf("\n");
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}
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for(i=0;i<256;i++) {
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fprintf(stderr,"%d %d\n",i,sine_table[i]);
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}
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for(i=0;i<256;i++) {
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d=floor(s*cos((i-96)*2.0*PI/256.0)+48.5);
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cos_table[i]=(int)d;
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}
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printf("cosines:\n");
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for(i=0;i<256;i++) {
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if (i%16==0) printf("\t.byte\t");
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t=cos_table[i];
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printf("$%02X",t&0xff);
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if (i%16!=15) printf(",");
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else printf("\n");
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}
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}
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