41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
#include <stdio.h>
|
|
#include <math.h>
|
|
|
|
int
|
|
main(int argc, char** argv)
|
|
{
|
|
// Change these values to generate different patterns in the copper list
|
|
// http://krazydad.com/tutorials/makecolors.php
|
|
float frequencyr = 0.3, frequencyg = 0.3, frequencyb = 0.3;
|
|
float basePhase = 0;
|
|
float phase1 = basePhase + 0, phase2 = basePhase + 1, phase3 = basePhase + 2;
|
|
float center = 0x7;
|
|
float width = 0x7;
|
|
|
|
// These values are set up for a standard low-res PAL 320x256 playfield
|
|
int startLine = 0x2c; // hard coded value from AHRM
|
|
int screenHeight = 256;
|
|
int endLine = startLine+screenHeight;
|
|
int startHpos = 6;
|
|
int i, line;
|
|
|
|
for (i = 0, line = startLine; line < endLine; ++i, ++line) {
|
|
unsigned char r = (sin(frequencyr*i + phase1) * width + center) + 0.5;
|
|
unsigned char g = (sin(frequencyg*i + phase2) * width + center) + 0.5;
|
|
unsigned char b = (sin(frequencyb*i + phase3) * width + center) + 0.5;
|
|
if (line <= 255) {
|
|
printf("\tdc.w $%x,$fffe\n\tdc.w COLOR00,$%x%x%x\n",line<<8|startHpos|1, r, g, b);
|
|
if (line == 255) {
|
|
printf(".verticalPositionWrapped:\n");
|
|
printf("\tdc.w $%xdf,$fffe\n",line);
|
|
}
|
|
} else {
|
|
printf("\tdc.w $%x,$fffe\n\tdc.w COLOR00,$%x%x%x\n", (line-256)<<8|startHpos|1, r, g, b);
|
|
}
|
|
}
|
|
|
|
printf("\tdc.w $%x,$fffe\n\tdc.w COLOR00,$%x%x%x\n", (line-256)<<8|startHpos|1, 0, 0, 0);
|
|
|
|
return 0;
|
|
}
|