45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
// http://krazydad.com/tutorials/makecolors.php
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#include <stdio.h>
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#include <math.h>
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int
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main(int argc, char** argv)
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{
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int startLine = 0x2c; // hard coded value from AHRM
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int screenHeight = 256;
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int endLine = startLine+screenHeight;
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int startHpos = 6+8;
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int i, c, line;
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// These values are set up to be in sync with the vertical bars
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float frequencyr = 0.3, frequencyg = 0.3, frequencyb = 0.3;
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float phase1 = 0, phase2 = 2, phase3 = 4;
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float offset = 0;
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float center = 0x7;
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float width = 0x7;
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int hstep = 16;
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for (line = startLine; line < endLine; ++line) {
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for (i = 0, c = startHpos; c < 0xdf; c+= hstep, i++) {
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unsigned char r = (sin(frequencyr*i + phase1 + offset) * width + center) + 0.5;
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unsigned char g = (sin(frequencyg*i + phase2 + offset) * width + center) + 0.5;
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unsigned char b = (sin(frequencyb*i + phase3 + offset) * width + center) + 0.5;
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if (line == 0 && i == 0) {
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} else {
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if (line <= 255) {
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printf("\tdc.w $%x,$fffe\n\tdc.w COLOR00,$%x%x%x\n",line<<8|c|1, r, g, b);
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if (line == 255 && c+hstep >= 0xdf) {
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printf(".verticalPositionWrapped:\n");
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}
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} else {
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printf("\tdc.w $%x,$fffe\n\tdc.w COLOR00,$%x%x%x\n", (line-256)<<8|c|1, r, g, b);
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}
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}
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}
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}
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return 0;
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}
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