mirror of
https://github.com/sehugg/8bitworkshop.git
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154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
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/*****************************************************************************\
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** mandelbrot sample program for cc65. **
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** **
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** (w) 2002 by groepaz/hitmen, TGI support by Stefan Haubenthal **
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\*****************************************************************************/
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#include <stdlib.h>
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#include <time.h>
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#include <conio.h>
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#include <tgi.h>
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#include <cc65.h>
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/* Graphics definitions */
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#define SCREEN_X (tgi_getxres())
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#define SCREEN_Y (tgi_getyres())
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#define MAXCOL (tgi_getcolorcount())
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#define maxiterations 32
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#define fpshift (10)
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#define tofp(_x) ((_x)<<fpshift)
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#define fromfp(_x) ((_x)>>fpshift)
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#define fpabs(_x) (abs(_x))
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#define mulfp(_a,_b) ((((signed long)_a)*(_b))>>fpshift)
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#define divfp(_a,_b) ((((signed long)_a)<<fpshift)/(_b))
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/* Workaround missing clock stuff */
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#ifdef __APPLE2__
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# define clock() 0
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# define CLK_TCK 1
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#endif
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/* Use dynamically loaded driver by default */
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#ifndef DYN_DRV
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# define DYN_DRV 0
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#endif
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/* Use static local variables for speed */
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//#pragma static-locals (1);
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void mandelbrot (signed short x1, signed short y1, signed short x2,
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signed short y2)
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{
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register unsigned char count;
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register signed short r, r1, i;
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register signed short xs, ys, xx, yy;
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register signed short x, y;
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/* Calc stepwidth */
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xs = ((x2 - x1) / (SCREEN_X));
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ys = ((y2 - y1) / (SCREEN_Y));
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yy = y1;
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for (y = 0; y < (SCREEN_Y); y++) {
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yy += ys;
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xx = x1;
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for (x = 0; x < (SCREEN_X); x++) {
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xx += xs;
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/* Do iterations */
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r = 0;
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i = 0;
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for (count = 0; (count < maxiterations) &&
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(fpabs (r) < tofp (2)) && (fpabs (i) < tofp (2));
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++count) {
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r1 = (mulfp (r, r) - mulfp (i, i)) + xx;
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/* i = (mulfp(mulfp(r,i),tofp(2)))+yy; */
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i = (((signed long) r * i) >> (fpshift - 1)) + yy;
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r = r1;
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}
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if (count == maxiterations) {
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tgi_setcolor (0);
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} else {
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if (MAXCOL == 2) {
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tgi_setcolor (1);
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} else {
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tgi_setcolor (count % MAXCOL);
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}
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}
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/* Set pixel */
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tgi_setpixel (x, y);
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}
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}
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}
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int main (void)
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{
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clock_t t;
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unsigned long sec;
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unsigned sec10;
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unsigned char err;
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clrscr ();
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#if DYN_DRV
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/* Load the graphics driver */
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cprintf ("initializing... mompls\r\n");
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tgi_load_driver (tgi_stddrv);
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#else
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/* Install the graphics driver */
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tgi_install (a2_lo_tgi);
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#endif
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err = tgi_geterror ();
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if (err != TGI_ERR_OK) {
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cprintf ("Error #%d initializing graphics.\r\n%s\r\n",
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err, tgi_geterrormsg (err));
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if (doesclrscrafterexit ()) {
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cgetc ();
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}
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exit (EXIT_FAILURE);
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};
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cprintf ("ok.\n\r");
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/* Initialize graphics */
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tgi_init ();
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tgi_clear ();
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t = clock ();
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/* Calc mandelbrot set */
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mandelbrot (tofp (-2), tofp (-2), tofp (2), tofp (2));
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t = clock () - t;
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/* Fetch the character from the keyboard buffer and discard it */
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cgetc ();
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/* Shut down gfx mode and return to textmode */
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tgi_done ();
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/* Calculate stats */
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sec = (t * 10) / CLK_TCK;
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sec10 = sec % 10;
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sec /= 10;
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/* Output stats */
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cprintf ("time : %lu.%us\n\r", sec, sec10);
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if (doesclrscrafterexit ()) {
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/* Wait for a key, then end */
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cputs ("Press any key when done...\n\r");
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cgetc ();
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}
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/* Done */
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return EXIT_SUCCESS;
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}
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