X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Ffract.c;fp=src%2Ffract.c;h=0000000000000000000000000000000000000000;hb=ba648ddfc62fc6d3f47294aa8bfc10ea6ca3f479;hp=6eeb6787611475468edfa3e68593674f335184a5;hpb=3398fc6c4188104048f99b650a6cb90beda9b6ed;p=dosdemo

diff --git a/src/fract.c b/src/fract.c
deleted file mode 100644
index 6eeb678..0000000
--- a/src/fract.c
+++ /dev/null
@@ -1,95 +0,0 @@
-#include <string.h>
-#include <limits.h>
-#include "demo.h"
-#include "screen.h"
-#include "gfxutil.h"
-
-struct vec2x {
-	long x, y;
-};
-
-static int init(void);
-static void destroy(void);
-static void draw(void);
-static int julia(long x, long y, long cx, long cy, int max_iter);
-
-static struct screen scr = {
-	"fract",
-	init,
-	destroy,
-	0, 0,
-	draw
-};
-
-/*static long aspect_24x8 = (long)(1.3333333 * 256.0);*/
-static long xscale_24x8 = (long)(1.3333333 * 1.2 * 256.0);
-static long yscale_24x8 = (long)(1.2 * 256.0);
-static int cx, cy;
-static int max_iter = 50;
-
-#define WALK_SIZE	20
-
-struct screen *fract_screen(void)
-{
-	return &scr;
-}
-
-static int init(void)
-{
-	return 0;
-}
-
-static void destroy(void)
-{
-}
-
-static void draw(void)
-{
-	int i, j;
-	unsigned short *pixels = fb_pixels;
-
-	cx = mouse_x;
-	cy = mouse_y;
-
-	for(i=0; i<fb_height; i++) {
-		for(j=0; j<fb_width; j++) {
-			unsigned char pidx = julia(j, i, cx, cy, max_iter) & 0xff;
-			*pixels++ = (pidx >> 3) | ((pidx >> 2) << 5) | ((pidx >> 3) << 11);
-		}
-	}
-
-	pixels = fb_pixels;
-	pixels[mouse_y * fb_width + mouse_x] = 0xffe;
-	swap_buffers(0);
-}
-
-static long normalize_coord(long x, long range)
-{
-	/* 2 * x / range - 1*/
-	return (x << 17) / range - 65536;
-}
-
-static int julia(long x, long y, long cx, long cy, int max_iter)
-{
-	int i;
-
-	/* convert to fixed point roughly [-1, 1] */
-	x = (normalize_coord(x, fb_width) >> 8) * xscale_24x8;
-	y = (normalize_coord(y, fb_height) >> 8) * yscale_24x8;
-	cx = (normalize_coord(cx, fb_width) >> 8) * xscale_24x8;
-	cy = (normalize_coord(cy, fb_height) >> 8) * yscale_24x8;
-
-	for(i=0; i<max_iter; i++) {
-		/* z_n = z_{n-1}**2 + c */
-		long px = x >> 8;
-		long py = y >> 8;
-
-		if(px * px + py * py > (4 << 16)) {
-			break;
-		}
-		x = px * px - py * py + cx;
-		y = (px * py << 1) + cy;
-	}
-
-	return i < max_iter ? (256 * i / max_iter) : 0;
-}