reorganized the source code

[dosdemo] / src / fract.c

diff --git a/src/fract.c b/src/fract.c
deleted file mode 100644 (file)
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;
-}