disabled dep-files when building on dos, because it goes into an infinite loop

[dosdemo] / src / fract.c

diff --git a/src/fract.c b/src/fract.c
index 15da79d..6eeb678 100644 (file)
--- a/src/fract.c
+++ b/src/fract.c
@@ -12,7 +12,6 @@ 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 int calc_walk(struct vec2x *path, long x, long y, int max_steps);
 
 static struct screen scr = {
        "fract",
@@ -44,14 +43,10 @@ static void destroy(void)
 {
 }
 
-#define PACK_RGB16(r, g, b) \
-       (((((r) >> 3) & 0x1f) << 11) | ((((g) >> 2) & 0x3f) << 5) | (((b) >> 3) & 0x1f))
-
 static void draw(void)
 {
-       int i, j, len, x, y;
+       int i, j;
        unsigned short *pixels = fb_pixels;
-       struct vec2x walkpos[WALK_SIZE];
 
        cx = mouse_x;
        cy = mouse_y;
@@ -64,28 +59,8 @@ static void draw(void)
        }
 
        pixels = fb_pixels;
-
-       if((len = calc_walk(walkpos, mouse_x, mouse_y, WALK_SIZE))) {
-               x = walkpos[0].x >> 16;
-               y = walkpos[0].y >> 16;
-
-               for(i=1; i<len; i++) {
-                       int x0 = x;
-                       int y0 = y;
-                       int x1 = walkpos[i].x >> 16;
-                       int y1 = walkpos[i].y >> 16;
-
-                       if(clip_line(&x0, &y0, &x1, &y1, 0, 0, fb_width - 1, fb_height - 1)) {
-                               draw_line(x0, y0, x1, y1, PACK_RGB16(32, 128, 255));
-                       }
-                       x = x1;
-                       y = y1;
-               }
-       }
-
        pixels[mouse_y * fb_width + mouse_x] = 0xffe;
-
-       swap_buffers(fb_pixels);
+       swap_buffers(0);
 }
 
 static long normalize_coord(long x, long range)
@@ -94,12 +69,6 @@ static long normalize_coord(long x, long range)
        return (x << 17) / range - 65536;
 }
 
-static long device_coord(long x, long range)
-{
-       /* (x + 1) / 2 * (range - 1) */
-       return ((x + 65536) >> 1) * (range - 1);
-}
-
 static int julia(long x, long y, long cx, long cy, int max_iter)
 {
        int i;
@@ -124,30 +93,3 @@ static int julia(long x, long y, long cx, long cy, int max_iter)
 
        return i < max_iter ? (256 * i / max_iter) : 0;
 }
-
-static int calc_walk(struct vec2x *path, long x, long y, int max_steps)
-{
-       int i;
-       long cx, cy;
-
-       /* convert to fixed point roughly [-1, 1] */
-       x = cx = (normalize_coord(x, fb_width) >> 8) * xscale_24x8;
-       y = cy = (normalize_coord(y, fb_height) >> 8) * yscale_24x8;
-
-       for(i=0; i<max_steps; i++) {
-               /* z_n = z_{n-1}**2 + c */
-               long px = x >> 8;
-               long py = y >> 8;
-
-               path[i].x = device_coord((x << 8) / xscale_24x8, fb_width);
-               path[i].y = device_coord((y << 8) / yscale_24x8, fb_height);
-
-               if(px * px + py * py > (4 << 16)) {
-                       break;
-               }
-               x = px * px - py * py + cx;
-               y = (px * py << 1) + cy;
-       }
-
-       return i;
-}