minor performance improvements, optional mouse, mouse cursor now drawn

[dosdemo] / src / scr / fract.c

diff --git a/src/scr/fract.c b/src/scr/fract.c
index 6eeb678..09e3bfb 100644 (file)
--- a/src/scr/fract.c
+++ b/src/scr/fract.c
@@ -51,15 +51,15 @@ static void draw(void)
        cx = mouse_x;
        cy = mouse_y;
 
-       for(i=0; i<fb_height; i++) {
-               for(j=0; j<fb_width; j++) {
+       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;
+       pixels[mouse_y * FB_WIDTH + mouse_x] = 0xffe;
        swap_buffers(0);
 }
 
@@ -74,10 +74,10 @@ 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;
+       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 */