the sin lut was too small for any kind of reasonable resolution in high

[retrobench] / src / rbench.c

diff --git a/src/rbench.c b/src/rbench.c
index 7202c1a..8b9e23f 100644 (file)
--- a/src/rbench.c
+++ b/src/rbench.c
@@ -33,7 +33,7 @@ void cleanup(void)
 
 #define XORRGB(x, y, zoom, r, g, b) \
        do { \
-               int xor = (((x) - fb_width/2) * (zoom) >> 10) ^ (((y) - fb_height/2) * (zoom) >> 10); \
+               int xor = (((x) - fb_width/2) * (zoom) >> 16) ^ (((y) - fb_height/2) * (zoom) >> 16); \
                (r) = xor >> 2; \
                (g) = xor >> 1; \
                (b) = xor; \
@@ -46,9 +46,9 @@ void redraw(void)
        uint16_t *fbptr16;
        uint32_t *fbptr32;
 
-       xoffs = COS(time_msec >> 5) * fb_width >> 7;
-       yoffs = SIN(time_msec >> 4) * fb_height >> 8;
-       zoom = ((SIN(time_msec >> 4) + 256) << 1) + 512;
+       xoffs = COS(time_msec >> 3) * fb_width >> 15;
+       yoffs = SIN(time_msec >> 2) * fb_height >> 16;
+       zoom = (SIN(time_msec >> 5) >> 1) + 65536;
 
        switch(fb_bpp) {
        case 15: