improved the xor effect slightly

[retrobench] / src / rbench.c

diff --git a/src/rbench.c b/src/rbench.c
index 8b9e23f..34a26c6 100644 (file)
--- a/src/rbench.c
+++ b/src/rbench.c
@@ -31,9 +31,9 @@ void cleanup(void)
 {
 }
 
-#define XORRGB(x, y, zoom, r, g, b) \
+#define XORRGB(x, y, dx, dy, zoom, r, g, b) \
        do { \
-               int xor = (((x) - fb_width/2) * (zoom) >> 16) ^ (((y) - fb_height/2) * (zoom) >> 16); \
+               int xor = ((((x) - fb_width/2) * (zoom) >> 16) + (dx)) ^ ((((y) - fb_height/2) * (zoom) >> 16) + (dy)); \
                (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 >> 3) * fb_width >> 15;
-       yoffs = SIN(time_msec >> 2) * fb_height >> 16;
-       zoom = (SIN(time_msec >> 5) >> 1) + 65536;
+       xoffs = COS(time_msec >> 2) * fb_width >> 14;
+       yoffs = SIN(time_msec >> 1) * fb_height >> 15;
+       zoom = (SIN(time_msec >> 3) << 1) + 0x18000;
 
        switch(fb_bpp) {
        case 15:
@@ -56,7 +56,7 @@ void redraw(void)
                fbptr16 = framebuf;
                for(i=0; i<fb_height; i++) {
                        for(j=0; j<fb_width; j++) {
-                               XORRGB(j + xoffs, i + yoffs, zoom, r, g, b);
+                               XORRGB(j, i, xoffs, yoffs, zoom, r, g, b);
                                *fbptr16++ = (((r >> 3) << fb_rshift) & fb_rmask) |
                                        (((g >> 2) << fb_gshift) & fb_gmask) |
                                        (((b >> 3) << fb_bshift) & fb_bmask);
@@ -69,7 +69,7 @@ void redraw(void)
                fbptr = framebuf;
                for(i=0; i<fb_height; i++) {
                        for(j=0; j<fb_width; j++) {
-                               XORRGB(j + xoffs, i + yoffs, zoom, r, g, b);
+                               XORRGB(j, i, xoffs, yoffs, zoom, r, g, b);
                                *fbptr++ = r;
                                *fbptr++ = g;
                                *fbptr++ = b;
@@ -82,7 +82,7 @@ void redraw(void)
                fbptr32 = framebuf;
                for(i=0; i<fb_height; i++) {
                        for(j=0; j<fb_width; j++) {
-                               XORRGB(j + xoffs, i + yoffs, zoom, r, g, b);
+                               XORRGB(j, i, xoffs, yoffs, zoom, r, g, b);
                                *fbptr32++ = (((r) << fb_rshift) & fb_rmask) |
                                        (((g) << fb_gshift) & fb_gmask) |
                                        (((b) << fb_bshift) & fb_bmask);