drop floating point from the main loop

[retrobench] / src / rbench.c

diff --git a/src/rbench.c b/src/rbench.c
index 3d8eace..4a2c232 100644 (file)
--- a/src/rbench.c
+++ b/src/rbench.c
@@ -4,6 +4,7 @@
 #include <math.h>
 #include "rbench.h"
 #include "treestor.h"
+#include "util.h"
 
 #define DEF_WIDTH      640
 #define DEF_HEIGHT     480
@@ -45,11 +46,10 @@ void redraw(void)
        unsigned char *fbptr;
        uint16_t *fbptr16;
        uint32_t *fbptr32;
-       float t = (float)time_msec / 1000.0f;
 
-       xoffs = cos(t * 0.5f) * DEF_WIDTH * 2;
-       yoffs = sin(t) * DEF_HEIGHT;
-       zoom = (sin(t * 0.75f) * 0.5f + 1.0f) * 1024.0f;
+       xoffs = COS(time_msec >> 5) * fb_width >> 7;
+       yoffs = SIN(time_msec >> 4) * fb_height >> 8;
+       zoom = ((SIN(time_msec >> 4) + 256) << 1) + 512;
 
        switch(fb_bpp) {
        case 15: