fixed scroll and added json2tmap tool

[mdlife] / src / part_simba.c

diff --git a/src/part_simba.c b/src/part_simba.c
index ea6f3ae..a63834d 100644 (file)
--- a/src/part_simba.c
+++ b/src/part_simba.c
@@ -67,18 +67,15 @@ void simba_start(void)
 
        /* set scrolling to whole screen */
        vdp_setreg(VDP_REG_MODE3, 0);
-       scroll = 0;
-       vdp_setup_addr(VDP_VRAM, 0xf000);       /* hscroll table is at f000, see vdp.S */
-       VDP_DATA = 0;
-       VDP_DATA = 0;
+       scroll = 256;
 }
 
 void simba_update(void)
 {
        if(bnstate & PAD_LEFT) {
-               if(scroll < 0) scroll++;
+               if(scroll > 256) scroll--;
        } else if(bnstate & PAD_RIGHT) {
-               if(scroll > -192) scroll--;
+               if(scroll < 704) scroll++;
        }
        dbgval[0] = scroll;
 }
@@ -86,6 +83,10 @@ void simba_update(void)
 void simba_vblank(void)
 {
        vdp_setup_addr(VDP_VRAM, 0xf000);       /* hscroll table is at f000, see vdp.S */
-       VDP_DATA = scroll;
-       VDP_DATA = scroll >> 1;
+       if(scroll < 512) {
+               VDP_DATA = 0;
+       } else {
+               VDP_DATA = 1024 - scroll;
+       }
+       VDP_DATA = 512 - (scroll >> 1);
 }