added rudimentary menu screen

[gbajam22] / src / gamescr.c

diff --git a/src/gamescr.c b/src/gamescr.c
index 383ea9d..cc089f2 100644 (file)
--- a/src/gamescr.c
+++ b/src/gamescr.c
@@ -68,6 +68,7 @@ static int32_t xform_sa, xform_ca;    /* for viewport bank/zoom */
 static int xform_s;
 
 static short vblcount;
+static void *prev_iwram_top;
 
 
 static inline void xform_pixel(int *xp, int *yp);
@@ -84,6 +85,8 @@ static int gamescr_start(void)
        uint8_t *cptr;
        struct enemy *enemy;
 
+       prev_iwram_top = iwram_sbrk(0);
+
        gba_setmode(4, DISPCNT_BG2 | DISPCNT_OBJ | DISPCNT_FB1);
 
        vblperf_setcolor(0);
@@ -169,6 +172,7 @@ endspawn:
 
 static void gamescr_stop(void)
 {
+       iwram_brk(prev_iwram_top);
 }
 
 static void gamescr_frame(void)
@@ -219,8 +223,9 @@ static void update(void)
 
        update_keyb();
 
-       if(KEYPRESS(BN_SELECT)) {
-               vox_quality ^= 1;
+       if(KEYPRESS(BN_START)) {
+               /* TODO pause menu */
+               change_screen(find_screen("menu"));
        }
 
        if(keystate) {
@@ -386,8 +391,6 @@ static void gamescr_vblank(void)
        REG_BG2PC = -sa;
        REG_BG2PD = ca;
 
-       keystate = ~REG_KEYINPUT;
-
        if((keystate & (BN_LEFT | BN_RIGHT)) == 0) {
                if(bank) {
                        bank -= bankdir << 4;