Added MAP patching example (press button Y to enable / disable it)

sample/game/sonic/inc/level.h

@@ -23,7 +23,7 @@ void LEVEL_updateMapAlternate(VDPPlane plane, Map* map, s16 xmt, s16 ymt);
 void LEVEL_updateVDPScroll();
 
 void LEVEL_onVBlank(void);
-void LEVEL_handleInput(u16 value);
+void LEVEL_doJoyAction(u16 joy, u16 changed, u16 state);
 
 
 #endif // _LEVEL_H_

sample/game/sonic/src/level.c

@@ -21,6 +21,10 @@ Map *bga;
 u16 bgBaseTileIndex[2];
 
 
+// forward
+static void PatchDataCallback(Map *map, u16 *buf, u16 x, u16 y, MapUpdateType updateType, u16 size);
+
+
 u16 LEVEL_init(u16 vramIndex)
 {
     u16 ind;
@@ -167,9 +171,45 @@ void LEVEL_updateMapAlternate(VDPPlane plane, Map* map, s16 xmt, s16 ymt)
 }
 
 
+void LEVEL_doJoyAction(u16 joy, u16 changed, u16 state)
+{
+    if (changed & state & BUTTON_X)
+    {
+        if (bga->mapDataPatchCB != NULL) MAP_setDataPatchCallback(bga, NULL);
+        else  MAP_setDataPatchCallback(bga, PatchDataCallback);
+    }
+}
+
+
 void LEVEL_onVBlank(void)
 {
     // reset tilemap buffer position after update
     bufOffset = 0;
 }
 
+
+static void PatchDataCallback(Map *map, u16 *buf, u16 x, u16 y, MapUpdateType updateType, u16 size)
+{
+    u16* dst = buf;
+    u16 xt = x;
+    u16 yt = y;
+    u16 i = size;
+
+    while(i--)
+    {
+        u16 tileData = *dst;
+
+        // remove palette info
+        tileData &= ~TILE_ATTR_PALETTE_MASK;
+        // set palette depending tile position (just for fun)
+        tileData |= ((xt ^ yt) & 3) << TILE_ATTR_PALETTE_SFT;
+
+        // set back tile data
+        *dst++ = tileData;
+
+        // just to keep track of current tile position
+        if (updateType == ROW_UPDATE) xt++;
+        else yt++;
+    }
+}
+

sample/game/sonic/src/main.c

@@ -139,9 +139,10 @@ static void joyEvent(u16 joy, u16 changed, u16 state)
     // can't do more in paused state
     if (paused) return;
 
-    // handle player / camera joy actions
+    // handle player / camera / level joy actions
     PLAYER_doJoyAction(joy, changed, state);
     CAMERA_doJoyAction(joy, changed, state);
+    LEVEL_doJoyAction(joy, changed, state);
 }
 
 static void vblank()

sample/game/sonic/src/player.c

@@ -173,7 +173,7 @@ void PLAYER_handleInput(u16 value)
 
 void PLAYER_doJoyAction(u16 joy, u16 changed, u16 state)
 {
-    if (changed & state & (BUTTON_A | BUTTON_B | BUTTON_C | BUTTON_X | BUTTON_Y | BUTTON_Z))
+    if (changed & state & (BUTTON_A | BUTTON_B | BUTTON_C))
     {
         if (movY == 0)
         {

sample/game/sonic/src/utils.c

@@ -13,4 +13,3 @@ void setSpritePosition(Sprite* sprite, s16 x, s16 y)
         SPR_setPosition(sprite, x, y);
     }
 }
-