Add map collision detection functions

2 files changed, 17 insertions, 1 deletions

diff --git a/src/map.c b/src/map.c
index 55fc470..87a0b3b 100644
--- a/src/map.c
+++ b/src/map.c
@@ -5,6 +5,7 @@
 
 #include "map.h"
 
+/* current map; set via map_init */
 static const uint8_t *cmap;
 
 void map_init(const uint8_t map[])
@@ -14,7 +15,6 @@ void map_init(const uint8_t map[])
 
 void map_render()
 {
-    const uint8_t *tiles = binary_tiles_start;
     Rect src = { 0, 0, 160, 48 };
     Rect dst = { 0, 0, 8, 8 };
 
@@ -31,3 +31,13 @@ void map_render()
             blitrc(binary_tiles_start, &src, &dst);
         }
 }
+
+uint8_t map_is_blocked(uint16_t x, uint16_t y)
+{
+    return cmap[(x / MAP_TILE_W) + (y / MAP_TILE_H) * MAP_W] >= MAP_FIRST_BLOCKED;
+}
+
+uint8_t map_is_deadly(uint16_t x, uint16_t y)
+{
+    return cmap[(x / MAP_TILE_W) + (y / MAP_TILE_H) * MAP_W] >= MAP_FIRST_DEADLY;
+}
diff --git a/src/map.h b/src/map.h
index 7c08fe5..f36d294 100644
--- a/src/map.h
+++ b/src/map.h
@@ -11,7 +11,13 @@
 
 #define MAP_TILESET_COLS 20
 
+#define MAP_FIRST_BLOCKED 40
+#define MAP_FIRST_DEADLY 100
+
 void map_init(const uint8_t map[]);
 void map_render();
 
+uint8_t map_is_blocked(uint16_t x, uint16_t y);
+uint8_t map_is_deadly(uint16_t x, uint16_t y);
+
 #endif /* _MAP_H */