testing on linux

includes/tart.h

@@ -14,13 +14,13 @@
 // | over each cell.
 // #========================================================================#
 
-#define NULL_CELL (struct tart_cell){{0,0,0},{0,0,0},0,0}
+#define NULL_CELL 0
 
 typedef unsigned char tart_byte;
 typedef unsigned short tart_id;
 
 struct tart_vec2 {
-    short x,y;
+    unsigned short x,y;
 };
 
 struct tart_rgb {
@@ -72,6 +72,7 @@ struct tart_buffer {
 struct tart_window {
     struct tart_buffer buffers[0xFF+1];
     tart_byte buffer_count;
+    struct tart_vec2 size;
 };
 
 struct tart_window tart_create_window();