The bat can inflict chicken TF

sys/sys_graphics.c

@@ -167,6 +167,7 @@ void sys_oval_draw_ext(
     if (x0 == x1 || y0 == y1) { return; }
     if (x0 > x1) { sys_i32 tmp = x0; x0 = x1; x1 = tmp; }
     if (y0 > y1) { sys_i32 tmp = y0; y0 = y1; y1 = tmp; }
+    // TODO: Offset by 1px so that x0/y0 is always included?
 
     // alois' algorithm for this implies the bounds are inclusive 
     x1 -= 1; y1 -= 1;
@@ -235,6 +236,43 @@ void sys_line_draw(
     }
 }
 
+void sys_rect_draw(
+    sys_i32 x0, sys_i32 y0, sys_i32 x1, sys_i32 y1, sys_color c
+) {
+    sys_rect_draw_ext(x0, y0, x1, y1, c, false);
+}
+
+void sys_rect_fill(
+    sys_i32 x0, sys_i32 y0, sys_i32 x1, sys_i32 y1, sys_color c
+) {
+    sys_rect_draw_ext(x0, y0, x1, y1, c, true);
+}
+
+void sys_rect_draw_ext(
+    sys_i32 x0, sys_i32 y0, sys_i32 x1, sys_i32 y1, sys_color c, bool fill
+) {
+    x0 += sys_cam_dx;
+    y0 += sys_cam_dy;
+    x1 += sys_cam_dx;
+    y1 += sys_cam_dy;
+
+    assert(sys_get_initialized());
+
+    if (x0 == x1 || y0 == y1) { return; }
+    
+    if (x0 == x1 || y0 == y1) { return; }
+    if (x0 > x1) { sys_i32 tmp = x0; x0 = x1; x1 = tmp; }
+    if (y0 > y1) { sys_i32 tmp = y0; y0 = y1; y1 = tmp; }
+    // TODO: Offset by 1px so that x0/y0 is always included?
+
+    for (sys_i32 y = y0; y < y1; y++) {
+        bool whole_line = y == y0 || y == y1;
+        sys_scanline_internal_set(
+            x0, x1, y, c, whole_line || fill
+        );
+    }
+}
+
 void sys_spal_set(sys_color c0, sys_screen_color rc1) {
     assert(sys_get_initialized());