1 files changed, 19 insertions, 0 deletions
diff --git a/render.h b/render.h
index e7d459f..a30331f 100644
--- a/render.h
+++ b/render.h
@@ -6,6 +6,25 @@
 struct Map;
 
 typedef struct {
+	int x, y;
+	int dx, dy;
+	int sx, sy;
+	int e;
+} Line;
+
+void init_line(
+	Line* l,
+	const int* f,
+	const int* t
+);
+void init_lerp(
+	Line* l,
+	int a, int b,
+	int x, int y
+);
+void step_line(Line* l);
+
+typedef struct {
 	unsigned char r, g, b, a;
 } Colour;