From 4a3dddd695eb67d6b137fc9f9ebff9a564cb672c Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Fri, 27 Feb 2026 17:53:01 +0100
Subject: [PATCH] map: maps now only render partially

If target fps is 0 the program does not crash anymore.
---
 src/r_assets.c |  2 --
 src/t_map.c    | 17 +++++++++--------
 src/u_time.c   | 14 ++++++++------
 3 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/src/r_assets.c b/src/r_assets.c
index f407f75..f805170 100644
--- a/src/r_assets.c
+++ b/src/r_assets.c
@@ -13,8 +13,6 @@ void r_asset_init_fallback_tile(void) {
 	const r_color border_mask = 0x222222FF;
 	u_memset(r_asset_fallback_tile, 0, R_TILE_W * R_TILE_H);
 
-	LRTS_UNUSED(border_mask);
-	
 	for (i = 0; i < R_TILE_H/2; i++) {
 		draw_end = 4 * (i + 1);
 
diff --git a/src/t_map.c b/src/t_map.c
index 46cf298..8e09900 100644
--- a/src/t_map.c
+++ b/src/t_map.c
@@ -25,15 +25,16 @@ void t_map_draw(struct t_map *m) {
 	i32 i, j;
 	struct u_vec2 start;
 	struct u_vec2 end;
-
-	start.x = 0;
-	start.y = 0;
-
-	end.x = m->width;
-	end.y = m->height;
-	
-	/* find start tile that is inside of camera viewport */
 	
+	/* estimate the viewport based on the orthogonal map 
+	 * This is not perfect, but it is good enough to avoid drawing a
+	 * full size map.
+	 */
+	start.x = t_main_camera.x / R_TILE_W;
+	start.y = t_main_camera.y / R_TILE_H;
+
+	end.x = ((t_main_camera.x + t_main_camera.viewport_x) / R_TILE_W) * 2;
+	end.y = ((t_main_camera.y + t_main_camera.viewport_y) / R_TILE_H) * 2;
 
 	for (i = start.x; i < end.x; i++) {
 		for (j = start.y; j < end.y; j++) {
diff --git a/src/u_time.c b/src/u_time.c
index 544bdac..9542369 100644
--- a/src/u_time.c
+++ b/src/u_time.c
@@ -11,15 +11,17 @@ u32 u_cap_fps(void) {
 	struct lrts_config* cfg = lrts_cfg();
 
 	target_fps = cfg->target_fps;
-	per_frame = in_sec / target_fps;
-
-	delta = u_timer_delta(&u_fps_timer);
-	delay = per_frame - delta;
 		
 
 	/* 0 target fps means we do not delay */
-	if (target_fps > 0 && delta < per_frame) {
-		p_delay(delay);
+	if (target_fps > 0) {
+		per_frame = in_sec / target_fps;
+
+		delta = u_timer_delta(&u_fps_timer);
+		delay = per_frame - delta;
+		if (delta < per_frame) {
+			p_delay(delay);
+		}
 	}
 	
 	delta = u_timer_end(&u_fps_timer);
-- 
2.30.2