From 2e5e37b0a5c77f0b3f1cc217b431236b51af5767 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=A1s=20Ortega=20Froysa?= <nicolas@ortegas.org>
Date: Mon, 16 Mar 2026 21:49:02 +0100
Subject: [PATCH] Fix display transformation and star generation for fullscreen
 mode.

---
 src/main.c      | 21 +++++++++++++++------
 src/starfield.c |  6 +++---
 src/starfield.h |  4 +++-
 3 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/src/main.c b/src/main.c
index fb7c007..ff78ac2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -55,6 +55,9 @@ const char *info_format =
 int main() {
 	char title[32];
 	float zoom = 1.0f;
+	float display_width = WINDOW_WIDTH;
+	float display_height = WINDOW_HEIGHT;
+
 	sprintf(title, "SpaceShipSim v%s", VERSION);
 	puts(title);
 
@@ -121,6 +124,12 @@ int main() {
 		// only redraw or run simulation if the timer event has occurred
 		if(redraw)
 		{
+			if(just_toggled_fullscreen)
+			{
+				display_width = al_get_display_width(display);
+				display_height = al_get_display_height(display);
+			}
+
 			if(paused == old_paused && key_is_down(KEY_PAUSE))
 				paused = !paused;
 			else if(paused != old_paused && !key_is_down(KEY_PAUSE))
@@ -176,11 +185,11 @@ int main() {
 			al_identity_transform(&transform);
 			al_scale_transform(&transform, zoom, zoom);
 			al_translate_transform(&transform,
-					WINDOW_WIDTH / 2.0f - ship.x * zoom,
-					WINDOW_HEIGHT / 2.0f - ship.y * zoom);
+					display_width / 2.0f - ship.x * zoom,
+					display_height / 2.0f - ship.y * zoom);
 			al_use_transform(&transform);
 
-			starfield_draw(ship.x, ship.y, zoom);
+			starfield_draw(ship.x, ship.y, zoom, display_width, display_height);
 			ship_draw(&ship);
 
 			al_identity_transform(&transform);
@@ -196,7 +205,7 @@ int main() {
 						ship.velX * FPS, ship.velY * FPS);
 				al_draw_multiline_text(font,
 						al_map_rgb(0xFF, 0xFF, 0xFF),
-						5, 5, WINDOW_WIDTH, 10.0f,
+						5, 5, (int)display_width, 10.0f,
 						ALLEGRO_ALIGN_LEFT,
 						info);
 			}
@@ -205,8 +214,8 @@ int main() {
 			{
 				al_draw_multiline_text(font,
 						al_map_rgb(0xFF, 0xFF, 0xFF),
-						(float)WINDOW_WIDTH / 2, (float)WINDOW_HEIGHT / 2 - 50,
-						WINDOW_WIDTH, 10.0f,
+						display_width / 2, display_height / 2 - 50,
+						(int)display_width, 10.0f,
 						ALLEGRO_ALIGN_CENTRE,
 						help);
 			}
diff --git a/src/starfield.c b/src/starfield.c
index 4d99269..70c0acf 100644
--- a/src/starfield.c
+++ b/src/starfield.c
@@ -51,9 +51,9 @@ static void generate_chunk_stars(int chunk_x, int chunk_y) {
 	}
 }
 
-void starfield_draw(float camera_x, float camera_y, float zoom) {
-	float view_width = WINDOW_WIDTH / zoom;
-	float view_height = WINDOW_HEIGHT / zoom;
+void starfield_draw(float camera_x, float camera_y, float zoom, float width, float height) {
+	float view_width = width / zoom;
+	float view_height = height / zoom;
 
 	float left = camera_x - view_width / 2.0f;
 	float right = camera_x + view_width / 2.0f;
diff --git a/src/starfield.h b/src/starfield.h
index 1ba6a2e..70bfec8 100644
--- a/src/starfield.h
+++ b/src/starfield.h
@@ -24,5 +24,7 @@
  * @param camera_x The x position of the camera center.
  * @param camera_y The y position of the camera center.
  * @param zoom The zoom level (scale factor).
+ * @param width The display width in pixels.
+ * @param height The display height in pixels.
  */
-void starfield_draw(float camera_x, float camera_y, float zoom);
+void starfield_draw(float camera_x, float camera_y, float zoom, float width, float height);