Add a starfield in the background.

This should help to better visualize the velocity of the ship.

CMakeLists.txt

@@ -44,7 +44,8 @@ include_directories(
 set(SRCS
 	src/event_manager.c
 	src/main.c
-	src/ship.c)
+	src/ship.c
+	src/starfield.c)
 
 add_definitions(-DVERSION="${TARGET_VERSION}")
 

src/main.c

@@ -19,6 +19,7 @@
 #include "globals.h"
 #include "event_manager.h"
 #include "ship.h"
+#include "starfield.h"
 
 int run;
 int redraw;
@@ -179,6 +180,7 @@ int main() {
 					WINDOW_HEIGHT / 2.0f - ship.y * zoom);
 			al_use_transform(&transform);
 
+			starfield_draw(ship.x, ship.y, zoom);
 			ship_draw(&ship);
 
 			al_identity_transform(&transform);

src/starfield.c

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2026  Ortega Froysa, Nicolás <nicolas@ortegas.org>
+ * Author: Ortega Froysa, Nicolás <nicolas@ortegas.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "starfield.h"
+#include "globals.h"
+
+#include <stdlib.h>
+#include <math.h>
+#include <allegro5/allegro.h>
+#include <allegro5/allegro_primitives.h>
+
+#define CHUNK_SIZE 256
+#define STARS_PER_CHUNK 50
+#define STAR_COLOR al_map_rgb(255, 255, 255)
+
+static unsigned int hash_seed(int chunk_x, int chunk_y) {
+	unsigned int h = 5381;
+	h = ((h << 5) + h) ^ chunk_x;
+	h = ((h << 5) + h) ^ chunk_y;
+	return h;
+}
+
+static void generate_chunk_stars(int chunk_x, int chunk_y) {
+	unsigned int seed = hash_seed(chunk_x, chunk_y);
+	srand(seed);
+
+	float base_x = chunk_x * CHUNK_SIZE;
+	float base_y = chunk_y * CHUNK_SIZE;
+
+	for(int i = 0; i < STARS_PER_CHUNK; ++i)
+	{
+		float star_x = base_x + (float)(rand() % CHUNK_SIZE);
+		float star_y = base_y + (float)(rand() % CHUNK_SIZE);
+
+		al_draw_pixel(star_x, star_y, STAR_COLOR);
+	}
+}
+
+void starfield_draw(float camera_x, float camera_y, float zoom) {
+	float view_width = WINDOW_WIDTH / zoom;
+	float view_height = WINDOW_HEIGHT / zoom;
+
+	float left = camera_x - view_width / 2.0f;
+	float right = camera_x + view_width / 2.0f;
+	float top = camera_y - view_height / 2.0f;
+	float bottom = camera_y + view_height / 2.0f;
+
+	int chunk_left = (int)floor(left / CHUNK_SIZE);
+	int chunk_right = (int)floor(right / CHUNK_SIZE);
+	int chunk_top = (int)floor(top / CHUNK_SIZE);
+	int chunk_bottom = (int)floor(bottom / CHUNK_SIZE);
+
+	for(int cy = chunk_top; cy <= chunk_bottom; ++cy)
+	{
+		for(int cx = chunk_left; cx <= chunk_right; ++cx)
+		{
+			generate_chunk_stars(cx, cy);
+		}
+	}
+}

src/starfield.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2026  Ortega Froysa, Nicolás <nicolas@ortegas.org>
+ * Author: Ortega Froysa, Nicolás <nicolas@ortegas.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/**
+ * @brief Draw stars in the visible area of the starfield.
+ *
+ * @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).
+ */
+void starfield_draw(float camera_x, float camera_y, float zoom);