4 files changed, 76 insertions, 6 deletions
diff --git a/src/main/engine/engine.c b/src/main/engine/engine.c
index d7e0f9c..b4b9f42 100644
--- a/src/main/engine/engine.c
+++ b/src/main/engine/engine.c
@@ -17,18 +17,33 @@
  * along with Tris Game.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <GL/gl.h>
 #include "../ui/ui.h"
 
 #define RANGE_GL 2.0f
 
-float xstep;
-float ystep;
+static float xstep;
+static float ystep;
+static int width;
+static int height;
 
 void
-engine_init(int width, int height)
+engine_init(int w, int h)
 {
-	ui_init(width, height);
+	width = w;
+	height = h;
+	ui_init(w, h);
 
-	xstep = RANGE_GL / (float) width;
-	ystep = RANGE_GL / (float) height;
+	xstep = RANGE_GL / (float) w;
+	ystep = RANGE_GL / (float) h;
+}
+
+void
+engine_draw_line(int x1, int y1, int x2, int y2)
+{
+	float _x1 = x1 * xstep - 1; float _y1 = (height - y1) * ystep - 1;
+	float _x2 = x2 * xstep - 1; float _y2 = (height - y2) * ystep - 1;
+
+	glVertex2f(_x1, _y1);
+	glVertex2f(_x2, _y2);
 }
diff --git a/src/main/engine/engine.h b/src/main/engine/engine.h
index 83b8367..cb9e562 100644
--- a/src/main/engine/engine.h
+++ b/src/main/engine/engine.h
@@ -21,5 +21,6 @@
 #define __ENGINE_H__
 
 void engine_init(int width, int height);
+void engine_draw_line(int x1, int y1, int x2, int y2);
 
 #endif /* __ENGINE_H__ */
diff --git a/src/main/game.c b/src/main/game.c
new file mode 100644
index 0000000..bc9e007
--- /dev/null
+++ b/src/main/game.c
@@ -0,0 +1,29 @@
+/*-
+ * Copyright (C) 2025  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of Tris Game.
+ *
+ * Tris Game 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.
+ *
+ * Tris Game 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 Tris Game.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "engine/engine.h"
+
+void
+game_field(int box_size, int x, int y)
+{
+	engine_draw_line(box_size,     y,            box_size,     box_size * 3);
+	engine_draw_line(box_size * 2, y,            box_size * 2, box_size * 3);
+	engine_draw_line(x,            box_size,     box_size * 3, box_size);
+	engine_draw_line(x,            box_size * 2, box_size * 3, box_size * 2);
+}
diff --git a/src/main/game.h b/src/main/game.h
new file mode 100644
index 0000000..a337bf8
--- /dev/null
+++ b/src/main/game.h
@@ -0,0 +1,25 @@
+/*-
+ * Copyright (C) 2025  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
+ *
+ * This file is part of Tris Game.
+ *
+ * Tris Game 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.
+ *
+ * Tris Game 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 Tris Game.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GAME_H__
+#define __GAME_H__
+
+void game_field(int box_size, int x, int y);
+
+#endif /* __GAME_H__ */