5 files changed, 48 insertions, 0 deletions
diff --git a/src/game/game.cpp b/src/game/game.cpp
index 883df60..246a222 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -503,6 +503,36 @@ void state_t::resume(void)
 	paused = false;
 }
 
+void state_t::check_game_over(void)
+{
+	if (game_over_displayed)
+		return;
+
+	if (!first_teleporter_placed)
+		return;
+
+	// Can collect crystals and got a teleporter.
+	if (num_scientists && num_teleporters)
+		return;
+
+	// Got a teleporter and enough crystals for a scientist.
+	if (num_teleporters && crystals >= 95)
+		return;
+
+	// Got a scientist, a builder and enough crystals for a teleporter.
+	if (num_scientists && num_builders && crystals >= 265)
+		return;
+
+	// Got a builder and enough crystals for a teleporter and a scientist.
+	if (num_builders && crystals >= 265 + 95)
+		return;
+
+	interface.print("FURTHER PROGRESS IS NOT POSSIBLE.");
+	interface.print("At this point you might want to restart the game.");
+
+	game_over_displayed = true;
+}
+
 #define TIME_DELTA ((ntime_t)1000000000 / 100)
 #define TIME_LIMIT ((ntime_t)1000000000 / 20)
 
@@ -536,6 +566,8 @@ void state_t::tick(ntime_t time_)
 			if (awake_entities.find(ent) != awake_entities.end())
 				ent->on_think();
 
+		check_game_over();
+
 		frames++;
 		frames_since_t0++;
 		time += TIME_DELTA;
diff --git a/src/game/game.hpp b/src/game/game.hpp
index 31eb164..b6cb597 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -142,6 +142,13 @@ namespace game {
 		bool first_teleporter_placed = false;
 		size_t crystals = 150;
 
+		size_t num_scientists = 0;
+		size_t num_builders = 0;
+		size_t num_teleporters = 0;
+		bool game_over_displayed = false;
+		void check_game_over(void);
+
+
 		void command_first_teleporter(v2f_t where);
 
 		void wake_area(v2f_t x);
diff --git a/src/game/unit_builder.cpp b/src/game/unit_builder.cpp
index 801639e..231101a 100644
--- a/src/game/unit_builder.cpp
+++ b/src/game/unit_builder.cpp
@@ -49,6 +49,8 @@ unit_builder_t::unit_builder_t(game::state_t *game) : unit_t(game, UNIT_BUILDER)
 	controllable = true;
 
 	health = max_health = 45;
+
+	game->num_builders++;
 }
 
 void unit_builder_t::command_stop(void)
@@ -247,6 +249,7 @@ void unit_builder_t::on_death(void)
 	place(world, x);
 	controllable = false;
 	move_marker.reset();
+	game->num_builders--;
 }
 
 void unit_builder_t::render_to(render::state_t *render)
diff --git a/src/game/unit_scientist.cpp b/src/game/unit_scientist.cpp
index 537539e..e1f8ece 100644
--- a/src/game/unit_scientist.cpp
+++ b/src/game/unit_scientist.cpp
@@ -49,6 +49,8 @@ unit_scientist_t::unit_scientist_t(game::state_t *game) : unit_t(game, UNIT_SCIE
 	controllable = true;
 
 	health = max_health = 15;
+
+	game->num_scientists++;
 }
 
 static std::string russian_plural(size_t count, const char *nom_sg, const char *gen_sg,
@@ -142,6 +144,7 @@ void unit_scientist_t::on_death(void)
 	cmodel.ignore = true;
 	game->deletion_list.insert(this);
 	game->explosion(x);
+	game->num_scientists--;
 }
 
 void unit_scientist_t::render_to(render::state_t *render)
diff --git a/src/game/unit_teleporter.cpp b/src/game/unit_teleporter.cpp
index fd73ab6..56b3b5a 100644
--- a/src/game/unit_teleporter.cpp
+++ b/src/game/unit_teleporter.cpp
@@ -35,6 +35,8 @@ unit_teleporter_t::unit_teleporter_t(game::state_t *game_) : unit_t(game_, UNIT_
 	friendly = true;
 	controllable = true;
 	constructed = false;
+
+	game->num_teleporters++;
 }
 
 void unit_teleporter_t::on_damage(unit_t *attacker)
@@ -46,6 +48,7 @@ void unit_teleporter_t::on_death(void)
 {
 	game->explosion(x);
 	game->deletion_list.insert(this);
+	game->num_teleporters--;
 }
 
 void unit_teleporter_t::render_to(render::state_t *render)