1 files changed, 49 insertions, 1 deletions
diff --git a/src/game/game.cpp b/src/game/game.cpp
index 44ea95d..58b2c9d 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -194,7 +194,6 @@ void state_t::resume(void)
 	paused = false;
 }
 
-
 #define TIME_DELTA ((ntime_t)1000000000 / 60)
 
 void state_t::tick(ntime_t time_)
@@ -234,6 +233,55 @@ void state_t::tick(ntime_t time_)
 	}
 }
 
+void state_t::compute_ambience(render::state_t *render)
+{
+	rectf_t area;
+	size_t plains = 0, cave = 0, water = 0, weird = 0;
+	float scale, volume;
+
+	area = render->window_in_world_space();
+
+	// resolution chosen arbitrarily
+	for (size_t y = 0; y < 5; y++)
+	for (size_t x = 0; x < 5; x++) {
+		v2f_t point;
+		world::tile_t *tile;
+
+		point[0] = lerp(area[0][0], area[1][0], y / 4.0f);
+		point[1] = lerp(area[0][1], area[1][1], x / 4.0f);
+
+		tile = world.get_tile(world::tile_index_t(point), world::SECTOR_FULL);
+
+		switch (tile->type) {
+		case TILE_DIRT:
+			plains++;
+			break;
+
+		case TILE_GRAVEL:
+		case TILE_STONE:
+			cave++;
+			break;
+
+		case TILE_WATER:
+			water++;
+			break;
+
+		case TILE_DIRT_RED:
+		case TILE_STONE_RED:
+			weird++;
+			break;
+		}
+	}
+
+	scale = 1.0f / area.dims().len();
+	volume = clamp(remap(0.002f, 0.08f, 0.0f, 1.0f, scale), 0.0f, 1.0f);
+
+	assets::ambience.wind.weight = plains / 25.0f * volume;
+	assets::ambience.chasm.weight = cave / 25.0f * volume;
+	assets::ambience.water.weight = water / 25.0f * volume;
+	assets::ambience.nexus.weight = weird / 25.0f * volume;
+}
+
 die_t::die_t(size_t sides_)
 {
 	sides = sides_;