5 files changed, 49 insertions, 7 deletions

diff --git a/src/common.hpp b/src/common.hpp
index 6aa88d7..bb425e9 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -321,6 +321,7 @@ namespace render {
 	class state_t {
 		sf::RenderWindow *window;
 
+		void render_water(world::world_t *world, rectf_t rect, double time);
 		void render_tile(world::world_t *world, v2f_t tx, world::tile_t *tile);
 		void render_layer(world::world_t *world, rect_t<world::coord_t, 2> &sectors, std::list<world::entity_t*> &ents, layer_t layer);
 		void drender_text(rectf_t rect, std::string str);
@@ -337,7 +338,7 @@ namespace render {
 		void begin_frame(ntime_t time_, double dt);
 		void end_frame(void);
 
-		void render(world::world_t *world);
+		void render(world::world_t *world, double time);
 		void render(double phase, animated_texture_t *anim, rectf_t bounds, sf::Color color = sf::Color::White, bool mirror = false);
 		void render(double phase, oriented_sprite_t *sprite, rectf_t bounds, float angle);
 
@@ -392,6 +393,7 @@ namespace game {
 		void stop(void);
 		void tick(ntime_t time, double dt);
 		world::world_t *get_world(void);
+		double get_render_time(void);
 		void render_interface_to(render::state_t *render);
 	};
 
diff --git a/src/game/game.hpp b/src/game/game.hpp
index 3e5042c..31eb164 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -163,12 +163,11 @@ namespace game {
 	};
 
 	enum {
-		TILE_NONE,
+		TILE_WATER = 0, // special value
 		TILE_DIRT,
 		TILE_DIRT_RED,
 		TILE_STONE,
 		TILE_STONE_RED,
-		TILE_WATER,
 		TILE_GRAVEL
 	};
 
diff --git a/src/game/pseudostate.cpp b/src/game/pseudostate.cpp
index 5b64b9e..969b979 100644
--- a/src/game/pseudostate.cpp
+++ b/src/game/pseudostate.cpp
@@ -53,6 +53,11 @@ world::world_t *pseudostate_t::get_world(void)
 	return &pimpl->world;
 }
 
+double pseudostate_t::get_render_time(void)
+{
+	return pimpl->now;
+}
+
 void pseudostate_t::render_interface_to(render::state_t *render)
 {
 	pimpl->interface.render_to(render);
diff --git a/src/main.cpp b/src/main.cpp
index c7a6f77..c4388b1 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -123,9 +123,8 @@ int main()
 
 		sys_get_rss();
 
-		window.clear();
 		render.begin_frame(now, dt);
-		render.render(game.get_world());
+		render.render(game.get_world(), game.get_render_time());
 		game.render_interface_to(&render);
 		render.end_frame();
 	}
diff --git a/src/render.cpp b/src/render.cpp
index 57c1185..54fbe58 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -68,7 +68,6 @@ void state_t::begin_frame(ntime_t time_, double dt_)
 {
 	time = time_;
 	dt = dt_;
-	window->clear();
 
 	stats.sectors = 0;
 	stats.tiles = 0;
@@ -141,6 +140,9 @@ void state_t::render_tile(world::world_t *world, v2f_t tx, world::tile_t *tile)
 	sf::Vertex verts[8];
 	tiledata_t *data;
 
+	if (tile->type == 0)
+		return;
+
 	data = tiledata + tile->type;
 
 	generate_tile_verts(verts, tx, &world->perlin);
@@ -216,6 +218,38 @@ bool visibility_order(const world::entity_t *x, const world::entity_t *y)
 		return x->render_bounds[1][1] > y->render_bounds[1][1];
 }
 
+void state_t::render_water(world::world_t *world, rectf_t rect, double time)
+{
+	sf::Vertex quad[4];
+	sf::RenderStates states;
+
+	quad[0].position = rect[0];
+	quad[1].position = v2f_t(rect[1][0], rect[0][1]);
+	quad[2].position = rect[1];
+	quad[3].position = v2f_t(rect[0][0], rect[1][1]);
+
+	states.texture = tiledata[0].top;
+
+	for (size_t i = 0; i < 3; i++) {
+		states.blendMode = (i == 0 ? sf::BlendAlpha : sf::BlendAdd);
+
+		for (size_t j = 0; j < 4; j++) {
+			float mul;
+			v2f_t delta;
+
+			mul = powf(2.0f, i + 4);
+			delta[0] = world->perlin.get(v2f_t(time, time), mul);
+			delta[1] = world->perlin.get(v2f_t(time, -time), mul);
+			delta *= 20.0f;
+
+			quad[j].texCoords = (quad[j].position + delta) * mul;
+			quad[j].texCoords.y *= 2.0f;
+		}
+
+		window->draw(quad, 4, sf::Quads, states);
+	}
+}
+
 void state_t::render_layer(world::world_t *world, rect_t<world::coord_t, 2> &sectors,
                            std::list<world::entity_t*> &ents, layer_t layer)
 {
@@ -259,7 +293,7 @@ void state_t::render_layer(world::world_t *world, rect_t<world::coord_t, 2> &sec
 	}
 }
 
-void state_t::render(world::world_t *world)
+void state_t::render(world::world_t *world, double time)
 {
 	const v2f_t margin = {1.5f, 1.5f};
 	rectf_t bounds;
@@ -272,6 +306,9 @@ void state_t::render(world::world_t *world)
 	sectors[0] = world::sector_index_at(bounds[0]);
 	sectors[1] = world::sector_index_at(bounds[1]);
 
+	// Draw the water _with_ the margin to avoid seams at the screen's edges.
+	render_water(world, bounds, time);
+
 	ents = world->get_render_entities(bounds);
 	ents.sort(rendering_order);