From a62ac36a7e401b39d760237778623f5a2b13f91f Mon Sep 17 00:00:00 2001
From: Paweł Redman <pawel.redman@gmail.com>
Date: Sat, 16 Dec 2017 15:32:44 +0100
Subject: Distort the tile grid when rendering.

---
 src/common.hpp |  2 ++
 src/math.hpp   |  5 +++++
 src/render.cpp | 40 +++++++++++++++++++++++++++++++++-------
 3 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/src/common.hpp b/src/common.hpp
index 7b784bf..1ae3595 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -311,6 +311,8 @@ namespace render {
 
 	class state_t {
 		sf::RenderWindow *window;
+		procgen::prng_t prng;
+		procgen::perlin_noise_t perlin;
 
 		void render_sector(world::sector_t *sector);
 		void drender_text(rectf_t rect, std::string str);
diff --git a/src/math.hpp b/src/math.hpp
index 13eb36a..5e117fd 100644
--- a/src/math.hpp
+++ b/src/math.hpp
@@ -216,6 +216,11 @@ public:
 		return r;
 	}
 
+	vec_t<T, N> wrap(void)
+	{
+		return *this - this->floor();
+	}
+
 	T len(void)
 	{
 		return std::sqrt(*this * *this);
diff --git a/src/render.cpp b/src/render.cpp
index f773f92..2e8447b 100644
--- a/src/render.cpp
+++ b/src/render.cpp
@@ -10,6 +10,9 @@ state_t::state_t(sf::RenderWindow *window_)
 	window = window_;
 
 	font.loadFromFile("assets/FanwoodText.otf");
+
+	prng.seed(396);
+	perlin.generate(&prng, 16);
 }
 
 // FIXME: rename
@@ -20,6 +23,7 @@ void register_tile(uint8_t type, const char *path)
 	printf("load %s\n", path);
 	tiles[type] = new sf::Texture;
 	tiles[type]->loadFromFile(path);
+	tiles[type]->setRepeated(true);
 }
 
 void state_t::begin_frame(double now_, double dt_)
@@ -70,10 +74,32 @@ void state_t::drender_entity(world::entity_t *ent)
 	drender_text(ent->render_bounds, ss.str());
 }
 
+static const v2f_t tile_base[8] ={
+	{1.0f, 0.5f}, {1.0f, 1.0f}, {0.5f, 1.0f}, {0.0f, 1.0f},
+	{0.0f, 0.5f}, {0.0f, 0.0f}, {0.5f, 0.0f}, {1.0f, 0.0f}
+};
+
+static void generate_tile_verts(sf::Vertex *verts, v2f_t tx, procgen::perlin_noise_t *perlin)
+{
+	for (size_t i = 0; i < 8; i++) {
+		v2f_t base, turb;
+
+		base = tile_base[i] + tx;
+
+		turb[0] = perlin->get(base, 1.0f) * 0.5f;
+		turb[1] = perlin->get(base, 2.0f) * 0.5f;
+
+		verts[i].position = base + turb;
+		verts[i].texCoords = (base + turb) * 32.0f;
+		verts[i].color = sf::Color::White;
+	}
+}
+
 void state_t::render_sector(world::sector_t *sector)
 {
 	for (ssize_t y = 0; y < SECTOR_SIZE; y++)
 	for (ssize_t x = 0; x < SECTOR_SIZE; x++) {
+		sf::Vertex verts[8];
 		sf::Texture *texture;
 		v2f_t tx;
 		world::tile_t *tile;
@@ -87,13 +113,9 @@ void state_t::render_sector(world::sector_t *sector)
 			abort();
 		}
 
-		wot_rect.setTexture(texture, true);
-		wot_rect.setSize(sf::Vector2f(1.0f, 1.0f));
-		wot_rect.setPosition(tx);
-		wot_rect.setFillColor(sf::Color::White);
-		wot_rect.setOutlineColor(sf::Color::Transparent);
-		window->draw(wot_rect);
-		wot_rect.setTexture(NULL);
+		sf::RenderStates states(texture);
+		generate_tile_verts(verts, tx, &perlin);
+		window->draw(verts, 8, sf::TrianglesFan, states);
 
 		if (debug_draw_tile_coords) {
 			world::tile_index_t local(x, y);
@@ -116,6 +138,7 @@ void state_t::render(game::state_t *game)
 {
 	sf::Vector2u size = window->getSize();
 	v2f_t A, B, C, D;
+	const v2f_t margin(1.0f, 1.0f);
 	rectf_t bbox;
 	std::list<world::entity_t*> ents;
 
@@ -129,6 +152,9 @@ void state_t::render(game::state_t *game)
 	bbox[1][0] = std::max({A[0], B[0], C[0], D[0]});
 	bbox[1][1] = std::max({A[1], B[1], C[1], D[1]});
 
+	bbox[0] -= margin;
+	bbox[1] += margin;
+
 	for (world::sector_t *sector : game->world.get_sectors(bbox))
 		render_sector(sector);
 
-- 
cgit