From b64aa31b4dc0c5e050c4978bae7bd43a040a368b Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <tullivan99@gmail.com>
Date: Sat, 21 Oct 2017 19:56:48 -0400
Subject: lua scriptable world gen

---
 include/systems/light.hpp |  3 +++
 include/world.hpp         |  1 +
 src/world.cpp             | 39 ++++++++++++++++++++++++++++++++++++++-
 xml/!town.xml             | 25 ++++++++++++++++++++++++-
 xml/wavy.xml              | 28 ++++++++++++++++++++++++++++
 5 files changed, 94 insertions(+), 2 deletions(-)
 create mode 100644 xml/wavy.xml

diff --git a/include/systems/light.hpp b/include/systems/light.hpp
index 71c541a..ba91113 100644
--- a/include/systems/light.hpp
+++ b/include/systems/light.hpp
@@ -29,6 +29,9 @@ public:
 	static int addLight(vec2 pos, float radius, Color color = Color(1, 1, 1));
 	static void updateLight(int index, vec2 pos, float radius = -1);
 	static void removeLight(int index);
+
+	static inline void clear(void)
+	{ lights.clear(); }
 };
 
 #endif // SYSTEM_LIGHT_HPP_
diff --git a/include/world.hpp b/include/world.hpp
index 059efa3..991990e 100644
--- a/include/world.hpp
+++ b/include/world.hpp
@@ -159,6 +159,7 @@ public:
 	static void goWorldRight(Position& p, Solid &d);
 	static void goWorldPortal(Position& p);
 
+	static void generate(LuaScript& script);
 	static void generate(int width = 0);
 
 	static bool save(void);
diff --git a/src/world.cpp b/src/world.cpp
index ea2566a..f55b39d 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -27,6 +27,7 @@ using namespace tinyxml2;
 #include <ui.hpp>
 #include <vector3.hpp>
 #include <weather.hpp>
+#include <systems/lua.hpp>
 
 WorldData2        WorldSystem::world;
 Mix_Music*        WorldSystem::bgmObj;
@@ -68,6 +69,34 @@ int WorldSystem::getLineIndex(float x)
 		0, static_cast<int>(world.data.size()));
 }
 
+void WorldSystem::generate(LuaScript& script)
+{
+	int i = 0;
+	world.data.clear();
+	do {
+		float h, g[2];
+		script("ground", {LuaVariable("height", h)});
+		if (h == -1.0f)
+			break;
+		script("grass", {LuaVariable("height", g[0])});
+		script("grass", {LuaVariable("height", g[1])});
+		world.data.push_back(WorldData {true, {g[0], g[1]}, h,
+			static_cast<unsigned char>(randGet() % 32 / 8)});
+	} while (++i);
+
+	// define x-coordinate of world's leftmost 'line'
+	world.startX = HLINES(i * -0.5);
+
+	// gen. star coordinates
+	if (stars.empty()) {
+		stars.resize(game::SCREEN_WIDTH / 30);
+		for (auto& s : stars) {
+			s.x = world.startX + (randGet() % (int)HLINES(i));
+			s.y = game::SCREEN_HEIGHT - (randGet() % (int)HLINES(game::SCREEN_HEIGHT / 1.3f));
+		}
+	}
+}
+
 void WorldSystem::generate(int width)
 {
 	float geninc = 0;
@@ -191,6 +220,8 @@ void WorldSystem::loader(void)
 	if (!currentXMLFile.empty())
 		save();
 
+	LightSystem::clear();
+
 	// load file data to string
 	auto xmlPath = game::config::xmlFolder + toLoad;
 	auto xmlRaw = readFile(xmlPath);
@@ -277,7 +308,13 @@ void WorldSystem::loader(void)
 
 		// world generation
 		 else if (tagName == "generation") {
-			generate(wxml->IntAttribute("width"));
+			auto text = wxml->GetText();
+			if (text == nullptr)
+				generate(wxml->IntAttribute("width"));
+			else {
+				LuaScript script (text);
+				generate(script);
+			}
 		}
 
 		// indoor stuff
diff --git a/xml/!town.xml b/xml/!town.xml
index 29673b0..26a62a1 100644
--- a/xml/!town.xml
+++ b/xml/!town.xml
@@ -12,7 +12,30 @@
 		<layer path="bg/dirt.png"/>
 		<layer path="bg/grass.png"/>
 	</style>
-	<generation width="320"/>
+	<generation>
+		x = 0
+
+		ground = function()
+			if (x == 330) then
+				height = -1
+			else
+				if (x &lt; 10) then
+					height = 800
+				else
+					if (x &lt; 30) then
+						height = -100 * math.tan(0.08 * (x - 10) + 1.77) + 75
+					else
+						height = 60
+					end
+				end
+			end
+			x = x + 1
+		end
+
+		grass = function()
+			height = math.random(2, 7)
+		end
+	</generation>
 	<weather>Sunny</weather>
 	<link right="!town2.xml"/>
 	<spawnx>-300</spawnx>
diff --git a/xml/wavy.xml b/xml/wavy.xml
new file mode 100644
index 0000000..3f0c187
--- /dev/null
+++ b/xml/wavy.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0"?>
+
+<World>
+	<style bgm="assets/music/town.ogg" folder="assets/style/winter/">
+		<layer path="bg/bg.png"/>
+		<layer path="bg/bgFarMountain.png"/>
+		<layer path="bg/dirt.png"/>
+		<layer path="bg/grass.png"/>
+	</style>
+	<generation>
+		x = 0
+		ground = function()
+			if (x == 600) then
+				height = -1
+			else
+				height = math.sin(x * 3.14 / 90) * 50 + 60
+			end
+			x = x + 1
+		end
+
+		grass = function()
+			height = math.random(2, 4)
+		end
+	</generation>
+	<weather>Rainy</weather>
+	<time>10000</time>
+</World>
+
-- 
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