Added initial engine

src/com/gnarly/game/Button.java

@@ -0,0 +1,85 @@
+package com.gnarly.game;
+
+import static org.lwjgl.glfw.GLFW.GLFW_MOUSE_BUTTON_1;
+
+import org.joml.Vector3f;
+
+import com.gnarly.engine.display.Camera;
+import com.gnarly.engine.display.Window;
+import com.gnarly.engine.model.TexRect;
+
+public class Button {
+
+	public static final int
+		UNPRESSED = 0,
+		RELEASED  = 1,
+		PRESSED   = 2,
+		HELD      = 3;
+	
+	private Window window;
+	private Camera camera;
+	
+	private TexRect[] states;
+	
+	private float x, y, width, height;
+	
+	private int state, tex;
+	
+	public Button(Window window, Camera camera, String tex1, String tex2, String tex3, float x, float y, float depth, float width, float height, boolean gui) {
+		this.window = window;
+		this.camera = camera;
+		this.x = x;
+		this.y = y;
+		this.width = width;
+		this.height = height;
+		states = new TexRect[3];
+		states[0] = new TexRect(camera, tex1, x, y, depth, width, height, 0, gui);
+		states[1] = new TexRect(camera, tex2, x, y, depth, width, height, 0, gui);
+		states[2] = new TexRect(camera, tex3, x, y, depth, width, height, 0, gui);
+		tex = 0;
+		state = 0;
+	}
+	
+	public void update() {
+		if(contains(window.getMouseCoords(camera))) {
+			if(window.mousePressed(GLFW_MOUSE_BUTTON_1) > Window.BUTTON_UNPRESSED) {
+				tex = 2;
+				if(state <= RELEASED)
+					state = PRESSED;
+				else
+					state = HELD;
+			}
+			else {
+				tex = 1;
+				if(state >= PRESSED)
+					state = RELEASED;
+				else
+					state = UNPRESSED;
+			}
+		}
+		else {
+			tex = 0;
+			state = UNPRESSED;
+		}
+	}
+	
+	public void render() {
+		states[tex].render();
+	}
+	
+	public boolean contains(Vector3f coords) {
+		return coords.x >= x && coords.y >= y && coords.x < x + width && coords.y < y + height;
+	}
+	
+	public int getState() {
+		return state;
+	}
+	
+	public void setTex(int tex) {
+		this.tex = tex;
+	}
+	
+	public float getHeight() {
+		return states[0].getHeight();
+	}
+}