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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.tests.g3d.voxel;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.PerspectiveCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.graphics.g3d.Environment;
import com.badlogic.gdx.graphics.g3d.ModelBatch;
import com.badlogic.gdx.graphics.g3d.attributes.ColorAttribute;
import com.badlogic.gdx.graphics.g3d.environment.DirectionalLight;
import com.badlogic.gdx.graphics.g3d.shaders.DefaultShader;
import com.badlogic.gdx.graphics.g3d.utils.FirstPersonCameraController;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.tests.utils.GdxTest;
import com.badlogic.gdx.utils.ScreenUtils;

public class VoxelTest extends GdxTest {
	SpriteBatch spriteBatch;
	BitmapFont font;
	ModelBatch modelBatch;
	PerspectiveCamera camera;
	Environment lights;
	FirstPersonCameraController controller;
	VoxelWorld voxelWorld;

	@Override
	public void create () {
		spriteBatch = new SpriteBatch();
		font = new BitmapFont();
		modelBatch = new ModelBatch();
		DefaultShader.defaultCullFace = GL20.GL_FRONT;
		camera = new PerspectiveCamera(67, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
		camera.near = 0.5f;
		camera.far = 1000;
		controller = new FirstPersonCameraController(camera);
		Gdx.input.setInputProcessor(controller);

		lights = new Environment();
		lights.set(new ColorAttribute(ColorAttribute.AmbientLight, 0.4f, 0.4f, 0.4f, 1.f));
		lights.add(new DirectionalLight().set(1, 1, 1, 0, -1, 0));

		Texture texture = new Texture(Gdx.files.internal("data/g3d/tiles.png"));
		TextureRegion[][] tiles = TextureRegion.split(texture, 32, 32);

		MathUtils.random.setSeed(0);
		voxelWorld = new VoxelWorld(tiles[0], 20, 4, 20);
		PerlinNoiseGenerator.generateVoxels(voxelWorld, 0, 63, 10);
		float camX = voxelWorld.voxelsX / 2f;
		float camZ = voxelWorld.voxelsZ / 2f;
		float camY = voxelWorld.getHighest(camX, camZ) + 1.5f;
		camera.position.set(camX, camY, camZ);
	}

	@Override
	public void render () {
		ScreenUtils.clear(0.4f, 0.4f, 0.4f, 1f, true);
		modelBatch.begin(camera);
		modelBatch.render(voxelWorld, lights);
		modelBatch.end();
		controller.update();

		spriteBatch.begin();
		font.draw(spriteBatch, "fps: " + Gdx.graphics.getFramesPerSecond() + ", #visible chunks: " + voxelWorld.renderedChunks
			+ "/" + voxelWorld.numChunks, 0, 20);
		spriteBatch.end();
	}

	@Override
	public void resize (int width, int height) {
		spriteBatch.getProjectionMatrix().setToOrtho2D(0, 0, width, height);
		camera.viewportWidth = width;
		camera.viewportHeight = height;
		camera.update();
	}
}