package mdesl.test.shadertut;
import static org.lwjgl.opengl.GL11.glClearColor;
import static org.lwjgl.opengl.GL13.GL_TEXTURE0;
import static org.lwjgl.opengl.GL13.GL_TEXTURE1;
import static org.lwjgl.opengl.GL13.GL_TEXTURE2;
import static org.lwjgl.opengl.GL13.glActiveTexture;
import java.io.IOException;
import mdesl.graphics.SpriteBatch;
import mdesl.graphics.Texture;
import mdesl.graphics.glutils.ShaderProgram;
import mdesl.test.Game;
import mdesl.test.SimpleGame;
import mdesl.test.Util;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
public class ShaderLesson4 extends SimpleGame {
public static void main(String[] args) throws LWJGLException {
Game game = new ShaderLesson4();
game.setDisplayMode(640, 480, false);
game.start();
}
//our grass texture
Texture tex0;
//our dirt texture
Texture tex1;
//our mask texture
Texture mask;
//our sprite batch
SpriteBatch batch;
//our program
ShaderProgram program;
protected void create() throws LWJGLException {
super.create();
try {
tex0 = new Texture(Util.getResource("res/grass.png"), Texture.LINEAR, Texture.REPEAT);
tex1 = new Texture(Util.getResource("res/dirt.png"), Texture.LINEAR, Texture.REPEAT);
mask = new Texture(Util.getResource("res/mask.png"), Texture.LINEAR, Texture.REPEAT);
} catch (IOException e) {
throw new RuntimeException("couldn't decode textures");
}
//load our shader program and sprite batch
try {
final String VERTEX = Util.readFile(Util.getResourceAsStream("res/shadertut/lesson4.vert"));
final String FRAGMENT = Util.readFile(Util.getResourceAsStream("res/shadertut/lesson4.frag"));
//create our shader program -- be sure to pass SpriteBatch's default attributes!
program = new ShaderProgram(VERTEX, FRAGMENT, SpriteBatch.ATTRIBUTES);
//Good idea to log any warnings if they exist
if (program.getLog().length()!=0)
System.out.println(program.getLog());
//bind our program
program.use();
//set our sampler2D uniforms
program.setUniformi("u_texture1", 1);
program.setUniformi("u_mask", 2);
//create our sprite batch
batch = new SpriteBatch(program);
} catch (Exception e) {
//simple exception handling...
e.printStackTrace();
System.exit(0);
}
//make GL_TEXTURE2 the active texture unit, then bind our mask texture
glActiveTexture(GL_TEXTURE2);
mask.bind();
//do the same for our other two texture units
glActiveTexture(GL_TEXTURE1);
tex1.bind();
glActiveTexture(GL_TEXTURE0);
tex0.bind();
//gray clear colour
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
}
protected void render() throws LWJGLException {
super.render();
batch.begin();
batch.draw(tex0, 10, 10);
batch.end();
}
// called to resize the display
protected void resize() throws LWJGLException {
super.resize();
// resize our batch with the new screen size
batch.resize(Display.getWidth(), Display.getHeight());
}
}