Hi I have a game that was using Lwjgl3Application with 1.9.10, after updating to 1.10.0 the drawing is noticeably worse on my 2014 macbook pro. You can tell the difference even when drawing a single texture. When texture are drawn, it looks like they are drawn in horizontal chunks, giving the illusion that drawing is lagging. The framerate via Gdx.graphics.getFramesPerSecond() is still ~60. On larger scenes, the weirdness in drawing is very apparent as large horizontal bands of artifacts going across the screen.
I used the project generator tool to make a scratch project to try and narrow it down, it looks like the degradation happens between 1.9.10 and 1.9.11.
In comparison, using LwjglApplication works just as well as before.
Below is the code, if running on a mac make sure to add the -XstartOnFirstThread VM arg to the desktop launcher otherwise it won't start.
public class DesktopLauncher {
public static void main (String[] arg) {
final Lwjgl3ApplicationConfiguration config = new Lwjgl3ApplicationConfiguration();
new Lwjgl3Application(new MyGdxGame(), config);
}
}
public class MyGdxGame extends ApplicationAdapter {
SpriteBatch batch;
Texture img;
int posX, posY;
#Override
public void create () {
batch = new SpriteBatch();
img = new Texture("badlogic.jpg");
}
#Override
public void render () {
Gdx.gl.glClearColor(1, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
batch.begin();
batch.draw(img, posX, posY);
batch.end();
// make texture move around a bit
posX++;
posY++;
if (posX >= Gdx.graphics.getWidth() - img.getWidth()) {
posX = 0;
posY = 0;
}
}
#Override
public void dispose () {
batch.dispose();
img.dispose();
}
}
Thanks
I want to have several comets falling in the background of my UI,I have a working comet Actor that does what it is supposed to, but I am not sure how to create a continuous spawn with these comets (with a random delay between each) in a table, without scene2d/actors it would look something like:
cometTimer += delta
if(cometTimer >= interval){
addCometToArray();
cometTimer = 0;
}
With the cometArray being looped over and drawn every frame, and then removing the entity when it goes out of bounds.
The only way I know how to add Actors to a table is like this:
table().add(new DialogComet());
How would I go about adding this type of behaviour using Scene2d?
Not sure if this is what you were looking for, but the below is a small working app that shows comets "falling" from the top to bottom, using Tables and having the tables manage the comets (no separate array/data structure). I created a small Comet class that extends Actor as well, to allow for movement and placement.
"main" class:
import java.util.Iterator;
import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.ui.Table;
public class StageComet implements ApplicationListener {
private static final float INTERVAL = 0.3f;
private Batch batch;
private ShapeRenderer shapeRenderer;
private OrthographicCamera camera;
private BitmapFont font;
private Table rootTable;
private Table cometTable;
private Stage stage;
private Iterator<Actor> iter;
private Comet comet;
private float cometTimer = 0;
private float delta = 0;
#Override
public void create() {
camera = new OrthographicCamera();
camera.setToOrtho(false, 960, 640);
shapeRenderer = new ShapeRenderer();
batch = new SpriteBatch();
font = new BitmapFont();
stage = new Stage();
/*
* The root table could contain main "play" actors. It is empty in this example.
*/
rootTable = new Table();
rootTable.setFillParent(true);
/*
* Usually in Scene2d I think the practice is only to have 1 root table that takes up the entire screen (above),
* but for simplicity/illustrative purposes, I created a cometTable only, set it to Fill Parent as well, and the
* getChildren() of the table will have our array of comets in play at any given time.
*/
cometTable = new Table();
cometTable.setFillParent(true);
stage.addActor(rootTable);
stage.addActor(cometTable);
}
#Override
public void render() {
Gdx.gl.glClearColor(0, 0, 0.2f, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
batch.setProjectionMatrix(camera.combined);
delta = Gdx.app.getGraphics().getDeltaTime();
stage.act(delta); // make sure the comets "fall"
shapeRenderer.begin(ShapeType.Filled); // simple rendering of comets, they are just a circle ...
iter = cometTable.getChildren().iterator(); // Table subclasses Group, which has a snapshot array of its Actors
while ( iter.hasNext() ) {
comet = (Comet)iter.next();
shapeRenderer.circle(comet.getX(), comet.getY(), 20.0f); // Draw the comet
if ( comet.getY() < -100 ) { // Hack/hardcode, if the comet fell far enough "off stage" ...
iter.remove(); // ... remove it from the stage
}
}
shapeRenderer.end();
/*
* Sample code from original question on how to create a comet without scene2d ...
*/
cometTimer += delta;
if ( cometTimer > INTERVAL ) {
cometTable.add(new Comet()); // ... but in this case, we use scene2d
cometTimer = 0;
}
/*
* To keep track, display a simple message of # of comets on stage at any given time.
*/
batch.begin();
font.draw(batch, "Comets on stage: " + cometTable.getChildren().size, 100, 100);
batch.end();
}
/*
* I may have missed disposing something, but you get the idea ...
*/
#Override
public void dispose() {
shapeRenderer.dispose();
batch.dispose();
stage.dispose();
font.dispose();
}
#Override
public void resize(int width, int height) { }
#Override
public void pause() { }
#Override
public void resume() { }
}
And the small Comet class:
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.scenes.scene2d.Actor;
public class Comet extends Actor{
/*
* Spawn a comet at the top of the screen, in the middle
*/
public Comet() {
super();
this.setY(Gdx.app.getGraphics().getHeight());
this.setX(Gdx.app.getGraphics().getWidth()/2.0f);
}
/*
* Let the comet fall (same speed) to the bottom of the screen ...
*/
#Override
public void act (float delta) {
this.setY(this.getY() - 10);
super.act(delta);
}
}
I'm just starting android game development with LibGdx framework.
I read many online tutorial so far and the more I read the more I got confused: ApplicationListener, ApplicationAdapter, Stages, Game, Screens, Actors, Sprites, Images... not mentioning Input and Gesture listeners of all king).
I finally understood what kind of "model" I should use for the game I have in mind (a kind of puzzle game): Game, Screens, Stage and Actor.
So here is my first code.
This is the main application (Game):
package com.my.game1;
import com.badlogic.gdx.Game;
public class MyGame extends Game {
#Override
public void create () {
setScreen(new StarterScreen());
}
}
This is the main screen class:
package com.my.game1;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.scenes.scene2d.Stage;
public class StarterScreen implements Screen {
private Stage stage;
private float screenW, screenH;
private Tess tessera;
#Override
public void show() {
tessera = new Tess("image.png");
stage = new Stage();
screenW = stage.getViewport().getWorldWidth();
screenH = stage.getViewport().getWorldHeight();
Gdx.input.setInputProcessor(stage);
stage.addActor(tessera);
}
#Override
public void render(float delta) {
Gdx.gl.glClearColor(0,0,0,1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
stage.act();
stage.draw();
}
#Override
public void resize(int width, int height) {
// TODO Auto-generated method stub
}
#Override
public void pause() {
// TODO Auto-generated method stub
}
#Override
public void resume() {
// TODO Auto-generated method stub
}
#Override
public void hide() {
dispose();
}
#Override
public void dispose() {
stage.dispose();
}
}
And the following is the class that extends Actor:
package com.my.game1;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.utils.ActorGestureListener;
public class Tess extends Actor {
private Texture texture;
private boolean selected = false;
public Tess (String img) {
this.texture = new Texture(Gdx.files.internal(img));
this.setBounds(0f, 0f, this.texture.getWidth(), this.texture.getHeight());
this.setOrigin(this.texture.getWidth() / 2, this.texture.getHeight() / 2);
this.setScale(0.25f);
this.addListener(new ActorGestureListener() {
public void tap(InputEvent event, float x, float y, int pointer, int button) {
((Tess)event.getTarget()).toggleSelect();
((Tess)event.getTarget()).setColor(0.5f, 0f, 0.5f, 1f);
}
});
}
#Override
public void draw(Batch batch, float alpha){
batch.draw(texture, 0, 0);
}
public void finalize() {
this.texture.dispose();
}
public void toggleSelect(){
this.selected = !this.selected;
if (this.selected == true)
this.setColor(0.5f, 0f, 0.5f, 1f);
else
this.setColor(0f, 0f, 0f, 0f);
}
}
The screen shows correctly the actor, but I cannot set the Actor's position or its scale, nor the "tap" event seems to get detected; and the color doesn't change.
What I did wrong?
Several things were wrong. First, just on the side, you don't want to call dispose() from the Screen's hide() method. hide() can be called simply when the screen is turned off, or when the app is switched to the background, and disposing of the Screen during that would cause serious issues on resume.
With that out of the way, here's what your Actor should have looked like:
package com.my.game1;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.InputListener;
import com.badlogic.gdx.scenes.scene2d.Touchable;
public class Tess extends Actor {
private Sprite sprite;
private boolean selected = false;
public Tess (String img) {
this.sprite = new Sprite(new Texture(Gdx.files.internal(img)));
this.setTouchable(Touchable.enabled);
this.setBounds(this.sprite.getX(), this.sprite.getY(), this.sprite.getWidth(), this.sprite.getHeight());
this.setOrigin(this.sprite.getWidth() / 2, this.sprite.getHeight() / 2);
this.setScale(0.25f);
this.addListener(new ActorGestureListener() {
#Override
public void tap (InputEvent event, float x, float y, int pointer, int button) {
((Tess)event.getTarget()).toggleSelect();
}
});
}
#Override
public void draw(Batch batch, float alpha){
sprite.draw(batch);
}
#Override
public void positionChanged(){
sprite.setPosition(getX(), getY());
}
public void toggleSelect(){
this.selected = !this.selected;
if (this.selected == true)
sprite.setColor(0.5f, 0f, 0.5f, 1f);
else
sprite.setColor(0f, 0f, 0f, 0f);
}
}
First thing changed: you should use a Sprite, not a Texture, to handle color, drawing and transformations easily. Texture is possible, but is not as straightforward as Sprite is.
Next, you need to call setTouchable(Touchable.enabled) inside the actor to actually enable hit detection. Without this, no touch events are passed to the Actor.
After that, with setBounds(), you need to use sprite.getX() and sprite.getY(), to utilize the Sprite's positional values. Setting them to any arbitrary number seems to disable any touch capacity for that Actor.
Another thing, if all of that had been OK, is that you were setting the color twice for each touch, once based on the selected field, and then immediately after straight to the dark purple, so I removed the second set and just used your toggle method.
Next, since we have a Sprite now, we can use the draw() method attached to the Sprite itself and feed it the Batch, instead of calling the Batch's draw.
Finally, when you want to change the position of the image, call setPosition on the actor itself, and utilize an override of the positionChanged() method to set the Sprite's position based on the Actor's new position.
I'm new to LibGDX and I am trying to get my screen resolution sizes set up first before I get into the actual game itself. Before I added extendViewport I had an orthographic Camera and an Image that displayed. But when I got rid of the orthographic camera and added the Viewport the image disappeared. Here is the code i have for the the screen.
public class GameScreen implements Screen {
SlingshotSteve game;
private ExtendViewport viewport;
PerspectiveCamera camera;
public void Menu(SlingshotSteve game){
this.game = game;
}
SpriteBatch batch;
TextureRegion backgroundTexture;
Texture texture;
GameScreen(final SlingshotSteve gam) {
this.game = gam;
batch = new SpriteBatch();
Texture texture = new Texture(Gdx.files.internal("background.jpg"));
backgroundTexture = new TextureRegion(texture, 0, 0, 500, 500);
Music mp3Sound = Gdx.audio.newMusic(Gdx.files.internal("rain.mp3"));
mp3Sound.setLooping(true);
mp3Sound.play();
}
public void render(float delta) {
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
camera.update();
batch.setProjectionMatrix(camera.combined);
batch.begin();
batch.draw(backgroundTexture, 0, 0, SlingshotSteve.WIDTH, SlingshotSteve.HEIGHT);
batch.end();
}
#Override
public void resize(int width, int height) {
viewport.update(width, height);
}
#Override
public void dispose() {
batch.dispose();
texture.dispose();
}
#Override
public void show() {
camera = new PerspectiveCamera();
viewport = new ExtendViewport(800, 480, camera);
}
}
The other question I have is that this screen is the main game screen where Level 1 is going to occur. Since I added a main menu I had to switch from the "Application Listener" to the "Implement Screen". Is this correct, or do I have to go back to the Application Listener to get the Create() method? I'm not completely sure what everything means so If someone could please explain this to me that would be great!
I'm developping games with LIBGDX on ANDROID. Today, i've tried to generate one of my project in a HTML5 version. I put the content of the WAR folder on my server. All is fine except 2 things. I'll present you here just one of these 2 issues.
The problem : when a texture has to be disposed (by the call of its method dispose()), i get a BufferUnderflowException. It happens everytime.
Here is the sample code which is automatically generated when you create a new project :
public class TexDispose implements ApplicationListener
{
private OrthographicCamera camera;
private SpriteBatch batch;
private Texture texture;
#Override
public void create() {
float w = Gdx.graphics.getWidth();
float h = Gdx.graphics.getHeight();
camera = new OrthographicCamera(1, h/w);
batch = new SpriteBatch();
texture = new Texture(Gdx.files.internal("data/libgdx.png"));
Gdx.input.setInputProcessor(this);
}
#Override
public void dispose() {
batch.dispose();
texture.dispose(); // HERE IS THE ERROR
}
#Override
public void render() {
Gdx.gl.glClearColor(1, 1, 1, 1);
Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
batch.setProjectionMatrix(camera.combined);
batch.begin();
batch.end();
}
#Override
public void resize(int width, int height) {
}
}
Has one of you already met this issue..? If yes, how can i avoid that (except by not disposing anything lol) ?
Thank you ! ;)