Load GLTexture from Thread while sketch is running

bustup

Load GLTexture from Thread while sketch is running

in Contributed Library Questions • 2 years ago

Hey guys, I get a "Invalid memory access of location 0x318 rip=0x7fff85730328" error when running this code.

Seems like I can't create a new GLTexture object while the sketch is running, which is a bit weird. Code seems fine to me.

Any suggestions?

TextureTest.java

package texturetest;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import processing.core.PApplet;
import codeanticode.glgraphics.GLConstants;
import codeanticode.glgraphics.GLGraphicsOffScreen;
public class TextureTest extends PApplet {
/**
*
*/
private static final long serialVersionUID = -8305191326600292350L;
private GLGraphicsOffScreen glos;
private ArrayList<Texture> textures;
private LoaderThread loaderThread;
private boolean keyreleased;
public void setup() {
size(screenWidth, screenHeight, GLConstants.GLGRAPHICS);
textures = new ArrayList<Texture>();
textures = loadImages("data/");
glos = new GLGraphicsOffScreen(this, width, height, false);
loaderThread = new LoaderThread(this, 1);
loaderThread.start();
keyreleased = false;
}
public void draw() {
glos.beginDraw();
glos.clear(0);
for (int i = 0; i < textures.size(); i++) {
Texture tex = textures.get(i);
if (tex.hasTexture() && !keyreleased)
glos.image(tex.getTexture(), i * 210, 0, 200, 200);
}
glos.endDraw();
image(glos.getTexture(), 0, 0, glos.width, glos.height);
}
public void keyPressed() {
keyreleased = true;
}
public void keyReleased() {
loaderThread.initializeTextures(textures);
keyreleased = false;
}
public ArrayList<Texture> loadImages(String path) {
FilenameFilter dirFilter = new FilenameFilter() {
public boolean accept(File dir, String name) {
return !name.startsWith(".");
}
};
ArrayList<Texture> t = new ArrayList<Texture>();
File filePath = new File(path);
String[] dirList = filePath.list(dirFilter);
if (filePath != null && filePath.list(dirFilter) != null) {
for (int i = 0; i < dirList.length; i++) {
File f = new File(path + dirList[i]);
if (f.isFile())
t.add(new Texture(this, path + dirList[i]));
}
}
return t;
}
public static void main(String _args[]) {
PApplet.main(new String[] { texturetest.TextureTest.class.getName() });
}
}

LoaderThread.java

package texturetest;
import java.util.ArrayList;
import processing.core.PApplet;
public class LoaderThread implements Runnable {
private Thread t;
private int sleepTime;
private ArrayList<Texture> textures;
private boolean updated;
public LoaderThread(PApplet parent, int sleepTime) {
this.sleepTime = sleepTime;
this.updated = true;
}
public void initializeTextures(ArrayList<Texture> textures) {
this.textures = textures;
this.updated = false;
}
public void run() {
Thread me = Thread.currentThread();
while (t == me) {
if (!updated) {
for (int i = 0; i < textures.size(); i++) {
textures.get(i).setTexture(textures.get(i).getFile());
textures.get(i).setHasTexture(true);
}
updated = true;
}
try {
Thread.sleep(sleepTime);
} catch (InterruptedException e) {
}
}
t = null;
}
void start() {
if (t == null) {
t = new Thread(this);
t.start();
}
}
void stop() {
if (t != null) {
t.interrupt();
}
t = null;
synchronized (this) {
notifyAll();
}
}
public void dispose() {
stop();
}
}

Texture.java

package texturetest;
import processing.core.PApplet;
import codeanticode.glgraphics.GLTexture;
public class Texture {
private PApplet parent;
private GLTexture texture;
private boolean hasTexture;
private String file;
public Texture(PApplet parent, String file) {
this.parent = parent;
this.file = file;
this.hasTexture = false;
}
public GLTexture getTexture() {
return texture;
}
public void setTexture(String file) {
this.texture = new GLTexture(parent, file);
}
public boolean hasTexture() {
return hasTexture;
}
public void setHasTexture(boolean hasTexture) {
this.hasTexture = hasTexture;
}
public String getFile() {
return file;
}
public void setFile(String file) {
this.file = file;
}
}

Thanks!

Replies(2)

bustup

Re: Load GLTexture from Thread while sketch is running

2 years ago

It's partially solved by loading a PImage in the LoaderThread first and then applying the PImage texture to the GLTexture by using putPixelsIntoTexture in the draw method in the main sketch.

If someone have a suggestions how to solve it by loading a GLTexture it would be greatly appreciated!

andres

Re: Load GLTexture from Thread while sketch is running

2 years ago

Your method is correct: is not possible to create your GLTextures inside the thread because OpenGL is not thread safe. See this related post.

Top Reply