Can't get loadShader() to work

Programming Questions

dlillard5

Can't get loadShader() to work

in Programming Questions • 3 months ago

Okay, I can't get loadShader() to work. I'm just going through the shader tutorial on Processing's site as a possible solution to the question I asked yesterday, but I can't complete the simple task of loading my shader files.

PShader myShader;

void setup(){
size(600,400,P2D);
myShader=loadShader("myfrag.glsl","myvert.glsl");
}

void draw(){
shader(myShader);
}

My files:

Replies(7)

amnon.owed

Re: Can't get loadShader() to work

3 months ago

What do you mean by can't get it to work?

What is the error message?

Do the examples in Topics > Shaders work?

PhiLho

Re: Can't get loadShader() to work

3 months ago

I only glanced at the tutorial (although I will read it attentively later), but from what I saw, you probably need to draw something to see the shader in action.

dlillard5

Re: Can't get loadShader() to work

3 months ago

Here's the error

The file "myvert.glsl" is missing or inaccessible, make sure the URL is valid or that the file has been added to your sketch and is readable.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

at processing.opengl.PGraphicsOpenGL.getShaderType(PGraphicsOpenGL.java:6339)

at processing.opengl.PGraphicsOpenGL.loadShader(PGraphicsOpenGL.java:6214)

at processing.core.PApplet.loadShader(PApplet.java:11314)

at shaderitup_.setup(shaderitup_.java:21)

at processing.core.PApplet.handleDraw(PApplet.java:2241)

at processing.opengl.PGL$PGLListener.display(PGL.java:3274)

at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:576)

at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:561)

at javax.media.opengl.awt.GLCanvas$7.run(GLCanvas.java:1054)

at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1024)

at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:899)

at javax.media.opengl.awt.GLCanvas$8.run(GLCanvas.java:1065)

at javax.media.opengl.Threading.invoke(Threading.java:193)

at javax.media.opengl.awt.GLCanvas.display(GLCanvas.java:483)

at javax.media.opengl.awt.GLCanvas.paint(GLCanvas.java:537)

at sun.awt.RepaintArea.paintComponent(RepaintArea.java:276)

at sun.awt.RepaintArea.paint(RepaintArea.java:241)

at apple.awt.ComponentModel.handleEvent(ComponentModel.java:263)

at java.awt.Component.dispatchEventImpl(Component.java:4852)

at java.awt.Component.dispatchEvent(Component.java:4604)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:717)

at java.awt.EventQueue.access$400(EventQueue.java:82)

at java.awt.EventQueue$2.run(EventQueue.java:676)

at java.awt.EventQueue$2.run(EventQueue.java:674)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)

at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:97)

at java.awt.EventQueue$3.run(EventQueue.java:690)

at java.awt.EventQueue$3.run(EventQueue.java:688)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:687)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Already called beginDraw()

The file "myvert.glsl" is missing or inaccessible, make sure the URL is valid or that the file has been added to your sketch and is readable.

java.lang.RuntimeException: java.lang.NullPointerException

at com.jogamp.common.util.awt.AWTEDTExecutor.invoke(AWTEDTExecutor.java:58)

at jogamp.opengl.awt.AWTThreadingPlugin.invokeOnOpenGLThread(AWTThreadingPlugin.java:100)

at jogamp.opengl.ThreadingImpl.invokeOnOpenGLThread(ThreadingImpl.java:205)

at javax.media.opengl.Threading.invokeOnOpenGLThread(Threading.java:172)

at javax.media.opengl.Threading.invoke(Threading.java:191)

at javax.media.opengl.awt.GLCanvas.display(GLCanvas.java:483)

at processing.opengl.PGL.requestDraw(PGL.java:1201)

at processing.opengl.PGraphicsOpenGL.requestDraw(PGraphicsOpenGL.java:1604)

at processing.core.PApplet.run(PApplet.java:2140)

at java.lang.Thread.run(Thread.java:680)

Caused by: java.lang.NullPointerException

at processing.opengl.PGraphicsOpenGL.getShaderType(PGraphicsOpenGL.java:6339)

at processing.opengl.PGraphicsOpenGL.loadShader(PGraphicsOpenGL.java:6214)

at processing.core.PApplet.loadShader(PApplet.java:11314)

at shaderitup_.setup(shaderitup_.java:21)

at processing.core.PApplet.handleDraw(PApplet.java:2241)

at processing.opengl.PGL$PGLListener.display(PGL.java:3274)

at jogamp.opengl.GLDrawableHelper.displayImpl(GLDrawableHelper.java:576)

at jogamp.opengl.GLDrawableHelper.display(GLDrawableHelper.java:561)

at javax.media.opengl.awt.GLCanvas$7.run(GLCanvas.java:1054)

at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1024)

at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:899)

at javax.media.opengl.awt.GLCanvas$8.run(GLCanvas.java:1065)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)

at java.awt.EventQueue.access$400(EventQueue.java:82)

at java.awt.EventQueue$2.run(EventQueue.java:676)

at java.awt.EventQueue$2.run(EventQueue.java:674)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

The examples in Topics > Shaders work.

amnon.owed

Re: Can't get loadShader() to work

3 months ago

What get's printed to the console when you add the following line to setup():

println(new File(dataPath("")).list());

dlillard5

Re: Can't get loadShader() to work

3 months ago

Ohh OSX tricked me. I thought it was showing the full file extension but my files were actually called "filename.glsl.txt". Thanks

PhiLho

Re: Can't get loadShader() to work

3 months ago

Windows does the same by default, I never understood this business of hiding information...

GoToLoop

Re: Can't get loadShader() to work

3 months ago

1 of the 1st things I do when installing Windows from scratch is disabling that
"Hide extensions for known file types" @ Folder Options.

Perhaps this thing alone may've been responsible for at least 1/3 of malware contamination.
For a user is neither aware of what type of file he/she's blindly double-clicking at,
nor being educated about the importance of MIME types!