[ GLGraphics ] FBO depth buffer ?

kohaistyle

[ GLGraphics ] FBO depth buffer ?

in Contributed Library Questions • 2 years ago

Hi everyone !

I'm a bit new to processing and java, but have a little background in GL programming. And so i found the GLGraphics lib, which is just too cool.

So question is : i looked into the FBO extension in GLGraphics, which is nice, you can grab the color buffer ... But is there a way to capture the depthbuffer ? ( By looking at the lib source, the offscreen extension is binding some DepthStencilBuffer, but the data is exposed in any way )

Any experienced programmer can shed some light on this ?

Thx a bunch

Replies(2)

andres

Re: [ GLGraphics ] FBO depth buffer ?

2 years ago

Hi, the class members in GLGraphicsOffScreen that handle all the buffers used in offscreen rendering are set as protected. In particular, the one you need to access OpenGL's depth buffer is depthStencilBuffer, which an int holding the OpenGL id of the buffer.

What you could do is to subclass GLGraphicsOffScreen and add a method that returns the current value of depthStencilBuffer:

CustomOffScreen off1, off2;
void setup() {
size(640, 480, GLConstants.GLGRAPHICS);
off1 = new CustomOffScreen(this, 320, 240, true, 4);
off2 = new CustomOffScreen(this, 200, 100);
println(off1.getDepthBuffer());
println(off2.getDepthBuffer());
...
}
class CustomOffScreen extends GLGraphicsOffScreen {
public CustomOffScreen(PApplet parent, int iwidth, int iheight, boolean multi, int level) {
super(parent, iwidth, iheight, multi, level);
}
public CustomOffScreen(PApplet parent, int iwidth, int iheight) {
super(parent, iwidth, iheight);
}
int getDepthBuffer() {
return depthStencilBuffer;
}
}

kohaistyle

Re: [ GLGraphics ] FBO depth buffer ?

2 years ago

God, this seems so simple when i look at your code !

Many thx for the piece of code, and another thk you for this wonderful library ;)

Going back at GL experimentation ...

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