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Index › Programming Questions & Help › OpenGL and 3D Libraries › Layers - keeping things seperate
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Layers - keeping things seperate (Read 463 times)
lord_funk
Layers - keeping things seperate
Jul 28th, 2008, 12:53am  
I've made a drawing app, and the drawing field is sampled for brightness and the values outputted.  This happens from left to right, and I've made a playback wiper to scroll across the screen.

The problem is, the playback wiper interferes with things like get(), drawing functions, etc., as it's being drawn as part of the image that's being sampled and altered.

Is there a way to put the wiper on a different 'layer' so that it won't be interfering with the drawing or filtering?  Is moving to OpenGL the answer?
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CongoZombie
Re: Layers - keeping things seperate
Reply #1 - Jul 28th, 2008, 2:37am  
You could just copy the pixels to a buffer before you draw the "wiper" and then copy them back at the beginning of the next frame:


Code:

//in your draw loop:

loadPixels();
for (int i=0; i<width*height; i++) { 
      pixels[i] = pixelBuffer[i];  
}
updatePixels();


//Do your drawing stuff

loadPixels();
for (int i=0; i<width*height; i++) { 
      pixelBuffer[i] = pixels[i];  
}
updatePixels();

//Draw your wiper


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lord_funk
Re: Layers - keeping things seperate
Reply #2 - Jul 28th, 2008, 6:09pm  
Brilliant, thanks.  I had a similar system going, but it wasn't nearly as elegant as this (plus it didn't work).
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