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Index › Programming Questions & Help › OpenGL and 3D Libraries › Weird (blueish) Texture Rendering with GLGraphics
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Weird (blueish?) Texture Rendering with GLGraphics (Read 650 times)
cappelnord
Weird (blueish?) Texture Rendering with GLGraphics
Jan 7th, 2009, 1:40pm  
Hi, i hope someone can help me with this:

I am quite happy with GLGraphics and it's GLSL capabilities. But somehow every Texture is rendered quite odd. Here is a little example:



import codeanticode.glgraphics.*;
import processing.opengl.*;

GLTexture tex;

void setup()
{
 size(800,600, GLConstants.GLGRAPHICS);
 tex = new GLTexture(this, "test.jpg");
}

void draw()
{
 background(0);
 image(tex,0,0);
}


I asume, that it should simply draw test.jpg ( http://mix.crea-bmb.de/test.jpg ) on the screen. But it turns out to be some blue-channel-only thing ( http://mix.crea-bmb.de/blue.png ). If i turn the background to red you see, that it also blends the texture with the background ( http://mix.crea-bmb.de/red.png ).

It also happens in more complex examples. Shaders work great though!

I run a Powerbook G4 1.5Ghz with a ATI Mobility Radeon 9700 on Leopard 10.5.6. Processing 1.0.1, GLGraphics 0.8.9.4 (latest)

Hope something has an answer for this strange behaviour!

Many thanks in advance!
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ac
Re: Weird (blueish?) Texture Rendering with GLGrap
Reply #1 - Jan 8th, 2009, 8:49pm  
hi,

I think I found the bug in glgraphics that causes this problem. The strange thing is that it doesn't show up in the video cards I have been using so far... Try this version of glgraphics:

http://users.design.ucla.edu/~acolubri/test/glgraphics-20090108.zip

and let me know what happens.
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cappelnord
Re: Weird (blueish?) Texture Rendering with GLGrap
Reply #2 - Jan 8th, 2009, 10:11pm  
hi,

thanks for the fix. it's getting better! the texture doesn't blend with the background anymore but the colors aren't right yet!

http://mix.crea-bmb.de/update.png
compared to the source image: http://mix.crea-bmb.de/test.jpg

maybe the final fix is near Smiley thanks in advance!
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ac
Re: Weird (blueish?) Texture Rendering with GLGrap
Reply #3 - Jan 9th, 2009, 5:07pm  
What happens when you try the following code. Are the colors ok?

Code:

import processing.opengl.*;
 
PImage img;
 
void setup()
{
  size(800,600, OPENGL);
  img = loadImage("test.jpg");
}
 
void draw()
{
  background(0, 255, 0);
  beginShape(QUADS);
  texture(img);
  vertex(0, 0, 0, 0, 0);
  vertex(width, 0, 0, img.width, 0);
  vertex(width, height, img.width, img.height);
  vertex(0, height, 0, 0, img.height);
  endShape();  
}
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cappelnord
Re: Weird (blueish?) Texture Rendering with GLGrap
Reply #4 - Jan 10th, 2009, 12:05pm  
yes, everything looks fine with this code.
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