Texture Repeat/Tile Clamp

Programming Questions

Prob

in Programming Questions • 1 year ago

Hi,
is there a possibility to set texture repeating or clamping in processing (See http://iphonedevelopment.blogspot.com/2009/05/opengl-es-from-ground-up-part-6_25.html)

Because I have a problem with a parsed COLLADA file where coordinates are bigger than the loaded image which means the texture should be repeated.
But it seems that processing uses clamp instead of repeat.

How can I set the following from the article above:

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

Thanks!!

Replies(2)

jbum

Re: Texture Repeat/Tile Clamp

1 year ago

Using Processing 1.x and the GLGraphics library, you can issue lower level OpenGl calls like this (see the example code that comes with GLGraphics to see how). GLGraphics is currently being incorporated directly into Processing 2, but it's not quite ready for prime time yet.

poersch

Re: Texture Repeat/Tile Clamp

1 year ago

Sorry for replying to an old thread, but I had a very similar problem and found a simple solution. Just overwrite the given vertex() function as in the following code.

//////////////////////////////////////////////////////////
// Imports ///////////////////////////////////////////////
//////////////////////////////////////////////////////////
import processing.opengl.*;
import codeanticode.glgraphics.*;
//////////////////////////////////////////////////////////
// Vertex without clamping UV ////////////////////////////
//////////////////////////////////////////////////////////
public void vertex(float x, float y, float u, float v) {
g.textureU = u;
g.textureV = v;
super.vertex(x, y);
}
//////////////////////////////////////////////////////////
// Init //////////////////////////////////////////////////
//////////////////////////////////////////////////////////
void setup() {
size(400, 400, GLConstants.GLGRAPHICS);
background(#505050);
// The (repeating) texture parameters
GLTextureParameters textureParameters = new GLTextureParameters();
textureParameters.wrappingU = REPEAT;
textureParameters.wrappingV = REPEAT;
// Load a test texture
GLTexture test = new GLTexture(this, "http://dl.dropbox.com/u/6971729/ProcessingLogo.png", textureParameters);
// Use vertex like before
noStroke();
beginShape();
texture(test);
vertex(0, 0, 0, 0);
vertex(width, 0, 4, 0);
vertex(width, height, 4, 4);
vertex(0, height, 0, 4);
endShape();
}

For a 3D vertex() just use:

//////////////////////////////////////////////////////////
// Vertex without clamping UV ////////////////////////////
//////////////////////////////////////////////////////////
public void vertex(float x, float y, float z, float u, float v) {
g.textureU = u;
g.textureV = v;
super.vertex(x, y, z);
}

I'm using Processing 1.x & GLGraphics 1.0.0. :-)

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