Normalized tex coords don't work

[mruegenberg]

When I put ofEnableNormalizedTexCoords at the start of ofApp::setup in example-Basic, the client no longer renders the texture from the server correctly.

The same happens I do

mClient.bind();
mClient.getTexture().draw(50,50);
mClient.unbind();

instead.

[mruegenberg]

It works when doing

bool didUseNormalizedTexCoords = ofGetUsingNormalizedTexCoords();
ofDisableNormalizedTexCoords();
mClient.draw(50, 50);
if(didUseNormalizedTexCoords)
    ofEnableNormalizedTexCoords();

This feels kind of hacky though, and doesn't really work for code that expects normalized texture coords.

[mruegenberg]

I "solved" it by rendering the Syphon result to a FBO first. I then use its texture where normalized tx coords are required. Not very efficient, but seems like a somewhat acceptable workaround:

if((! mSyphonFbo.isAllocated()) ||
   mSyphonClient.getWidth() > mSyphonFbo.getWidth() ||
   mSyphonClient.getHeight() > mSyphonFbo.getHeight()) {
    // (re)allocate Syphon target FBO
    int w = mSyphonClient.getWidth();
    if(w < 10) w = 10;
    int h = mSyphonClient.getHeight();
    if(h < 10) h = 10;
    mSyphonFbo.allocate(w, h); // hope that this doesn't leak the previous texture if called twice
}

// ...

bool didUseNormalizedTexCoords = ofGetUsingNormalizedTexCoords();
ofDisableNormalizedTexCoords();
mSyphonFbo.begin();
ofClear(0);
mSyphonClient.draw(0,0);
mSyphonFbo.end();

[bangnoise]

Perhaps we're not adequately configuring our ofTexture - still an issue in OF 0.10 RC4. Any ideas @astellato ?

[astellato]

I believe that Syphon requires non-normalized tex coordinates. Don't have access to a Mac at the moment, so I can't test what our new options could be in OF 0.10.

[bangnoise]

The texture from SyphonClient is GL_TEXTURE_RECTANGLE but OF should be able to cope with that - I'm not familiar enough to know what the intended affect of ofEnableNormalizedTexCoords() is and how an ofTexture should be configured and used when it's enabled - perhaps our calls to ofTexture::draw() should be different?