Sending attribute to ofShader?

@ayruos wrote:

Hello! Doing some work with shaders and trying to figure how to send an attribute to the vertex shader. They’re being loaded from file and a mesh is being drawn so I have this at the moment…

void ofApp::setup{
shader.load("filename");
}

void ofApp::update(){
fbo.begin();
ofClear(0, 0);
shader.begin();
//a bunch of uniforms being sent here
mesh.draw();
shader.end();
fbo.end();
}

void ofApp::draw(){
fbo.draw(0, 0);
}

The mesh is being calculated/updated as a separate function, everything works fine, but for the vertex shader I want to send the index of each vertex (and the size of the mesh, but that’s a uniform) to be able to have some different functions depending on whether the vertex is at the beginning or end of the mesh.

I’m very confused about how to use the void ofShader::setAttribute1f(GLint location, float v1) function to send the index as an attribute.

I hope someone can point me in the right direction. Thanks!

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