About Enabling and Disabling texture in Fragment Program?

OpenGL OpenGL: Advanced Coding
1

I have a geomtry scene that some nodes have texture and others have not. What is confusing me is How to deal with this case in one fragment program?

I mean, If I use texture with some nodes, but when rendering other nodes without texture, what value will I get?

I think I can solve it by sorting the nodes in terms of texture. When I render the nodes with texture, I use one FP, And I render the nodes without texture ,I use another FP. Have any other Method to solve it?

2

you can pass an argument to your FP to switch between different path within the FP, but sorting your geometry and loading a different FP is BY FAR the most efficient way to deal with your “problem”…

g0b

3

We have currently 58 fragment programs, and still counting …

SeskaPeel.

4

Originally posted by zhq424:
Have any other Method to solve it?

Maybe you could set up a small(2x2) “empty” texture and use that as the texture for the nodes that don’t have a real texture bound to it. The definition of empty depends on what you do with the result. Addition=use black, modulation=use white. Just a thought.

5

glBindTexture(0) will enable a white texture.
It should work with your fragment program …

SeskaPeel.