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GLSL Multipass Tutorial

Started by Triscuit Mar 11, 2005 at 9:18 AM 0 replies 1.8k views

Original Post

Mar 11, 2005 at 9:18 AM

I have a vertex and fragment shader that unwrap a model into texture space and calculate per-pixel lighting. I then save it to a texture. What I want to do is in another pass, blur that texture 1 pixel in every direction. Does anyone have any pointers for implementing a multipass shader in GLSL?

dimensionX

Mar 11, 2005 at 10:53 AM

If you already have the unwrapped texture in the texture memory what the problem ? Bind that texture to a texture unit and enable the vertex/fragment shader that will do the blurring. Simply,

glUseProgramObject(unwrap shader);
......
glUseProgramObject(NULL);

.........
.........

glUseProgramObject(blur shader);
........
glUseProgramObject(NUL);

That's it!

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