CODEWITHSUNDEEP
openglglslshaderlwjgl
Tefek
Tefek

Reputation: 162

LWJGL 3 - Clipping mask

For drawing, I am using VAOs with glDrawElements and GLSL 3.30.

Imagine you have two objects (image below), the cyan one is the mask, and the red circle is the object to be clipped. All other objects aren't affected by the mask.

Only the part inside the cyan is showing on the screen.

What would be the most effective way to make this in real-time (no alpha maps), so it could be animated?

Upvotes: 0

Views: 680

Answers (1)

elect
elect

Reputation: 7190

You could use the stencil test. Essentially you render the mask first writing a specific stencil values, then you render the red circle only where you do not have those values.

Some good resources:

Upvotes: 3

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