How to modify shader by adding or removing defines during Viewer::update() #970
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There are many examples, usually named "dynamic", that modify the scene during the update phase of the presentation/event loop. However, I'm struggling to change the shader stages attached to a GraphicsPipeline within a scene graph from within this loop. I'm working up a minimal example, but maybe there is already an example that I missed or something I should look into? |
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There isn't an example that illustrates change the defines at runtime. If you need to change the stages are runtime you are essentially requiring a whole new pipeline to be created, it's not a lightweight dynamic change like updating the contents of a vertex array, uniform or texture. What you may be able to do is use separate GraphicsPipeline's with the different defines combinations and then assign them as required or use a SwitchState to toggle between them. |
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There isn't an example that illustrates change the defines at runtime.
If you need to change the stages are runtime you are essentially requiring a whole new pipeline to be created, it's not a lightweight dynamic change like updating the contents of a vertex array, uniform or texture.
What you may be able to do is use separate GraphicsPipeline's with the different defines combinations and then assign them as required or use a SwitchState to toggle between them.