Transform feedback

[bghgary]

Is there an equivalent of https://www.khronos.org/opengl/wiki/Transform_Feedback in bgfx? If not, would it make sense to add?

[bkaradzic]

No. You could use compute to transform vertices once. But could you specify use case / platform?

[bghgary]

We are trying to mimic WebGLTransformFeedback for Babylon Native. Trying to see what options are available. We want to compute bounding boxes (with skinning and morph targets) on the GPU instead of CPU. We would want this for Windows, macOS, iOS at the minimum, but ideally all platforms.

I've been searching the code in ANGLE to see how they do it, but I don't understand it yet.

[bkaradzic]

D3D11 for example have stream-output stage of the pipeline which is equivalent of transform feedback.

Transform feedback is kind of feature for targets without compute. If you have compute you don't need TF.

[bghgary]

We are looking into using compute, so this may be a moot ask at the end. Thanks for the responses!