hlsl – Tarik Billa

When does the transition from clip space to screen coordinates happen?

August 21, 2023 by Tarik

No, clip space and NDC space are not the same thing. Clip space is actually one step away from NDC, all coordinates are divided by Clip.W to produce NDC. Anything outside of the range [-1,1] in resulting NDC space corresponds to a point that is outside of the clipping volume. There is a reason the … Read more

Do conditional statements slow down shaders?

January 1, 2023 by Tarik

What is it about shaders that even potentially makes if statements performance problems? It has to do with how shaders get executed and where GPUs get their massive computing performance from. Separate shader invocations are usually executed in parallel, executing the same instructions at the same time. They’re simply executing them on different sets of … Read more