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View Code? Open in Web Editor NEWA Signed Distance Bounds renderer using Apple's Metal compute pipeline
License: Apache License 2.0
A Signed Distance Bounds renderer using Apple's Metal compute pipeline
License: Apache License 2.0
Passing mutable data to the compute function causes catastrophic degradation in rendering performance.
This is likely due to the data access pattern being unrelated to the pixel position, resulting in a lot of memory flushing.
The latest iOS and OSX releases of metal support function constants in compute functions.
Library compilation is split into two phases, the first phase compiles the library and is run once.
The second phase returns a specific kernel function with the function constants baked in, this is run every time the function constants change, which may be in response to user input.
Using function constants reduces the time to compile a custom version of a kernel to approx 100ms from approx 600ms on an iPhone6+
Currently the renderer runs separate loops for Ambient Occlusion and Reflection mapping.
It should be more efficient to run a single loop that tests for both cases.
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