Metal Support contributed by Migeran (https://migeran.com) and Stuart Carnie.
Co-authored-by: Stuart Carnie <stuart.carnie@gmail.com>
Co-authored-by: Gergely Kis <gergely.kis@migeran.com>
Add new shader built in Z_CLIP_SCALE to easily adjust clipping distance to avoid clipping walls etc.
Add fov_override to StandardMaterial3D to easily have a custom FOV for FPS objects
Add IN_SHADOW_PASS built-in to shaders for tweaking materials without impacting shadow maps
This batches together a couple of micro-optimizations that were discovered in profiling and analyzing disassembly.
Importantly, this reduces the amount of instructions in a heavy loop. This has the biggest impact when there are lots of objects and lights in the scene as the function is called once per objects + once per light that touches the object
Clustered performs the following shadow rendering steps
1. Process objects [0; 10) for cascade 0.
2. Process objects [10; 30) for cascade 1.
3. Process objects [30; 100) for cascade 2.
4. Upload objects [0; 100) to GPU.
5. Draw all cascades.
Mobile was supposed to be doing the same, but instead was doing:
1. Process objects [0; 10) for cascade 0.
2. Upload objects [0; 10) to GPU.
3. Process objects [10; 30) for cascade 1.
4. Upload objects [0; 30) to GPU.
5. Process objects [30; 100) for cascade 2.
6. Upload objects [0; 100) to GPU.
7. Draw all cascades.
That is, always reuploaded everything from scratch.
Therefore it pointlessly (and with geometric growth) wasted BW.
Clustered performs the following shadow rendering steps
1. Process objects [0; 10) for cascade 0.
2. Process objects [10; 30) for cascade 1.
3. Process objects [30; 100) for cascade 2.
4. Upload objects [0; 100) to GPU.
5. Draw all cascades.
Mobile was supposed to be doing the same, but instead was doing:
1. Process objects [0; 10) for cascade 0.
2. Upload objects [0; 10) to GPU.
3. Process objects [10; 30) for cascade 1.
4. Upload objects [0; 30) to GPU.
5. Process objects [30; 100) for cascade 2.
6. Upload objects [0; 100) to GPU.
7. Draw all cascades.
That is, always reuploaded everything from scratch.
Therefore it pointlessly (and with geometric growth) wasted BW.
This is a followup to PR #101344 (commit
0e06eb80bc).
Some of them were not an issue because Godot was initializing all
members, but they were "fixed" just in case since it could become a
problem in the future.
Valgrind was specifically complaining about HashMapData &
GlobalPipelineData.
