Screen space reflection with hierarchical ray tracer

[fall2019]

Also add SSR mask to choose object receiving reflection.

hizssr.mp4

[MomoDeve]

Hi, thanks for PR!
Have not start in-depth review process yet, but lets do couple of things to simplify the process and speed-up the merge

1. I see there is a bunch of refactoring in shaders going on, this can be moved in a separate PR and be quickly reviewed
2. I see you introduce a constant to conditionally compile code for compute & fragment shaders. I think this can be done in a different way, create common_utils file, then compute_utils & fragment_utils and include common there. With this, compute shaders can include compute_utils, fragment - fragment_utils, and we do not need conditional computation at all

[fall2019]

Hi, thanks for PR! Have not start in-depth review process yet, but lets do couple of things to simplify the process and speed-up the merge

1. I see there is a bunch of refactoring in shaders going on, this can be moved in a separate PR and be quickly reviewed
2. I see you introduce a constant to conditionally compile code for compute & fragment shaders. I think this can be done in a different way, create common_utils file, then compute_utils & fragment_utils and include common there. With this, compute shaders can include compute_utils, fragment - fragment_utils, and we do not need conditional computation at all

👌I will do it.
Refactoring of shader compilation

[MomoDeve]

I made a glass bricks (remove roughness texture, roughness=0, metallness=1). When I set "receieve SSR" I got degradation from 5ms to 20ms. Thats not acceptable performance. It should behave normal on all scenes

[MomoDeve]

these artefacts under objects also need to be fixed. There should be a depth check

[MomoDeve]

Cost is way less than 1ms under level=2. Higher level also can produce less noisy result. This method can be the base to do further advanced optimizations like ray reuse and prefiltered samples in the future.

you are measuring CPU performance with that! There is no GPU performance profiling in engine yet

[MomoDeve]

this cant be merged with poor performance

Profile shader performance on different scenes and materials!

Use third party app like nsight to measure actual gpu performance and optimize the shader

please include the measurements after fixes

[fall2019]

[fall2019]

Improved performance. Packed all depth maps into one texture and tested with different scenes.
Fixed artefacts under objects.
Fixed formats and warnings.
Performance issue is resolved rn. It takes from 1ms to 2ms.

[fall2019]