Reduce the mipmap levels so that the border is pixel perfect
Always use the high quality downsample to reduce jaggies
Fix the jacobian approximation so that it actually helps account for the octahedral distortion
This allows the ARG to better optimize their usage for mobile devices.
In particular, this allows the ARG to avoid loading the contents of the texture into tile memory when rendering into the texture if the contents won't be used anyway.
Also optimize all tonemappers to perform less calculations per-pixel.
Note: unlike `white`, `agx_white` is limited to a minimum of `2.0` and defaults to `16.29`. When using a RGB10A2 render buffer, `agx_white` will be ignored and a value of `2.0` will be used instead to ensure good behavior on the Mobile renderer.
Mobile devices are typically bandwidth bound which means we need to do as few texture samples as possible.
They typically use TBDR GPUs which means that all rendering takes place on special optimized tiles. As a side effect, reading back memory from tile to VRAM is really slow, especially on Mali devices.
This commit uses a technique where you do a small blur while downsampling, and then another small blur while upsampling to get really high quality glow. While this doesn't reduce the renderpass count very much, it does reduce the texture read bandwidth by almost 10 times. Overall glow was more texture-read bound than memory write, bound, so this was a huge win.
A side effect of this new technique is that we can gather the glow as we upsample instead of gathering the glow in the final tonemap pass. Doing so allows us to significantly reduce the cost of the tonemap pass as well.
Additionally, change the minimum `tonemap_white` parameter to `1.0`; users can increase `tonemap_exposure` for a similar effect to decreasing `tonemap_white` below `1.0`.
Co-authored-by: Hei <40064911+Lielay9@users.noreply.github.com>
Co-authored-by: Hugo Locurcio <hugo.locurcio@hugo.pro>
- Use Title Case for all labels, and add hyphens where relevant.
- Mention Roughness in SSR Filter's label name, as it's only enabled
when the SSR roughness quality is not set to Disabled.
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>
