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
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.
This avoids a shader compile error when using SSS and PREMUL_ALPHA_FACTOR in the same shader.
This doesn't change any functionaility, since in practive, the split-specular shader variant is only ever used for opaque objects while using premul alpha makes the object non-opaque
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.
This can result in low fog densities being a bit brighter, which may need slight adjustment in your scenes.
In exchange, volumetrics now blend smoothly together with the scene and regular fog.
Fixes#101514
This commit changes adjustments to behave as follows for all rendering configurations:
- Apply brightness to linear-encoded values, preventing contrast, saturation, and hue from being affected.
- Apply contrast to perceptually uniform (nonlinear sRGB-encoded) values, matching existing behavior when HDR 2D is disabled and producing optimal visual quality.
- Apply saturation with even color channel weights. This causes brightness of certain colors to change, but matches existing behavior when HDR 2D is disabled.
Adjustments are applied after glow and tonemapping to match existing behavior.
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>
Skyth
Clay John
Rémi Verschelde
Rémi Verschelde
Thaddeus Crews
BlueCube3310
Allen Pestaluky
Dario
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Stuart Carnie
Rudolph Bester
Colby Klein
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