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Code Issues 154 Wiki Activity

Fix the screen space ambient occlusion and add ground truth ambient occlusion to the GL 4.6 renderer

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Hirek
2026-10-15 23:03:50 +02:00
parent ce725c3d62
commit 5f365a00c5
13 changed files with 564 additions and 50 deletions
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docs/opengl46-renderer.md
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@@ -81,6 +81,21 @@ existed.
The automatic exposure and the bloom need the post processing pipeline (`gfx.skippipeline no`, the default).
Model previews of the editor use none of these.
### Ambient occlusion
Darkening of creases, corners and the ground under objects, worked out from the depth of the image (screen space)
and multiplied into the image before the motion blur and the tonemapping. It works with and without motion blur.
It darkens all light alike, the sun and the headlights included; limiting it to the ambient light needs the depth
before the shading (a depth prepass), which is planned later.
| Entry | Default | Meaning |
|---|---|---|
| `gfx.postfx.ao gtao/ssao/no` | `gtao` | `gtao` (or `yes`): ground truth ambient occlusion (Jimenez et al. 2016), at half the resolution with a depth aware smoothing and upsampling. `ssao`: the older, experimental ssao. `no`: none, and no targets are made for it; the mode can then not be turned on in the debug window |
| `gfx.postfx.ao.radius` | `1.5` | 0.1..10: reach of the occluders, metres |
| `gfx.postfx.ao.strength` | `1.0` | 0..4: power the occlusion is raised to; 1 = as computed, 0 = none |
| `gfx.postfx.ao.bounce` | `0.3` | 0..1: albedo of the surfaces assumed for the light that comes back after more bounces (brightens the occlusion a little) |
| `gfx.postfx.ao.quality slices steps` | `3 4` | directions searched around each pixel (1..8) and samples on each side of a direction (1..16) |
### Changed option
`dynamiclights` (0..7) used to limit the number of headlight sets that light the surroundings. It is still
@@ -96,7 +111,7 @@ read, but it only takes effect with `gfx.lights.clustered no`.
`gfx.lights.clustered no`.
- **Reflections (environment map)** are lit with the sun as seen from the reflection itself, and vehicle
headlights no longer light the scene in them.
- **Motion blur and SSAO** read the real depth of the scene. Before, the depth texture was read in a way the
- **Motion blur and ambient occlusion** read the real depth of the scene. Before, the depth texture was read in a way the
specification leaves undefined, and the result depended on the driver.
- **Lines are 1 pixel wide**, as they always were on this kind of context. The widths the code asked for
(catenary wires, map tracks) never took effect.
@@ -116,7 +131,8 @@ editor goes through the first `dynamiclights` headlights, the reflections throug
- **Sky and exposure** window (next to the Light clusters window): the switches and scales above, the share of the
atmosphere, the colours of the sun, ambient light and fog in use, and the measured luminance and exposure.
Shift+F12 shows the GPU time of `atmosphere:` (look-up tables, only when the sun moved or the weather changed),
`envmap ggx:` (prefiltering, with each update of the environment map), `exposure:` and `bloom:`.
`envmap ggx:` (prefiltering, with each update of the environment map), `exposure:` and `bloom:`. The same window holds
the ambient occlusion mode and its settings; Shift+F12 shows its time as `ambient occlusion:` (gtao only).
- `gfx.gldebug yes` turns on the OpenGL debug output (`KHR_debug`); messages go to the log.
## Building