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Code Issues 151 Wiki Activity

Draw instances from the GPU culling with indirect draws, occlusion culling and a depth prepass

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Hirek
2026-10-16 12:54:52 +02:00
parent 2f0a06b98e
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docs/opengl46-renderer.md
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@@ -164,6 +164,25 @@ Lamps of vehicles and lit compartments cast no shadows. The memory taken is 2 ma
| `gfx.lights.shadows.lamps.range` | `100` | distance from the camera within which scenery lamps cast shadows, metres |
| `gfx.lights.shadows.vehicles.range` | `50` | distance from the camera within which vehicles (and the occupied cab) cast the shadows of scenery lamps, metres; 0: only the scenery does |
### Models drawn from the GPU
Many models of the scenery (trees, bushes, poles, fences: models without lights and animations) are drawn in batches, one
batch per model and level of detail. Which of them are drawn, and at which level of detail, can be worked out on the
processor (as before) or on the graphics card. On the graphics card the processor no longer goes through the models one by
one, so with dense vegetation it is much less loaded. Only the main view is drawn this way; shadows, reflections and other
views go as before.
| Entry | Default | Meaning |
|---|---|---|
| `gfx.gpucull` | `no` | `no`: on the processor, as before. `yes`: on the graphics card, and the models are drawn from its result. `compare`: on the processor, which draws, and on the graphics card too, for the results to be compared (debugging) |
| `gfx.gpucull.occlusion yes/no` | `yes` | with `gfx.gpucull yes`: models hidden whole behind what was drawn before them (the cab, the terrain, buildings and other models drawn on their own, vehicles) are left out |
| `gfx.depthprepass yes/no` | `yes` | with `gfx.gpucull yes`: the depth of the models is drawn first, so the colour is worked out only for what stays in view (dense foliage) |
The occlusion test does not take models drawn this way as covering each other: a tree hidden behind another tree is still
drawn (its colour is not worked out with the depth prepass on). Models whose material is not one of the usual ones (parallax,
water and the like) are left out of the depth prepass and drawn as before. All three can be changed while the simulator
runs, in the **Instance culling** debug window.
### Changed option
`dynamiclights` (0..7) used to limit the number of headlight sets that light the surroundings. It is still
@@ -210,6 +229,11 @@ editor goes through the first `dynamiclights` headlights, the reflections throug
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:`. The same window holds
the ambient occlusion mode and its settings; Shift+F12 shows its time as `ambient occlusion:` (gtao only).
- **Instance culling** window: the mode of `gfx.gpucull` and the two switches above. With `gfx.gpucull yes` Shift+F12 shows
`gpu cull:` (models drawn and hidden by the occlusion test, as counted on the graphics card a few frames before, the levels
of detail, the draw calls with those of the depth prepass, and the processor time of the whole step) and the timings
`instance cull:`, `occlusion depth:` (the depth pyramid of the test) and `depth prepass:`. With `compare` it shows how many
models both counted and how many levels of detail differ.
- `gfx.gldebug yes` turns on the OpenGL debug output (`KHR_debug`); messages go to the log.
## Building