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app: keep the skyline backdrop anchored at any draw distance scale

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mchughalex 2026-07-20 00:00:26 +01:00
parent 84f3f94ceb
commit 5a46eac8fa
1 changed files with 13 additions and 9 deletions
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22
src/skate3_draw_distance.cpp
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@ -13,7 +13,13 @@
// 2. Per-zone optimesh mesh cull: WorldPresEntityOptimesh rebuilds a
// {camX, drawDistance, camZ, 1} reference vector at entity+512 every
// frame (sub_82792900, attribute 0x2E9AAECD1C29F81F); the cull job
// compares world-mesh pieces against lane 1.
// compares world-mesh pieces against lane 1. Lane 1 is NOT scaled:
// the vector doubles as the entity's world anchor (the entity parks
// drawDistance meters above the camera so its own cull distance is a
// constant), and backdrop meshes anchored to the entity - the fake
// skyline dome - render at that height, so scaling it visibly raised
// the skyline off the horizon. Zone pieces still reach x k through
// the shared contribution-cull threshold in (1).
//
// 3. Character LOD bands: SceneRenderView::GetLODDistancesFromAttrib
// (sub_827E1AD8) rewrites six squared switch distances every frame,
@ -295,9 +301,12 @@ extern "C" REX_FUNC(sub_8288DC58) {
// WorldPresEntityOptimesh per-frame update: rebuilds the size-cull reference
// vector at entity+512 from a global camera vector, with lane 1 replaced by
// the zone attribute. The cull job projects this vector onto the view axis
// as the synthetic mesh size (size * engage / dist^2 >= threshold), so only
// the lane-1 term is per-zone; scale it in place each frame.
// the zone attribute. Lane 1 doubles as the entity's world-space height
// (the entity is parked that many meters above the camera so its cull
// distance stays constant), and the fake-skyline backdrop renders anchored
// to it - scaling lane 1 visibly raised the skyline off the horizon by
// (k - 1) x drawDistance meters. Zone reach therefore rides the shared
// contribution-cull threshold scaling only; lane 1 stays untouched.
extern "C" REX_FUNC(sub_82792900) {
const uint32_t entity = ctx.r3.u32;
__imp__sub_82792900(ctx, base);
@ -313,11 +322,6 @@ extern "C" REX_FUNC(sub_82792900) {
LoadGuestF32(base, entity + 520));
}
}
const double scale = REXCVAR_GET(skate3_draw_distance_scale);
if (std::abs(scale - 1.0) > kScaleEpsilon) {
const uint32_t addr = entity + 516;
StoreGuestF32(base, addr, float(double(LoadGuestF32(base, addr)) * scale));
}
// Drone camera engaged: recenter the size-cull reference on the flown
// position (lanes 0/2 are the camera X/Z the cull job measures distance
// from) so world pieces near the drone don't get distance-culled against