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fix #427: sky drawn without fog like retail; world fog range is the keyframe's authored MinWorldFog/MaxWorldFog

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Two April stand-ins, neither registered, met at the horizon from altitude as
a hard line between the dome's rim and the fog-coloured clear:

1. sky.frag fogged every non-additive sky layer with a 0.2 floor. Retail's
   GameSky::Draw @0x00506FF0 disables fixed-function fog around the whole
   sky draw unless an AdminEnvirons fog override is active (SetFFFogEnable(
   LScape::m_override_enabled ? 1 : 0)); additive layers stay unfogged via
   SetFFFogAlphaDisabled(1) at D3DPolyRender::SetSurface 0x59c882. The sky
   pass now sets ApplyFog only for (override active && !additive), with no
   floor.
2. WorldRenderFrameBuilder overwrote the authored fog range with one derived
   from the streaming window (538..2189 m always). Retail sets FOGSTART/
   FOGEND straight from the keyframe's MinWorldFog/MaxWorldFog
   (SkyDesc::GetWorldFog @0x00500CE0 -> SetFFFogProperties @0x005A2F70) with
   no draw-distance scaling; zfar is a constant 4000 m. The builder now
   leaves SceneLightingUbo.Build's values alone; ACDREAM_FOG_START_MULT /
   _END_MULT are deleted from RuntimeOptions.

Guards: SkyFogRuleTests (source-level, the sky renderer has no hermetic
harness); sky.frag.spv re-pinned in VulkanShaderManifestTests with the
reason. Research note 2026-04-23-sky-fog.md carries a correction banner.
App hermetic 6,070/0, Core 4,707/0 (Release). Owner look gate owed: night
and rain fog are now retail's shorter authored ranges.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-08-23 13:42:42 +02:00
parent 517d17b4b3
commit cc42edc8e3
11 changed files with 180 additions and 62 deletions
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7
tests/AcDream.App.Tests/Rendering/Gpu/Vk/VulkanShaderManifestTests.cs
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@ -47,7 +47,12 @@ public sealed class VulkanShaderManifestTests
["particle_mesh.vert.spv"] = "f7fe8b203cadcd4d54af5cdbcfd9d5bf733146e10bafa78ca730fb6970db0479",
["portal_depth.frag.spv"] = "96755196d4d0da7be4792107557465778be2ebefb5584834cc75bf90ec55a6cc",
["portal_depth.vert.spv"] = "cd113860b7acd6afad3ebcc0a68dd7147f6baae729df51ab360c123588dc3ae2",
["sky.frag.spv"] = "ae0d9e3e1e1b5742dd986cb39c62ea6e71e19783feea8b86a5cd940504d6047e",
// sky.frag re-pinned 2026-08-23: the dome's fog blend lost its
// 0.2 floor and is now applied only under an AdminEnvirons fog
// override, retail's GameSky::Draw @0x00506FF0 rule (see
// SkyFogRuleTests). A deliberate default-path change, reviewed
// with the world-fog-range fix in the same commit.
["sky.frag.spv"] = "b3b544829f2dd85be04b6b16d78a0490e1fe7884590cb541b95756b7d7511620",
["sky.vert.spv"] = "77176cf33c761ee4e9730357895c941dbf5949d8e0d28e0bb0dcde87f4d30288",
["terrain_modern.frag.spv"] = "7b3cdb01b837ed77ee20559a81c1ce5c9d5395300efcc072560ab0be3c5a1af9",
["terrain_modern.vert.spv"] = "9f4cb221ea6aed94a8d23af6cb8e3f3ed96c3cce6e50d135a72d3b55667b1557",