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* World: replace skybox changer with a PNG skybox imagesalmonik4 days1-99/+243
| | | | | | | | | | | | | | | | | sv_skyname did not take effect at runtime in this build, so the Skybox card now replaces the skybox materials' textures with <config dir>/skybox.png. The PNG is decoded through libpng16's simplified API (dlopen'ed, so no new link dependency) and uploaded with IMaterialSystem::CreateTextureFromBits as an RGBA8888 texture. IMaterialVar::SetTextureValue assigns it to $basetexture and the HDR variants for every material in the SkyBox textures group (all six faces get the same image). Original textures are recorded per material/var (texture pointer plus string fallback) and restored when the feature is off. Records survive level changes so a reused sky material is still restorable; the override is re-applied to a new map automatically. The card shows the image path and has a Reload image button; a missing/unreadable PNG raises an error toast.
* World: add skybox changersalmonik4 days1-0/+152
| | | | | | | | | | | | | | New Visuals -> Skybox card with a runtime sv_skyname override using the same mechanism as the stock skybox_swapper entity. The choice list is the HL2 skybox set extracted from the game VPKs. The map's own sky is captured from loaded materials (SkyBox group, parsing skybox/<name>... face names) before the first override, so turning the feature off or picking "Map default" restores it; a level change restores it implicitly. Sky changes invalidate the world tint so new sky materials are tinted as well. GUI: add a CK_CHOICE control (value box with < / > zones).
* World: add prop tint and fog overridesalmonik4 days1-13/+107
| | | | | | | | | | - World tint now also colours prop materials (models/props*) with their own colour, covering static props and prop_physics while leaving NPC, player and weapon materials untouched. - New Fog card: fog_override colour/start/end via ClientCmd, optional skybox fog, and a Remove fog mode. Restores the map fog (fog_override 0) when disabled and re-applies after level changes. - Config sections [worldtint] prop/colour keys and [fog].
* World: add world/sky material colour modulationsalmonik4 days1-0/+248
Port Amalgam's modulation approach: obtain IMaterialSystem from the already loaded materialsystem.so (VMaterialSystem080) and walk materials with FirstMaterial/NextMaterial/GetMaterial. ColorModulate the "World textures" group (sky names excluded) and the "SkyBox textures"/sky-named group. The walk runs only when the enabled groups or colours change, restores white when disabled, and re-applies after level changes. Before touching materials, GetNumMaterials() and the first material's name/group are sanity-checked so a wrong vtable slot logs and aborts instead of walking garbage. GUI: "World tint" card with world/sky toggles and RGB sliders; config section [worldtint].