Chams: use the model solid shader for flat, drop vgui/white

vgui/white is an UnlitGeneric with $vertexcolor/$vertexalpha, no basetexture
and no $model, so it renders nothing on model vertices; Flat was invisible on
the viewmodel and would be invisible on NPCs too. Flat now uses the solid
model shader with the FLAT flag. Remove the vgui/white probe.

1 files changed, 10 insertions, 11 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index f7fdecb..ad9ce2d 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -295,17 +295,16 @@ vocabulary / decisions.
   `IMaterial::SetMaterialVarFlag` (slot 29); colours use `$color`/`$color2`
   (IMaterialVar slot 11, SetVecValue 3-float slot 11) and `ColorModulate`
   (slot 28). Shared materials are restored after each draw.
-- Styles are built from the resident materials and material flags:
-  0 Flat (`vgui/white` with FLAT on NPCs; the solid model shader with FLAT on
-  the viewmodel, because VGUI materials do not draw skinned models),
-  1 Wireframe (`debug/debugwireframe`), 2 Additive
-  (`debug/debugtranslucentsinglecolor` + ADDITIVE), 3 Solid, 4 White (solid,
-  colour forced white), 5 Fullbright (solid + ADDITIVE|SELFILLUM with the
-  colour lifted toward white), 6 Glow outline (solid plus a
-  `debug/debugwireframe` contour pass drawn with ZNEARER (1 << 10) and a
-  brightened colour so the base cannot bury it). `models/debug/debugwhite` is
-  EP2-only and the old VGUI additive material is invisible on NPCs; the styles
-  no longer depend on them.
+- Styles are built from `debug/debugtranslucentsinglecolor` (UnlitGeneric,
+  `$color`) and material flags:
+  0 Flat (solid + FLAT), 1 Wireframe (`debug/debugwireframe`), 2 Additive
+  (+ ADDITIVE), 3 Solid, 4 White (colour forced white), 5 Fullbright
+  (ADDITIVE|SELFILLUM with the colour lifted toward white), 6 Glow outline
+  (solid plus a `debug/debugwireframe` contour pass drawn with ZNEARER
+  (1 << 10) and a brightened colour so the base cannot bury it).
+  `vgui/white` is vertex-colour based and has no `$model`/`$basetexture`, so it
+  is never used for chams; `models/debug/debugwhite` is EP2-only and the old
+  VGUI additive material was invisible on NPCs.
 - Style materials are preloaded from `outer_draw` (throttled) and cached; the
   render hook never calls FindMaterial itself. A missing style uses solid.
 - Feature is off by default. Config sections: `[chams]` (active/bind),