Chams: make Fullbright a white-hot additive glow

Fullbright was additive with the chosen colour lifted only 25% toward white,
which on a dark scene looked almost identical to Solid/Flat. Force white for
the Fullbright colour so the additive pass reads as a distinctly brighter,
white-hot glow; the faint translucent base still gives it a silhouette on
bright backgrounds.

2 files changed, 3 insertions, 12 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index 1bb0a6a..bfb0d8e 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -304,7 +304,8 @@ vocabulary / decisions.
   `$color`) and material flags:
   0 Flat (solid + FLAT), 1 Wireframe (`debug/debugwireframe`), 2 Additive
   (+ ADDITIVE), 3 Solid, 4 White (colour forced white), 5 Fullbright
-  (ADDITIVE|SELFILLUM with the colour lifted toward white), 6 Glow outline
+  (ADDITIVE|SELFILLUM, colour forced white so it reads as a white-hot glow
+  instead of matching Solid), 6 Glow outline
   (solid plus a `debug/debugwireframe` contour pass drawn with ZNEARER
   (1 << 10) and a brightened colour so the base cannot bury it).
   `vgui/white` is vertex-colour based and has no `$model`/`$basetexture`, so it
diff --git a/src/studio.cpp b/src/studio.cpp
index 07ebec3..086d213 100644
--- a/src/studio.cpp
+++ b/src/studio.cpp
@@ -315,18 +315,8 @@ void hkdModelExecute(void *self, const void *state, const void *info,
           void *mat = style_material(style);
           if (!mat)
             return false;
-          bool white = style == 4;
-          // Fullbright is an additive, self-illuminated version of the
-          // chosen colour: lift it toward white so it reads brighter than
-          // the plain additive style.
-          int brgb[4];
+          bool white = style == 4 || style == 5;
           const int *use_rgb = rgb;
-          if (style == 5) {
-            for (int i = 0; i < 3; i++)
-              brgb[i] = rgb[i] + (255 - rgb[i]) / 4;
-            brgb[3] = rgb[3];
-            use_rgb = brgb;
-          }
           // Additive blending vanishes against bright backgrounds (sky,
           // white walls, strong fog), which made the viewmodel disappear in
           // some places. Lay down a faint translucent base so the first-person