Chams: tint through $color/$color2 and log the chosen material

ColorModulate alone left the forced material white. Also set the shader's
$color and $color2 vars (IMaterialVar SetVecValue 3-float) and restore them to
white after the draw. Log which fallback material was selected.

3 files changed, 31 insertions, 11 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index 1fe24a0..60a5a91 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -287,11 +287,16 @@ vocabulary / decisions.
 - Uses `IVModelRender::ForcedMaterialOverride` (slot 1) with
   `models/debug/debugwhite` and draws twice: first with
   `MATERIAL_VAR_IGNOREZ` (1 << 15) set through `IMaterial::SetMaterialVarFlag`
-  (slot 29) for the through-wall pass, then without it. `IMaterial::
-  ColorModulate` (slot 28) applies the configured colour. The shared material's
-  flag and colour are restored to (false, white) after the draw.
+  (slot 29) for the through-wall pass, then without it. Colour is applied via
+  `IMaterial::ColorModulate` (slot 28) **and** the shader's `$color`/`$color2`
+  vars (IMaterialVar slot 11, SetVecValue 3-float slot 11), because some forced
+  materials ignore ColorModulate. The shared material's flag and colour are
+  restored to (false, white) after the draw.
 - Material lookup walks the `IMaterialSystem` list (`world_find_material`), with
-  `FindMaterial` (slot 71) as the fallback for a not-yet-resident material.
+  `FindMaterial` (slot 71) as the fallback. Candidates, in order:
+  `models/debug/debugwhite{2,3}`, `vgui/white`,
+  `debug/debugtranslucentsinglecolor`, `debug/debugwireframevertexcolorignorez`.
+  The chosen material name is logged.
 - Feature is off by default; `[chams] active/bind/walls/r/g/b`, with a
   "Through walls" toggle and colour picker in the Visuals card.
 - This is a flat material override, not stencil outlines; depth handling is
diff --git a/src/studio.cpp b/src/studio.cpp
index 1b7b77d..d472fbc 100644
--- a/src/studio.cpp
+++ b/src/studio.cpp
@@ -211,12 +211,26 @@ void *chams_material() {
   return g_chams_mat;
 }
 
-void chams_apply(void *mat, bool ignorez) {
+void chams_color(void *mat, float r, float g, float b) {
   using ColorFn = void (*)(void *, float, float, float);
+  using FindVarFn = void *(*)(void *, const char *, bool *, bool);
+  using SetVec3Fn = void (*)(void *, float, float, float);
+  bool found = false;
+  void *var = vfunc<FindVarFn>(mat, 11)(mat, "$color", &found, false);
+  if (var)
+    vfunc<SetVec3Fn>(var, 11)(var, r, g, b);
+  found = false;
+  var = vfunc<FindVarFn>(mat, 11)(mat, "$color2", &found, false);
+  if (var)
+    vfunc<SetVec3Fn>(var, 11)(var, r, g, b);
+  vfunc<ColorFn>(mat, 28)(mat, r, g, b);
+}
+
+void chams_apply(void *mat, bool ignorez) {
   using FlagFn = void (*)(void *, int, bool);
-  vfunc<ColorFn>(mat, 28)(mat, (float)g_chams_rgb[0] / 255.0f,
-                          (float)g_chams_rgb[1] / 255.0f,
-                          (float)g_chams_rgb[2] / 255.0f);
+  chams_color(mat, (float)g_chams_rgb[0] / 255.0f,
+              (float)g_chams_rgb[1] / 255.0f,
+              (float)g_chams_rgb[2] / 255.0f);
   vfunc<FlagFn>(mat, 29)(mat, 1 << 15 /* MATERIAL_VAR_IGNOREZ */, ignorez);
 }
 
@@ -240,10 +254,9 @@ void hkdModelExecute(void *self, const void *state, const void *info,
         g_orig_model_exec(self, state, info, bone);
         g_force_override(self, nullptr, 0);
         // debugwhite is shared: restore colour and depth behaviour.
-        using ColorFn = void (*)(void *, float, float, float);
         using FlagFn = void (*)(void *, int, bool);
         vfunc<FlagFn>(mat, 29)(mat, 1 << 15, false);
-        vfunc<ColorFn>(mat, 28)(mat, 1.0f, 1.0f, 1.0f);
+        chams_color(mat, 1.0f, 1.0f, 1.0f);
         return;
       }
     }
diff --git a/src/world.cpp b/src/world.cpp
index 15a93ec..284e64e 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -1038,8 +1038,10 @@ void *world_find_material(const char *name) {
         const char *n = mat_name(mat);
         if (n) {
           for (int c = 0; candidates[c]; c++)
-            if (strcmp(n, candidates[c]) == 0)
+            if (strcmp(n, candidates[c]) == 0) {
+              logf("chams: material %s = %p", n, mat);
               return mat;
+            }
         }
       }
       h = next(ms, h);