Chams: material styles and viewmodel support

- Material selector 0..4: debugwhite, debug wireframe (ignorez), vgui
  white_additive, debugtranslucentsinglecolor, vgui/white; cached per index
  with a debugwhite fallback.
- Add "Viewmodel (hands/weapon)" toggle; viewmodel entities (class contains
  viewmodel or model path /v_...) get a normal-depth chams pass.
- [chams] gains viewmodel= and material=.

1 files changed, 38 insertions, 20 deletions

diff --git a/src/studio.cpp b/src/studio.cpp
index a1aae12..e667c4b 100644
--- a/src/studio.cpp
+++ b/src/studio.cpp
@@ -197,15 +197,29 @@ void *g_modelrender = nullptr;
 ModelExecFn g_orig_model_exec = nullptr;
 ForceOverrideFn g_force_override = nullptr;
 void *g_chams_mat = nullptr;
-bool g_chams_mat_tried = false;
+int g_chams_mat_idx = -1;
+
+const char *chams_material_name(int idx) {
+  switch (idx) {
+  case 1: return "debug/debugwireframevertexcolorignorez";
+  case 2: return "vgui/white_additive";
+  case 3: return "debug/debugtranslucentsinglecolor";
+  case 4: return "vgui/white";
+  default: return "models/debug/debugwhite";
+  }
+}
 
 void *chams_material() {
-  if (g_chams_mat_tried)
+  int idx = g_chams_mat_index;
+  if (idx < 0) idx = 0;
+  if (idx > 4) idx = 4;
+  if (g_chams_mat && g_chams_mat_idx == idx)
     return g_chams_mat;
-  g_chams_mat_tried = true;
-  g_chams_mat = world_find_material("models/debug/debugwhite");
+  g_chams_mat = world_find_material(chams_material_name(idx));
   if (!g_chams_mat)
-    logf("chams: no usable material");
+    g_chams_mat = world_find_material("models/debug/debugwhite");
+  g_chams_mat_idx = idx;
+  logf("chams: style %d -> %p", idx, g_chams_mat);
   return g_chams_mat;
 }
 
@@ -239,23 +253,27 @@ void hkdModelExecute(void *self, const void *state, const void *info,
   if (feature_active(FEAT_CHAMS) && info && g_force_override) {
     // ModelRenderInfo_t::entity_index is at 0x30 on 32-bit.
     int idx = *(const int *)((const char *)info + 0x30);
-    if (idx > 0 && idx <= 8192 && esp_is_npc_index(idx)) {
-      void *mat = chams_material();
-      if (mat) {
-        if (g_chams_walls) {
-          chams_apply(mat, true);
-          g_force_override(self, mat, 0 /* OVERRIDE_NORMAL */);
+    if (idx > 0 && idx <= 8192) {
+      bool is_npc = esp_is_npc_index(idx);
+      bool is_vm = g_chams_viewmodel && esp_is_viewmodel_index(idx);
+      if (is_npc || is_vm) {
+        void *mat = chams_material();
+        if (mat) {
+          if (g_chams_walls && !is_vm) {
+            chams_apply(mat, true);
+            g_force_override(self, mat, 0 /* OVERRIDE_NORMAL */);
+            g_orig_model_exec(self, state, info, bone);
+          }
+          chams_apply(mat, false);
+          g_force_override(self, mat, 0);
           g_orig_model_exec(self, state, info, bone);
+          g_force_override(self, nullptr, 0);
+          // debugwhite is shared: restore colour and depth behaviour.
+          using FlagFn = void (*)(void *, int, bool);
+          vfunc<FlagFn>(mat, 29)(mat, 1 << 15, false);
+          chams_color(mat, 1.0f, 1.0f, 1.0f);
+          return;
         }
-        chams_apply(mat, false);
-        g_force_override(self, mat, 0);
-        g_orig_model_exec(self, state, info, bone);
-        g_force_override(self, nullptr, 0);
-        // debugwhite is shared: restore colour and depth behaviour.
-        using FlagFn = void (*)(void *, int, bool);
-        vfunc<FlagFn>(mat, 29)(mat, 1 << 15, false);
-        chams_color(mat, 1.0f, 1.0f, 1.0f);
-        return;
       }
     }
   }