World tint: tint map-static props through IStudioRender

Most of the crates are prop_static, which have no client entity, so writing
m_clrRender only reached the three dynamic ones. Hook the StudioRender
interface (VStudioRender025) on the interface object's vtable: substitute the
prop colour in SetColorModulation/SetAlphaModulation while
DrawModelStaticProp is drawing a models/props model, and set the modulation
explicitly before the original draw in case the engine sets it just before the
call.

Vtable indices verified by disassembling CStudioRenderContext: 27 = three
float stores from the argument pointer, 28 = one float, 30 = the
DrawModelInfo_t-drawing entry with three arguments (the 2013 SDK header lists
these slots five positions earlier in this build).

1 files changed, 2 insertions, 0 deletions

diff --git a/src/esp.cpp b/src/esp.cpp
index 9d041b0..67fbad2 100644
--- a/src/esp.cpp
+++ b/src/esp.cpp
@@ -1413,6 +1413,8 @@ void prop_tint_update() {
   static bool logged_missing = false;
   static bool logged_touched = false;
   bool on = feature_active(FEAT_WORLD_TINT) && g_tint_prop_on;
+  if (on)
+    studio_props_init();
   if (!on && !applied)
     return;
   if (!g_iface.entitylist || g_net.clr_render < 0) {