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, 1 insertions, 0 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index 779a241..3ccf7b5 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -298,6 +298,7 @@ void draw_text_col(int x, int y, const char *s, int r, int g, int b);
 void esp_draw();
 void esp_draw_items();
 void prop_tint_update();
+void studio_props_init();
 bool world_to_screen(const Vector &w, float &sx, float &sy);
 void set_silent_restore(const QAngle &angles);
 bool is_visible(const Vector &eye, const Vector &point,