1 files changed, 62 insertions, 0 deletions

diff --git a/src/overlay.h b/src/overlay.h
new file mode 100644
index 0000000..6cf86c9
--- /dev/null
+++ b/src/overlay.h
@@ -0,0 +1,62 @@
+#ifndef HL2H_OVERLAY_H
+#define HL2H_OVERLAY_H
+
+#include <cstdint>
+
+// VGUI_Surface030 vtable slots, confirmed against the shipped
+// vguimatsurface.so. This header is the only place that knows them; every
+// consumer goes through the functions below.
+enum SurfaceSlot {
+  SURF_GetEmbeddedPanel = 6,
+  SURF_PushMakeCurrent = 8,
+  SURF_PopMakeCurrent = 9,
+  SURF_DrawSetColor = 10,
+  SURF_DrawFilledRect = 12,
+  SURF_DrawOutlinedRect = 14,
+  SURF_DrawLine = 15,
+  SURF_DrawSetTextFont = 17,
+  SURF_DrawSetTextColor = 18,
+  SURF_DrawSetTextPos = 20,
+  SURF_DrawPrintText = 22,
+  SURF_GetScreenSize = 38,
+  SURF_CreateFont = 66,
+  SURF_AddGlyphSetToFont = 67,
+  SURF_GetTextSize = 75
+};
+
+using HFont = unsigned long;
+
+struct ISurface;
+
+// Set once by install_menu(); every wrapper below is a no-op while it is null.
+extern ISurface *g_surface;
+
+void overlay_color(int r, int g, int b, int a);
+void overlay_fill(int x0, int y0, int x1, int y1);
+void overlay_outline_rect(int x0, int y0, int x1, int y1);
+void overlay_line(int x0, int y0, int x1, int y1);
+void overlay_text_font(HFont f);
+void overlay_text_color(int r, int g, int b, int a);
+void overlay_text_pos(int x, int y);
+void overlay_print_text(const wchar_t *text, int count, int draw_type = 0);
+HFont overlay_create_font();
+bool overlay_add_glyph_set(HFont f, const char *name, int tall, int weight,
+                           int blur, int scanlines, int flags, int range_min,
+                           int range_max);
+void overlay_screen_size(int &w, int &h);
+void overlay_text_size(HFont f, const wchar_t *text, int &w, int &h);
+int overlay_embedded_panel();
+void overlay_push_make_current(int panel, bool use_insets);
+void overlay_pop_make_current(int panel);
+
+// Per-frame draw budget. The engine calls PaintTraverseEx for every panel, and
+// DrawPrintText for every text draw, so the overlay must be collapsed to one
+// draw per frame. A timer cannot do that: panels spaced a few ms apart in the
+// same frame would draw twice and double the alpha of translucent elements.
+// overlay_frame_mark() is called from FRAME_RENDER_START, which is the real
+// frame boundary; if that stops arriving (menu/pause) a 10 ms fallback keeps
+// the GUI repainting.
+void overlay_frame_mark();
+bool overlay_should_draw();
+
+#endif