Add HDR tonemap brightness slider

The engine applies mat_monitorgamma (SDL receives changing ramp midpoints),
but Wayland/XWayland compositors discard the window gamma ramp, so the gamma
slider has no visible effect there. Add an in-engine brightness control that
does not depend on the window system: mat_force_tonemap_scale, exposed as
"HDR brightness" (x10, 0 = automatic). Drop the temporary SDL gamma ramp
diagnostic.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index 6b142c7..a050feb 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -249,6 +249,7 @@ extern bool g_edge_jump;
 extern int g_fov_camera;
 extern int g_fov_viewmodel;
 extern int g_gamma;
+extern int g_tonemap;
 extern int g_esp_col_hostile[3];
 extern int g_esp_col_neutral[3];
 extern int g_esp_col_friendly[3];