Remove gamma slider; keep HDR brightness

Wayland/XWayland discards window gamma ramps, so mat_monitorgamma could not
work on the development setup. Drop the slider, config key and readback.
Keep the in-engine HDR tonemap brightness and document that Fullbright turns
tonemapping off.

1 files changed, 3 insertions, 22 deletions

diff --git a/src/gui.cpp b/src/gui.cpp
index 83dc0a5..59c4364 100644
--- a/src/gui.cpp
+++ b/src/gui.cpp
@@ -411,20 +411,17 @@ static void build_cards() {
   g_ctrls[g_nctrl - 1].zero_unlimited = true;
 
   int view = add_card(2, nullptr, "Camera / display",
-                      "Camera FOV, viewmodel FOV and monitor gamma.", true);
+                      "Camera FOV, viewmodel FOV and HDR brightness.", true);
   add_slider(view, "Camera FOV",
              "World camera field of view (40-140; stock 75).", 40, 140,
              &g_fov_camera);
   add_slider(view, "Viewmodel FOV",
              "Weapon model field of view (20-120; stock 54).", 20, 120,
              &g_fov_viewmodel);
-  add_slider(view, "Gamma x10",
-             "mat_monitorgamma x10: 16 = 1.6, 26 = 2.6 (engine max), stock "
-             "is 22. Uses the OS gamma ramp; some compositors ignore it.",
-             16, 26, &g_gamma);
   add_slider(view, "HDR brightness",
              "mat_force_tonemap_scale x10 (0 = automatic). In-engine "
-             "brightness for HDR maps; 10 = 1.0.",
+             "brightness for HDR maps; 10 = 1.0. No effect while Fullbright "
+             "is on.",
              0, 30, &g_tonemap);
 
   add_card(2, &g_fullbright, "Fullbright",
@@ -2245,22 +2242,6 @@ SDL_WarpMouseGlobal(int x, int y) {
     real_warp_global(x, y);
 }
 
-// Diagnostic: tell whether mat_monitorgamma reaches the SDL gamma ramp at all.
-static int (*real_set_gamma_ramp)(void *, const unsigned short *,
-                                  const unsigned short *,
-                                  const unsigned short *) = nullptr;
-
-extern "C" __attribute__((visibility("default"))) int
-SDL_SetWindowGammaRamp(void *window, const unsigned short *r,
-                       const unsigned short *g, const unsigned short *b) {
-  if (!real_set_gamma_ramp)
-    real_set_gamma_ramp = (int (*)(void *, const unsigned short *,
-                                   const unsigned short *,
-                                   const unsigned short *))dlsym(
-        RTLD_NEXT, "SDL_SetWindowGammaRamp");
-  return real_set_gamma_ramp ? real_set_gamma_ramp(window, r, g, b) : -1;
-}
-
 static unsigned int (*real_get_rel_mouse)(int *, int *) = nullptr;
 static int (*real_poll_event)(void *) = nullptr;