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, 9 insertions, 2 deletions

diff --git a/src/menu.cpp b/src/menu.cpp
index 248aa48..033c0f9 100644
--- a/src/menu.cpp
+++ b/src/menu.cpp
@@ -82,6 +82,7 @@ bool g_edge_jump = false;
 int g_fov_camera = 75;    // HL2's stock camera FOV
 int g_fov_viewmodel = 54; // HL2's stock viewmodel FOV
 int g_gamma = 22;       // mat_monitorgamma x10, stock 2.2
+int g_tonemap = 0;      // mat_force_tonemap_scale x10, 0 = automatic
 int g_esp_col_hostile[3] = {255, 60, 60};
 int g_esp_col_neutral[3] = {220, 220, 220};
 int g_esp_col_friendly[3] = {60, 255, 60};
@@ -248,8 +249,8 @@ void config_save() {
           g_esp_col_neutral[0], g_esp_col_neutral[1], g_esp_col_neutral[2],
           g_esp_col_friendly[0], g_esp_col_friendly[1],
           g_esp_col_friendly[2]);
-  fprintf(f, "[view]\nfov=%d\nvmfov=%d\ngamma=%d\n", g_fov_camera,
-          g_fov_viewmodel, g_gamma);
+  fprintf(f, "[view]\nfov=%d\nvmfov=%d\ngamma=%d\ntonemap=%d\n",
+          g_fov_camera, g_fov_viewmodel, g_gamma, g_tonemap);
   fprintf(f, "[movement]\ncrouchjump=%d\nedgejump=%d\n",
           (int)g_auto_crouchjump, (int)g_edge_jump);
   gui_config_write(f);
@@ -409,6 +410,11 @@ static bool config_load() {
           lo = 16;
           hi = 26; // the engine clamps mat_monitorgamma at 2.6
           stock = 22;
+        } else if (strcmp(key, "tonemap") == 0) {
+          dst = &g_tonemap;
+          lo = 0;
+          hi = 30;
+          stock = 0;
         }
         if (dst) {
           int v = atoi(val);
@@ -605,6 +611,7 @@ void config_reset_defaults() {
   g_fov_camera = 75;
   g_fov_viewmodel = 54;
   g_gamma = 22;
+  g_tonemap = 0;
   g_esp_col_hostile[0] = 255;
   g_esp_col_hostile[1] = 60;
   g_esp_col_hostile[2] = 60;