Transitions: per-trigger targets and 3D wireframe; FOV range fixes

- Each changelevel trigger now shows its own target map. The trigger whose
  target is the map we came from is marked "<- map"; the forward one is
  "-> map". No more appending one global previous-map line to every box.
- Draw the volume as a projected 8-corner / 12-edge wireframe with the tag
  above its highest visible corner instead of a screen-space rectangle.
- Camera FOV is 40..140 (stock 75) and viewmodel FOV 20..120 (stock 54); 0 is
  no longer allowed and old configs using 0 migrate to the stock value.
- Log the mat_monitorgamma readback via ICvar so we can tell whether the
  command is rejected or the OS/compositor ignores the gamma ramp.

1 files changed, 12 insertions, 5 deletions

diff --git a/src/menu.cpp b/src/menu.cpp
index 4e521f7..ead5f2d 100644
--- a/src/menu.cpp
+++ b/src/menu.cpp
@@ -79,8 +79,8 @@ bool g_aim_punch = true;  // compensate server aim punch
 bool g_spread_engine = true; // zero the pellet random draws, not just the seed
 bool g_auto_crouchjump = false;
 bool g_edge_jump = false;
-int g_fov_camera = 0;   // 0 = game default
-int g_fov_viewmodel = 0; // 0 = game default (54)
+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_esp_col_hostile[3] = {255, 60, 60};
 int g_esp_col_neutral[3] = {220, 220, 220};
@@ -393,20 +393,27 @@ static bool config_load() {
       }
       if (in_view) {
         int *dst = nullptr;
-        int lo = 0, hi = 0;
+        int lo = 0, hi = 0, stock = 0;
         if (strcmp(key, "fov") == 0) {
           dst = &g_fov_camera;
+          lo = 40;
           hi = 140;
+          stock = 75;
         } else if (strcmp(key, "vmfov") == 0) {
           dst = &g_fov_viewmodel;
+          lo = 20;
           hi = 120;
+          stock = 54;
         } else if (strcmp(key, "gamma") == 0) {
           dst = &g_gamma;
           lo = 16;
           hi = 30;
+          stock = 22;
         }
         if (dst) {
           int v = atoi(val);
+          if (v <= 0)
+            v = stock; // old configs used 0 as "off"
           if (v < lo) v = lo;
           if (v > hi) v = hi;
           *dst = v;
@@ -595,8 +602,8 @@ void config_reset_defaults() {
   g_spread_engine = true;
   g_auto_crouchjump = false;
   g_edge_jump = false;
-  g_fov_camera = 0;
-  g_fov_viewmodel = 0;
+  g_fov_camera = 75;
+  g_fov_viewmodel = 54;
   g_gamma = 22;
   g_esp_col_hostile[0] = 255;
   g_esp_col_hostile[1] = 60;