Chams: per-colour alpha and a softer viewmodel additive base

- Colour picker gains an optional alpha bar (checkerboard preview, #RRGGBBAA
  readout); add_color_alpha is used for the chams colours. Chams colours are
  now r,g,b,a and chams_apply sets $alpha plus MATERIAL_VAR_TRANSLUCENT when
  alpha < 255. Config stores vis_a / inv_a / vm a.
- The additive viewmodel base is now a faint translucent tint (alpha/8)
  instead of an opaque fill, so additive/Fullbright stay see-through and the
  viewmodel no longer becomes a solid blob. Fullbright whitening reduced to
  25% so blue stays blue instead of turning lavender.

1 files changed, 32 insertions, 18 deletions

diff --git a/src/menu.cpp b/src/menu.cpp
index bdb9531..873f5ed 100644
--- a/src/menu.cpp
+++ b/src/menu.cpp
@@ -64,12 +64,15 @@ FeatureState g_projectiles{true, 0}; // grenade / rocket ESP
 bool g_proj_fuse = true;
 bool g_proj_radius = true;
 FeatureState g_chams{false, 0};
-ChamsGroup g_chams_hostile{true, 3, {255, 60, 60}, true, 3, {255, 60, 60}};
-ChamsGroup g_chams_neutral{true, 3, {220, 220, 220}, false, 3, {220, 220, 220}};
-ChamsGroup g_chams_friendly{true, 3, {60, 255, 60}, false, 3, {60, 255, 60}};
+ChamsGroup g_chams_hostile{true, 3, {255, 60, 60, 255}, true, 3,
+                           {255, 60, 60, 255}};
+ChamsGroup g_chams_neutral{true, 3, {220, 220, 220, 255}, false, 3,
+                           {220, 220, 220, 255}};
+ChamsGroup g_chams_friendly{true, 3, {60, 255, 60, 255}, false, 3,
+                            {60, 255, 60, 255}};
 bool g_chams_viewmodel = false;
 int g_chams_vm_mat = 3;
-int g_chams_vm_rgb[3] = {200, 200, 255};
+int g_chams_vm_rgb[4] = {200, 200, 255, 255};
 bool g_item_health = true;
 bool g_item_ammo = true;
 bool g_item_armor = true;
@@ -244,17 +247,18 @@ void config_save() {
   fprintf(f, "[chams]\nactive=%d\nbind=%d\n", g_chams.active, g_chams.bind);
   auto save_chams = [&](const char *name, const ChamsGroup &g) {
     fprintf(f, "[%s]\nvis=%d\nvis_mat=%d\nvis_r=%d\nvis_g=%d\nvis_b=%d\n"
-               "inv=%d\ninv_mat=%d\ninv_r=%d\ninv_g=%d\ninv_b=%d\n",
+               "vis_a=%d\ninv=%d\ninv_mat=%d\ninv_r=%d\ninv_g=%d\ninv_b=%d\n"
+               "inv_a=%d\n",
             name, (int)g.vis_on, g.vis_mat, g.vis_rgb[0], g.vis_rgb[1],
-            g.vis_rgb[2], (int)g.inv_on, g.inv_mat, g.inv_rgb[0],
-            g.inv_rgb[1], g.inv_rgb[2]);
+            g.vis_rgb[2], g.vis_rgb[3], (int)g.inv_on, g.inv_mat,
+            g.inv_rgb[0], g.inv_rgb[1], g.inv_rgb[2], g.inv_rgb[3]);
   };
   save_chams("chams_hostile", g_chams_hostile);
   save_chams("chams_neutral", g_chams_neutral);
   save_chams("chams_friendly", g_chams_friendly);
-  fprintf(f, "[chams_vm]\non=%d\nmat=%d\nr=%d\ng=%d\nb=%d\n",
+  fprintf(f, "[chams_vm]\non=%d\nmat=%d\nr=%d\ng=%d\nb=%d\na=%d\n",
           (int)g_chams_viewmodel, g_chams_vm_mat, g_chams_vm_rgb[0],
-          g_chams_vm_rgb[1], g_chams_vm_rgb[2]);
+          g_chams_vm_rgb[1], g_chams_vm_rgb[2], g_chams_vm_rgb[3]);
   fprintf(f, "[items]\nactive=%d\nbind=%d\nhealth=%d\nammo=%d\n"
              "armor=%d\nweapons=%d\ncrates=%d\ndistance=%d\nmax_dist=%d\n"
              "usable=%d\n",
@@ -432,11 +436,13 @@ static bool config_load() {
           if (v > 6) v = 6;
           g.vis_mat = v;
         } else if (strcmp(key, "vis_r") == 0 || strcmp(key, "vis_g") == 0 ||
-                   strcmp(key, "vis_b") == 0) {
+                   strcmp(key, "vis_b") == 0 || strcmp(key, "vis_a") == 0) {
           int v = atoi(val);
           if (v < 0) v = 0;
           if (v > 255) v = 255;
-          g.vis_rgb[key[4] == 'r' ? 0 : key[4] == 'g' ? 1 : 2] = v;
+          int idx = key[4] == 'r' ? 0 : key[4] == 'g' ? 1
+                    : key[4] == 'b' ? 2 : 3;
+          g.vis_rgb[idx] = v;
         } else if (strcmp(key, "inv") == 0)
           g.inv_on = atoi(val) != 0;
         else if (strcmp(key, "inv_mat") == 0) {
@@ -445,11 +451,13 @@ static bool config_load() {
           if (v > 6) v = 6;
           g.inv_mat = v;
         } else if (strcmp(key, "inv_r") == 0 || strcmp(key, "inv_g") == 0 ||
-                   strcmp(key, "inv_b") == 0) {
+                   strcmp(key, "inv_b") == 0 || strcmp(key, "inv_a") == 0) {
           int v = atoi(val);
           if (v < 0) v = 0;
           if (v > 255) v = 255;
-          g.inv_rgb[key[4] == 'r' ? 0 : key[4] == 'g' ? 1 : 2] = v;
+          int idx = key[4] == 'r' ? 0 : key[4] == 'g' ? 1
+                    : key[4] == 'b' ? 2 : 3;
+          g.inv_rgb[idx] = v;
         }
       }
       if (in_chams_vm) {
@@ -461,11 +469,13 @@ static bool config_load() {
           if (v > 6) v = 6;
           g_chams_vm_mat = v;
         } else if (strcmp(key, "r") == 0 || strcmp(key, "g") == 0 ||
-                   strcmp(key, "b") == 0) {
+                   strcmp(key, "b") == 0 || strcmp(key, "a") == 0) {
           int v = atoi(val);
           if (v < 0) v = 0;
           if (v > 255) v = 255;
-          g_chams_vm_rgb[key[0] == 'r' ? 0 : key[0] == 'g' ? 1 : 2] = v;
+          int idx = key[0] == 'r' ? 0 : key[0] == 'g' ? 1
+                    : key[0] == 'b' ? 2 : 3;
+          g_chams_vm_rgb[idx] = v;
         }
       }
       if (in_aim) {
@@ -693,14 +703,18 @@ void config_reset_defaults() {
   g_proj_fuse = true;
   g_proj_radius = true;
   g_chams = {false, 0};
-  g_chams_hostile = {true, 3, {255, 60, 60}, true, 3, {255, 60, 60}};
-  g_chams_neutral = {true, 3, {220, 220, 220}, false, 3, {220, 220, 220}};
-  g_chams_friendly = {true, 3, {60, 255, 60}, false, 3, {60, 255, 60}};
+  g_chams_hostile = {true, 3, {255, 60, 60, 255}, true, 3,
+                     {255, 60, 60, 255}};
+  g_chams_neutral = {true, 3, {220, 220, 220, 255}, false, 3,
+                     {220, 220, 220, 255}};
+  g_chams_friendly = {true, 3, {60, 255, 60, 255}, false, 3,
+                      {60, 255, 60, 255}};
   g_chams_viewmodel = false;
   g_chams_vm_mat = 3;
   g_chams_vm_rgb[0] = 200;
   g_chams_vm_rgb[1] = 200;
   g_chams_vm_rgb[2] = 255;
+  g_chams_vm_rgb[3] = 255;
   g_item_health = true;
   g_item_ammo = true;
   g_item_armor = true;