From ea163c157bd30e4c54fa917ffe0465f5a6d1c663 Mon Sep 17 00:00:00 2001
From: salmonik <salmonik@tuta.io>
Date: Mon, 26 Oct 2026 16:15:22 +0100
Subject: ESP: skeleton ESP

- render parent->child bone links from the SetupBones world matrices
  (ISurface DrawLine, projected once per bone)
- menu option "Show skeleton" under ESP, persisted as skeleton=1
- skeletons use the same hostile/friendly/neutral colours as the boxes
---
 src/esp.cpp  | 38 +++++++++++++++++++++++++++++++++++++-
 src/hl2h.h   |  3 ++-
 src/menu.cpp | 10 +++++++---
 3 files changed, 46 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/esp.cpp b/src/esp.cpp
index 996a886..b75a7a9 100644
--- a/src/esp.cpp
+++ b/src/esp.cpp
@@ -11,7 +11,7 @@ static constexpr float PI_F = 3.14159265358979323846f;
 // ISurface slots (binary = SDK header + 4, disassembly-confirmed)
 enum SurfSlot {
   SURF_DrawSetColor = 10, SURF_FilledRect = 12, SURF_OutlinedRect = 14,
-  SURF_GetScreenSize = 38,
+  SURF_DrawLine = 15, SURF_GetScreenSize = 38,
 };
 
 enum { LIFE_ALIVE = 0 };
@@ -271,6 +271,37 @@ static void surf_color(int r, int g, int b, int a) {
   using Fn = void (*)(void *, int, int, int, int);
   vfunc<Fn>(g_surface, SURF_DrawSetColor)(g_surface, r, g, b, a);
 }
+static void surf_line(int x0, int y0, int x1, int y1) {
+  using Fn = void (*)(void *, int, int, int, int);
+  vfunc<Fn>(g_surface, SURF_DrawLine)(g_surface, x0, y0, x1, y1);
+}
+
+// Draw the parent->child bone links. Bone snapshots are world-space matrices
+// from SetupBones; project each bone once and reuse for both endpoints.
+static void draw_skeleton(const EspTarget &t) {
+  int n = bones_count(t.idx);
+  if (n <= 0 || n > 256)
+    return;
+  Vector wp[256];
+  float xs[256], ys[256];
+  bool ok[256];
+  for (int i = 0; i < n; i++) {
+    ok[i] = bone_pos(t.idx, i, wp[i]) &&
+            world_to_screen(wp[i], xs[i], ys[i]) && std::isfinite(xs[i]) &&
+            std::isfinite(ys[i]);
+  }
+  if (t.friendly)
+    surf_color(60, 255, 60, 255);
+  else if (t.neutral)
+    surf_color(220, 220, 220, 255);
+  else
+    surf_color(255, 60, 60, 255);
+  for (int i = 0; i < n; i++) {
+    int p = bone_parent(t.idx, i);
+    if (p >= 0 && p < n && ok[i] && ok[p])
+      surf_line((int)xs[p], (int)ys[p], (int)xs[i], (int)ys[i]);
+  }
+}
 
 void esp_draw() {
   if (!g_surface || !g_iface.entitylist || !g_net.esp_ok()) return;
@@ -285,6 +316,11 @@ void esp_draw() {
     const EspTarget &t = g_targets[i];
     if (t.neutral && !esp_option(ESP_OPT_SHOW_NEUTRAL))
       continue;
+    if (esp_option(ESP_OPT_SHOW_SKELETON)) {
+      void *ent = entitylist_get(t.idx);
+      if (ent && bones_update(t.idx, ent))
+        draw_skeleton(t);
+    }
     if (t.friendly) surf_color(60, 255, 60, 255);
     else if (t.neutral) surf_color(220, 220, 220, 255);
     else surf_color(255, 60, 60, 255);
diff --git a/src/hl2h.h b/src/hl2h.h
index 68d5d55..1eaee10 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -141,7 +141,8 @@ enum EspOption {
   ESP_OPT_SHOW_HEALTHBAR = 1,
   ESP_OPT_SHOW_HEALTHNUM = 2,
   ESP_OPT_SHOW_NAME = 3,
-  ESP_OPT_COUNT = 4
+  ESP_OPT_SHOW_SKELETON = 4,
+  ESP_OPT_COUNT = 5
 };
 
 // ---------------------------------------------------------------------------
diff --git a/src/menu.cpp b/src/menu.cpp
index 6244002..6474d69 100644
--- a/src/menu.cpp
+++ b/src/menu.cpp
@@ -59,7 +59,7 @@ static FeatureState g_esp{true, 0};
 
 // ESP sub-options (menu "ESP" children). Defaults match the pre-option
 // behaviour: everything on.
-static bool g_esp_opt[ESP_OPT_COUNT] = {true, true, true, true};
+static bool g_esp_opt[ESP_OPT_COUNT] = {true, true, true, true, true};
 
 // tree
 static MenuNode g_root{NODE_ROOT, "HL2hake", false, 0, {}, nullptr, nullptr, nullptr};
@@ -75,6 +75,7 @@ static MenuNode g_esp_opt_nodes[ESP_OPT_COUNT] = {
     {NODE_TOGGLE, "Show healthbar", false, 0, {}, &g_esp_opt[ESP_OPT_SHOW_HEALTHBAR], nullptr, nullptr},
     {NODE_TOGGLE, "Show healthnum", false, 0, {}, &g_esp_opt[ESP_OPT_SHOW_HEALTHNUM], nullptr, nullptr},
     {NODE_TOGGLE, "Show name", false, 0, {}, &g_esp_opt[ESP_OPT_SHOW_NAME], nullptr, nullptr},
+    {NODE_TOGGLE, "Show skeleton", false, 0, {}, &g_esp_opt[ESP_OPT_SHOW_SKELETON], nullptr, nullptr},
 };
 
 static MenuNode *g_visible[32]; // flattened visible nodes for arrow navigation
@@ -159,10 +160,11 @@ static void config_save() {
           g_bhop.bind, g_bhop_autostrafe);
   fprintf(f, "[abh]\nactive=%d\nbind=%d\n", g_abh.active, g_abh.bind);
   fprintf(f, "[esp]\nactive=%d\nbind=%d\nneutral=%d\nhealthbar=%d\n"
-             "healthnum=%d\nname=%d\n",
+             "healthnum=%d\nname=%d\nskeleton=%d\n",
           g_esp.active, g_esp.bind, g_esp_opt[ESP_OPT_SHOW_NEUTRAL],
           g_esp_opt[ESP_OPT_SHOW_HEALTHBAR],
-          g_esp_opt[ESP_OPT_SHOW_HEALTHNUM], g_esp_opt[ESP_OPT_SHOW_NAME]);
+          g_esp_opt[ESP_OPT_SHOW_HEALTHNUM], g_esp_opt[ESP_OPT_SHOW_NAME],
+          g_esp_opt[ESP_OPT_SHOW_SKELETON]);
   fclose(f);
 }
 
@@ -204,6 +206,8 @@ static void config_load() {
           g_esp_opt[ESP_OPT_SHOW_HEALTHNUM] = atoi(val) != 0;
         else if (strcmp(key, "name") == 0)
           g_esp_opt[ESP_OPT_SHOW_NAME] = atoi(val) != 0;
+        else if (strcmp(key, "skeleton") == 0)
+          g_esp_opt[ESP_OPT_SHOW_SKELETON] = atoi(val) != 0;
       }
       if (strcmp(key, "active") == 0)
         cur->active = atoi(val) != 0;
-- 
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