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

1 files changed, 37 insertions, 1 deletions

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);