Silent aim: restore view at FRAME_RENDER_START; preserve movement

- hook CHLClient::FrameStageNotify (vtable slot 35) and at FRAME_RENDER_START
  re-apply the player's original view angles after the engine has consumed the
  aimed usercmd; this fixes the slow pull with high-RPM weapons and the
  revolver leaving the view on the target
- silent aim also rewrites forwardmove/sidemove so the world-space movement
  wish vector is unchanged by the temporary aim angles

1 files changed, 20 insertions, 2 deletions

diff --git a/src/esp.cpp b/src/esp.cpp
index f7c24ce..cd0ff36 100644
--- a/src/esp.cpp
+++ b/src/esp.cpp
@@ -526,6 +526,21 @@ bool aimbot_apply(CUserCmd *cmd) {
   return true;
 }
 
+// Keep the world-space movement wish direction unchanged when the usercmd
+// view angles are temporarily replaced by the silent-aim angles.
+static void preserve_movement(CUserCmd *cmd, float old_yaw, float new_yaw) {
+  float oy = old_yaw * PI_F / 180.0f;
+  float ay = new_yaw * PI_F / 180.0f;
+  float ofx = cosf(oy), ofy = sinf(oy);
+  float orx = sinf(oy), ory = -cosf(oy);
+  float afx = cosf(ay), afy = sinf(ay);
+  float arx = sinf(ay), ary = -cosf(ay);
+  float wx = ofx * cmd->forwardmove + orx * cmd->sidemove;
+  float wy = ofy * cmd->forwardmove + ory * cmd->sidemove;
+  cmd->forwardmove = wx * afx + wy * afy;
+  cmd->sidemove = wx * arx + wy * ary;
+}
+
 bool silent_aim_apply(CUserCmd *cmd) {
   unsigned bone_mask = aimbot_bone_mask();
   if (!bone_mask)
@@ -546,12 +561,15 @@ bool silent_aim_apply(CUserCmd *cmd) {
   while (ny > 180.0f) ny -= 360.0f;
   while (ny < -180.0f) ny += 360.0f;
 
+  preserve_movement(cmd, orig.y, ny);
+
   cmd->viewangles[0] = np;
   cmd->viewangles[1] = ny;
   cmd->viewangles[2] = orig.z;
 
-  // The usercmd keeps the aim angles (shot/prediction); the rendered camera
-  // is restored to where the player was actually looking.
+  // Restore now and again at FRAME_RENDER_START (after the engine consumed
+  // the aimed usercmd); the frame-stage restore is the one that sticks.
+  set_silent_restore(orig);
   if (g_iface.engine) {
     QAngle restore{orig.x, orig.y, orig.z};
     using SetViewFn = void (*)(void *, QAngle *);