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movement: fix jumpXYSpeed to be 0 when jumping in place

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jumpXYSpeed should reflect actual horizontal movement at jump time:
- non-zero (run/walk speed) only when movement flags indicate forward/
  backward/strafe movement
- zero when jumping straight up without horizontal movement

This prevents the server from thinking the player launched with full run
speed when they jumped in place, which could affect position prediction.
This commit is contained in:
Kelsi 2026-03-10 12:37:53 -07:00
parent 4cf73a6def
commit 9291637977
1 changed files with 13 additions and 3 deletions
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16
src/game/game_handler.cpp
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@ -7248,9 +7248,19 @@ void GameHandler::sendMovement(Opcode opcode) {
const float facingRad = movementInfo.orientation;
movementInfo.jumpCosAngle = std::cos(facingRad);
movementInfo.jumpSinAngle = std::sin(facingRad);
// Use server run speed as the horizontal speed at jump time.
const bool isWalking = (movementInfo.flags & static_cast<uint32_t>(MovementFlags::WALKING)) != 0;
movementInfo.jumpXYSpeed = isWalking ? 2.5f : (serverRunSpeed_ > 0.0f ? serverRunSpeed_ : 7.0f);
// Horizontal speed: only non-zero when actually moving at jump time.
const uint32_t horizFlags =
static_cast<uint32_t>(MovementFlags::FORWARD) |
static_cast<uint32_t>(MovementFlags::BACKWARD) |
static_cast<uint32_t>(MovementFlags::STRAFE_LEFT) |
static_cast<uint32_t>(MovementFlags::STRAFE_RIGHT);
const bool movingHoriz = (movementInfo.flags & horizFlags) != 0;
if (movingHoriz) {
const bool isWalking = (movementInfo.flags & static_cast<uint32_t>(MovementFlags::WALKING)) != 0;
movementInfo.jumpXYSpeed = isWalking ? 2.5f : (serverRunSpeed_ > 0.0f ? serverRunSpeed_ : 7.0f);
} else {
movementInfo.jumpXYSpeed = 0.0f;
}
}
break;
case Opcode::MSG_MOVE_START_TURN_LEFT: