Debugging Motion Issues

1#include <SDL.h>
2#include <chrono>
3#include <fstream>
4#include <iostream>
5#include "Window.h"
6
7class MotionDebugger {
8public:
9  MotionDebugger() {
10    // Open log file
11    Log.open("mouse_motion.log");
12
13    // Log system information
14    Log << "SDL Version: " << SDL_MAJOR_VERSION
15      << "." << SDL_MINOR_VERSION
16      << "." << SDL_PATCHLEVEL << '\n';
17
18    // Log relative mode state
19    Log << "Relative Mode: "
20      << (SDL_GetRelativeMouseMode()
21            ? "Enabled"
22            : "Disabled") << '\n';
23  }
24
25  void LogMotionEvent(SDL_MouseMotionEvent& E) {
26    auto Now = std::chrono::system_clock::now();
27    auto Timestamp = std::chrono::duration_cast<
28        std::chrono::milliseconds>(
29        Now.time_since_epoch()).count();
30
31    Log << Timestamp << "," << E.xrel << ","
32      << E.yrel << "," << E.x << "," << E.y <<
33      '\n';
34
35    // Also check for potential issues
36    CheckForAnomalies(E);
37  }
38
39private:
40  void CheckForAnomalies(
41    SDL_MouseMotionEvent& E) {
42    // Check for unusually large movements
43    if (std::abs(E.xrel) > 100
44      || std::abs(E.yrel) > 100) {
45      std::cout << "Warning: Large movement "
46        "detected\n";
47    }
48
49    // Check for stuck positions
50    if (E.x == LastX && E.y == LastY
51      && E.xrel != 0 && E.yrel != 0) {
52      std::cout <<
53        "Warning: Position stuck but "
54        << "relative motion reported\n";
55    }
56
57    LastX = E.x;
58    LastY = E.y;
59  }
60
61  std::ofstream Log;
62  int LastX{0};
63  int LastY{0};
64};
65
66int main() {
67  SDL_Init(SDL_INIT_VIDEO);
68  Window GameWindow;
69  MotionDebugger Debugger;
70
71  // Enable relative mode
72  if (SDL_SetRelativeMouseMode(SDL_TRUE) < 0) {
73    std::cout <<
74      "Failed to enable relative mode: "
75      << SDL_GetError() << '\n';
76  }
77
78  SDL_Event E;
79  while (true) {
80    while (SDL_PollEvent(&E)) {
81      if (E.type == SDL_MOUSEMOTION) {
82        Debugger.LogMotionEvent(E.motion);
83      } else if (E.type == SDL_QUIT) {
84        SDL_Quit();
85        return 0;
86      }
87    }
88    GameWindow.Update();
89    GameWindow.Render();
90  }
91}