SDL2_WarpMouseInWindow DeathAdder 2013 bug

sdl2warpmouse.cpp

/**
 *
 * This example demonstrates a bug with SDL2 and the Razer DeathAdder 2013
 * mouse on Linux. There might be other configurations where this bug occurs.
 *
 * Press and hold the middle mouse button. This shows a 'Chat wheel' dummy.
 * Move the mouse a bit while holding the middle mouse button.  After releasing
 * the middle mouse button, the cursor position should be restored to its
 * original position.
 *
 * If it does not return to its position, you are affected by this bug.
 *
 * Compile with:
 *
 * g++ -lSDL2 sdl2warpmouse.cpp
 *
 */

#include "SDL2/SDL.h"
#include <iostream>

int main(int, char**)
{
  SDL_Init(SDL_INIT_VIDEO);

  SDL_Renderer* renderer;
  SDL_Window* window;

  if (SDL_CreateWindowAndRenderer(800, 600, SDL_WINDOW_OPENGL, &window, &renderer))
  {
    std::cout << "Could not create window: " << SDL_GetError() << std::endl;
    return 1;
  }

  SDL_Event event;
  bool exitRequested = false;
  SDL_SetRelativeMouseMode(SDL_TRUE);

  bool chatWheelActive = false;
  const int chatWheelRadius = 60;
  SDL_Rect chatWheelRect{.x = 0, .y = 0, .w = chatWheelRadius * 2, .h = chatWheelRadius * 2};
  SDL_Point chatWheelSavedMousePosition;
  SDL_Point currentMousePosition;

  while (!exitRequested)
  {
    while (SDL_PollEvent(&event))
    {
      switch (event.type)
      {
      case SDL_QUIT:
        exitRequested = true;
        break;
      case SDL_KEYUP:
        if (event.key.keysym.sym == SDLK_ESCAPE)
        {
          exitRequested = true;
        }
        break;
      case SDL_MOUSEMOTION:
        currentMousePosition.x = event.motion.x;
        currentMousePosition.y = event.motion.y;
        break;
      case SDL_MOUSEBUTTONDOWN:
        if (event.button.button == SDL_BUTTON_MIDDLE)
        {
          chatWheelActive = true;
          chatWheelSavedMousePosition = currentMousePosition;
        }
        break;
      case SDL_MOUSEBUTTONUP:
        if (event.button.button == SDL_BUTTON_MIDDLE)
        {
          chatWheelActive = false;
          currentMousePosition = chatWheelSavedMousePosition;
          SDL_WarpMouseInWindow(window, chatWheelSavedMousePosition.x, chatWheelSavedMousePosition.y);
        }
        break;
      default:
        break;
      }
    }

    SDL_Rect mouseCursorRect;
    mouseCursorRect.w = 10;
    mouseCursorRect.h = 10;
    mouseCursorRect.x = currentMousePosition.x;
    mouseCursorRect.y = currentMousePosition.y;

    SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0x00);
    SDL_RenderClear(renderer);

    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
    if (!chatWheelActive)
    {
      SDL_RenderFillRect(renderer, &mouseCursorRect);
    }
    else
    {
      SDL_GetWindowSize(window, &chatWheelRect.x, &chatWheelRect.y);
      chatWheelRect.x = chatWheelRect.x / 2 - chatWheelRadius;
      chatWheelRect.y = chatWheelRect.y / 2 - chatWheelRadius;

      SDL_RenderDrawRect(renderer, &chatWheelRect);
    }

    SDL_RenderPresent(renderer);
  }

  SDL_DestroyWindow(window);
  SDL_Quit();
  return 0;
}