[host] added sync-test application

host/sync-test/main.c

@@ -0,0 +1,105 @@
+#include <stdbool.h>
+#include <SDL.h>
+#include <SDL_ttf.h>
+#include <stdio.h>
+
+int main(int argc, char * argv[])
+{
+  SDL_Window    * window;
+  SDL_Renderer  * renderer;
+
+  TTF_Init();
+  SDL_Init(SDL_INIT_VIDEO);
+  window   = SDL_CreateWindow("sync-test", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1000, 1040, SDL_WINDOW_RESIZABLE);
+  renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+
+  SDL_Event       event;
+  bool            running     = true;
+  unsigned int    frameCount  = 0;
+  Uint32          fpsFrame    = 0;
+  Uint32          fpsStart    = SDL_GetTicks();
+  float           fps         = 0.0f;
+  TTF_Font      * fpsFont     = NULL;
+  SDL_Rect        fpsTextRect = {5, 5};
+  SDL_Texture   * fpsText     = NULL;
+
+  int boxX = 100;
+  int boxY = 100;
+
+  fpsFont = TTF_OpenFont("C:\\Windows\\Fonts\\cour.ttf", 24);
+
+  while (running)
+  {
+    while (SDL_PollEvent(&event))
+      switch(event.type)
+      {
+        case SDL_QUIT:
+          running = false;
+          break;
+
+        case SDL_KEYUP:
+          switch(event.key.keysym.scancode)
+          {
+            case SDL_SCANCODE_ESCAPE:
+              running = false;
+              break;
+
+            case SDL_SCANCODE_F11:
+              SDL_SetWindowFullscreen(window, (SDL_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN_DESKTOP) ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP);
+              break;
+          }
+
+        case SDL_WINDOWEVENT:
+          switch (event.window.event)
+          {
+            case SDL_WINDOWEVENT_RESIZED:
+              boxX = event.window.data1 / 10;
+              boxY = (event.window.data2 - 40) / 10;
+              break;
+          }
+      }
+
+    SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE);
+    SDL_RenderClear(renderer);    
+
+    SDL_SetRenderDrawColor(renderer, 0xff, 0xff, 0xff, SDL_ALPHA_OPAQUE);
+    for (int y = 0; y < 10; ++y)
+      for (int x = 0; x < 10; ++x)
+      {
+        const SDL_Rect rect = { x * boxX, y * boxY + 40, boxX, boxY};
+        if (y * 10 + x == frameCount % 100)
+          SDL_RenderFillRect(renderer, &rect);
+         else
+          SDL_RenderDrawRect(renderer, &rect);
+      }
+
+    if (SDL_GetTicks() - fpsStart > 1000)
+    {
+      const float delta         = (float)(SDL_GetTicks() - fpsStart) / 1000.0f;
+      const unsigned int frames = frameCount - fpsFrame;
+      fps = (float)frames / delta;
+
+      fpsStart = SDL_GetTicks();
+      fpsFrame = frameCount;
+    }
+
+    const SDL_Color c = {0x00, 0xff, 0x00, 0xff};
+    char text[128];
+    snprintf(text, sizeof(text), "FPS: %5.2f, Frame: %05u    \"F11\" to toggle Full Screen", fps, frameCount);
+    SDL_Surface * fpsSurf = TTF_RenderText_Solid(fpsFont, text, c);
+    if (fpsText)
+      SDL_DestroyTexture(fpsText);
+    fpsText = SDL_CreateTextureFromSurface(renderer, fpsSurf);
+    fpsTextRect.w = fpsSurf->w;
+    fpsTextRect.h = fpsSurf->h;
+    SDL_FreeSurface(fpsSurf);
+    SDL_RenderCopy(renderer, fpsText, NULL, &fpsTextRect);
+
+    SDL_RenderPresent(renderer);
+    ++frameCount;
+  }
+
+  SDL_DestroyRenderer(renderer);
+  SDL_DestroyWindow(window);
+  return 0;
+}