LookingGlass/host/sync-test/main.c

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#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;
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Uint32 fpsStart = SDL_GetTicks();
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float fps = 0.0f;
TTF_Font * fpsFont = NULL;
SDL_Rect fpsTextRect = {5, 5};
SDL_Texture * fpsText = NULL;
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int width = 1000;
int boxX = 100;
int boxY = 100;
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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:
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width = event.window.data1;
boxX = event.window.data1 / 10;
boxY = (event.window.data2 - 40) / 10;
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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: %7.4f, Frame: %05u \"F11\" to toggle Full Screen", fps, frameCount);
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SDL_Surface * fpsSurf = TTF_RenderText_Solid(fpsFont, text, c);
if (fpsText)
SDL_DestroyTexture(fpsText);
fpsText = SDL_CreateTextureFromSurface(renderer, fpsSurf);
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fpsTextRect.x = width / 2 - fpsSurf->w / 2;
fpsTextRect.y = 20 - fpsSurf->h / 2;
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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;
}