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void processInput() {}

void update() {}

void update(double elapsed) {}

void render() {}

void render(double elapsed) {}

double getCurrentTime() { return 0; }

void sleep(double time) {}

int FPS = 60;

int MS_PER_FRAME = 1000 / FPS;

int MS_PER_TICK = 1000 / FPS;

namespace Repl

{

char* readCommand() { return NULL; }

void handleCommand(char* command) {}

void loop()

{

//^1

while (true)

{

char* command = readCommand();

handleCommand(command);

}

//^1

}

}

namespace EventLoop

{

class Event {};

Event* waitForEvent() { return NULL; }

bool dispatchEvent(Event* event) { return false; }

void loop()

{

//^2

while (true)

{

Event* event = waitForEvent();

dispatchEvent(event);

}

//^2

}

}

namespace FastAsPossible

{

void runGame()

{

//^3

while (true)

{

processInput();

update();

render();

}

//^3

}

}

namespace FixedFramerate

{

void runGame()

{

//^4

while (true)

{

double start = getCurrentTime();

processInput();

update();

render();

sleep(start + MS_PER_FRAME - getCurrentTime());

}

//^4

}

}

namespace FluidFramerate

{

void runGame()

{

//^5

double lastTime = getCurrentTime();

while (true)

{

double current = getCurrentTime();

double elapsed = current - lastTime;

processInput();

update(elapsed);

render();

lastTime = current;

}

//^5

}

}

namespace FixedUpdateFramerate

{

void runGame()

{

const double MS_PER_UPDATE = 8;

//^6

double previous = getCurrentTime();

double lag = 0.0;

while (true)

{

double current = getCurrentTime();

double elapsed = current - previous;

previous = current;

lag += elapsed;

processInput();

while (lag >= MS_PER_UPDATE)

{

update();

lag -= MS_PER_UPDATE;

}

render();

}

//^6

}

}

namespace Interpolate

{

void runGame()

{

const double MS_PER_UPDATE = 8;

double lag = 0;

//^7

render(lag / MS_PER_UPDATE);

//^7

}

}