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#include "core/application.h"
#include "core/assert.h"
#include "core/log.h"
#include <chrono>
namespace Hsdbg
{
namespace
{
using Clock = std::chrono::steady_clock;
constexpr float MAX_DELTA_TIME = 0.25f;
// the run loop has nothing to block on until the window owns it, so it is
// time boxed for now to keep the app from spinning forever
constexpr float PLACEHOLDER_RUN_TIME = 1.0f;
}
Application* Application::s_instance = nullptr;
Application::Application(const ApplicationSpec& spec)
: m_spec(spec)
{
HSDBG_ASSERT(s_instance == nullptr, "an Application instance already exists");
s_instance = this;
Log::info("{}: starting up", m_spec.name);
}
Application::~Application()
{
Log::info("{}: shutting down after {} frames", m_spec.name, m_frame_count);
s_instance = nullptr;
}
auto Application::get() -> Application&
{
HSDBG_ASSERT(s_instance != nullptr, "no Application instance has been created");
return *s_instance;
}
auto Application::run() -> void
{
m_running = true;
auto last_frame_time = Clock::now();
while (m_running)
{
const auto now = Clock::now();
const float elapsed = std::chrono::duration<float>(now - last_frame_time).count();
last_frame_time = now;
m_delta_time = elapsed < MAX_DELTA_TIME ? elapsed : MAX_DELTA_TIME;
m_time += m_delta_time;
m_frame_count += 1;
update();
}
}
auto Application::close() -> void
{
m_running = false;
}
auto Application::update() -> void
{
if (m_time >= PLACEHOLDER_RUN_TIME)
close();
}
}
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