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#include "core/application.h"
#include "core/assert.h"
#include "core/log.h"
#include "core/window.h"
#include "core/window_manager.h"
#include <glad/gl.h>
#include <chrono>
namespace Hsdbg
{
namespace
{
using Clock = std::chrono::steady_clock;
constexpr float MAX_DELTA_TIME = 0.25f;
// a minimized window has no framebuffer to draw into, so idle instead of
// burning a core on frames nobody can see
constexpr double MINIMIZED_WAIT_TIMEOUT = 0.1;
}
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);
m_window_manager = std::make_unique<WindowManager>();
WindowSpec window_spec;
window_spec.title = m_spec.name;
window_spec.width = m_spec.width;
window_spec.height = m_spec.height;
window_spec.vsync = m_spec.vsync;
m_window = &m_window_manager->create_window(window_spec);
}
Application::~Application()
{
m_window = nullptr;
m_window_manager.reset();
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;
m_window_manager->poll_events();
if (m_window->should_close())
{
close();
break;
}
if (m_window->is_minimized())
{
m_window_manager->wait_events(MINIMIZED_WAIT_TIMEOUT);
continue;
}
update();
render();
m_window->swap_buffers();
}
}
auto Application::close() -> void
{
m_running = false;
}
auto Application::update() -> void
{
}
auto Application::render() -> void
{
glViewport(0,
0,
static_cast<GLsizei>(m_window->framebuffer_width()),
static_cast<GLsizei>(m_window->framebuffer_height()));
glClearColor(0.09f, 0.09f, 0.11f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
}
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