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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 "debugger/debugger.h"
#include "ui/ui.h"
#include <glad/gl.h>
#include <algorithm>
#include <charconv>
#include <chrono>
#include <cstdlib>
#include <fstream>
#include <vector>
namespace Hsdbg
{
namespace
{
using Clock = std::chrono::steady_clock;
constexpr float MAX_DELTA_TIME = 0.25f;
constexpr double MINIMIZED_WAIT_TIMEOUT = 0.1;
// dev aid: HSDBG_CAPTURE=<file.ppm> writes the frame numbered
// HSDBG_CAPTURE_FRAME (default 240) as a binary ppm; returns true on
// that frame so the caller can quit
auto capture_frame(uint64_t frame, uint32_t width, uint32_t height) -> bool
{
static const char* path = std::getenv("HSDBG_CAPTURE");
if (path == nullptr)
return false;
static const uint64_t target = [] {
uint64_t value = 240;
if (const char* text = std::getenv("HSDBG_CAPTURE_FRAME"))
std::from_chars(text, text + std::char_traits<char>::length(text), value);
return value;
}();
if (frame != target)
return false;
const size_t stride = static_cast<size_t>(width) * 3;
std::vector<unsigned char> pixels(stride * height);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, static_cast<GLsizei>(width), static_cast<GLsizei>(height),
GL_RGB, GL_UNSIGNED_BYTE, pixels.data());
std::ofstream out(path, std::ios::binary);
out << "P6\n" << width << ' ' << height << "\n255\n";
for (uint32_t y = height; y-- > 0;)
out.write(reinterpret_cast<const char*>(pixels.data() + y * stride),
static_cast<std::streamsize>(stride));
Log::info("capture: wrote '{}' ({}x{})", path, width, height);
return true;
}
}
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);
m_debugger = std::make_unique<Debugger>();
m_ui = std::make_unique<Ui>(*m_window);
}
Application::~Application()
{
m_ui.reset();
m_debugger.reset();
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
{
m_debugger->update();
// dev aid: HSDBG_STEP_AT=<frame>[,<frame>…] steps over a line on those
// frames while stopped, so a capture can show a target that has moved
static const std::vector<uint64_t> step_frames = [] {
std::vector<uint64_t> frames;
const char* text = std::getenv("HSDBG_STEP_AT");
for (const char* at = text; at != nullptr && *at != '\0';)
{
uint64_t value = 0;
const auto [next, error] = std::from_chars(at, at + std::char_traits<char>::length(at), value);
if (error != std::errc{})
break;
frames.push_back(value);
at = *next == ',' ? next + 1 : next;
}
return frames;
}();
if (std::ranges::find(step_frames, m_frame_count) != step_frames.end() && m_debugger->is_stopped())
(void)m_debugger->step_over();
}
auto Application::render() -> void
{
// clear the whole framebuffer at the very start of the frame, before any
// drawing, so nothing from the previous frame can survive underneath
glViewport(0, 0,
static_cast<GLsizei>(m_window->framebuffer_width()),
static_cast<GLsizei>(m_window->framebuffer_height()));
glDisable(GL_SCISSOR_TEST);
glClearColor(0.05f, 0.05f, 0.06f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
m_ui->begin_frame();
m_ui->draw(*m_debugger);
m_ui->end_frame();
if (capture_frame(m_frame_count, m_window->framebuffer_width(), m_window->framebuffer_height()))
close();
}
}
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