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App.cpp
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App.cpp
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// Copyright 2019-2024 Jan Niklas Hasse <[email protected]>
// For conditions of distribution and use, see copyright notice in LICENSE.txt
#include "App.hpp"
#include "jngl/AppParameters.hpp"
#include "jngl/ShaderProgram.hpp"
#include "jngl/screen.hpp"
#include "jngl/window.hpp"
#include "jngl/work.hpp"
#include "log.hpp"
#include "windowptr.hpp"
#include <cmath>
#include <memory>
#include <set>
#include <stdexcept>
namespace jngl {
/// Restarts the program via Steam if needed
void initSteamAchievements();
/// Initializes the Steamworks SDK (if JNGL_STEAMWORKS has been set via CMake)
void initSteam(uint32_t steamAppId);
App* App::self = nullptr;
struct App::Impl {
std::string displayName;
bool pixelArt = false;
std::optional<uint32_t> steamAppId;
std::set<ShaderProgram*> shaderPrograms;
};
App::App() {
if (self) {
throw std::runtime_error("You may only create one instance of jngl::App.");
}
self = this;
}
App::~App() {
self = nullptr;
}
App& App::instance() {
if (!self) {
self = new App;
}
return *self;
}
Finally App::init(AppParameters params) {
assert(impl == nullptr);
impl = std::make_unique<App::Impl>(
App::Impl{ std::move(params.displayName), params.pixelArt, params.steamAppId, {} });
return Finally{ [this]() { impl.reset(); } };
}
void App::atExit(std::function<void()> f) {
callAtExit.emplace_back(std::move(f));
}
void App::callAtExitFunctions() {
auto tmp = std::move(callAtExit);
assert(callAtExit.empty());
for (const auto& f : tmp) {
f();
}
if (!callAtExit.empty()) {
internal::warn("The destructor of a Singleton caused the creation of another Singleton. "
"Use handleIfAlive inside of destructors of Singletons.");
}
callAtExit.clear();
}
std::string App::getDisplayName() const {
return impl ? impl->displayName : "";
}
void App::setDisplayName(const std::string& displayName) {
if (!impl) { // e.g. Android when using showWindow without jnglInit
new Finally(init({})); // leak
}
impl->displayName = displayName;
}
void App::mainLoop() {
if (impl->steamAppId) {
initSteamAchievements();
}
internal::debug("Starting main loop for '{}'.", impl->displayName);
pWindow->mainLoop();
}
bool App::isPixelArt() {
return self ? self->impl->pixelArt : false;
}
void App::setPixelArt(const bool pixelArt) {
impl->pixelArt = pixelArt;
}
void App::registerShaderProgram(ShaderProgram* shaderProgram) {
if (!impl) { // unit tests
new Finally(init({})); // leak
}
impl->shaderPrograms.insert(shaderProgram);
}
void App::unregisterShaderProgram(ShaderProgram* shaderProgram) {
impl->shaderPrograms.erase(shaderProgram);
}
void App::updateProjectionMatrix() const {
for (const auto shaderProgram : impl->shaderPrograms) {
const auto context = shaderProgram->use();
glUniformMatrix4fv(shaderProgram->getUniformLocation("projection"), 1, GL_FALSE,
opengl::projection.data);
}
}
#if !defined(__APPLE__) || !defined(TARGET_OS_IPHONE) || !TARGET_OS_IPHONE // iOS
namespace internal {
void mainLoop(AppParameters params) {
auto context = App::instance().init(params);
if (auto id = params.steamAppId) {
jngl::initSteam(*id);
}
bool fullscreen = false;
#if (!defined(__EMSCRIPTEN__) && defined(NDEBUG)) || defined(__ANDROID__)
fullscreen = true;
#endif
if (params.fullscreen) {
fullscreen = *params.fullscreen;
}
std::pair<int, int> minAspectRatio{ 1, 3 };
std::pair<int, int> maxAspectRatio{ 3, 1 };
if (params.screenSize) {
maxAspectRatio = minAspectRatio = std::pair<int, int>(std::lround(params.screenSize->x),
std::lround(params.screenSize->y));
} else {
params.screenSize = { static_cast<double>(getDesktopWidth()),
static_cast<double>(getDesktopHeight()) };
fullscreen = true;
}
if (!fullscreen) {
// Make window as big as possible
const double scaleFactor = std::min((getDesktopWidth() * 0.925) / params.screenSize->x,
(getDesktopHeight() * 0.925) / params.screenSize->y);
if (scaleFactor > 1) {
setScaleFactor(std::floor(scaleFactor));
} else {
setScaleFactor(scaleFactor);
}
}
showWindow(params.displayName,
fullscreen ? getDesktopWidth()
: static_cast<int>(std::lround(params.screenSize->x * getScaleFactor())),
fullscreen ? getDesktopHeight()
: static_cast<int>(std::lround(params.screenSize->y * getScaleFactor())),
fullscreen, params.minAspectRatio ? *params.minAspectRatio : minAspectRatio,
params.maxAspectRatio ? *params.maxAspectRatio : maxAspectRatio);
if (fullscreen && params.screenSize->x > 0 && params.screenSize->y > 0) {
const auto windowSize = jngl::getWindowSize();
setScaleFactor(std::min(static_cast<double>(windowSize[0]) / params.screenSize->x,
static_cast<double>(windowSize[1]) / params.screenSize->y));
}
setWork(params.start());
App::instance().mainLoop();
hideWindow();
}
} // namespace internal
#endif
} // namespace jngl