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#include "nes/app/application.hh"
#include "nes/app/input/input-device-keyboard.hh"
#include "nes/app/input/input-device-controller.hh"
#include "nes/app/ui/screen.hh"
#include "nes/app/graphics/renderer.hh"
#include "nes/app/action.hh"
#include "nes/app/crypto/aes256.hh"
#include "nes/app/crypto/sha256.hh"
namespace nes::app
{
auto application::display_proxy::get_front() const -> span<rgb, display::width * display::height>
{
return buffer_front_;
}
auto application::display_proxy::set(u32 const x, u32 const y, rgb const value) -> void
{
buffer_back_[y * display::width + x] = value;
base.set(x, y, value);
}
auto application::display_proxy::switch_buffers() -> void
{
auto r = renderer{ base };
if (visible_screen)
{
visible_screen->render(r);
}
if (visible_popup)
{
visible_popup->render(r);
}
if (preferences_.get_fps_counter())
{
r.render_rect(30, 29, 2, 1, color::fixed_black);
auto const attrs = text_attributes{}
.set_max_width(2)
.set_alignment(text_alignment::right);
r.render_text_format(32, 29, color::fixed_white, attrs, "{}", fps.get_fps());
}
swap(buffer_front_, buffer_back_);
base.switch_buffers();
}
application::application(display& display, input_device_keyboard& keyboard, file_browser& file_browser)
: input_manager_{ keyboard }
, file_browser_{ file_browser }
, display_{ preferences_, display }
, screen_title_{ keyboard }
, screen_browser_{ keyboard, file_browser }
, screen_settings_{ input_manager_, preferences_ }
, screen_help_{ input_manager_ }
, screen_error_{ keyboard }
, screen_confirm_quit_{ keyboard }
, screen_prompt_key_{ keyboard }
, screen_file_viewer_{ keyboard, file_browser }
{
display_.visible_screen = &screen_title_;
}
auto application::frame(u32 const elapsed_time_us) -> void
{
display_.fps.frame(elapsed_time_us);
if (display_.visible_popup)
{
auto const a = display_.visible_popup->process_events();
handle_action(a);
}
else if (display_.visible_screen)
{
auto const a = display_.visible_screen->process_events();
handle_action(a);
}
if (display_.visible_screen)
{
// Directly let the scene render itself without rendering any gameplay (the scene is responsible for
// clearing the buffer).
display_.switch_buffers();
}
else if (console_)
{
// Handle escape key.
while (auto const event = input_manager_.get_keyboard().poll_event())
{
if (event == input_event::key_down(key::escape))
{
screen_freeze_.freeze(display_.get_front());
screen_confirm_quit_.set_confirm(false);
display_.visible_screen = &screen_freeze_;
display_.visible_popup = &screen_confirm_quit_;
display_.switch_buffers();
return;
}
}
// Forward current input state to the NES.
console_->ref_controller_1().set_pressed(input_manager_.get_input_1().read_buttons());
console_->ref_controller_2().set_pressed(input_manager_.get_input_2().read_buttons());
// The scene is rendered by the console after the PPU requests a new frame (thus calling
// display_proxy::switch_buffers).
console_->step(sys::cycle_count::from_microseconds(elapsed_time_us));
if (console_->get_status() != status::success)
{
screen_freeze_.freeze(display_.get_front());
display_.visible_screen = &screen_freeze_;
show_error("Runtime error", console_->get_status(), action::go_to_browser());
console_.clear();
}
}
}
auto application::handle_action(action const& a) -> void
{
switch (a.get_type())
{
case action::type::none:
{
break;
}
case action::type::go_to_title:
{
go_to_screen(&screen_title_);
break;
}
case action::type::go_to_browser:
case action::type::confirm_quit:
{
go_to_screen(&screen_browser_);
break;
}
case action::type::go_to_settings:
{
go_to_screen(&screen_settings_);
break;
}
case action::type::go_to_help:
{
go_to_screen(&screen_help_);
break;
}
case action::type::close_popup:
{
display_.visible_popup = nullptr;
break;
}
case action::type::cancel_quit:
{
display_.visible_popup = nullptr;
display_.visible_screen = nullptr;
break;
}
case action::type::prompt_key:
{
screen_prompt_key_.reset(a.get_file_name());
display_.visible_popup = &screen_prompt_key_;
break;
}
case action::type::launch_game:
{
u8 buffer[sys::cartridge::max_file_size];
auto length = u32{ 0 };
if (auto const s = file_browser_.load(a.get_file_name(), buffer, &length); s != status::success)
{
show_error("Unable to open file", s);
break;
}
if (!a.get_key().is_empty())
{
auto const key = span{ reinterpret_cast<u8 const*>(a.get_key().get_data()), a.get_key().get_length() };
auto const key_hash = sha256::hash(key);
aes256::decrypt(span{ buffer, length }, key_hash.get_data());
}
console_.emplace(display_, span<u8 const>{ buffer, length });
if (console_->get_status() != status::success)
{
show_error("Unable to load cartridge", console_->get_status());
console_.clear();
break;
}
display_.visible_screen = nullptr;
display_.visible_popup = nullptr;
break;
}
case action::type::view_file:
{
if (auto const s = screen_file_viewer_.load(a.get_file_name()); s != status::success)
{
show_error("Unable to open file", s);
}
else
{
display_.visible_popup = &screen_file_viewer_;
}
break;
}
case action::type::show_error:
{
show_error(a.get_message(), a.get_error());
break;
}
}
}
auto application::show_error(string_view const message, status const error, action const& action) -> void
{
screen_error_.set_message(message);
screen_error_.set_error(error);
screen_error_.set_action(action);
display_.visible_popup = &screen_error_;
}
auto application::go_to_screen(screen* screen) -> void
{
console_.clear();
display_.visible_screen = screen;
display_.visible_popup = nullptr;
}
} // namespace nes::app
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