add sdl implementation

1 files changed, 89 insertions, 0 deletions

diff --git a/app/sdl/state.cc b/app/sdl/state.cc
new file mode 100644
index 0000000..fd3bcc5
--- /dev/null
+++ b/app/sdl/state.cc
@@ -0,0 +1,89 @@
+#include "state.hh"
+#include <SDL3/SDL_events.h>
+#include <SDL3/SDL_video.h>
+#include <iostream>
+
+namespace nes::app::sdl
+{
+	state::state()
+		: application_{ display_, keyboard_, file_browser_ }
+	{
+		SDL_SetAppMetadata("NES", "1.0", "com.github.hannesschulze.nes");
+
+		if (!SDL_Init(SDL_INIT_VIDEO))
+		{
+			std::cerr << "Couldn't initialize SDL: " << SDL_GetError() << std::endl;
+			status_ = status::error_system_error;
+			return;
+		}
+
+		if (!SDL_CreateWindowAndRenderer("NES", display::width * 3, display::height * 3, 0, &window_, &renderer_))
+		{
+			std::cerr << "Couldn't create window/renderer: " << SDL_GetError() << std::endl;
+			status_ = status::error_system_error;
+			return;
+		}
+
+		SDL_SetRenderVSync(renderer_, SDL_RENDERER_VSYNC_ADAPTIVE);
+
+		if (!(texture_ = SDL_CreateTexture(renderer_, SDL_PIXELFORMAT_RGBX8888, SDL_TEXTUREACCESS_STREAMING, display::width, display::height)))
+		{
+			std::cerr << "Couldn't create texture: " << SDL_GetError() << std::endl;
+			status_ = status::error_system_error;
+			return;
+		}
+
+		if (!SDL_SetTextureScaleMode(texture_, SDL_SCALEMODE_NEAREST))
+		{
+			std::cerr << "Unable to set texture scale mode: " << SDL_GetError() << std::endl;
+			status_ = status::error_system_error;
+			return;
+		}
+
+		display_.set_texture(texture_);
+	}
+
+	state::~state()
+	{
+		if (texture_) { SDL_DestroyTexture(texture_); }
+	}
+
+	auto state::handle_event(SDL_Event* event) -> void
+	{
+		switch (event->type)
+		{
+			case SDL_EVENT_KEY_DOWN:
+				keyboard_.handle_key_down(event);
+				break;
+			case SDL_EVENT_KEY_UP:
+				keyboard_.handle_key_up(event);
+				break;
+			default:
+				break;
+		}
+	}
+
+	auto state::handle_iterate() -> void
+	{
+		auto const current = std::chrono::steady_clock::now();
+		auto const previous = last_time_point_.value_or(current);
+		last_time_point_ = current;
+
+		auto const elapsed_us = std::chrono::duration_cast<std::chrono::microseconds>(current - previous);
+		application_.frame(static_cast<u32>(elapsed_us.count()));
+
+		if (!SDL_RenderTexture(renderer_, texture_, nullptr, nullptr))
+		{
+			std::cerr << "Unable to render texture: " << SDL_GetError() << std::endl;
+			status_ = status::error_system_error;
+			return;
+		}
+
+		if (!SDL_RenderPresent(renderer_))
+		{
+			std::cerr << "Unable to present frame: " << SDL_GetError() << std::endl;
+			status_ = status::error_system_error;
+			return;
+		}
+	}
+} // namespace nes::app::sdl