commit 765b823365b75b3281ae1c806734127aa0557716
Author: lifning <>
Date:   Sat Oct 16 02:29:48 2021 -0700

    initial commit: draw a font (ui eventually) layer above the gameplay

diff --git a/.gitignore b/.gitignore
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "xml-rs"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
+
+[[package]]
+name = "zretro"
+version = "0.1.0"
+dependencies = [
+ "ferretro_components",
+ "sdl2",
+ "structopt",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4625695
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "zretro"
+version = "0.1.0"
+authors = ["lifning"]
+edition = "2018"
+
+[patch.'https://git.vvn.space/cinnabon/rustro']
+ferretro_base = { path = "../ferretro/ferretro_base" }
+ferretro_components = { path = "../ferretro/ferretro_components" }
+
+[dependencies.ferretro_components]
+git = "https://git.vvn.space/cinnabon/rustro"
+branch = "matriarch"
+features = ["sdl2_comp"]
+
+[dependencies]
+sdl2 = { version = "0.32", features = ["image"] }
+structopt = "0.3"
diff --git a/src/lifont.png b/src/lifont.png
new file mode 100644
index 0000000..02e4460
Binary files /dev/null and b/src/lifont.png differ
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d131151
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,131 @@
+extern crate ferretro_components;
+extern crate sdl2;
+
+use std::cell::RefCell;
+use std::ffi::CStr;
+use std::path::PathBuf;
+use std::pin::Pin;
+use std::rc::Rc;
+
+use sdl2::render::{WindowCanvas, Texture, TextureCreator};
+use sdl2::image::ImageRWops;
+use sdl2::surface::Surface;
+use sdl2::video::WindowContext;
+
+use structopt::StructOpt;
+
+use ferretro_components::base::{ControlFlow, RetroComponentBase};
+use ferretro_components::prelude::LibretroWrapperAccess;
+use ferretro_components::provided::{
+    sdl2::{Sdl2SurfaceComponent, SimpleSdl2AudioComponent},
+    stdlib::{SleepFramerateLimitComponent, PathBufComponent},
+};
+
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+#[derive(StructOpt)]
+struct Opt {
+    /// Core module to use.
+    #[structopt(short, long, parse(from_os_str))]
+    core: PathBuf,
+    /// ROM to load using the core.
+    #[structopt(short, long, parse(from_os_str))]
+    rom: PathBuf,
+    /// System directory, often containing BIOS files
+    #[structopt(short, long, parse(from_os_str))]
+    system: Option<PathBuf>,
+}
+
+struct Zretro {
+    emu: Pin<Box<RetroComponentBase>>,
+    canvas: WindowCanvas,
+    font: Surface<'static>,
+    sdl2surf_comp: Rc<RefCell<Sdl2SurfaceComponent>>,
+}
+
+const FONT_PNG: &'static [u8] = include_bytes!("lifont.png");
+
+impl Zretro {
+    fn new(opt: Opt) -> Result<Self> {
+        let mut emu = RetroComponentBase::new(&opt.core);
+
+        let geometry = emu.libretro_core().get_system_av_info().geometry;
+        let sys_info = emu.libretro_core().get_system_info();
+        let title = format!(
+            "zretro - {}",
+            unsafe { CStr::from_ptr(sys_info.library_name) }.to_string_lossy()
+        );
+
+        let mut sdl_context = sdl2::init()?;
+
+        let window = sdl_context
+            .video()?
+            .window(title.as_str(), geometry.base_width, geometry.base_height)
+            .borderless()
+            .build()?;
+        let mut canvas = window.into_canvas().build()?;
+
+        let sdl2surf_comp = Rc::new(RefCell::new(
+            Sdl2SurfaceComponent::new(emu.libretro_core())?
+        ));
+        emu.register_component(sdl2surf_comp.clone());
+
+        let sdl2_audio = SimpleSdl2AudioComponent::new(&mut sdl_context, emu.libretro_core());
+        emu.register_component(sdl2_audio);
+
+        let sleep_fps = SleepFramerateLimitComponent::new(emu.libretro_core());
+        emu.register_component(sleep_fps);
+
+        emu.register_component(PathBufComponent {
+            sys_path: opt.system.clone(),
+            libretro_path: Some(opt.core.to_path_buf()),
+            core_assets_path: None,
+            save_path: Some(std::env::temp_dir()),
+        });
+
+        emu.init().unwrap();
+        emu.load_game(&opt.rom).unwrap();
+
+        let rwops = sdl2::rwops::RWops::from_bytes(FONT_PNG)?;
+        let font_shortlived = rwops.load_png()?;
+        // there's a nonsemantic inheritance of lifetime from ImageRWops::load_png. TODO: pr
+        let font = unsafe {
+            let ptr = font_shortlived.raw();
+            std::mem::forget(font_shortlived);
+            Surface::from_ll(ptr)
+        };
+
+        Ok(Zretro {
+            emu,
+            canvas,
+            font,
+            sdl2surf_comp,
+        })
+    }
+
+    fn run(&mut self) -> Result<()> {
+        let tc = self.canvas.texture_creator();
+        let font_tx = tc.create_texture_from_surface(&self.font)?;
+        let mut font_rect = self.font.rect();
+        font_rect.set_height(64);
+        while let ControlFlow::Continue = self.emu.run() {
+            let ref_mut = RefCell::try_borrow_mut(&self.sdl2surf_comp)?;
+            let mut surface = ref_mut.surface();
+
+            let texture = tc.create_texture_from_surface(surface)?;
+
+            self.canvas.clear();
+            self.canvas.copy(&texture, None, None)?;
+            self.canvas.copy(&font_tx, font_rect, font_rect)?;
+            self.canvas.present();
+        }
+        Ok(())
+    }
+}
+
+fn main() -> Result<()> {
+    let opt: Opt = Opt::from_args();
+    let mut frontend = Zretro::new(opt)?;
+    frontend.run()?;
+    Ok(())
+}