2021-10-16 11:29:48 +02:00
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extern crate ferretro_components;
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extern crate sdl2;
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use std::ffi::CStr;
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use std::path::PathBuf;
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use std::pin::Pin;
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2021-10-17 23:19:22 +02:00
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use sdl2::render::{WindowCanvas, BlendMode};
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use sdl2::image::ImageRWops;
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use sdl2::surface::Surface;
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use sdl2::pixels::{Color, PixelFormatEnum};
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use sdl2::rect::Rect;
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use rand::{SeedableRng, Rng};
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use rand_xoshiro::Xoshiro128Plus;
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use structopt::StructOpt;
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2021-10-18 06:47:24 +02:00
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use ferretro_components::base::ControlFlow;
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use ferretro_components::prelude::*;
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use ferretro_components::provided::{
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sdl2::{Sdl2SurfaceComponent, SimpleSdl2AudioComponent},
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stdlib::{SleepFramerateLimitComponent, PathBufComponent},
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};
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type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
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#[derive(StructOpt)]
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struct Opt {
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/// Core module to use.
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#[structopt(short, long, parse(from_os_str))]
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core: PathBuf,
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/// ROM to load using the core.
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#[structopt(short, long, parse(from_os_str))]
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rom: PathBuf,
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/// System directory, often containing BIOS files
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#[structopt(short, long, parse(from_os_str))]
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system: Option<PathBuf>,
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}
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struct Zretro {
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emu: Pin<Box<RetroComponentBase>>,
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canvas: WindowCanvas,
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font: Surface<'static>,
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rng: Xoshiro128Plus,
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ui_bg: Option<Surface<'static>>,
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snowflakes: Vec<Rect>,
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sdl2surf_comp_id: RetroComponentId,
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}
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const FONT_PNG: &'static [u8] = include_bytes!("lifont.png");
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impl Zretro {
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fn new(opt: Opt) -> Result<Self> {
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let mut emu = RetroComponentBase::new(&opt.core);
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let geometry = emu.libretro_core().get_system_av_info().geometry;
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let sys_info = emu.libretro_core().get_system_info();
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let title = format!(
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"zretro - {}",
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unsafe { CStr::from_ptr(sys_info.library_name) }.to_string_lossy()
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);
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let mut sdl_context = sdl2::init()?;
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let window = sdl_context
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.video()?
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.window(title.as_str(), geometry.base_width, geometry.base_height)
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.borderless()
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.build()?;
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let canvas = window.into_canvas().build()?;
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let sdl2surf_comp = Sdl2SurfaceComponent::new(emu.libretro_core())?;
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let sdl2surf_comp_id = emu.register_component(sdl2surf_comp)?;
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let sdl2_audio = SimpleSdl2AudioComponent::new(&mut sdl_context, emu.libretro_core());
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emu.register_component(sdl2_audio)?;
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let sleep_fps = SleepFramerateLimitComponent::new(emu.libretro_core());
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emu.register_component(sleep_fps)?;
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emu.register_component(PathBufComponent {
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sys_path: opt.system.clone(),
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libretro_path: Some(opt.core.to_path_buf()),
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core_assets_path: None,
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save_path: Some(std::env::temp_dir()),
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})?;
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emu.init().unwrap();
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emu.load_game(&opt.rom).unwrap();
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let rwops = sdl2::rwops::RWops::from_bytes(FONT_PNG)?;
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let font_shortlived = rwops.load_png()?;
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// there's a nonsemantic inheritance of lifetime from ImageRWops::load_png. TODO: pr
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let font = unsafe {
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let ptr = font_shortlived.raw();
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std::mem::forget(font_shortlived);
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Surface::from_ll(ptr)
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};
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let mut rng = rand_xoshiro::Xoshiro128Plus::from_entropy();
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let mut ui_bg = Surface::new(geometry.base_width, geometry.base_height, PixelFormatEnum::ABGR8888)?;
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ui_bg.fill_rect(None, Color::RGBA(0, 0, 128, 128))?;
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let snowflakes = (0..100).into_iter()
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.map(|_| Rect::new(
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rng.gen_range(0..ui_bg.width() as i32),
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rng.gen_range(0..ui_bg.height() as i32),
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2, 2))
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.collect();
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Ok(Zretro {
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emu,
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canvas,
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font,
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rng,
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ui_bg: Some(ui_bg),
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snowflakes,
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sdl2surf_comp_id,
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})
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}
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fn update_snow(&mut self) -> Result<()> {
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let mut ui_bg = self.ui_bg.take().ok_or("no ui_bg?")?;
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ui_bg.fill_rect(None, Color::RGBA(0, 0, 128, 128))?;
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let w = ui_bg.width() as i32;
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let h = ui_bg.height() as i32;
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for flake in &mut self.snowflakes {
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let x = flake.x() + self.rng.gen_range(-1..=1);
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let y = flake.y() + 1;
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flake.set_x(x % w);
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flake.set_y(y % h);
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}
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let mut ui_canvas = ui_bg.into_canvas()?;
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ui_canvas.set_draw_color(Color::RGBA(255, 255, 255, 160));
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ui_canvas.draw_rects(&self.snowflakes[..])?;
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self.ui_bg = Some(ui_canvas.into_surface());
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Ok(())
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}
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fn run(&mut self) -> Result<()> {
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let tc = self.canvas.texture_creator();
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let font_tx = tc.create_texture_from_surface(&self.font)?;
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let mut font_rect = self.font.rect();
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font_rect.set_height(64);
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while let ControlFlow::Continue = self.emu.run() {
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self.update_snow()?;
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let ref_mut = self.emu.component_mut::<Sdl2SurfaceComponent>(self.sdl2surf_comp_id)?;
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let surface = ref_mut.surface();
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let emu_tx = tc.create_texture_from_surface(surface)?;
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let ui_bg_surf_ref = self.ui_bg.as_ref().ok_or("no bg?")?;
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let mut ui_tx = tc.create_texture_from_surface(ui_bg_surf_ref)?;
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ui_tx.set_blend_mode(BlendMode::Blend);
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self.canvas.clear();
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self.canvas.copy(&emu_tx, None, None)?;
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self.canvas.copy(&ui_tx, None, None)?;
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self.canvas.copy(&font_tx, font_rect, font_rect)?;
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self.canvas.present();
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}
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Ok(())
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}
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}
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fn main() -> Result<()> {
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let opt: Opt = Opt::from_args();
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let mut frontend = Zretro::new(opt)?;
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frontend.run()?;
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Ok(())
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}
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