blob: d1c4749e84b369d50ef39b5705a6870c9ee37c33 [file] [log] [blame]
#![cfg(target_os = "android")]
//! Android example
//!
//! Run using `cargo apk run --example android`
//!
//! Requires the [cargo-apk] tool.
//! [cargo-apk]: https://crates.io/crates/cargo-apk
use raw_window_handle::android::AndroidHandle;
use raw_window_handle::{HasRawWindowHandle, RawWindowHandle};
use ndk::native_window::NativeWindow;
use ndk_glue::Event;
use piet_gpu_hal::{
CmdBuf, Error, ImageLayout, Instance, QueryPool, Semaphore, Session, SubmittedCmdBuf, Surface,
Swapchain,
};
use piet::kurbo::Point;
use piet::{RenderContext, Text, TextAttribute, TextLayoutBuilder};
use piet_gpu::{test_scenes, PietGpuRenderContext, RenderDriver, Renderer};
#[cfg_attr(target_os = "android", ndk_glue::main(backtrace = "on"))]
fn main() {
my_main().unwrap();
}
struct MyHandle {
handle: AndroidHandle,
}
// State required to render and present the contents
struct GfxState {
session: Session,
render_driver: RenderDriver,
swapchain: Swapchain,
current_frame: usize,
present_semaphores: Vec<Semaphore>,
}
const NUM_FRAMES: usize = 2;
fn my_main() -> Result<(), Error> {
let mut gfx_state = None;
loop {
for event in ndk_glue::poll_events() {
println!("got event {:?}", event);
match event {
Event::WindowCreated => {
let window = ndk_glue::native_window();
if let Some(window) = &*window {
let width = window.width() as usize;
let height = window.height() as usize;
let handle = get_handle(window);
let (instance, surface) = Instance::new(Some(&handle), Default::default())?;
gfx_state =
Some(GfxState::new(&instance, surface.as_ref(), width, height)?);
} else {
println!("native window is sadly none");
}
}
Event::WindowRedrawNeeded => {
if let Some(gfx_state) = gfx_state.as_mut() {
for _ in 0..1000 {
gfx_state.redraw();
}
}
}
_ => (),
}
}
}
}
fn get_handle(window: &NativeWindow) -> MyHandle {
println!(
"window = {:?}, {}x{}",
window.ptr(),
window.width(),
window.height()
);
let mut handle = AndroidHandle::empty();
handle.a_native_window = window.ptr().as_ptr() as *mut std::ffi::c_void;
MyHandle { handle }
}
unsafe impl HasRawWindowHandle for MyHandle {
fn raw_window_handle(&self) -> RawWindowHandle {
RawWindowHandle::Android(self.handle)
}
}
impl GfxState {
fn new(
instance: &Instance,
surface: Option<&Surface>,
width: usize,
height: usize,
) -> Result<GfxState, Error> {
unsafe {
let device = instance.device(surface)?;
let swapchain = instance.swapchain(width, height, &device, surface.unwrap())?;
let session = Session::new(device);
let current_frame = 0;
let present_semaphores = (0..NUM_FRAMES)
.map(|_| session.create_semaphore())
.collect::<Result<Vec<_>, Error>>()?;
let renderer = Renderer::new(&session, width, height, NUM_FRAMES)?;
let render_driver = RenderDriver::new(&session, NUM_FRAMES, renderer);
Ok(GfxState {
session,
render_driver,
swapchain,
current_frame,
present_semaphores,
})
}
}
fn redraw(&mut self) {
println!("redraw");
unsafe {
let frame_idx = self.current_frame % NUM_FRAMES;
let mut info_string = String::new();
if self.current_frame >= NUM_FRAMES {
let stats = self
.render_driver
.get_timing_stats(&self.session, frame_idx);
info_string = stats.short_summary();
println!("{}", info_string);
}
let mut ctx = PietGpuRenderContext::new();
test_scenes::render_anim_frame(&mut ctx, self.current_frame);
//test_scenes::render_tiger(&mut ctx);
render_info_string(&mut ctx, &info_string);
if let Err(e) = self
.render_driver
.upload_render_ctx(&self.session, &mut ctx)
{
println!("error in uploading: {}", e);
}
let (image_idx, acquisition_semaphore) = self.swapchain.next().unwrap();
let swap_image = self.swapchain.image(image_idx);
self.render_driver.run_coarse(&self.session).unwrap();
let target = self.render_driver.record_fine(&self.session).unwrap();
let cmd_buf = target.cmd_buf;
// Image -> Swapchain
cmd_buf.image_barrier(&swap_image, ImageLayout::Undefined, ImageLayout::BlitDst);
cmd_buf.blit_image(target.image, &swap_image);
cmd_buf.image_barrier(&swap_image, ImageLayout::BlitDst, ImageLayout::Present);
self.render_driver
.submit(
&self.session,
&[&acquisition_semaphore],
&[&self.present_semaphores[frame_idx]],
)
.unwrap();
self.swapchain
.present(image_idx, &[&self.present_semaphores[frame_idx]])
.unwrap();
self.render_driver.next_buffer();
self.current_frame += 1;
}
}
}
fn render_info_string(rc: &mut impl RenderContext, info: &str) {
let layout = rc
.text()
.new_text_layout(info.to_string())
.default_attribute(TextAttribute::FontSize(60.0))
.build()
.unwrap();
rc.draw_text(&layout, Point::new(110.0, 120.0));
}