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mod utils;
use crate::utils::*;
use drm::control::Device as ControlDevice;
use drm::buffer::DrmFourcc;
use drm::control::{connector, crtc};
pub fn main() {
let card = Card::open_global();
// Load the information.
let res = card
.resource_handles()
.expect("Could not load normal resource ids.");
let coninfo: Vec<connector::Info> = res
.connectors()
.iter()
.flat_map(|con| card.get_connector(*con, true))
.collect();
let crtcinfo: Vec<crtc::Info> = res
.crtcs()
.iter()
.flat_map(|crtc| card.get_crtc(*crtc))
.collect();
// Filter each connector until we find one that's connected.
let con = coninfo
.iter()
.find(|&i| i.state() == connector::State::Connected)
.expect("No connected connectors");
// Get the first (usually best) mode
let &mode = con.modes().first().expect("No modes found on connector");
let (disp_width, disp_height) = mode.size();
// Find a crtc and FB
let crtc = crtcinfo.first().expect("No crtcs found");
// Select the pixel format
let fmt = DrmFourcc::Xrgb8888;
// Create a DB
// If buffer resolution is larger than display resolution, an ENOSPC (not enough video memory)
// error may occur
let mut db = card
.create_dumb_buffer((disp_width.into(), disp_height.into()), fmt, 32)
.expect("Could not create dumb buffer");
// Map it and grey it out.
{
let mut map = card
.map_dumb_buffer(&mut db)
.expect("Could not map dumbbuffer");
for b in map.as_mut() {
*b = 128;
}
}
// Create an FB:
let fb = card
.add_framebuffer(&db, 24, 32)
.expect("Could not create FB");
println!("{:#?}", mode);
println!("{:#?}", fb);
println!("{:#?}", db);
// Set the crtc
// On many setups, this requires root access.
card.set_crtc(crtc.handle(), Some(fb), (0, 0), &[con.handle()], Some(mode))
.expect("Could not set CRTC");
let five_seconds = ::std::time::Duration::from_millis(5000);
::std::thread::sleep(five_seconds);
card.destroy_framebuffer(fb).unwrap();
card.destroy_dumb_buffer(db).unwrap();
}
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