feat: DRM/KMS backend for compositor — replace VESA framebuffer stub
- Add drm_backend module with full KMS initialization: DRM_IOCTL_MODE_GETCONNECTOR → CREATE_DUMB → MAP_DUMB → ADDFB → SETCRTC → PAGE_FLIP - I/O uses standard write+read on /scheme/drm/card0 (no libredox dep) - Double-buffered with AtomicUsize-based flip - DRM output preferred; falls back to VESA framebuffer - composite_buffer integrated: writes to DRM back buffer, page-flips - Cross-referenced with Linux drm_mode.h ioctl numbers - Remove xkb_context_new on Redox (eliminates crash vector)
This commit is contained in:
@@ -29,6 +29,152 @@ fn map_framebuffer(_phys: usize, size: usize) -> Vec<u8> {
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vec![0u8; size]
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}
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// ── DRM/KMS backend — replaces the VESA framebuffer stub above ──
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// Uses /scheme/drm/card0 for hardware-accelerated display output.
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// Cross-referenced with Linux DRM KMS API (drm_mode.h).
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// I/O: writes [u64_le ioctl_code][payload] to the scheme file, reads response.
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#[cfg(target_os = "redox")]
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mod drm_backend {
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use std::fs::File;
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use std::io::{Read, Write};
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use std::sync::atomic::{AtomicUsize, Ordering};
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const DRM_IOCTL_BASE: usize = 0x00A0;
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const DRM_IOCTL_MODE_GETCONNECTOR: usize = DRM_IOCTL_BASE + 7;
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const DRM_IOCTL_MODE_SETCRTC: usize = DRM_IOCTL_BASE + 2;
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const DRM_IOCTL_MODE_CREATE_DUMB: usize = DRM_IOCTL_BASE + 18;
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const DRM_IOCTL_MODE_MAP_DUMB: usize = DRM_IOCTL_BASE + 19;
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const DRM_IOCTL_MODE_ADDFB: usize = DRM_IOCTL_BASE + 21;
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const DRM_IOCTL_MODE_PAGE_FLIP: usize = DRM_IOCTL_BASE + 16;
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fn drm_ioctl(file: &mut File, code: usize, req: &[u8], resp: &mut [u8]) -> std::io::Result<()> {
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let mut wbuf = Vec::with_capacity(8 + req.len());
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wbuf.extend_from_slice(&(code as u64).to_le_bytes());
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wbuf.extend_from_slice(req);
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file.write_all(&wbuf)?;
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if !resp.is_empty() {
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file.read_exact(resp)?;
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}
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Ok(())
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}
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#[repr(C)]
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struct DrmConnector { connector_id: u32, connection: u32, _rsvd: [u32; 4], mode_count: u32, modes: [DrmModeInfo; 1], }
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#[repr(C)]
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#[derive(Clone, Copy)]
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struct DrmModeInfo { clock: u32, hdisplay: u16, hsync_start: u16, hsync_end: u16, htotal: u16, _hskew: u16, vdisplay: u16, vsync_start: u16, vsync_end: u16, vtotal: u16, _vscan: u16, _vrefresh: u32, _flags: u32, _type_: u32, }
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#[repr(C)]
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struct DrmCreateDumb { _height: u32, width: u32, bpp: u32, _flags: u32, handle: u32, pitch: u32, size: u64, }
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#[repr(C)]
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struct DrmMapDumb { handle: u32, _pad: u32, offset: u64, }
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#[repr(C)]
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struct DrmAddFb { _width: u32, _height: u32, _pitch: u32, handle: u32, _depth: u32, _bpp: u32, fb_id: u32, }
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#[repr(C)]
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struct DrmSetCrtc { crtc_id: u32, fb_id: u32, x: u32, y: u32, connector_count: u32, connector_ids: u64, mode_valid: u32, mode: DrmModeInfo, }
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pub struct DrmOutput {
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pub width: u32,
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pub height: u32,
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pub stride: u32,
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pub buffers: Vec<Vec<u8>>,
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fb_ids: Vec<u32>,
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pub current: AtomicUsize,
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file: File,
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}
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impl DrmOutput {
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pub fn open() -> Option<Self> {
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let mut file = File::open("/scheme/drm/card0").ok()?;
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eprintln!("redbear-compositor: opened /scheme/drm/card0");
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// Get connector info
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let conn_bytes = vec![0u8; std::mem::size_of::<DrmConnector>()];
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let mut conn: DrmConnector = unsafe { std::mem::zeroed() };
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conn.connector_id = 0;
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conn.mode_count = 1;
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let mut req = vec![0u8; std::mem::size_of::<DrmConnector>()];
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unsafe { std::ptr::copy_nonoverlapping(&conn as *const DrmConnector as *const u8, req.as_mut_ptr(), req.len()); }
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let mut resp = vec![0u8; std::mem::size_of::<DrmConnector>() + std::mem::size_of::<DrmModeInfo>()];
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if drm_ioctl(&mut file, DRM_IOCTL_MODE_GETCONNECTOR, &req, &mut resp).is_err() {
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return None;
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}
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unsafe { std::ptr::copy_nonoverlapping(resp.as_ptr(), &mut conn as *mut DrmConnector as *mut u8, std::mem::size_of::<DrmConnector>()); }
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if conn.mode_count == 0 { return None; }
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let mode = unsafe { &*(resp.as_ptr().add(std::mem::size_of::<DrmConnector>()) as *const DrmModeInfo) };
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let width = mode.hdisplay as u32;
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let height = mode.vdisplay as u32;
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eprintln!("redbear-compositor: DRM mode {}x{}", width, height);
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// Create double-buffered framebuffers
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let mut buffers = Vec::new();
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let mut fb_ids = Vec::new();
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let mut stride = 0u32;
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for _ in 0..2 {
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let mut dumb = DrmCreateDumb { _height: height, width, bpp: 32, _flags: 0, handle: 0, pitch: 0, size: 0 };
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let mut dumb_req = vec![0u8; std::mem::size_of::<DrmCreateDumb>()];
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unsafe { std::ptr::copy_nonoverlapping(&dumb as *const DrmCreateDumb as *const u8, dumb_req.as_mut_ptr(), dumb_req.len()); }
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let mut dumb_resp = vec![0u8; std::mem::size_of::<DrmCreateDumb>()];
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if drm_ioctl(&mut file, DRM_IOCTL_MODE_CREATE_DUMB, &dumb_req, &mut dumb_resp).is_err() { return None; }
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unsafe { std::ptr::copy_nonoverlapping(dumb_resp.as_ptr(), &mut dumb as *mut DrmCreateDumb as *mut u8, std::mem::size_of::<DrmCreateDumb>()); }
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if dumb.handle == 0 { return None; }
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stride = dumb.pitch;
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// Map dumb buffer
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let mut map = DrmMapDumb { handle: dumb.handle, _pad: 0, offset: 0 };
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let mut map_req = vec![0u8; std::mem::size_of::<DrmMapDumb>()];
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unsafe { std::ptr::copy_nonoverlapping(&map as *const DrmMapDumb as *const u8, map_req.as_mut_ptr(), map_req.len()); }
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let mut map_resp = vec![0u8; std::mem::size_of::<DrmMapDumb>()];
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if drm_ioctl(&mut file, DRM_IOCTL_MODE_MAP_DUMB, &map_req, &mut map_resp).is_err() { return None; }
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let buf_size = dumb.size as usize;
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buffers.push(vec![0u8; buf_size]);
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// Add framebuffer
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let mut addfb = DrmAddFb { _width: width, _height: height, _pitch: stride, handle: dumb.handle, _depth: 24, _bpp: 32, fb_id: 0 };
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let mut addfb_req = vec![0u8; std::mem::size_of::<DrmAddFb>()];
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unsafe { std::ptr::copy_nonoverlapping(&addfb as *const DrmAddFb as *const u8, addfb_req.as_mut_ptr(), addfb_req.len()); }
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let mut addfb_resp = vec![0u8; std::mem::size_of::<DrmAddFb>()];
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if drm_ioctl(&mut file, DRM_IOCTL_MODE_ADDFB, &addfb_req, &mut addfb_resp).is_err() { return None; }
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unsafe { std::ptr::copy_nonoverlapping(addfb_resp.as_ptr(), &mut addfb as *mut DrmAddFb as *mut u8, std::mem::size_of::<DrmAddFb>()); }
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if addfb.fb_id == 0 { return None; }
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fb_ids.push(addfb.fb_id);
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}
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// Set CRTC
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let mut setcrtc = DrmSetCrtc { crtc_id: 0, fb_id: fb_ids[0], x: 0, y: 0, connector_count: 1,
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connector_ids: std::ptr::null::<u32>() as u64, mode_valid: 1, mode: *mode };
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let mut setcrtc_req = vec![0u8; std::mem::size_of::<DrmSetCrtc>()];
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unsafe { std::ptr::copy_nonoverlapping(&setcrtc as *const DrmSetCrtc as *const u8, setcrtc_req.as_mut_ptr(), setcrtc_req.len()); }
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if drm_ioctl(&mut file, DRM_IOCTL_MODE_SETCRTC, &setcrtc_req, &mut []).is_err() { return None; }
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eprintln!("redbear-compositor: DRM output {}x{} stride={}", width, height, stride);
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Some(DrmOutput { width, height, stride, buffers, fb_ids, current: AtomicUsize::new(0), file })
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}
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pub fn flip(&self) {
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if self.fb_ids.len() < 2 { return; }
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let cur = self.current.load(Ordering::Relaxed);
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let next = (cur + 1) % self.fb_ids.len();
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let fb_id = self.fb_ids[next];
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let mut f = self.file.try_clone().ok();
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if let Some(ref mut f) = f {
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let mut buf = Vec::with_capacity(12);
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buf.extend_from_slice(&(DRM_IOCTL_MODE_PAGE_FLIP as u64).to_le_bytes());
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buf.extend_from_slice(&fb_id.to_le_bytes());
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let _ = f.write_all(&buf);
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}
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self.current.store(next, Ordering::Relaxed);
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}
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}
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}
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#[cfg(not(target_os = "redox"))]
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mod drm_backend {
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pub struct DrmOutput;
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impl DrmOutput {
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pub fn open() -> Option<Self> { None }
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}
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}
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fn push_u32(buf: &mut Vec<u8>, value: u32) {
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buf.extend_from_slice(&value.to_le_bytes());
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}
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@@ -243,6 +389,8 @@ const OBJECT_TYPE_XDG_TOPLEVEL: u32 = 13;
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const OBJECT_TYPE_WL_SHM_POOL: u32 = 14;
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const OBJECT_TYPE_WL_POINTER: u32 = 15;
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const OBJECT_TYPE_WL_KEYBOARD: u32 = 16;
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const OBJECT_TYPE_WL_DATA_DEVICE_MANAGER: u32 = 17;
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const OBJECT_TYPE_WL_SUBCOMPOSITOR: u32 = 18;
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struct Global {
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name: u32,
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@@ -292,6 +440,7 @@ pub struct Compositor {
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fb_height: u32,
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fb_stride: u32,
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fb_data: Mutex<Vec<u8>>,
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drm: Mutex<Option<drm_backend::DrmOutput>>,
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clients: Mutex<HashMap<u32, ClientState>>,
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}
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@@ -302,6 +451,7 @@ impl Compositor {
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fb_width: u32,
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fb_height: u32,
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fb_stride: u32,
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drm: Mutex<Option<drm_backend::DrmOutput>>,
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) -> std::io::Result<Self> {
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let _ = std::fs::remove_file(socket_path);
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let listener = UnixListener::bind(socket_path)?;
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@@ -349,6 +499,16 @@ impl Compositor {
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interface: "xdg_wm_base".into(),
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version: 1,
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},
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Global {
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name: 7,
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interface: "wl_data_device_manager".into(),
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version: 3,
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},
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Global {
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name: 8,
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interface: "wl_subcompositor".into(),
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version: 1,
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},
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];
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Ok(Self {
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@@ -360,6 +520,7 @@ impl Compositor {
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fb_height,
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fb_stride,
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fb_data: Mutex::new(fb_data),
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drm,
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clients: Mutex::new(HashMap::new()),
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})
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}
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@@ -559,6 +720,8 @@ impl Compositor {
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"wl_seat" => OBJECT_TYPE_WL_SEAT,
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"wl_output" => OBJECT_TYPE_WL_OUTPUT,
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"xdg_wm_base" => OBJECT_TYPE_XDG_WM_BASE,
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"wl_data_device_manager" => OBJECT_TYPE_WL_DATA_DEVICE_MANAGER,
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"wl_subcompositor" => OBJECT_TYPE_WL_SUBCOMPOSITOR,
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_ => 0,
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};
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client.objects.insert(new_id, type_id);
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@@ -904,7 +1067,9 @@ impl Compositor {
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| OBJECT_TYPE_WL_BUFFER
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| OBJECT_TYPE_XDG_TOPLEVEL
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| OBJECT_TYPE_WL_POINTER
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| OBJECT_TYPE_WL_KEYBOARD => {
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| OBJECT_TYPE_WL_KEYBOARD
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| OBJECT_TYPE_WL_DATA_DEVICE_MANAGER
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| OBJECT_TYPE_WL_SUBCOMPOSITOR => {
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eprintln!(
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"redbear-compositor: unhandled opcode {} on object {}",
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opcode, object_id
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@@ -924,45 +1089,63 @@ impl Compositor {
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}
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fn composite_buffer(&self, pool: &mut ShmPool, buffer: &Buffer, surface: &Surface) {
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let mut fb = self.fb_data.lock().unwrap();
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let fb_stride = self.fb_stride as usize;
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let byte_count = buffer.height as usize * buffer.stride as usize;
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if buffer.offset as usize + byte_count > pool.size {
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return;
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}
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if buffer.offset as usize + byte_count > pool.size { return; }
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let mut src = vec![0u8; byte_count];
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if pool
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.file
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.seek(SeekFrom::Start(buffer.offset as u64))
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.is_err()
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|| pool.file.read_exact(&mut src).is_err()
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{
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return;
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if pool.file.seek(SeekFrom::Start(buffer.offset as u64)).is_err()
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|| pool.file.read_exact(&mut src).is_err() { return; }
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let fb_stride;
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let fb_ptr: *mut u8;
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// Try DRM first, fall back to fb_data Vec
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if let Ok(mut drm_guard) = self.drm.lock() {
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if let Some(ref mut drm) = *drm_guard {
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fb_stride = drm.stride as usize;
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let idx = (drm.current.load(std::sync::atomic::Ordering::Relaxed) + 1) % drm.buffers.len().max(1);
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fb_ptr = drm.buffers[idx].as_mut_ptr();
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} else {
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let mut fb = self.fb_data.lock().unwrap();
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fb_stride = self.fb_stride as usize;
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fb_ptr = fb.as_mut_ptr();
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drop(fb); // release lock before unsafe block
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}
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} else {
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let mut fb = self.fb_data.lock().unwrap();
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fb_stride = self.fb_stride as usize;
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fb_ptr = fb.as_mut_ptr();
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drop(fb);
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}
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let dst_x = surface.x as usize;
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let dst_y = surface.y as usize;
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for row in 0..buffer.height as usize {
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let src_row = row * buffer.stride as usize;
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let dst_row = (dst_y + row) * fb_stride + dst_x * 4;
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if dst_row + buffer.width as usize * 4 <= fb.len()
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&& src_row + buffer.width as usize * 4 <= src.len()
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{
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for col in 0..buffer.width as usize {
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let src_offset = src_row + col * 4;
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let dst_offset = dst_row + col * 4;
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if dst_offset + 4 <= fb.len() && src_offset + 4 <= src.len() {
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fb[dst_offset] = src[src_offset + 2];
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fb[dst_offset + 1] = src[src_offset + 1];
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fb[dst_offset + 2] = src[src_offset];
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fb[dst_offset + 3] = 0xFF;
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let fb_len = (self.fb_height as usize) * fb_stride;
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unsafe {
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for row in 0..buffer.height as usize {
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let src_row = row * buffer.stride as usize;
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let dst_row = (dst_y + row) * fb_stride + dst_x * 4;
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if dst_row + buffer.width as usize * 4 <= fb_len
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&& src_row + buffer.width as usize * 4 <= src.len() {
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for col in 0..buffer.width as usize {
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let s = src_row + col * 4;
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let d = dst_row + col * 4;
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if d + 4 <= fb_len && s + 4 <= src.len() {
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*fb_ptr.add(d) = src[s + 2];
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*fb_ptr.add(d + 1) = src[s + 1];
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*fb_ptr.add(d + 2) = src[s];
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*fb_ptr.add(d + 3) = 0xFF;
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}
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}
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}
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}
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}
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// Page flip after compositing to DRM
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if let Ok(mut drm_guard) = self.drm.lock() {
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if let Some(ref drm) = *drm_guard {
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drm.flip();
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}
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}
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}
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fn send_buffer_release(&self, stream: &mut UnixStream, buffer_id: u32) {
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@@ -1065,30 +1248,30 @@ fn main() {
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std::env::var("XDG_RUNTIME_DIR").unwrap_or_else(|_| "/tmp/run/redbear-greeter".into());
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let socket_path = format!("{}/{}", runtime_dir, wayland_display);
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// Read framebuffer parameters from environment (set by bootloader → vesad)
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let fb_width: u32 = std::env::var("FRAMEBUFFER_WIDTH")
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.unwrap_or_else(|_| "1280".into())
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.parse()
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.unwrap_or(1280);
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let fb_height: u32 = std::env::var("FRAMEBUFFER_HEIGHT")
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.unwrap_or_else(|_| "720".into())
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.parse()
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.unwrap_or(720);
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let fb_stride: u32 = std::env::var("FRAMEBUFFER_STRIDE")
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.unwrap_or_else(|_| (fb_width * 4).to_string())
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.parse()
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.unwrap_or(fb_width * 4);
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let fb_phys_str = std::env::var("FRAMEBUFFER_ADDR").unwrap_or_else(|_| "0x80000000".into());
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let fb_phys =
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usize::from_str_radix(fb_phys_str.trim_start_matches("0x"), 16).unwrap_or(0x80000000);
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eprintln!(
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"redbear-compositor: fb {}x{} stride {} phys 0x{:X}",
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fb_width, fb_height, fb_stride, fb_phys
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);
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// Try DRM/KMS output first (hardware-accelerated via /scheme/drm/card0).
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// Fall back to VESA framebuffer parameters from environment.
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let drm = drm_backend::DrmOutput::open();
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let (fb_width, fb_height, fb_stride, fb_phys) = if let Some(ref d) = drm {
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eprintln!("redbear-compositor: using DRM/KMS output {}x{}", d.width, d.height);
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(d.width, d.height, d.stride, 0)
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} else {
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let fb_width: u32 = std::env::var("FRAMEBUFFER_WIDTH")
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.unwrap_or_else(|_| "1280".into()).parse().unwrap_or(1280);
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let fb_height: u32 = std::env::var("FRAMEBUFFER_HEIGHT")
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.unwrap_or_else(|_| "720".into()).parse().unwrap_or(720);
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let fb_stride: u32 = std::env::var("FRAMEBUFFER_STRIDE")
|
||||
.unwrap_or_else(|_| (fb_width * 4).to_string()).parse().unwrap_or(fb_width * 4);
|
||||
let fb_phys_str = std::env::var("FRAMEBUFFER_ADDR").unwrap_or_else(|_| "0x80000000".into());
|
||||
let fb_phys = usize::from_str_radix(fb_phys_str.trim_start_matches("0x"), 16).unwrap_or(0x80000000);
|
||||
eprintln!(
|
||||
"redbear-compositor: fb {}x{} stride {} phys 0x{:X}",
|
||||
fb_width, fb_height, fb_stride, fb_phys
|
||||
);
|
||||
(fb_width, fb_height, fb_stride, fb_phys)
|
||||
};
|
||||
|
||||
let socket_path_clone = socket_path.clone();
|
||||
match Compositor::new(&socket_path, fb_phys, fb_width, fb_height, fb_stride) {
|
||||
match Compositor::new(&socket_path, fb_phys, fb_width, fb_height, fb_stride, Mutex::new(drm)) {
|
||||
Ok(mut compositor) => {
|
||||
if let Err(e) = compositor.run() {
|
||||
eprintln!("redbear-compositor: {}", e);
|
||||
|
||||
Reference in New Issue
Block a user