Initial OpenGL core support

mmmmmm, this really is NOT as clean as I want it to be, but here it is!
This commit is contained in:
Lily Tsuru 2024-08-05 08:49:40 -04:00
parent 93525cb291
commit b972478ee9
8 changed files with 457 additions and 31 deletions

34
Cargo.lock generated
View file

@ -191,6 +191,26 @@ dependencies = [
"windows-sys", "windows-sys",
] ]
[[package]]
name = "gl"
version = "0.14.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a94edab108827d67608095e269cf862e60d920f144a5026d3dbcfd8b877fb404"
dependencies = [
"gl_generator",
]
[[package]]
name = "gl_generator"
version = "0.14.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1a95dfc23a2b4a9a2f5ab41d194f8bfda3cabec42af4e39f08c339eb2a0c124d"
dependencies = [
"khronos_api",
"log",
"xml-rs",
]
[[package]] [[package]]
name = "glob" name = "glob"
version = "0.3.1" version = "0.3.1"
@ -237,6 +257,12 @@ dependencies = [
"either", "either",
] ]
[[package]]
name = "khronos_api"
version = "3.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e2db585e1d738fc771bf08a151420d3ed193d9d895a36df7f6f8a9456b911ddc"
[[package]] [[package]]
name = "lazy_static" name = "lazy_static"
version = "1.5.0" version = "1.5.0"
@ -433,6 +459,8 @@ dependencies = [
"anyhow", "anyhow",
"cc", "cc",
"clap", "clap",
"gl",
"gl_generator",
"libvnc-sys", "libvnc-sys",
"retro_frontend", "retro_frontend",
"tracing", "tracing",
@ -785,3 +813,9 @@ checksum = "68a9bda4691f099d435ad181000724da8e5899daa10713c2d432552b9ccd3a6f"
dependencies = [ dependencies = [
"memchr", "memchr",
] ]
[[package]]
name = "xml-rs"
version = "0.8.20"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "791978798f0597cfc70478424c2b4fdc2b7a8024aaff78497ef00f24ef674193"

View file

@ -21,11 +21,22 @@ use tracing::{error, info};
/// Only one instance of Frontend can be active in an application. /// Only one instance of Frontend can be active in an application.
pub(crate) static mut FRONTEND: *mut Frontend = std::ptr::null_mut(); pub(crate) static mut FRONTEND: *mut Frontend = std::ptr::null_mut();
/// A "Generalized" type for OpenGL's "getProcAddress" idiom
pub type GlGetProcAddress = *mut unsafe extern "C" fn(name: *const i8) -> unsafe extern "C" fn();
/// Initalization data for HW OpenGL cores.
pub struct HwGlInitData {
pub get_proc_address: GlGetProcAddress,
}
/// Interface for the frontend to call to user code. /// Interface for the frontend to call to user code.
pub trait FrontendInterface { pub trait FrontendInterface {
/// Called when video is updated. /// Called when video is updated.
fn video_update(&mut self, slice: &[u32], pitch: u32); fn video_update(&mut self, slice: &[u32], pitch: u32);
/// Called when video is updated and the core is using HW OpenGL rendering.
fn video_update_gl(&mut self);
/// Called when resize occurs. /// Called when resize occurs.
fn video_resize(&mut self, width: u32, height: u32); fn video_resize(&mut self, width: u32, height: u32);
@ -36,10 +47,8 @@ pub trait FrontendInterface {
/// Called to poll input /// Called to poll input
fn input_poll(&mut self); fn input_poll(&mut self);
// TODO(lily): Provide APIs for gathering a GL context/fbo. /// Initalize hardware accelerated rendering using OpenGL.
// This should be abstracted so if a frontend written on top of retro_frontend fn hw_gl_init(&mut self) -> HwGlInitData;
// wants to give a FBO from a GLX/WGL/windowed whatever context, it can,
// but a headless frontend can itself provide a headless EGL context just the same.
} }
/// Per-core settings /// Per-core settings
@ -73,6 +82,9 @@ pub struct Frontend {
pub(crate) fb_height: u32, pub(crate) fb_height: u32,
pub(crate) fb_pitch: u32, pub(crate) fb_pitch: u32,
// HW OpenGL FBO id.
pub(crate) gl_fbo_id: u32,
/// The "system" directory. Used for BIOS roms. /// The "system" directory. Used for BIOS roms.
pub(crate) system_directory: CString, pub(crate) system_directory: CString,
@ -109,6 +121,7 @@ impl Frontend {
fb_width: 0, fb_width: 0,
fb_height: 0, fb_height: 0,
fb_pitch: 0, fb_pitch: 0,
gl_fbo_id: 0,
// TODO: We should let callers set these, probably. // TODO: We should let callers set these, probably.
// For now, this is probably fine. // For now, this is probably fine.
@ -431,6 +444,10 @@ impl Frontend {
(self.fb_width, self.fb_height) (self.fb_width, self.fb_height)
} }
pub fn set_gl_fbo(&mut self, id: u32) {
self.gl_fbo_id = id;
}
pub fn reset(&mut self) { pub fn reset(&mut self) {
let core_api = self.core_api.as_ref().unwrap(); let core_api = self.core_api.as_ref().unwrap();

View file

@ -8,6 +8,11 @@ use std::ffi;
use tracing::{debug, error, info}; use tracing::{debug, error, info};
/// This function is used with HW OpenGL cores to transfer the current FBO's ID.
unsafe extern "C" fn hw_gl_get_framebuffer() -> usize {
(*FRONTEND).gl_fbo_id as usize
}
pub(crate) unsafe extern "C" fn environment_callback( pub(crate) unsafe extern "C" fn environment_callback(
environment_command: u32, environment_command: u32,
data: *mut ffi::c_void, data: *mut ffi::c_void,
@ -99,6 +104,33 @@ pub(crate) unsafe extern "C" fn environment_callback(
return true; return true;
} }
ENVIRONMENT_SET_HW_RENDER => {
let hw_render = (data as *mut HwRenderCallback).as_mut().unwrap();
let hw_render_context_type =
HwContextType::from_uint(hw_render.context_type).expect("FUCK");
if hw_render_context_type != HwContextType::OpenGL && hw_render_context_type != HwContextType::OpenGLCore {
error!(
"Core is trying to request an context type we don't support ({:?})",
hw_render_context_type
);
return false;
}
info!("Core requesting context type {:?}", hw_render_context_type);
let init_data = (*(*FRONTEND).interface).hw_gl_init();
hw_render.get_current_framebuffer = hw_gl_get_framebuffer;
hw_render.get_proc_address = std::mem::transmute(init_data.get_proc_address);
// reset context
(hw_render.context_reset)();
return true;
}
ENVIRONMENT_GET_VARIABLE => { ENVIRONMENT_GET_VARIABLE => {
// Make sure the core actually is giving us a pointer to a *Variable // Make sure the core actually is giving us a pointer to a *Variable
// so we can fill it in. // so we can fill it in.
@ -179,9 +211,19 @@ pub(crate) unsafe extern "C" fn video_refresh_callback(
//info!("Video refresh called, {width}, {height}, {pitch}"); //info!("Video refresh called, {width}, {height}, {pitch}");
if (*FRONTEND).fb_width != width || (*FRONTEND).fb_height != height {
(*(*FRONTEND).interface).video_resize(width, height);
}
// bleh // bleh
(*FRONTEND).fb_width = width; (*FRONTEND).fb_width = width;
(*FRONTEND).fb_height = height; (*FRONTEND).fb_height = height;
if pixels == (-1i64 as *const ffi::c_void) {
(*(*FRONTEND).interface).video_update_gl();
return;
}
(*FRONTEND).fb_pitch = (*FRONTEND).fb_pitch =
pitch as u32 / util::bytes_per_pixel_from_libretro((*FRONTEND).pixel_format); pitch as u32 / util::bytes_per_pixel_from_libretro((*FRONTEND).pixel_format);
@ -200,9 +242,6 @@ pub(crate) unsafe extern "C" fn video_refresh_callback(
(*FRONTEND) (*FRONTEND)
.converted_pixel_buffer .converted_pixel_buffer
.resize((pitch * height as usize) as usize, 0); .resize((pitch * height as usize) as usize, 0);
// some cores are stupid
(*(*FRONTEND).interface).video_resize(width, height);
} }
// TODO: Make this convert from weird pitches to native resolution where possible. // TODO: Make this convert from weird pitches to native resolution where possible.
@ -217,7 +256,8 @@ pub(crate) unsafe extern "C" fn video_refresh_callback(
} }
} }
(*(*FRONTEND).interface).video_update(&(*FRONTEND).converted_pixel_buffer[..], pitch as u32); (*(*FRONTEND).interface)
.video_update(&(*FRONTEND).converted_pixel_buffer[..], pitch as u32);
} }
_ => { _ => {
let pixel_data_slice = std::slice::from_raw_parts( let pixel_data_slice = std::slice::from_raw_parts(

View file

@ -7,6 +7,7 @@ publish = false
[dependencies] [dependencies]
anyhow = "1.0.86" anyhow = "1.0.86"
clap = { version = "4.5.6", features = ["cargo"] } clap = { version = "4.5.6", features = ["cargo"] }
gl = "0.14.0"
libvnc-sys = "0.1.4" libvnc-sys = "0.1.4"
retro_frontend = { path = "../retro_frontend" } retro_frontend = { path = "../retro_frontend" }
tracing = "0.1.40" tracing = "0.1.40"
@ -14,3 +15,4 @@ tracing-subscriber = "0.3.18"
[build-dependencies] [build-dependencies]
cc = "1.0.99" cc = "1.0.99"
gl_generator = "0.14.0"

View file

@ -1,8 +1,33 @@
use cc; use cc;
fn main() { use gl_generator::{Api, Fallbacks, Profile, Registry, StaticGenerator};
let mut build = cc::Build::new(); use std::env;
use std::fs::File;
use std::path::Path;
fn main() {
// EGL
let dest = env::var("OUT_DIR").unwrap();
let mut file = File::create(&Path::new(&dest).join("egl_bindings.rs")).unwrap();
Registry::new(Api::Egl, (1, 5), Profile::Core, Fallbacks::All, [
"EGL_EXT_platform_base",
"EGL_EXT_device_base",
// This allows getting OpenGL APIs via eglGetProcAddress()
"EGL_KHR_get_all_proc_addresses",
"EGL_KHR_client_get_all_proc_addresses",
"EGL_EXT_platform_device"
])
.write_bindings(StaticGenerator, &mut file)
.unwrap();
// C++
let mut build = cc::Build::new();
build build
.emit_rerun_if_env_changed(true) .emit_rerun_if_env_changed(true)
.cpp(true) .cpp(true)

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@ -0,0 +1,34 @@
#[allow(non_camel_case_types)]
mod egl_impl {
pub type khronos_utime_nanoseconds_t = khronos_uint64_t;
pub type khronos_uint64_t = u64;
pub type khronos_ssize_t = std::ffi::c_long;
pub type EGLint = i32;
pub type EGLNativeDisplayType = *const std::ffi::c_void;
pub type EGLNativePixmapType = *const std::ffi::c_void;
pub type EGLNativeWindowType = *const std::ffi::c_void;
pub type NativeDisplayType = EGLNativeDisplayType;
pub type NativePixmapType = EGLNativePixmapType;
pub type NativeWindowType = EGLNativeWindowType;
include!(concat!(env!("OUT_DIR"), "/egl_bindings.rs"));
pub type GetPlatformDisplayExt = unsafe extern "C" fn(
platform: types::EGLenum,
native_display: *const std::ffi::c_void,
attrib_list: *const types::EGLint,
) -> types::EGLDisplay;
pub type QueryDevicesExt = unsafe extern "C" fn(
max_devices: self::types::EGLint,
devices: *mut self::types::EGLDeviceEXT,
devices: *mut EGLint,
) -> types::EGLBoolean;
// link EGL as a library dependency
#[link(name = "EGL")]
extern "C" {}
}
pub use egl_impl::*;

View file

@ -1,9 +1,9 @@
use std::{net::Ipv4Addr, path::Path}; use std::{net::Ipv4Addr, path::Path, ptr::addr_of_mut};
use anyhow::Result; use anyhow::Result;
use retro_frontend::{ use retro_frontend::{
frontend::{Frontend, FrontendInterface}, frontend::{Frontend, FrontendInterface, HwGlInitData},
input_devices::{InputDevice, RetroPad}, input_devices::{InputDevice, RetroPad},
}; };
use tracing::Level; use tracing::Level;
@ -11,6 +11,32 @@ use tracing_subscriber::FmtSubscriber;
use clap::{arg, command, value_parser}; use clap::{arg, command, value_parser};
extern "system" fn opengl_message_callback(
source: gl::types::GLenum,
_type: gl::types::GLenum,
id: gl::types::GLuint,
severity: gl::types::GLenum,
length: gl::types::GLsizei,
message: *const gl::types::GLchar,
user: *mut std::ffi::c_void,
) {
unsafe {
let message = std::ffi::CStr::from_ptr(message);
if _type == gl::DEBUG_TYPE_ERROR {
tracing::error!(
"OpenGL error: {:?} (res {:08x}, id = {:08x}, source = {:08x})",
message,
_type,
id,
source
);
}
}
}
mod egl;
mod rfb; mod rfb;
use rfb::*; use rfb::*;
@ -18,6 +44,15 @@ struct App {
frontend: Option<Box<Frontend>>, frontend: Option<Box<Frontend>>,
rfb_server: Box<RfbServer>, rfb_server: Box<RfbServer>,
pad: RetroPad, pad: RetroPad,
hw_render: bool,
// opengl state shits
texture_id: gl::types::GLuint,
renderbuffer_id: gl::types::GLuint,
fbo_id: gl::types::GLuint,
readback_buffer: Vec<u32>,
} }
impl App { impl App {
@ -26,6 +61,11 @@ impl App {
frontend: None, frontend: None,
rfb_server: RfbServer::new(rfb_config)?, rfb_server: RfbServer::new(rfb_config)?,
pad: RetroPad::new(), pad: RetroPad::new(),
hw_render: false,
texture_id: 0,
renderbuffer_id: 0,
fbo_id: 0,
readback_buffer: Vec::new(),
}); });
// Very very nasty, but honestly it works. // Very very nasty, but honestly it works.
@ -80,6 +120,81 @@ impl App {
Ok(()) Ok(())
} }
fn hw_gl_resize(&mut self, width: u32, height: u32) {
// TODO: if requested, add depth renderbuffer.
unsafe {
if self.fbo_id == 0 {
gl::GenFramebuffers(1, std::ptr::addr_of_mut!(self.fbo_id));
gl::BindFramebuffer(gl::FRAMEBUFFER, self.fbo_id);
} else {
gl::DeleteFramebuffers(1, std::ptr::addr_of_mut!(self.fbo_id));
gl::GenFramebuffers(1, std::ptr::addr_of_mut!(self.fbo_id));
gl::BindFramebuffer(gl::FRAMEBUFFER, self.fbo_id);
}
if self.texture_id == 0 {
gl::GenTextures(1, std::ptr::addr_of_mut!(self.texture_id));
gl::BindTexture(gl::TEXTURE_2D, self.texture_id);
} else {
gl::DeleteTextures(1, std::ptr::addr_of_mut!(self.texture_id));
gl::GenTextures(1, std::ptr::addr_of_mut!(self.texture_id));
gl::BindTexture(gl::TEXTURE_2D, self.texture_id);
}
gl::TexImage2D(
gl::TEXTURE_2D,
0,
gl::RGBA8 as i32,
width as i32,
height as i32,
0,
gl::RGBA,
gl::UNSIGNED_BYTE,
std::ptr::null(),
);
if self.renderbuffer_id != 0 {
gl::GenRenderbuffers(1, std::ptr::addr_of_mut!(self.renderbuffer_id));
gl::BindRenderbuffer(gl::RENDERBUFFER, self.renderbuffer_id);
gl::RenderbufferStorage(
gl::RENDERBUFFER,
gl::DEPTH_COMPONENT,
width as i32,
height as i32,
);
}
gl::FramebufferTexture2D(
gl::FRAMEBUFFER,
gl::COLOR_ATTACHMENT0,
gl::TEXTURE_2D,
self.texture_id,
0,
);
gl::BindTexture(gl::TEXTURE_2D, 0);
gl::FramebufferRenderbuffer(
gl::FRAMEBUFFER,
gl::DEPTH_ATTACHMENT,
gl::RENDERBUFFER,
self.renderbuffer_id,
);
gl::BindRenderbuffer(gl::RENDERBUFFER, 0);
gl::Viewport(0, 0, width as i32, height as i32);
gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
let id = self.fbo_id;
self.get_frontend().set_gl_fbo(id);
self.readback_buffer.resize((width * height) as usize, 0);
}
}
// Main loop // Main loop
fn main_loop(&mut self) -> ! { fn main_loop(&mut self) -> ! {
let frontend = self.get_frontend(); let frontend = self.get_frontend();
@ -101,13 +216,41 @@ impl FrontendInterface for App {
//let height = height * 2; //let height = height * 2;
tracing::info!("Resized to {width}x{height}"); tracing::info!("Resized to {width}x{height}");
// Resize OpenGL
if self.hw_render {
self.hw_gl_resize(width, height);
}
self.rfb_server.resize(width as u16, height as u16); self.rfb_server.resize(width as u16, height as u16);
} }
fn video_update(&mut self, slice: &[u32], pitch: u32) { fn video_update(&mut self, slice: &[u32], pitch: u32) {
//let framebuffer_size = self.get_frontend().get_size(); //let framebuffer_size = self.get_frontend().get_size();
self.rfb_server self.rfb_server.update_buffer(&slice, pitch, false);
.update_buffer(&slice, pitch); }
fn video_update_gl(&mut self) {
let dimensions = self.get_frontend().get_size();
unsafe {
gl::BindFramebuffer(gl::FRAMEBUFFER, self.fbo_id);
// I know this sucks but hey
gl::ReadPixels(
0,
0,
dimensions.0 as i32,
dimensions.1 as i32,
gl::RGBA,
gl::UNSIGNED_BYTE,
self.readback_buffer.as_mut_ptr() as *mut std::ffi::c_void,
);
self.rfb_server.update_buffer(&self.readback_buffer[..], dimensions.0, true);
gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
}
} }
fn audio_sample(&mut self, _slice: &[i16], _size: usize) {} fn audio_sample(&mut self, _slice: &[i16], _size: usize) {}
@ -123,6 +266,112 @@ impl FrontendInterface for App {
} }
} }
} }
fn hw_gl_init(&mut self) -> HwGlInitData {
if self.hw_render {
panic!("Nope!");
}
let display = unsafe {
const NR_DEVICES_MAX: usize = 16;
let mut devices: [egl::types::EGLDeviceEXT; NR_DEVICES_MAX] =
[std::ptr::null(); NR_DEVICES_MAX];
let mut nr_devices_real: egl::EGLint = 0;
let query_devices_ext: egl::QueryDevicesExt = std::mem::transmute(egl::GetProcAddress(
b"eglQueryDevicesEXT\0".as_ptr() as *const i8,
));
let get_platform_display_ext: egl::GetPlatformDisplayExt = std::mem::transmute(
egl::GetProcAddress(b"eglGetPlatformDisplayEXT\0".as_ptr() as *const i8),
);
// load OpenGL functions (using EGL loader. We should probably check the one extension exists)
gl::load_with(|s| {
let str = std::ffi::CString::new(s).expect("you MOTHERFUCKER");
std::mem::transmute(egl::GetProcAddress(str.as_ptr()))
});
tracing::info!("before query devices");
(query_devices_ext)(
NR_DEVICES_MAX as i32,
devices.as_mut_ptr(),
std::ptr::addr_of_mut!(nr_devices_real),
);
tracing::info!("after query devices");
(get_platform_display_ext)(egl::PLATFORM_DEVICE_EXT, devices[0], std::ptr::null())
};
tracing::info!("made EGL display");
let context = unsafe {
const EGL_CONFIG_ATTRIBUTES: [egl::types::EGLenum; 13] = [
egl::SURFACE_TYPE,
egl::PBUFFER_BIT,
egl::BLUE_SIZE,
8,
egl::RED_SIZE,
8,
egl::BLUE_SIZE,
8,
egl::DEPTH_SIZE,
8,
egl::RENDERABLE_TYPE,
egl::OPENGL_BIT,
egl::NONE,
];
let mut egl_major: egl::EGLint = 0;
let mut egl_minor: egl::EGLint = 0;
let mut egl_config_count: egl::EGLint = 0;
let mut config: egl::types::EGLConfig = std::ptr::null();
egl::Initialize(
display,
std::ptr::addr_of_mut!(egl_major),
std::ptr::addr_of_mut!(egl_minor),
);
egl::ChooseConfig(
display,
EGL_CONFIG_ATTRIBUTES.as_ptr() as *const egl::EGLint,
std::ptr::addr_of_mut!(config),
1,
std::ptr::addr_of_mut!(egl_config_count),
);
egl::BindAPI(egl::OPENGL_API);
egl::CreateContext(display, config, egl::NO_CONTEXT, std::ptr::null())
};
unsafe {
egl::MakeCurrent(display, egl::NO_SURFACE, egl::NO_SURFACE, context);
gl::Enable(gl::DEBUG_OUTPUT);
gl::DebugMessageCallback(Some(opengl_message_callback), std::ptr::null());
let dimensions = self.get_frontend().get_size();
self.hw_gl_resize(dimensions.0, dimensions.1);
gl::BindFramebuffer(gl::FRAMEBUFFER, 0);
}
self.hw_render = true;
return unsafe {
HwGlInitData {
get_proc_address: std::mem::transmute::<
_,
retro_frontend::frontend::GlGetProcAddress,
>(egl::GetProcAddress as usize),
}
};
}
} }
fn main() -> Result<()> { fn main() -> Result<()> {
@ -170,7 +419,6 @@ fn main() -> Result<()> {
app.load_core(core_path)?; app.load_core(core_path)?;
if let Some(rom_path) = matches.get_one::<String>("rom") { if let Some(rom_path) = matches.get_one::<String>("rom") {
app.load_game(rom_path)? app.load_game(rom_path)?
} }

View file

@ -20,7 +20,7 @@ pub struct RfbServer {
buttons: [bool; 32], buttons: [bool; 32],
width: u16, width: u16,
height: u16 height: u16,
} }
impl RfbServer { impl RfbServer {
@ -57,7 +57,7 @@ impl RfbServer {
framebuffer: Vec::new(), framebuffer: Vec::new(),
buttons: [false; 32], buttons: [false; 32],
width: config.width, width: config.width,
height: config.height height: config.height,
}); });
// Disable the normal libvnc cursor (it's annoying) // Disable the normal libvnc cursor (it's annoying)
@ -99,8 +99,7 @@ impl RfbServer {
} }
} }
pub fn update_buffer(&mut self, slice: &[u32], pitch: u32) { pub fn update_buffer(&mut self, slice: &[u32], pitch: u32, flipped: bool) {
//self.framebuffer.copy_from_slice(&slice); //self.framebuffer.copy_from_slice(&slice);
let has_disconnected_pitch = pitch != self.width as u32; let has_disconnected_pitch = pitch != self.width as u32;
@ -110,6 +109,31 @@ impl RfbServer {
//} //}
// copy a line at a time (test) // copy a line at a time (test)
if flipped {
let mut scanlines: Vec<&[u32]> = Vec::with_capacity(self.height as usize);
for y in (0..self.height).rev() {
let src_line_off = (y as u32 * pitch) as usize;
let src_slice = &slice[src_line_off..src_line_off + self.width as usize];
scanlines.push(src_slice);
}
for y in (0..self.height) {
let src_line_off = (y as u32 * pitch) as usize;
let mut dest_line_off = src_line_off;
// copy only
if has_disconnected_pitch {
dest_line_off = (y * self.width) as usize;
}
let dest_slice =
&mut self.framebuffer[dest_line_off..dest_line_off + self.width as usize];
dest_slice.copy_from_slice(scanlines[y as usize]);
}
} else {
for y in 0..self.height { for y in 0..self.height {
let src_line_off = (y as u32 * pitch) as usize; let src_line_off = (y as u32 * pitch) as usize;
let mut dest_line_off = src_line_off; let mut dest_line_off = src_line_off;
@ -121,10 +145,12 @@ impl RfbServer {
// Create slices repressenting each part // Create slices repressenting each part
let src_slice = &slice[src_line_off..src_line_off + self.width as usize]; let src_slice = &slice[src_line_off..src_line_off + self.width as usize];
let dest_slice = &mut self.framebuffer[dest_line_off..dest_line_off + self.width as usize]; let dest_slice =
&mut self.framebuffer[dest_line_off..dest_line_off + self.width as usize];
dest_slice.copy_from_slice(src_slice); dest_slice.copy_from_slice(src_slice);
} }
}
unsafe { unsafe {
rfb::bindings::rfbMarkRectAsModified( rfb::bindings::rfbMarkRectAsModified(