atreyabain/porcel8
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[ref] Make framebuffer bool array and add missing implementation

Browse Source
This commit is contained in:
Atreya Bain
2024-03-04 09:40:33 +05:30
parent d443cec6e1
commit 1690c52bac
3 changed files with 43 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
src/device/device.rs
View File

@@ -13,7 +13,7 @@ pub struct Device {
pub memory: Box<[u8; Self::DEVICE_MEMORY_SIZE]>,
pub timer: Timer,
pub stack: Vec<u16>,
pub frame_buffer: Arc<Mutex<Box<[u8;64*32]>>>
pub frame_buffer: Arc<Mutex<Box<[bool;64*32]>>>
}
impl Device {
@@ -21,7 +21,7 @@ impl Device {
pub const FRAME_BUFFER_WIDTH: usize = 64;
pub const FRAME_BUFFER_HEIGHT: usize = 32;
pub const FRAME_BUFFER_SIZE: usize = Self::FRAME_BUFFER_WIDTH*Self::FRAME_BUFFER_HEIGHT;
pub fn new(timer: Timer, fb: Arc<Mutex<Box<[u8;64*32]>>>) -> Device {
pub fn new(timer: Timer, fb: Arc<Mutex<Box<[bool;Device::FRAME_BUFFER_SIZE]>>>) -> Device {
let memory = vec![0u8; Self::DEVICE_MEMORY_SIZE].into_boxed_slice().try_into().unwrap();
log::trace!("Successfully initiated device memory");
Device {
@@ -66,7 +66,8 @@ impl Device {
}
pub fn get_framebuffer_index(x:usize,y:usize)->usize{
/// convert the 2 indices into one
fn get_framebuffer_index(x:usize,y:usize)->usize{
y*Self::FRAME_BUFFER_WIDTH + x
}
pub fn execute_instruction(&mut self, instruction: Instruction) {
@@ -79,7 +80,7 @@ impl Device {
Instruction::ClearScreen => {
let mut frame_buffer = self.frame_buffer.lock().expect("Failed to grab framebuffer for drawing");
for pixel in frame_buffer.iter_mut(){
*pixel = 0;
*pixel = false;
}
log::trace!("ClearScreen")
}
@@ -97,30 +98,41 @@ impl Device {
self.registers.i = value;
}
Instruction::Draw(regx,regy, n) => {
let mut frame_buffer = self.frame_buffer.lock().expect("Failed to grab framebuffer for drawing");
let x = self.registers.v[regx] as usize;
let y = self.registers.v[regy] as usize;
for i in 0..n as usize{
let index = Self::get_framebuffer_index(x,y+i);
let slice_from_memory = self.memory[self.registers.i as usize + i];
for bit_index in (0..8).rev() {
// if i'm going to the next line, stop
if Self::get_framebuffer_index(0, y+1)==index {
break;
}
let bit = (slice_from_memory & (1<<bit_index)) >> bit_index;
let byte = bit * 0xff;
frame_buffer[index+(7-bit_index)] = frame_buffer[index+(7-bit_index)] ^ (byte);
}
}
// TODO fix carry bit
log::warn!("Draw call incomplete");
let toggle_state = self.draw_sprite_at_location(x, y, n);
self.set_flag_register(toggle_state);
}
};
}
///
/// Draw a sprite at location at (x,y) for n pixels long and 8 pixels wide.
/// Returns whether any pixel was toggled
fn draw_sprite_at_location(&mut self, x: usize, y: usize, n: u8)-> bool {
let mut frame_buffer = self.frame_buffer.lock().expect("Failed to grab framebuffer for drawing");
let mut is_pixel_toggled_off = false;
for i in 0..n as usize {
let index = Self::get_framebuffer_index(x, y + i);
let slice_from_memory = self.memory[self.registers.i as usize + i];
for bit_index in (0..8).rev() {
// if i'm going to the next line, stop
if Self::get_framebuffer_index(0, y + 1) == index {
break;
}
let bit_is_true = (slice_from_memory & (1 << bit_index)) == (1<<bit_index) ;
// if the pixel is going to be toggled false, set this flag bit to true
if(frame_buffer[index + (7 - bit_index)] && (bit_is_true)) { is_pixel_toggled_off = true;}
frame_buffer[index + (7 - bit_index)] = frame_buffer[index + (7 - bit_index)] ^ (bit_is_true);
}
}
is_pixel_toggled_off
}
fn set_flag_register(&mut self, x:bool){
self.registers.v[0xf] = if x {1} else { 0 }
}
pub fn set_default_font(&mut self) {
log::info!("Loaded default font from memory");