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use sdl2::pixels::PixelFormatEnum::RGB24;
use sdl2::render::{Canvas, RenderTarget, Texture, TextureCreator};
use std::sync::RwLock;
#[derive(Debug, Clone, Copy)]
pub struct Point {
pub x: u16,
pub y: u16,
}
#[derive(Debug, Clone, Copy)]
pub struct Color {
pub r: u8,
pub g: u8,
pub b: u8,
}
pub trait Video {
fn draw_point(&self, point: Point, color: Color);
fn present(&self);
fn clear(&self);
}
pub struct NullVideo;
impl Video for NullVideo {
fn draw_point(&self, _point: Point, _color: Color) {}
fn present(&self) {}
fn clear(&self) {}
}
pub struct TextureBufferedVideo<'a> {
buffer: RwLock<Vec<Color>>,
width: u32,
height: u32,
frame: RwLock<Texture<'a>>,
}
impl<'a> TextureBufferedVideo<'a> {
pub fn new<T>(
texture_creator: &'a TextureCreator<T>,
width: u32,
height: u32,
) -> Result<Self, sdl2::render::TextureValueError> {
let black = Color { r: 0, g: 0, b: 0 };
let buffer = vec![black; width as usize * height as usize];
let buffer = RwLock::new(buffer);
let frame = texture_creator.create_texture_streaming(RGB24, width, height)?;
let frame = RwLock::new(frame);
Ok(TextureBufferedVideo {
buffer,
frame,
width,
height,
})
}
pub fn copy_to(&self, canvas: &mut Canvas<impl RenderTarget>) -> Result<(), String> {
let current_frame = self.frame.read().unwrap();
canvas.copy(¤t_frame, None, None)?;
Ok(())
}
}
impl<'a, 'b> Video for TextureBufferedVideo<'b> {
fn draw_point(&self, point: Point, color: Color) {
let mut buffer = self.buffer.write().unwrap();
let offset = point.y as usize * self.width as usize + point.x as usize;
buffer[offset] = color;
}
fn present(&self) {
let buffer = self.buffer.read().unwrap();
let mut frame = self.frame.write().unwrap();
frame
.with_lock(None, |frame_buffer, pitch| {
for y in 0..self.height {
for x in 0..self.width {
let offset = y as usize * self.width as usize + x as usize;
let color = buffer[offset];
let frame_offset = y as usize * pitch + (x as usize * 3);
frame_buffer[frame_offset] = color.r;
frame_buffer[frame_offset + 1] = color.g;
frame_buffer[frame_offset + 2] = color.b;
}
}
})
.unwrap();
}
fn clear(&self) {}
}
impl<'a, V> Video for &'a V
where
V: Video,
{
fn draw_point(&self, point: Point, color: Color) {
(*self).draw_point(point, color);
}
fn present(&self) {
(*self).present();
}
fn clear(&self) {
(*self).clear();
}
}