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use image::ImageBuffer;
use image::Rgba;
pub const REGION_SIZE: usize = 16 * 8;
pub const CHUNK_HEIGHT: usize = 384;
pub const CHUNK_SIZE: usize = 16;
pub fn image_buffer_blit(
target: &mut ImageBuffer<Rgba<u8>, Vec<u8>>,
source: &ImageBuffer<Rgba<u8>, Vec<u8>>,
offset: (u32, u32),
) {
for (x, y, source_pixel) in source.enumerate_pixels() {
let target_pixel = target.get_pixel_mut(x + offset.0, y + offset.1);
let sa = source_pixel.0[3] as u16;
let new_pixel = Rgba::from([
((target_pixel.0[0] as u16 * (255 - sa)) / 255 + (source_pixel.0[0] as u16 * sa) / 255)
as u8,
((target_pixel.0[1] as u16 * (255 - sa)) / 255 + (source_pixel.0[1] as u16 * sa) / 255)
as u8,
((target_pixel.0[2] as u16 * (255 - sa)) / 255 + (source_pixel.0[2] as u16 * sa) / 255)
as u8,
255 - (((255 - target_pixel.0[3] as u16) * (255 - sa)) / 255) as u8,
]);
*target_pixel = new_pixel;
}
}
pub fn isometric_coord_mapping(x: i32, y: i32, z: i32) -> (u32, u32) {
// const BASE_X: i32 = 1016;
// const BASE_Y: i32 = 2040;
const BASE_X: i32 = 128 - 8;
const BASE_Y: i32 = 2040;
const XDIFF: (i32, i32) = (-8, 4);
const ZDIFF: (i32, i32) = (8, 4);
const YDIFF: (i32, i32) = (0, -8);
let diff = (
XDIFF.0 * x + YDIFF.0 * y + ZDIFF.0 * z,
XDIFF.1 * x + YDIFF.1 * y + ZDIFF.1 * z,
);
let coords = (BASE_X + diff.0, BASE_Y + diff.1);
(coords.0 as u32, coords.1 as u32)
}
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