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use bevy::render::render_resource::TextureFormat;
use bevy::render::texture::TextureFormatPixelInfo;
use crate::{
get_ldtk_tile_scale, Indexer, LdtkLayer, LdtkLevel, SuppliesImage, SuppliesTextureAtlas,
};
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pub fn write_layer_to_texture(
layer: &LdtkLayer,
buffer: &mut Vec<u8>,
format: &TextureFormat,
image: &Image,
atlas: &TextureAtlas,
) {
if !layer.has_tiles() {
return;
}
let tile_size = get_ldtk_tile_scale();
let layer_indexer = Indexer::new(
layer.indexer().width() * tile_size as i64,
layer.indexer().height() * tile_size as i64,
);
let texture_indexer = Indexer::new(image.size().x, image.size().y);
layer.for_each_tile(|x, y, tile| {
let part = match atlas.textures.get(tile.tile.t as usize) {
Some(rect) => rect,
None => return,
};
let real_x = x * tile_size as i64;
let real_y = y * tile_size as i64;
for relative_x in 0..part.width() as usize {
for relative_y in 0..part.height() as usize {
let tile_image_x = part.min.x as usize + relative_x;
let tile_image_y = part.min.y as usize + relative_y;
let tile_index = texture_indexer.index(tile_image_x, tile_image_y);
let output_x = real_x as usize + relative_x;
let output_y = real_y as usize + relative_y;
let output_index = layer_indexer.index(output_x, output_y);
if let Some(target_pixel) =
image.data.chunks_exact(format.pixel_size()).nth(tile_index)
{
if let Some(map_px) = buffer
.chunks_exact_mut(format.pixel_size())
.nth(output_index)
{
if target_pixel.iter().any(|p| p != &0) {
map_px.copy_from_slice(target_pixel);
}
}
};
}
}
});
}
pub fn write_map_to_texture(
level: &LdtkLevel,
buffer: &mut Vec<u8>,
format: &TextureFormat,
image: &Image,
atlas: &TextureAtlas,
) {
for layer in level.layers() {
write_layer_to_texture(layer, buffer, format, image, atlas);
}
}
pub trait Rasterise {
fn write_to_texture(
&self,
buffer: &mut Vec<u8>,
format: &TextureFormat,
images: &impl SuppliesImage,
atlas: &impl SuppliesTextureAtlas,
);
}
impl Rasterise for LdtkLevel {
fn write_to_texture(
&self,
buffer: &mut Vec<u8>,
format: &TextureFormat,
images: &impl SuppliesImage,
atlas: &impl SuppliesTextureAtlas,
) {
for layer in self.layers() {
layer.write_to_texture(buffer, format, images, atlas);
}
}
}
impl Rasterise for LdtkLayer {
fn write_to_texture(
&self,
buffer: &mut Vec<u8>,
format: &TextureFormat,
images: &impl SuppliesImage,
atlas: &impl SuppliesTextureAtlas,
) {
if let Some(atlas) = self
.infer_tileset_name()
.and_then(|tn| atlas.get_atlas_handle(tn))
.and_then(|hn| atlas.get_atlas(hn))
{
if let Some(image) = images.get_image(&atlas.texture) {
write_layer_to_texture(self, buffer, format, image, atlas);
}
}
}
}