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use super::PIXEL_SIZE;
use core::ptr::copy_nonoverlapping;
use std::convert::TryInto;
use image::RgbaImage;
/// An object that can be loaded as an image into GPU memory
pub trait LoadableImage {
fn width(&self) -> u32;
fn height(&self) -> u32;
/// # Safety
/// Ensure the ptr is at least width() * PIXEL_SIZE bytes.
unsafe fn copy_row(&self, y: u32, ptr: *mut u8);
/// # Safety
/// Ensure the ptr is at least row_size * height() * PIXEL_SIZE bytes.
unsafe fn copy_into(&self, ptr: *mut u8, row_size: usize) {
for y in 0..self.height() as usize {
let dest_base: isize = (y * row_size).try_into().unwrap();
self.copy_row(y as u32, ptr.offset(dest_base));
}
}
}
impl LoadableImage for RgbaImage {
fn width(&self) -> u32 {
self.width()
}
fn height(&self) -> u32 {
self.height()
}
unsafe fn copy_row(&self, y: u32, ptr: *mut u8) {
let row_size_bytes = self.width() as usize * PIXEL_SIZE;
let raw: &Vec<u8> = self.as_raw();
let row = &raw[y as usize * row_size_bytes..(y as usize + 1) * row_size_bytes];
copy_nonoverlapping(row.as_ptr(), ptr, row.len());
}
}
/// An object that can be used to resolve a texture from a BSP File
pub trait TextureResolver {
type Image: LoadableImage;
/// Get the given texture, or None if it's corrupt/not there.
fn resolve(&mut self, texture_id: u32) -> Option<Self::Image>;
}
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