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use super::{SamplerDescriptor, TextureDescriptor, TextureFormat};
use crate::renderer::{
RenderResource, RenderResourceContext, RenderResourceId, RenderResourceType,
};
use bevy_app::prelude::{EventReader, Events};
use bevy_asset::{AssetEvent, Assets, Handle};
use bevy_ecs::{Res, ResMut};
use bevy_math::Vec2;
use bevy_utils::HashSet;
pub const TEXTURE_ASSET_INDEX: usize = 0;
pub const SAMPLER_ASSET_INDEX: usize = 1;
#[derive(Clone)]
pub struct Texture {
pub data: Vec<u8>,
pub size: Vec2,
pub format: TextureFormat,
}
impl Default for Texture {
fn default() -> Self {
Texture {
data: Default::default(),
size: Default::default(),
format: TextureFormat::Rgba8UnormSrgb,
}
}
}
impl Texture {
pub fn new(size: Vec2, data: Vec<u8>, format: TextureFormat) -> Self {
debug_assert_eq!(
size.x() as usize * size.y() as usize * format.pixel_size(),
data.len(),
"Pixel data, size and format have to match",
);
Self { data, size, format }
}
pub fn new_fill(size: Vec2, pixel: &[u8], format: TextureFormat) -> Self {
let mut value = Self::default();
value.format = format;
value.resize(size);
debug_assert_eq!(
pixel.len() % format.pixel_size(),
0,
"Must not have incomplete pixel data"
);
debug_assert!(
pixel.len() <= value.data.len(),
"Fill data must fit within pixel buffer"
);
for current_pixel in value.data.chunks_exact_mut(pixel.len()) {
current_pixel.copy_from_slice(&pixel);
}
value
}
pub fn aspect(&self) -> f32 {
self.size.y() / self.size.x()
}
pub fn resize(&mut self, size: Vec2) {
self.size = size;
let width = size.x() as usize;
let height = size.y() as usize;
self.data
.resize(width * height * self.format.pixel_size(), 0);
}
pub fn texture_resource_system(
mut state: ResMut<TextureResourceSystemState>,
render_resource_context: Res<Box<dyn RenderResourceContext>>,
textures: Res<Assets<Texture>>,
texture_events: Res<Events<AssetEvent<Texture>>>,
) {
let render_resource_context = &**render_resource_context;
let mut changed_textures = HashSet::default();
for event in state.event_reader.iter(&texture_events) {
match event {
AssetEvent::Created { handle } => {
changed_textures.insert(*handle);
}
AssetEvent::Modified { handle } => {
changed_textures.insert(*handle);
Self::remove_current_texture_resources(render_resource_context, *handle);
}
AssetEvent::Removed { handle } => {
Self::remove_current_texture_resources(render_resource_context, *handle);
changed_textures.remove(handle);
}
}
}
for texture_handle in changed_textures.iter() {
if let Some(texture) = textures.get(texture_handle) {
let texture_descriptor: TextureDescriptor = texture.into();
let texture_resource = render_resource_context.create_texture(texture_descriptor);
let sampler_descriptor: SamplerDescriptor = texture.into();
let sampler_resource = render_resource_context.create_sampler(&sampler_descriptor);
render_resource_context.set_asset_resource(
*texture_handle,
RenderResourceId::Texture(texture_resource),
TEXTURE_ASSET_INDEX,
);
render_resource_context.set_asset_resource(
*texture_handle,
RenderResourceId::Sampler(sampler_resource),
SAMPLER_ASSET_INDEX,
);
}
}
}
fn remove_current_texture_resources(
render_resource_context: &dyn RenderResourceContext,
handle: Handle<Texture>,
) {
if let Some(RenderResourceId::Texture(resource)) =
render_resource_context.get_asset_resource(handle, TEXTURE_ASSET_INDEX)
{
render_resource_context.remove_texture(resource);
render_resource_context.remove_asset_resource(handle, TEXTURE_ASSET_INDEX);
}
if let Some(RenderResourceId::Sampler(resource)) =
render_resource_context.get_asset_resource(handle, SAMPLER_ASSET_INDEX)
{
render_resource_context.remove_sampler(resource);
render_resource_context.remove_asset_resource(handle, SAMPLER_ASSET_INDEX);
}
}
}
#[derive(Default)]
pub struct TextureResourceSystemState {
event_reader: EventReader<AssetEvent<Texture>>,
}
impl RenderResource for Option<Handle<Texture>> {
fn resource_type(&self) -> Option<RenderResourceType> {
self.map(|_texture| RenderResourceType::Texture)
}
fn write_buffer_bytes(&self, _buffer: &mut [u8]) {}
fn buffer_byte_len(&self) -> Option<usize> {
None
}
fn texture(&self) -> Option<Handle<Texture>> {
*self
}
}
impl RenderResource for Handle<Texture> {
fn resource_type(&self) -> Option<RenderResourceType> {
Some(RenderResourceType::Texture)
}
fn write_buffer_bytes(&self, _buffer: &mut [u8]) {}
fn buffer_byte_len(&self) -> Option<usize> {
None
}
fn texture(&self) -> Option<Handle<Texture>> {
Some(*self)
}
}