khora_lanes/asset_lane/loading/
texture_loader_lane.rs

1// Copyright 2025 eraflo
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15//! Texture loading and management.
16
17use super::AssetLoaderLane;
18use anyhow::{Context, Result};
19use khora_core::{
20    math::Extent3D,
21    renderer::api::{
22        resource::{CpuTexture, TextureDimension, TextureUsage},
23        util::{SampleCount, TextureFormat},
24    },
25};
26
27/// A lane dedicated to loading and decoding texture files on the CPU
28#[derive(Clone)]
29pub struct TextureLoaderLane;
30
31impl AssetLoaderLane<CpuTexture> for TextureLoaderLane {
32    fn load(
33        &self,
34        bytes: &[u8],
35    ) -> Result<CpuTexture, Box<dyn std::error::Error + Send + Sync + 'static>> {
36        // Decode the image using the `image` crate
37        let img = image::load_from_memory(bytes).context("Failed to decode image from memory")?;
38
39        // Convert to RGBA8 (keep in sRGB space)
40        let rgba_img = img.to_rgba8();
41        let (width, height) = rgba_img.dimensions();
42
43        Ok(CpuTexture {
44            pixels: rgba_img.into_raw(),
45            size: Extent3D {
46                width,
47                height,
48                depth_or_array_layers: 1,
49            },
50            format: TextureFormat::Rgba8UnormSrgb,
51            mip_level_count: 1,
52            sample_count: SampleCount::X1,
53            dimension: TextureDimension::D2,
54            usage: TextureUsage::COPY_DST | TextureUsage::TEXTURE_BINDING,
55        })
56    }
57}
58
59impl khora_core::lane::Lane for TextureLoaderLane {
60    fn strategy_name(&self) -> &'static str {
61        "TextureLoader"
62    }
63
64    fn lane_kind(&self) -> khora_core::lane::LaneKind {
65        khora_core::lane::LaneKind::Asset
66    }
67
68    fn as_any(&self) -> &dyn std::any::Any {
69        self
70    }
71
72    fn as_any_mut(&mut self) -> &mut dyn std::any::Any {
73        self
74    }
75}
khora_lanes/asset_lane/loading/texture_loader_lane.rs

khora_lanes/asset_lane/loading/
texture_loader_lane.rs
