graphics 0.5.12

A 3D rendering engine for rust programs, with GUI integration
Documentation 
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use image::GenericImageView;
use wgpu::{Device, Queue, TextureDescriptor, TextureFormat};

use crate::system::DEPTH_FORMAT;

pub struct Texture {
    pub _texture: wgpu::Texture,
    pub view: wgpu::TextureView,
    pub _sampler: wgpu::Sampler,
}

impl Texture {
    /// Create a 2d texture for the depth stencil.
    pub fn create_depth_texture(
        device: &Device,
        config: &wgpu::SurfaceConfiguration,
        label: &str,
        sample_count: u32,
    ) -> Self {
        let size = wgpu::Extent3d {
            width: config.width,
            height: config.height,
            depth_or_array_layers: 1,
        };

        let desc = TextureDescriptor {
            label: Some(label),
            size,
            mip_level_count: 1,
            sample_count,
            dimension: wgpu::TextureDimension::D2,
            format: DEPTH_FORMAT,
            usage: wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::TEXTURE_BINDING,
            view_formats: &[],
        };

        let texture = device.create_texture(&desc);
        let view = texture.create_view(&wgpu::TextureViewDescriptor::default());
        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
            address_mode_u: wgpu::AddressMode::ClampToEdge,
            address_mode_v: wgpu::AddressMode::ClampToEdge,
            address_mode_w: wgpu::AddressMode::ClampToEdge,
            mag_filter: wgpu::FilterMode::Linear,
            min_filter: wgpu::FilterMode::Linear,
            mipmap_filter: wgpu::FilterMode::Nearest,
            compare: Some(wgpu::CompareFunction::LessEqual),
            lod_min_clamp: 0.0,
            lod_max_clamp: 100.0,
            ..Default::default()
        });

        Self {
            _texture: texture,
            view,
            _sampler: sampler,
        }
    }

    #[allow(dead_code)]
    pub fn from_bytes(
        device: &Device,
        queue: &Queue,
        bytes: &[u8],
        label: &str,
        is_normal_map: bool,
    ) -> Self {
        let img = image::load_from_memory(bytes).unwrap();
        Self::from_image(device, queue, &img, Some(label), is_normal_map)
    }

    #[allow(dead_code)]
    pub fn from_image(
        device: &Device,
        queue: &Queue,
        img: &image::DynamicImage,
        label: Option<&str>,
        is_normal_map: bool,
    ) -> Self {
        let dimensions = img.dimensions();
        let rgba = img.to_rgba8();

        let size = wgpu::Extent3d {
            width: dimensions.0,
            height: dimensions.1,
            depth_or_array_layers: 1,
        };
        let texture = device.create_texture(&TextureDescriptor {
            label,
            size,
            mip_level_count: 1,
            sample_count: 1,
            dimension: wgpu::TextureDimension::D2,
            format: if is_normal_map {
                TextureFormat::Rgba8Unorm
            } else {
                TextureFormat::Rgba8UnormSrgb
            },
            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
            view_formats: &[], // todo?
        });

        queue.write_texture(
            wgpu::TexelCopyTextureInfo {
                aspect: wgpu::TextureAspect::All,
                texture: &texture,
                mip_level: 0,
                origin: wgpu::Origin3d::ZERO,
            },
            &rgba,
            wgpu::TexelCopyBufferLayout {
                offset: 0,
                bytes_per_row: Some(4 * dimensions.0),
                rows_per_image: Some(dimensions.1),
            },
            size,
        );

        let view = texture.create_view(&wgpu::TextureViewDescriptor::default());
        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
            address_mode_u: wgpu::AddressMode::ClampToEdge,
            address_mode_v: wgpu::AddressMode::ClampToEdge,
            address_mode_w: wgpu::AddressMode::ClampToEdge,
            mag_filter: wgpu::FilterMode::Linear,
            min_filter: wgpu::FilterMode::Nearest,
            mipmap_filter: wgpu::FilterMode::Nearest,
            ..Default::default()
        });

        Self {
            _texture: texture,
            view,
            _sampler: sampler,
        }
    }
}