aleatico 0.1.1

stub package for furmint engine graphics
Documentation 
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use crate::define_store;
use crate::errors::AleaticoResult;
use crate::renderer::ctx::Gpu;
use image::GenericImageView;

define_store!(Texture);

/// Represents a texture
#[allow(unused)]
pub struct Texture {
    diffuse_bind_group: wgpu::BindGroup,
}

impl Texture {
    /// Create a new texture from an image data in bytes
    pub fn from_bytes(ctx: &mut Gpu, data: &[u8]) -> AleaticoResult<Self> {
        let diffuse_image = image::load_from_memory(data).unwrap();
        let diffuse_rgba = diffuse_image.to_rgba8();

        let dimensions = diffuse_image.dimensions();

        let texture_size = wgpu::Extent3d {
            width: dimensions.0,
            height: dimensions.1,
            depth_or_array_layers: 1,
        };
        let diffuse_texture = ctx.device.create_texture(&wgpu::TextureDescriptor {
            size: texture_size,
            mip_level_count: 1,
            sample_count: 1,
            dimension: wgpu::TextureDimension::D2,
            format: wgpu::TextureFormat::Rgba8UnormSrgb,
            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
            label: Some("diffuse_texture"),
            view_formats: &[],
        });

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

        let diffuse_texture_view =
            diffuse_texture.create_view(&wgpu::TextureViewDescriptor::default());
        let diffuse_sampler = ctx.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::MipmapFilterMode::Nearest,
            ..Default::default()
        });

        let texture_bind_group_layout =
            ctx.device
                .create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
                    entries: &[
                        wgpu::BindGroupLayoutEntry {
                            binding: 0,
                            visibility: wgpu::ShaderStages::FRAGMENT,
                            ty: wgpu::BindingType::Texture {
                                multisampled: false,
                                view_dimension: wgpu::TextureViewDimension::D2,
                                sample_type: wgpu::TextureSampleType::Float { filterable: true },
                            },
                            count: None,
                        },
                        wgpu::BindGroupLayoutEntry {
                            binding: 1,
                            visibility: wgpu::ShaderStages::FRAGMENT,
                            ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
                            count: None,
                        },
                    ],
                    label: Some("texture_bind_group_layout"),
                });

        let diffuse_bind_group = ctx.device.create_bind_group(&wgpu::BindGroupDescriptor {
            layout: &texture_bind_group_layout,
            entries: &[
                wgpu::BindGroupEntry {
                    binding: 0,
                    resource: wgpu::BindingResource::TextureView(&diffuse_texture_view),
                },
                wgpu::BindGroupEntry {
                    binding: 1,
                    resource: wgpu::BindingResource::Sampler(&diffuse_sampler),
                },
            ],
            label: Some("diffuse_bind_group"),
        });

        Ok(Self { diffuse_bind_group })
    }

    /// Get the bind group
    pub fn raw(&self) -> &wgpu::BindGroup {
        &self.diffuse_bind_group
    }
}