Rip base files from another project

Cargo.toml

@@ -6,3 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+bytemuck = "1.15.0"
+log = "0.4.21"
+wgpu     = "0.19.4"
+winit    = "0.29.15"

src/bind_group.rs

@@ -0,0 +1,137 @@
+use std::num::NonZeroU32;
+
+use anyhow::{Context as _, Result};
+
+use super::Context;
+
+#[derive(Debug, Default)]
+pub struct BindGroupLayoutBuilder<'a> {
+    next_binding: u32,
+    entries: Vec<wgpu::BindGroupLayoutEntry>,
+    label: Option<&'a str>,
+}
+
+impl<'a> BindGroupLayoutBuilder<'a> {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    #[inline]
+    pub fn with_label(mut self, label: &'a str) -> Self {
+        self.label = Some(label);
+        self
+    }
+
+    #[inline]
+    pub fn with_entry(
+        mut self,
+        visibility: wgpu::ShaderStages,
+        ty: wgpu::BindingType,
+        count: Option<NonZeroU32>,
+    ) -> Self {
+        self.entries.push(wgpu::BindGroupLayoutEntry {
+            binding: self.next_binding,
+            visibility,
+            ty,
+            count,
+        });
+        self.next_binding += 1;
+        self
+    }
+
+    #[inline]
+    pub fn with_uniform_entry(self, visibility: wgpu::ShaderStages) -> Self {
+        self.with_entry(
+            visibility,
+            wgpu::BindingType::Buffer {
+                ty: wgpu::BufferBindingType::Uniform,
+                has_dynamic_offset: false,
+                min_binding_size: None,
+            },
+            None,
+        )
+    }
+
+    #[inline]
+    pub fn with_rw_storage_entry(self, visibility: wgpu::ShaderStages) -> Self {
+        self.with_entry(
+            visibility,
+            wgpu::BindingType::Buffer {
+                ty: wgpu::BufferBindingType::Storage { read_only: false },
+                has_dynamic_offset: false,
+                min_binding_size: None,
+            },
+            None,
+        )
+    }
+
+    #[inline]
+    pub fn with_ro_storage_entry(self, visibility: wgpu::ShaderStages) -> Self {
+        self.with_entry(
+            visibility,
+            wgpu::BindingType::Buffer {
+                ty: wgpu::BufferBindingType::Storage { read_only: true },
+                has_dynamic_offset: false,
+                min_binding_size: None,
+            },
+            None,
+        )
+    }
+
+    #[inline]
+    pub fn build(self, context: &Context) -> wgpu::BindGroupLayout {
+        context
+            .device
+            .create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                label: self.label,
+                entries: &self.entries,
+            })
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct BindGroupBuilder<'a> {
+    next_binding: u32,
+    label: Option<&'a str>,
+    entries: Vec<wgpu::BindGroupEntry<'a>>,
+    layout: Option<&'a wgpu::BindGroupLayout>,
+}
+
+impl<'a> BindGroupBuilder<'a> {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    #[inline]
+    pub fn with_label(mut self, label: &'a str) -> Self {
+        self.label = Some(label);
+        self
+    }
+
+    #[inline]
+    pub fn with_entry(mut self, resource: wgpu::BindingResource<'a>) -> Self {
+        self.entries.push(wgpu::BindGroupEntry {
+            binding: self.next_binding,
+            resource,
+        });
+        self.next_binding += 1;
+        self
+    }
+
+    #[inline]
+    pub fn with_layout(mut self, layout: &'a wgpu::BindGroupLayout) -> Self {
+        self.layout = Some(layout);
+        self
+    }
+
+    #[inline]
+    pub fn build(self, context: &Context) -> Result<wgpu::BindGroup> {
+        Ok(context
+            .device
+            .create_bind_group(&wgpu::BindGroupDescriptor {
+                label: self.label,
+                layout: self.layout.context("BindGroupBuilder has no layout.")?,
+                entries: self.entries.as_slice(),
+            }))
+    }
+}

src/buffer.rs

@@ -0,0 +1,99 @@
+use std::ops::RangeBounds;
+
+use bytemuck::NoUninit;
+use wgpu::util::DeviceExt;
+
+use super::Context;
+
+#[derive(Debug)]
+pub struct BulkBufferBuilder<'a> {
+    order: Vec<(bool, usize)>,
+    init_descriptors: Vec<wgpu::util::BufferInitDescriptor<'a>>,
+    descriptors: Vec<wgpu::BufferDescriptor<'a>>,
+    current_usage: wgpu::BufferUsages,
+}
+
+impl<'a> BulkBufferBuilder<'a> {
+    pub fn new() -> Self {
+        Self {
+            order: vec![],
+            init_descriptors: vec![],
+            descriptors: vec![],
+            current_usage: wgpu::BufferUsages::UNIFORM,
+        }
+    }
+
+    pub fn set_usage(mut self, usage: wgpu::BufferUsages) -> Self {
+        self.current_usage = usage;
+        self
+    }
+
+    pub fn with_buffer(mut self, label: &'a str, size: u64, mapped: bool) -> Self {
+        let descriptor = wgpu::BufferDescriptor {
+            label: Some(label),
+            size,
+            usage: self.current_usage,
+            mapped_at_creation: mapped,
+        };
+
+        self.order.push((false, self.descriptors.len()));
+        self.descriptors.push(descriptor);
+        self
+    }
+
+    pub fn with_init_buffer(mut self, label: &'a str, contents: &'a [u8]) -> Self {
+        let descriptor = wgpu::util::BufferInitDescriptor {
+            label: Some(label),
+            contents,
+            usage: self.current_usage,
+        };
+
+        self.order.push((true, self.init_descriptors.len()));
+        self.init_descriptors.push(descriptor);
+        self
+    }
+
+    pub fn with_init_buffer_bm<A: NoUninit>(self, label: &'a str, contents: &'a [A]) -> Self {
+        self.with_init_buffer(label, bytemuck::cast_slice(contents))
+    }
+
+    pub fn build(self, context: &Context) -> Vec<wgpu::Buffer> {
+        let device = &context.device;
+        let mut buffers = vec![];
+        for (init, index) in self.order {
+            let buffer = if init {
+                device.create_buffer_init(&(self.init_descriptors[index]))
+            } else {
+                device.create_buffer(&(self.descriptors[index]))
+            };
+
+            buffers.push(buffer);
+        }
+
+        buffers
+    }
+}
+
+pub trait BufferExt {
+    fn get_mapped_range<S: RangeBounds<wgpu::BufferAddress>, T: bytemuck::Pod>(
+        &self,
+        context: &Context,
+        bounds: S,
+    ) -> Vec<T>;
+}
+
+impl BufferExt for wgpu::Buffer {
+    fn get_mapped_range<S: RangeBounds<wgpu::BufferAddress>, T: bytemuck::Pod>(
+        &self,
+        context: &Context,
+        bounds: S,
+    ) -> Vec<T> {
+        let slice = self.slice(bounds);
+        slice.map_async(wgpu::MapMode::Read, |_| {});
+        context.device.poll(wgpu::Maintain::Wait);
+        let data: Vec<T> = bytemuck::cast_slice(slice.get_mapped_range().as_ref()).to_vec();
+        self.unmap();
+
+        data
+    }
+}

src/context.rs

@@ -0,0 +1,108 @@
+use std::sync::Arc;
+
+use anyhow::{Context as _, Result};
+use winit::{
+    dpi::PhysicalSize, event::WindowEvent, event_loop::EventLoopWindowTarget, window::Window,
+};
+
+pub struct Context<'window> {
+    pub window: Arc<Window>,
+    pub instance: wgpu::Instance,
+    pub size: PhysicalSize<u32>,
+    pub surface: wgpu::Surface<'window>,
+    pub surface_config: wgpu::SurfaceConfiguration,
+    pub adapter: wgpu::Adapter,
+    pub device: wgpu::Device,
+    pub queue: wgpu::Queue,
+}
+
+impl<'window> Context<'window> {
+    pub async fn new(window: Arc<Window>, limits: wgpu::Limits) -> Result<Self> {
+        log::info!("Initialising WGPU context...");
+        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+            backends: wgpu::Backends::VULKAN,
+            dx12_shader_compiler: Default::default(),
+            ..Default::default()
+        });
+
+        // To be able to start drawing we need a few things:
+        // - A surface
+        // - A GPU device to draw to the surface
+        // - A draw command queue
+        log::info!("Initialising window surface...");
+        let surface = instance.create_surface(window.clone())?;
+
+        log::info!("Requesting GPU adapter...");
+        let adapter = instance
+            .request_adapter(&wgpu::RequestAdapterOptions {
+                power_preference: wgpu::PowerPreference::HighPerformance,
+                force_fallback_adapter: false,
+                compatible_surface: Some(&surface),
+            })
+            .await
+            .context("Failed to find suitable GPU adapter")?;
+
+        log::info!("Checking GPU adapter meets requirements");
+        log::info!("Requesting GPU device...");
+        let (device, queue) = adapter
+            .request_device(
+                &wgpu::DeviceDescriptor {
+                    label: None,
+                    required_features: wgpu::Features::empty(),
+                    required_limits: limits,
+                },
+                None,
+            )
+            .await?;
+
+        log::info!("Configuring window surface...");
+        let size = window.inner_size();
+        let surface_config = surface
+            .get_default_config(&adapter, size.width, size.height)
+            .context("Surface configuration unsupported by adapter")?;
+        surface.configure(&device, &surface_config);
+
+        Ok(Self {
+            window,
+            instance,
+            size,
+            surface,
+            surface_config,
+            adapter,
+            device,
+            queue,
+        })
+    }
+
+    pub fn resize_surface(&mut self, new_size: PhysicalSize<u32>) {
+        if new_size.width > 0 && new_size.height > 0 {
+            self.size = new_size;
+            self.surface_config.width = new_size.width;
+            self.surface_config.height = new_size.height;
+            self.surface.configure(&self.device, &self.surface_config);
+        }
+    }
+
+    pub fn handle_window_event(
+        &mut self,
+        event: &WindowEvent,
+        elwt: &EventLoopWindowTarget<()>,
+    ) -> bool {
+        let mut handled = true;
+        match event {
+            WindowEvent::CloseRequested => {
+                elwt.exit();
+            }
+            WindowEvent::Resized(physical_size) => {
+                self.resize_surface(*physical_size);
+            }
+            WindowEvent::ScaleFactorChanged { .. } => {
+                self.resize_surface(self.window.inner_size());
+            }
+
+            _ => handled = false,
+        }
+
+        handled
+    }
+}

src/lib.rs

@@ -1,14 +1,11 @@
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
+mod bind_group;
+mod buffer;
+mod context;
+mod texture;
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+pub use self::{
+    bind_group::{BindGroupBuilder, BindGroupLayoutBuilder},
+    buffer::{BufferExt, BulkBufferBuilder},
+    context::Context,
+    texture::{Texture, TextureBuilder},
+};

src/texture.rs

@@ -0,0 +1,199 @@
+use anyhow::Result;
+
+use super::{BindGroupBuilder, BindGroupLayoutBuilder, Context};
+
+// TODO: Support mip-mapping and multi-sampling
+#[derive(Debug, Clone)]
+pub struct TextureAttributes {
+    pub size: wgpu::Extent3d,
+    pub dimension: wgpu::TextureDimension,
+    pub format: wgpu::TextureFormat,
+    pub usage: wgpu::TextureUsages,
+    pub address_mode_u: wgpu::AddressMode,
+    pub address_mode_v: wgpu::AddressMode,
+    pub address_mode_w: wgpu::AddressMode,
+    pub mag_filter: wgpu::FilterMode,
+    pub min_filter: wgpu::FilterMode,
+    pub mipmap_filter: wgpu::FilterMode,
+    pub shader_visibility: wgpu::ShaderStages,
+}
+
+impl Default for TextureAttributes {
+    fn default() -> Self {
+        Self {
+            size: Default::default(),
+            dimension: wgpu::TextureDimension::D2,
+            format: wgpu::TextureFormat::Rgba8UnormSrgb,
+            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
+            address_mode_u: wgpu::AddressMode::default(),
+            address_mode_v: wgpu::AddressMode::default(),
+            address_mode_w: wgpu::AddressMode::default(),
+            mag_filter: wgpu::FilterMode::default(),
+            min_filter: wgpu::FilterMode::default(),
+            mipmap_filter: wgpu::FilterMode::default(),
+            shader_visibility: wgpu::ShaderStages::FRAGMENT,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct TextureBuilder {
+    pub attributes: TextureAttributes,
+}
+
+impl TextureBuilder {
+    pub fn new() -> Self {
+        Self {
+            attributes: Default::default(),
+        }
+    }
+
+    #[inline]
+    pub fn with_size(mut self, width: u32, height: u32, depth: u32) -> Self {
+        self.attributes.size = wgpu::Extent3d {
+            width,
+            height,
+            depth_or_array_layers: depth,
+        };
+        self
+    }
+
+    #[inline]
+    pub fn with_dimension(mut self, dimension: wgpu::TextureDimension) -> Self {
+        self.attributes.dimension = dimension;
+        self
+    }
+
+    #[inline]
+    pub fn with_format(mut self, format: wgpu::TextureFormat) -> Self {
+        self.attributes.format = format;
+        self
+    }
+
+    #[inline]
+    pub fn with_usage(mut self, usage: wgpu::TextureUsages) -> Self {
+        self.attributes.usage = usage;
+        self
+    }
+
+    #[inline]
+    pub fn with_address_mode(mut self, address_mode: wgpu::AddressMode) -> Self {
+        self.attributes.address_mode_u = address_mode;
+        self.attributes.address_mode_v = address_mode;
+        self.attributes.address_mode_w = address_mode;
+        self
+    }
+
+    #[inline]
+    pub fn with_filter_mode(mut self, filter_mode: wgpu::FilterMode) -> Self {
+        self.attributes.mag_filter = filter_mode;
+        self.attributes.min_filter = filter_mode;
+        self.attributes.mipmap_filter = filter_mode;
+        self
+    }
+
+    #[inline]
+    pub fn with_shader_visibility(mut self, visibility: wgpu::ShaderStages) -> Self {
+        self.attributes.shader_visibility = visibility;
+        self
+    }
+
+    #[inline]
+    pub fn build(self, context: &Context) -> Result<Texture> {
+        Texture::new(context, self.attributes)
+    }
+}
+
+#[derive(Debug)]
+pub struct Texture {
+    pub attributes: TextureAttributes,
+    pub texture: wgpu::Texture,
+    pub view: wgpu::TextureView,
+    pub sampler: wgpu::Sampler,
+    pub bind_group_layout: wgpu::BindGroupLayout,
+    pub bind_group: wgpu::BindGroup,
+}
+
+impl Texture {
+    pub fn new(context: &Context, attributes: TextureAttributes) -> Result<Self> {
+        let texture = context.device.create_texture(&wgpu::TextureDescriptor {
+            label: None,
+            size: attributes.size,
+            mip_level_count: 1,
+            sample_count: 1,
+            dimension: attributes.dimension,
+            format: attributes.format,
+            usage: attributes.usage,
+            view_formats: &[],
+        });
+
+        let view = texture.create_view(&wgpu::TextureViewDescriptor::default());
+        let sampler = context.device.create_sampler(&wgpu::SamplerDescriptor {
+            address_mode_u: attributes.address_mode_u,
+            address_mode_v: attributes.address_mode_v,
+            address_mode_w: attributes.address_mode_w,
+            mag_filter: attributes.mag_filter,
+            min_filter: attributes.min_filter,
+            mipmap_filter: attributes.mipmap_filter,
+            ..Default::default()
+        });
+
+        let view_dimension = match attributes.dimension {
+            wgpu::TextureDimension::D1 => wgpu::TextureViewDimension::D1,
+            wgpu::TextureDimension::D2 => wgpu::TextureViewDimension::D2,
+            wgpu::TextureDimension::D3 => wgpu::TextureViewDimension::D3,
+        };
+
+        let bind_group_layout = BindGroupLayoutBuilder::new()
+            .with_entry(
+                attributes.shader_visibility,
+                wgpu::BindingType::Texture {
+                    sample_type: wgpu::TextureSampleType::Float { filterable: true },
+                    view_dimension,
+                    multisampled: false,
+                },
+                None,
+            )
+            .with_entry(
+                attributes.shader_visibility,
+                wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
+                None,
+            )
+            .build(context);
+        let bind_group = BindGroupBuilder::new()
+            .with_layout(&bind_group_layout)
+            .with_entry(wgpu::BindingResource::TextureView(&view))
+            .with_entry(wgpu::BindingResource::Sampler(&sampler))
+            .build(context)?;
+
+        Ok(Self {
+            attributes,
+            texture,
+            view,
+            sampler,
+            bind_group_layout,
+            bind_group,
+        })
+    }
+
+    pub fn update(&self, context: &Context, data: &[u8]) {
+        log::info!("Updating texture contents...");
+        let copy_texture = wgpu::ImageCopyTexture {
+            texture: &self.texture,
+            mip_level: 0,
+            origin: wgpu::Origin3d::ZERO,
+            aspect: wgpu::TextureAspect::All,
+        };
+
+        let size = self.attributes.size;
+        let image_layout = wgpu::ImageDataLayout {
+            offset: 0,
+            bytes_per_row: Some(4 * size.width),
+            rows_per_image: Some(size.height),
+        };
+
+        context
+            .queue
+            .write_texture(copy_texture, data, image_layout, size);
+    }
+}