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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e8c0e78
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "glyphon"
+description = "Fast, simple 2D text rendering for wgpu"
+version = "0.1.0"
+edition = "2021"
+homepage = "https://github.com/grovesNL/glyphon.git"
+repository = "https://github.com/grovesNL/glyphon"
+license = "MIT OR Apache-2.0 OR Zlib"
+
+[dependencies]
+wgpu = { git = "https://github.com/gfx-rs/wgpu/" }
+fontdue = "0.7.2"
+etagere = "0.2.6"
+pollster = "0.2.5"
+
+[dev-dependencies]
+winit = "0.26.1"
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
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+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
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+
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
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diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..31aa793
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,23 @@
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/LICENSE-ZLIB b/LICENSE-ZLIB
new file mode 100644
index 0000000..480c61e
--- /dev/null
+++ b/LICENSE-ZLIB
@@ -0,0 +1,15 @@
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
diff --git a/README.md b/README.md
index 9ec5688..3ad9827 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,32 @@
-# glyphon
-🦅🦁 Fast, simple 2D text rendering for wgpu
+
+ 🦅🦁 glyphon
+
+
+ Fast, simple 2D text rendering for wgpu
+
+
+
+
+## What is this?
+
+This crate provides a simple way to render 2D text with [`wgpu`](https://github.com/gfx-rs/wgpu/) by:
+
+- rasterizing glyphs (with [`fontdue`](https://github.com/mooman219/fontdue/))
+- packing the glyphs into texture atlas (with [`etagere`](https://github.com/nical/etagere/))
+- calculate layout for text (with [`fontdue`](https://github.com/mooman219/fontdue/))
+- sampling from the texture atlas to render text (with [`wgpu`](https://github.com/gfx-rs/wgpu/))
+
+To avoid extra render passes, rendering uses existing render passes(following the middleware pattern described in [`wgpu`'s Encapsulating Graphics Work wiki page](https://github.com/gfx-rs/wgpu/wiki/Encapsulating-Graphics-Work).
+
+## License
+
+This project is licensed under either [Apache License, Version 2.0](LICENSE-APACHE), [zlib License](LICENSE-ZLIB), or [MIT License](LICENSE-MIT), at your option.
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this project by you, as defined in the Apache 2.0 license, shall be triple licensed as above, without any additional terms or conditions.
diff --git a/examples/Inter-Bold.ttf b/examples/Inter-Bold.ttf
new file mode 100644
index 0000000..76a215c
Binary files /dev/null and b/examples/Inter-Bold.ttf differ
diff --git a/examples/hello-world.rs b/examples/hello-world.rs
new file mode 100644
index 0000000..00ca933
--- /dev/null
+++ b/examples/hello-world.rs
@@ -0,0 +1,140 @@
+use fontdue::{
+ layout::{CoordinateSystem, Layout, LayoutSettings, TextStyle},
+ Font, FontSettings,
+};
+use wgpu::{
+ Color, CommandEncoderDescriptor, LoadOp, Operations, RenderPassColorAttachment,
+ RenderPassDescriptor, TextureViewDescriptor,
+};
+use glyphon::{Resolution, TextRenderer};
+use winit::{
+ event::{Event, WindowEvent},
+ event_loop::{ControlFlow, EventLoop},
+ window::Window,
+};
+
+fn main() {
+ pollster::block_on(run());
+}
+
+async fn run() {
+ let instance = wgpu::Instance::new(wgpu::Backends::all());
+ let adapter = instance
+ .request_adapter(&wgpu::RequestAdapterOptions::default())
+ .await
+ .unwrap();
+ let (device, queue) = adapter
+ .request_device(
+ &wgpu::DeviceDescriptor {
+ label: None,
+ features: wgpu::Features::empty(),
+ limits: wgpu::Limits::downlevel_defaults(),
+ },
+ None,
+ )
+ .await
+ .unwrap();
+
+ let event_loop = EventLoop::new();
+ let window = Window::new(&event_loop).unwrap();
+ let surface = unsafe { instance.create_surface(&window) };
+ let size = window.inner_size();
+ let swapchain_format = surface.get_preferred_format(&adapter).unwrap();
+ let mut config = wgpu::SurfaceConfiguration {
+ usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+ format: swapchain_format,
+ width: size.width,
+ height: size.height,
+ present_mode: wgpu::PresentMode::Mailbox,
+ };
+ surface.configure(&device, &config);
+
+ let mut text_renderer = TextRenderer::new(
+ &device,
+ &queue,
+ swapchain_format,
+ Resolution {
+ width: size.width,
+ height: size.height,
+ },
+ );
+
+ let font = include_bytes!("./Inter-Bold.ttf") as &[u8];
+ let font = Font::from_bytes(font, FontSettings::default()).unwrap();
+ let fonts = vec![font];
+ let mut layout = Layout::new(CoordinateSystem::PositiveYDown);
+
+ event_loop.run(move |event, _, control_flow| {
+ let _ = (&instance, &adapter);
+
+ *control_flow = ControlFlow::Poll;
+ match event {
+ Event::WindowEvent {
+ event: WindowEvent::Resized(size),
+ ..
+ } => {
+ config.width = size.width;
+ config.height = size.height;
+ surface.configure(&device, &config);
+ window.request_redraw();
+ }
+ Event::RedrawRequested(_) => {
+ layout.reset(&LayoutSettings {
+ x: 0.0,
+ y: 0.0,
+ ..LayoutSettings::default()
+ });
+
+ layout.append(
+ fonts.as_slice(),
+ &TextStyle::new("Hello world!\nI'm on a new line!", 50.0, 0),
+ );
+
+ text_renderer
+ .prepare(
+ &device,
+ &queue,
+ Resolution {
+ width: config.width,
+ height: config.height,
+ },
+ &fonts,
+ &[&layout],
+ )
+ .unwrap();
+
+ let frame = surface.get_current_texture().unwrap();
+ let view = frame.texture.create_view(&TextureViewDescriptor::default());
+ let mut encoder =
+ device.create_command_encoder(&CommandEncoderDescriptor { label: None });
+ {
+ let mut pass = encoder.begin_render_pass(&RenderPassDescriptor {
+ label: None,
+ color_attachments: &[RenderPassColorAttachment {
+ view: &view,
+ resolve_target: None,
+ ops: Operations {
+ load: LoadOp::Clear(Color::BLACK),
+ store: true,
+ },
+ }],
+ depth_stencil_attachment: None,
+ });
+
+ text_renderer.render(&mut pass).unwrap();
+ }
+
+ queue.submit(Some(encoder.finish()));
+ frame.present();
+ }
+ Event::WindowEvent {
+ event: WindowEvent::CloseRequested,
+ ..
+ } => *control_flow = ControlFlow::Exit,
+ Event::MainEventsCleared => {
+ window.request_redraw();
+ }
+ _ => {}
+ }
+ });
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ad6fce0
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,566 @@
+use std::{
+ borrow::Cow,
+ collections::{HashMap, HashSet},
+ error::Error,
+ fmt::{self, Display, Formatter},
+ iter, mem,
+ num::{NonZeroU32, NonZeroU64},
+ slice,
+};
+
+use etagere::{size2, AllocId, Allocation, BucketedAtlasAllocator};
+use fontdue::{
+ layout::{GlyphRasterConfig, Layout},
+ Font,
+};
+use wgpu::{
+ util::{BufferInitDescriptor, DeviceExt},
+ BindGroup, BindGroupEntry, BindGroupLayoutEntry, BindingResource, BindingType, BlendState,
+ Buffer, BufferBindingType, BufferDescriptor, BufferUsages, ColorTargetState, ColorWrites,
+ Device, Extent3d, FilterMode, FragmentState, ImageCopyTexture, ImageDataLayout, IndexFormat,
+ MultisampleState, Origin3d, PipelineLayoutDescriptor, PrimitiveState, Queue, RenderPass,
+ RenderPipeline, RenderPipelineDescriptor, SamplerBindingType, SamplerDescriptor,
+ ShaderModuleDescriptor, ShaderSource, ShaderStages, Texture, TextureAspect, TextureDescriptor,
+ TextureDimension, TextureFormat, TextureSampleType, TextureUsages, TextureViewDescriptor,
+ TextureViewDimension, VertexFormat, VertexState,
+};
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum PrepareError {
+ AtlasFull,
+}
+
+impl Display for PrepareError {
+ fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+ write!(f, "prepare error")
+ }
+}
+
+impl Error for PrepareError {}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum RenderError {}
+
+impl Display for RenderError {
+ fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+ write!(f, "render error")
+ }
+}
+
+enum GpuCache {
+ InAtlas { x: u16, y: u16 },
+ SkipRasterization,
+}
+
+struct GlyphDetails {
+ width: u32,
+ height: u32,
+ gpu_cache: GpuCache,
+ atlas_id: Option,
+}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug)]
+struct GlyphToRender {
+ x: f32,
+ y: f32,
+ width: f32,
+ height: f32,
+ atlas_x: f32,
+ atlas_y: f32,
+ color: [u8; 4],
+}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct Resolution {
+ pub width: u32,
+ pub height: u32,
+}
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct Params {
+ screen_resolution: Resolution,
+}
+
+fn try_allocate(
+ atlas_packer: &mut BucketedAtlasAllocator,
+ layout: &Layout,
+ glyph_cache: &mut HashMap,
+ width: usize,
+ height: usize,
+) -> Option {
+ let size = size2(width as i32, height as i32);
+ let allocation = atlas_packer.allocate(size);
+
+ if allocation.is_some() {
+ return allocation;
+ }
+
+ // Try to free any allocations not used in the current layout
+ let used_glyphs = layout
+ .glyphs()
+ .iter()
+ .map(|gp| gp.key)
+ .collect::>();
+
+ glyph_cache.retain(|key, details| {
+ if used_glyphs.contains(&key) {
+ true
+ } else {
+ if let Some(atlas_id) = details.atlas_id {
+ atlas_packer.deallocate(atlas_id)
+ }
+ false
+ }
+ });
+
+ // Attempt to reallocate
+ atlas_packer.allocate(size)
+}
+
+pub struct TextRenderer {
+ glyph_cache: HashMap,
+ atlas_texture_pending: Vec,
+ atlas_texture: Texture,
+ atlas_packer: BucketedAtlasAllocator,
+ atlas_width: u32,
+ atlas_height: u32,
+ pipeline: RenderPipeline,
+ vertex_buffer: Buffer,
+ vertex_buffer_size: u64,
+ index_buffer: Buffer,
+ index_buffer_size: u64,
+ params: Params,
+ params_buffer: Buffer,
+ bind_group: BindGroup,
+ vertices_to_render: u32,
+}
+
+impl TextRenderer {
+ pub fn new(
+ device: &Device,
+ _queue: &Queue,
+ format: TextureFormat,
+ screen_resolution: Resolution,
+ ) -> Self {
+ let glyph_cache = HashMap::new();
+ let max_texture_dimension_2d = device.limits().max_texture_dimension_2d;
+ let atlas_width = max_texture_dimension_2d;
+ let atlas_height = max_texture_dimension_2d;
+
+ let atlas_packer =
+ BucketedAtlasAllocator::new(size2(atlas_width as i32, atlas_height as i32));
+
+ // Create a texture to use for our atlas
+ let atlas_texture_pending = vec![0; (atlas_width * atlas_height) as usize];
+ let atlas_texture = device.create_texture(&TextureDescriptor {
+ label: Some("glyphon atlas"),
+ size: Extent3d {
+ width: atlas_width,
+ height: atlas_height,
+ depth_or_array_layers: 1,
+ },
+ mip_level_count: 1,
+ sample_count: 1,
+ dimension: TextureDimension::D2,
+ format: TextureFormat::R8Unorm,
+ usage: TextureUsages::TEXTURE_BINDING | TextureUsages::COPY_DST,
+ });
+ let atlas_texture_view = atlas_texture.create_view(&TextureViewDescriptor::default());
+ let atlas_sampler = device.create_sampler(&SamplerDescriptor {
+ label: Some("glyphon sampler"),
+ min_filter: FilterMode::Nearest,
+ mag_filter: FilterMode::Nearest,
+ mipmap_filter: FilterMode::Nearest,
+ lod_min_clamp: 0f32,
+ lod_max_clamp: 0f32,
+ ..Default::default()
+ });
+
+ // Create a render pipeline to use for rendering later
+ let shader = device.create_shader_module(&ShaderModuleDescriptor {
+ label: Some("glyphon shader"),
+ source: ShaderSource::Wgsl(Cow::Borrowed(include_str!("shader.wgsl"))),
+ });
+
+ let vertex_buffers = [wgpu::VertexBufferLayout {
+ array_stride: mem::size_of::() as wgpu::BufferAddress,
+ step_mode: wgpu::VertexStepMode::Vertex,
+ attributes: &[
+ wgpu::VertexAttribute {
+ format: VertexFormat::Float32x4,
+ offset: 0,
+ shader_location: 0,
+ },
+ wgpu::VertexAttribute {
+ format: VertexFormat::Float32x2,
+ offset: mem::size_of::() as u64 * 4,
+ shader_location: 1,
+ },
+ wgpu::VertexAttribute {
+ format: VertexFormat::Uint32,
+ offset: mem::size_of::() as u64 * 6,
+ shader_location: 2,
+ },
+ ],
+ }];
+
+ let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+ entries: &[
+ BindGroupLayoutEntry {
+ binding: 0,
+ visibility: ShaderStages::VERTEX,
+ ty: BindingType::Buffer {
+ ty: BufferBindingType::Uniform,
+ has_dynamic_offset: false,
+ min_binding_size: NonZeroU64::new(mem::size_of::() as u64),
+ },
+ count: None,
+ },
+ BindGroupLayoutEntry {
+ binding: 1,
+ visibility: ShaderStages::VERTEX | ShaderStages::FRAGMENT,
+ ty: BindingType::Texture {
+ multisampled: false,
+ view_dimension: TextureViewDimension::D2,
+ sample_type: TextureSampleType::Float { filterable: true },
+ },
+ count: None,
+ },
+ BindGroupLayoutEntry {
+ binding: 2,
+ visibility: ShaderStages::FRAGMENT,
+ ty: BindingType::Sampler(SamplerBindingType::Filtering),
+ count: None,
+ },
+ ],
+ label: Some("glyphon bind group layout"),
+ });
+
+ let params = Params { screen_resolution };
+
+ let params_raw = unsafe {
+ slice::from_raw_parts(
+ ¶ms as *const Params as *const u8,
+ mem::size_of::(),
+ )
+ };
+
+ let params_buffer = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+ label: Some("glyphon params"),
+ contents: params_raw,
+ usage: BufferUsages::UNIFORM | BufferUsages::COPY_DST,
+ });
+
+ let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+ layout: &bind_group_layout,
+ entries: &[
+ BindGroupEntry {
+ binding: 0,
+ resource: params_buffer.as_entire_binding(),
+ },
+ BindGroupEntry {
+ binding: 1,
+ resource: BindingResource::TextureView(&atlas_texture_view),
+ },
+ BindGroupEntry {
+ binding: 2,
+ resource: BindingResource::Sampler(&atlas_sampler),
+ },
+ ],
+ label: Some("glyphon bind group"),
+ });
+
+ let pipeline_layout = device.create_pipeline_layout(&PipelineLayoutDescriptor {
+ label: None,
+ bind_group_layouts: &[&bind_group_layout],
+ push_constant_ranges: &[],
+ });
+
+ let pipeline = device.create_render_pipeline(&RenderPipelineDescriptor {
+ label: Some("glyphon pipeline"),
+ layout: Some(&pipeline_layout),
+ vertex: VertexState {
+ module: &shader,
+ entry_point: "vs_main",
+ buffers: &vertex_buffers,
+ },
+ fragment: Some(FragmentState {
+ module: &shader,
+ entry_point: "fs_main",
+ targets: &[ColorTargetState {
+ format,
+ blend: Some(BlendState::ALPHA_BLENDING),
+ write_mask: ColorWrites::default(),
+ }],
+ }),
+ primitive: PrimitiveState::default(),
+ depth_stencil: None,
+ multisample: MultisampleState {
+ count: 1,
+ mask: !0,
+ alpha_to_coverage_enabled: false,
+ },
+ multiview: None,
+ });
+
+ let vertex_buffer_size = 4096;
+ let vertex_buffer = device.create_buffer(&BufferDescriptor {
+ label: Some("glyphon vertices"),
+ size: vertex_buffer_size,
+ usage: BufferUsages::VERTEX | BufferUsages::COPY_DST,
+ mapped_at_creation: false,
+ });
+
+ let index_buffer_size = 4096;
+ let index_buffer = device.create_buffer(&BufferDescriptor {
+ label: Some("glyphon indices"),
+ size: index_buffer_size,
+ usage: BufferUsages::INDEX | BufferUsages::COPY_DST,
+ mapped_at_creation: false,
+ });
+
+ Self {
+ glyph_cache,
+ atlas_texture_pending,
+ atlas_texture,
+ atlas_packer,
+ atlas_width,
+ atlas_height,
+ pipeline,
+ vertex_buffer,
+ vertex_buffer_size,
+ index_buffer,
+ index_buffer_size,
+ params,
+ params_buffer,
+ bind_group,
+ vertices_to_render: 0,
+ }
+ }
+
+ pub fn prepare(
+ &mut self,
+ device: &Device,
+ queue: &Queue,
+ screen_resolution: Resolution,
+ fonts: &[Font],
+ layouts: &[&Layout],
+ ) -> Result<(), PrepareError> {
+ if screen_resolution != self.params.screen_resolution {
+ self.params.screen_resolution = screen_resolution;
+ queue.write_buffer(&self.params_buffer, 0, unsafe {
+ slice::from_raw_parts(
+ &self.params as *const Params as *const u8,
+ mem::size_of::(),
+ )
+ });
+ }
+
+ struct UploadBounds {
+ x_min: usize,
+ x_max: usize,
+ y_min: usize,
+ y_max: usize,
+ }
+ let mut upload_bounds = None::;
+
+ for layout in layouts.iter() {
+ for glyph in layout.glyphs() {
+ let already_on_gpu = self.glyph_cache.contains_key(&glyph.key);
+ if already_on_gpu {
+ continue;
+ }
+
+ let font = &fonts[glyph.font_index];
+ let (metrics, bitmap) = font.rasterize_config(glyph.key);
+
+ let (gpu_cache, atlas_id) = if glyph.char_data.rasterize() {
+ // Find a position in the packer
+ let allocation = match try_allocate(
+ &mut self.atlas_packer,
+ layout,
+ &mut self.glyph_cache,
+ metrics.width,
+ metrics.height,
+ ) {
+ Some(a) => a,
+ None => return Err(PrepareError::AtlasFull),
+ };
+ let atlas_min = allocation.rectangle.min;
+ let atlas_max = allocation.rectangle.max;
+
+ for row in 0..metrics.height {
+ let y_offset = atlas_min.y as usize;
+ let x_offset =
+ (y_offset + row) * self.atlas_width as usize + atlas_min.x as usize;
+ let bitmap_row = &bitmap[row * metrics.width..(row + 1) * metrics.width];
+ self.atlas_texture_pending[x_offset..x_offset + metrics.width]
+ .copy_from_slice(bitmap_row);
+ }
+
+ match upload_bounds.as_mut() {
+ Some(ub) => {
+ ub.x_min = ub.x_min.min(atlas_min.x as usize);
+ ub.x_max = ub.x_max.max(atlas_max.x as usize);
+ ub.y_min = ub.y_min.min(atlas_min.y as usize);
+ ub.y_max = ub.y_max.max(atlas_max.y as usize);
+ }
+ None => {
+ upload_bounds = Some(UploadBounds {
+ x_min: atlas_min.x as usize,
+ x_max: atlas_max.x as usize,
+ y_min: atlas_min.y as usize,
+ y_max: atlas_max.y as usize,
+ });
+ }
+ }
+
+ (
+ GpuCache::InAtlas {
+ x: atlas_min.x as u16,
+ y: atlas_min.y as u16,
+ },
+ Some(allocation.id),
+ )
+ } else {
+ (GpuCache::SkipRasterization, None)
+ };
+
+ self.glyph_cache.insert(
+ glyph.key,
+ GlyphDetails {
+ width: metrics.width as u32,
+ height: metrics.height as u32,
+ gpu_cache,
+ atlas_id,
+ },
+ );
+ }
+ }
+
+ if let Some(ub) = upload_bounds {
+ queue.write_texture(
+ ImageCopyTexture {
+ texture: &self.atlas_texture,
+ mip_level: 0,
+ origin: Origin3d {
+ x: ub.x_min as u32,
+ y: ub.y_min as u32,
+ z: 0,
+ },
+ aspect: TextureAspect::All,
+ },
+ &self.atlas_texture_pending[ub.y_min * self.atlas_width as usize + ub.x_min..],
+ ImageDataLayout {
+ offset: 0,
+ bytes_per_row: NonZeroU32::new(self.atlas_width as u32),
+ rows_per_image: NonZeroU32::new(self.atlas_height as u32),
+ },
+ Extent3d {
+ width: (ub.x_max - ub.x_min) as u32,
+ height: (ub.y_max - ub.y_min) as u32,
+ depth_or_array_layers: 1,
+ },
+ );
+ }
+
+ let mut glyph_vertices = Vec::new();
+ let mut glyph_indices = Vec::new();
+ let mut glyphs_added = 0;
+
+ for layout in layouts.iter() {
+ for glyph in layout.glyphs() {
+ let details = self.glyph_cache.get_mut(&glyph.key).unwrap();
+ let (atlas_x, atlas_y) = match details.gpu_cache {
+ GpuCache::InAtlas { x, y } => (x, y),
+ GpuCache::SkipRasterization => continue,
+ };
+
+ glyph_vertices.extend(
+ iter::repeat(GlyphToRender {
+ x: glyph.x,
+ y: glyph.y,
+ width: details.width as f32,
+ height: details.height as f32,
+ atlas_x: atlas_x as f32,
+ atlas_y: atlas_y as f32,
+ color: [255, 255, 0, 255],
+ })
+ .take(4),
+ );
+
+ let start = 4 * glyphs_added as u32;
+ glyph_indices.extend([start, start + 1, start + 2, start, start + 2, start + 3]);
+
+ glyphs_added += 1;
+ }
+ }
+
+ const VERTICES_PER_GLYPH: u32 = 6;
+ self.vertices_to_render = glyphs_added as u32 * VERTICES_PER_GLYPH;
+
+ let will_render = glyphs_added > 0;
+ if !will_render {
+ return Ok(());
+ }
+
+ let vertices = glyph_vertices.as_slice();
+ let vertices_raw = unsafe {
+ slice::from_raw_parts(
+ vertices as *const _ as *const u8,
+ mem::size_of::() * vertices.len(),
+ )
+ };
+
+ if self.vertex_buffer_size >= vertices_raw.len() as u64 {
+ queue.write_buffer(&self.vertex_buffer, 0, vertices_raw);
+ } else {
+ self.vertex_buffer.destroy();
+ self.vertex_buffer_size = vertices_raw.len().next_power_of_two() as u64;
+ self.vertex_buffer = device.create_buffer_init(&BufferInitDescriptor {
+ label: Some("glyphon vertices"),
+ contents: vertices_raw,
+ usage: BufferUsages::VERTEX | BufferUsages::COPY_DST,
+ });
+ }
+
+ let indices = glyph_indices.as_slice();
+ let indices_raw = unsafe {
+ slice::from_raw_parts(
+ indices as *const _ as *const u8,
+ mem::size_of::() * indices.len(),
+ )
+ };
+
+ if self.index_buffer_size >= indices_raw.len() as u64 {
+ queue.write_buffer(&self.index_buffer, 0, indices_raw);
+ } else {
+ self.index_buffer.destroy();
+ self.index_buffer_size = indices_raw.len().next_power_of_two() as u64;
+ self.index_buffer = device.create_buffer_init(&BufferInitDescriptor {
+ label: Some("glyphon indices"),
+ contents: indices_raw,
+ usage: BufferUsages::INDEX | BufferUsages::COPY_DST,
+ });
+ }
+
+ Ok(())
+ }
+
+ pub fn render<'pass>(&'pass mut self, pass: &mut RenderPass<'pass>) -> Result<(), ()> {
+ if self.vertices_to_render == 0 {
+ return Ok(());
+ }
+
+ pass.set_pipeline(&self.pipeline);
+ pass.set_bind_group(0, &self.bind_group, &[]);
+ pass.set_vertex_buffer(0, self.vertex_buffer.slice(..));
+ pass.set_index_buffer(self.index_buffer.slice(..), IndexFormat::Uint32);
+ pass.draw_indexed(0..self.vertices_to_render, 0, 0..1);
+
+ Ok(())
+ }
+}
diff --git a/src/shader.wgsl b/src/shader.wgsl
new file mode 100644
index 0000000..b1b21b4
--- /dev/null
+++ b/src/shader.wgsl
@@ -0,0 +1,71 @@
+struct VertexOutput {
+ @builtin(position) position: vec4,
+ @location(0) color: vec4,
+ @location(1) tex_coords: vec2,
+};
+
+struct Params {
+ screen_resolution: vec2,
+};
+
+@group(0) @binding(0)
+var params: Params;
+
+@group(0) @binding(1)
+var atlas_texture: texture_2d;
+
+@group(0) @binding(2)
+var atlas_sampler: sampler;
+
+@vertex
+fn vs_main(@builtin(vertex_index) vertex_idx: u32, @location(0) in_vert: vec4, @location(1) tex_coords: vec2, @location(2) color: u32) -> VertexOutput {
+ let width = in_vert.z;
+ let height = in_vert.w;
+
+ let v = vertex_idx % 4u;
+ var pos = in_vert.xy;
+ var uv = tex_coords;
+
+ switch v {
+ case 0u: {
+ }
+ case 1u: {
+ pos.x += width;
+ uv.x += width;
+ }
+ case 2u: {
+ pos.x += width;
+ pos.y += height;
+ uv.x += width;
+ uv.y += height;
+ }
+ case 3u: {
+ pos.y += height;
+ uv.y += height;
+ }
+ default: {}
+ }
+
+ pos = 2.0 * pos / vec2(params.screen_resolution) - 1.0;
+ pos.y *= -1.0;
+
+ var vert_output: VertexOutput;
+
+ vert_output.position = vec4(pos.xy, 0.0, 1.0);
+
+ vert_output.color = vec4(
+ f32((color & 0xffu)),
+ f32((color & 0xff00u) >> 8u),
+ f32((color & 0xff0000u) >> 16u),
+ f32((color & 0xff000000u) >> 24u),
+ ) / 255.0;
+
+ vert_output.tex_coords = uv / vec2(textureDimensions(atlas_texture).xy);
+
+ return vert_output;
+}
+
+@fragment
+fn fs_main(in_frag: VertexOutput) -> @location(0) vec4 {
+ return in_frag.color * textureSample(atlas_texture, atlas_sampler, in_frag.tex_coords).x;
+}
+ 
+ 
+ 
+