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Simplify rendering pipeline, reduce gpu memory usage, remove duplicated data (#86)

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Pēteris Pakalns 2024-05-27 04:22:30 +03:00 committed by GitHub
parent b411ea71e7
commit 0fdbd90c55
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3 changed files with 38 additions and 104 deletions
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13
src/cache.rs
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@ -5,9 +5,9 @@ use wgpu::{
BindingResource, BindingType, BlendState, Buffer, BufferBindingType, ColorTargetState,
ColorWrites, DepthStencilState, Device, FilterMode, FragmentState, MultisampleState,
PipelineCompilationOptions, PipelineLayout, PipelineLayoutDescriptor, PrimitiveState,
RenderPipeline, RenderPipelineDescriptor, Sampler, SamplerBindingType, SamplerDescriptor,
ShaderModule, ShaderModuleDescriptor, ShaderSource, ShaderStages, TextureFormat,
TextureSampleType, TextureView, TextureViewDimension, VertexFormat, VertexState,
PrimitiveTopology, RenderPipeline, RenderPipelineDescriptor, Sampler, SamplerBindingType,
SamplerDescriptor, ShaderModule, ShaderModuleDescriptor, ShaderSource, ShaderStages,
TextureFormat, TextureSampleType, TextureView, TextureViewDimension, VertexFormat, VertexState,
};
use std::borrow::Cow;
@ -56,7 +56,7 @@ impl Cache {
let vertex_buffer_layout = wgpu::VertexBufferLayout {
array_stride: mem::size_of::<GlyphToRender>() as wgpu::BufferAddress,
step_mode: wgpu::VertexStepMode::Vertex,
step_mode: wgpu::VertexStepMode::Instance,
attributes: &[
wgpu::VertexAttribute {
format: VertexFormat::Sint32x2,
@ -232,7 +232,10 @@ impl Cache {
})],
compilation_options: PipelineCompilationOptions::default(),
}),
primitive: PrimitiveState::default(),
primitive: PrimitiveState {
topology: PrimitiveTopology::TriangleStrip,
..Default::default()
},
depth_stencil: depth_stencil.clone(),
multisample,
multiview: None,

28
src/shader.wgsl
View file

@ -47,25 +47,17 @@ fn vs_main(in_vert: VertexInput) -> VertexOutput {
let height = (in_vert.dim & 0xffff0000u) >> 16u;
let color = in_vert.color;
var uv = vec2<u32>(in_vert.uv & 0xffffu, (in_vert.uv & 0xffff0000u) >> 16u);
let v = in_vert.vertex_idx % 4u;
let v = in_vert.vertex_idx;
switch v {
case 1u: {
pos.x += i32(width);
uv.x += width;
}
case 2u: {
pos.x += i32(width);
pos.y += i32(height);
uv.x += width;
uv.y += height;
}
case 3u: {
pos.y += i32(height);
uv.y += height;
}
default: {}
}
let corner_position = vec2<u32>(
in_vert.vertex_idx & 1u,
(in_vert.vertex_idx >> 1u) & 1u,
);
let corner_offset = vec2<u32>(width, height) * corner_position;
uv = uv + corner_offset;
pos = pos + vec2<i32>(corner_offset);
var vert_output: VertexOutput;

77
src/text_render.rs
View file

@ -2,23 +2,19 @@ use crate::{
ColorMode, FontSystem, GlyphDetails, GlyphToRender, GpuCacheStatus, PrepareError, RenderError,
SwashCache, SwashContent, TextArea, TextAtlas, Viewport,
};
use std::{iter, slice, sync::Arc};
use std::{slice, sync::Arc};
use wgpu::{
Buffer, BufferDescriptor, BufferUsages, DepthStencilState, Device, Extent3d, ImageCopyTexture,
ImageDataLayout, IndexFormat, MultisampleState, Origin3d, Queue, RenderPass, RenderPipeline,
TextureAspect, COPY_BUFFER_ALIGNMENT,
ImageDataLayout, MultisampleState, Origin3d, Queue, RenderPass, RenderPipeline, TextureAspect,
COPY_BUFFER_ALIGNMENT,
};
/// A text renderer that uses cached glyphs to render text into an existing render pass.
pub struct TextRenderer {
vertex_buffer: Buffer,
vertex_buffer_size: u64,
index_buffer: Buffer,
index_buffer_size: u64,
vertices_to_render: u32,
pipeline: Arc<RenderPipeline>,
glyph_vertices: Vec<GlyphToRender>,
glyph_indices: Vec<u32>,
}
impl TextRenderer {
@ -37,25 +33,13 @@ impl TextRenderer {
mapped_at_creation: false,
});
let index_buffer_size = next_copy_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,
});
let pipeline = atlas.get_or_create_pipeline(device, multisample, depth_stencil);
Self {
vertex_buffer,
vertex_buffer_size,
index_buffer,
index_buffer_size,
vertices_to_render: 0,
pipeline,
glyph_vertices: Vec::new(),
glyph_indices: Vec::new(),
}
}
@ -72,8 +56,6 @@ impl TextRenderer {
mut metadata_to_depth: impl FnMut(usize) -> f32,
) -> Result<(), PrepareError> {
self.glyph_vertices.clear();
self.glyph_indices.clear();
let mut glyphs_added = 0;
let resolution = viewport.resolution();
@ -257,8 +239,7 @@ impl TextRenderer {
let depth = metadata_to_depth(glyph.metadata);
self.glyph_vertices.extend(
iter::repeat(GlyphToRender {
self.glyph_vertices.push(GlyphToRender {
pos: [x, y],
dim: [width as u16, height as u16],
uv: [atlas_x, atlas_y],
@ -271,29 +252,12 @@ impl TextRenderer {
} as u16,
],
depth,
})
.take(4),
);
let start = 4 * glyphs_added as u32;
self.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;
let will_render = !self.glyph_vertices.is_empty();
if !will_render {
return Ok(());
}
@ -322,30 +286,6 @@ impl TextRenderer {
self.vertex_buffer_size = buffer_size;
}
let indices = self.glyph_indices.as_slice();
let indices_raw = unsafe {
slice::from_raw_parts(
indices as *const _ as *const u8,
std::mem::size_of_val(indices),
)
};
if self.index_buffer_size >= indices_raw.len() as u64 {
queue.write_buffer(&self.index_buffer, 0, indices_raw);
} else {
self.index_buffer.destroy();
let (buffer, buffer_size) = create_oversized_buffer(
device,
Some("glyphon indices"),
indices_raw,
BufferUsages::INDEX | BufferUsages::COPY_DST,
);
self.index_buffer = buffer;
self.index_buffer_size = buffer_size;
}
Ok(())
}
@ -378,7 +318,7 @@ impl TextRenderer {
viewport: &'pass Viewport,
pass: &mut RenderPass<'pass>,
) -> Result<(), RenderError> {
if self.vertices_to_render == 0 {
if self.glyph_vertices.is_empty() {
return Ok(());
}
@ -386,8 +326,7 @@ impl TextRenderer {
pass.set_bind_group(0, &atlas.bind_group, &[]);
pass.set_bind_group(1, &viewport.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);
pass.draw(0..4, 0..self.glyph_vertices.len() as u32);
Ok(())
}