me/iced
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Avoid creating a vertex buffer every frame

Browse source
This commit is contained in:
Héctor Ramón Jiménez 2020-02-26 12:52:30 +01:00
parent 59d45a5440
commit c58d94f3fd
5 changed files with 73 additions and 48 deletions
Download patch file Download diff file Expand all files Collapse all files

105
wgpu/src/image.rs
View file

@ -22,6 +22,7 @@ pub struct Pipeline {
uniforms: wgpu::Buffer,
vertices: wgpu::Buffer,
indices: wgpu::Buffer,
instances: wgpu::Buffer,
constants: wgpu::BindGroup,
texture: wgpu::BindGroup,
texture_version: usize,
@ -188,7 +189,7 @@ impl Pipeline {
},
wgpu::VertexAttributeDescriptor {
shader_location: 5,
format: wgpu::VertexFormat::Float,
format: wgpu::VertexFormat::Uint,
offset: 4 * 8,
},
],
@ -207,6 +208,11 @@ impl Pipeline {
.create_buffer_mapped(QUAD_INDICES.len(), wgpu::BufferUsage::INDEX)
.fill_from_slice(&QUAD_INDICES);
let instances = device.create_buffer(&wgpu::BufferDescriptor {
size: mem::size_of::<Instance>() as u64 * Instance::MAX as u64,
usage: wgpu::BufferUsage::VERTEX | wgpu::BufferUsage::COPY_DST,
});
let texture_atlas = texture::Atlas::new(device);
let texture = device.create_bind_group(&wgpu::BindGroupDescriptor {
@ -230,6 +236,7 @@ impl Pipeline {
uniforms: uniforms_buffer,
vertices,
indices,
instances,
constants: constant_bind_group,
texture,
texture_version: texture_atlas.layer_count(),
@ -341,49 +348,67 @@ impl Pipeline {
);
let instances_buffer = device
.create_buffer_mapped(instances.len(), wgpu::BufferUsage::VERTEX)
.create_buffer_mapped(instances.len(), wgpu::BufferUsage::COPY_SRC)
.fill_from_slice(&instances);
let mut render_pass =
encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
color_attachments: &[
wgpu::RenderPassColorAttachmentDescriptor {
attachment: target,
resolve_target: None,
load_op: wgpu::LoadOp::Load,
store_op: wgpu::StoreOp::Store,
clear_color: wgpu::Color {
r: 0.0,
g: 0.0,
b: 0.0,
a: 0.0,
let mut i = 0;
let total = instances.len();
while i < total {
let end = (i + Instance::MAX).min(total);
let amount = end - i;
encoder.copy_buffer_to_buffer(
&instances_buffer,
(i * std::mem::size_of::<Instance>()) as u64,
&self.instances,
0,
(amount * std::mem::size_of::<Instance>()) as u64,
);
let mut render_pass =
encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
color_attachments: &[
wgpu::RenderPassColorAttachmentDescriptor {
attachment: target,
resolve_target: None,
load_op: wgpu::LoadOp::Load,
store_op: wgpu::StoreOp::Store,
clear_color: wgpu::Color {
r: 0.0,
g: 0.0,
b: 0.0,
a: 0.0,
},
},
},
],
depth_stencil_attachment: None,
});
],
depth_stencil_attachment: None,
});
render_pass.set_pipeline(&self.pipeline);
render_pass.set_bind_group(0, &self.constants, &[]);
render_pass.set_bind_group(1, &self.texture, &[]);
render_pass.set_index_buffer(&self.indices, 0);
render_pass.set_vertex_buffers(
0,
&[(&self.vertices, 0), (&instances_buffer, 0)],
);
render_pass.set_pipeline(&self.pipeline);
render_pass.set_bind_group(0, &self.constants, &[]);
render_pass.set_bind_group(1, &self.texture, &[]);
render_pass.set_index_buffer(&self.indices, 0);
render_pass.set_vertex_buffers(
0,
&[(&self.vertices, 0), (&self.instances, 0)],
);
render_pass.set_scissor_rect(
bounds.x,
bounds.y,
bounds.width,
bounds.height,
);
render_pass.set_scissor_rect(
bounds.x,
bounds.y,
bounds.width,
bounds.height,
);
render_pass.draw_indexed(
0..QUAD_INDICES.len() as u32,
0,
0..instances.len() as u32,
);
render_pass.draw_indexed(
0..QUAD_INDICES.len() as u32,
0,
0..amount as u32,
);
i += Instance::MAX;
}
}
pub fn trim_cache(&mut self) {
@ -439,6 +464,10 @@ struct Instance {
_layer: u32,
}
impl Instance {
pub const MAX: usize = 1_000;
}
#[repr(C)]
#[derive(Debug, Clone, Copy)]
struct Uniforms {