ursus_core/render/gfx/sampler/
desc.rs

1use ash::vk;
2
3#[derive(Debug, Clone, Copy, PartialEq, Eq)]
4pub enum Filter {
5    Nearest,
6    Linear,
7}
8
9#[derive(Debug, Clone, Copy, PartialEq, Eq)]
10pub enum AddressMode {
11    ClampToEdge,
12    ClampToBorderOpaqueWhite,
13}
14
15#[derive(Debug, Clone, Copy)]
16pub struct SamplerDesc {
17    pub filter: Filter,
18    pub address_mode: AddressMode,
19    pub compare_less_or_equal: bool,
20}
21
22impl SamplerDesc {
23    pub fn linear_clamp() -> Self {
24        Self { filter: Filter::Linear, address_mode: AddressMode::ClampToEdge, compare_less_or_equal: false }
25    }
26    pub fn nearest_clamp() -> Self {
27        Self { filter: Filter::Nearest, address_mode: AddressMode::ClampToEdge, compare_less_or_equal: false }
28    }
29    pub fn shadow_compare() -> Self {
30        Self {
31            filter: Filter::Linear,
32            address_mode: AddressMode::ClampToBorderOpaqueWhite,
33            compare_less_or_equal: true,
34        }
35    }
36}
37
38pub fn create_from_desc(device: &ash::Device, desc: SamplerDesc) -> anyhow::Result<vk::Sampler> {
39    let filter = match desc.filter {
40        Filter::Nearest => vk::Filter::NEAREST,
41        Filter::Linear => vk::Filter::LINEAR,
42    };
43    let address_mode = match desc.address_mode {
44        AddressMode::ClampToEdge => vk::SamplerAddressMode::CLAMP_TO_EDGE,
45        AddressMode::ClampToBorderOpaqueWhite => vk::SamplerAddressMode::CLAMP_TO_BORDER,
46    };
47
48    let mut info = vk::SamplerCreateInfo::default()
49        .mag_filter(filter)
50        .min_filter(filter)
51        .address_mode_u(address_mode)
52        .address_mode_v(address_mode);
53
54    if matches!(desc.address_mode, AddressMode::ClampToBorderOpaqueWhite) {
55        info = info.border_color(vk::BorderColor::FLOAT_OPAQUE_WHITE);
56    }
57
58    if desc.compare_less_or_equal {
59        info = info.compare_enable(true).compare_op(vk::CompareOp::LESS_OR_EQUAL);
60    }
61
62    Ok(unsafe { device.create_sampler(&info, None)? })
63}
ursus_core/render/gfx/sampler/desc.rs

ursus_core/render/gfx/sampler/
desc.rs
