grafix_toolbox/kit/opengl/texture/
sampler.rs

1use super::*;
2
3#[macro_export]
4macro_rules! Sampler {
5	($(($n: expr, $v: expr)),+) => {{
6		use $crate::GL::{macro_uses::sampler_use::id, gl::*};
7		let id = const { id(&[$($n, $v),+]) };
8		Sampler::pooled(id, &[$(($n, $v)),+])
9	}};
10}
11
12pub struct Sampler(pub(super) Rc<Obj<SamplerT>>);
13impl<S: Borrow<[(GLenum, GLenum)]>> From<S> for Sampler {
14	fn from(args: S) -> Self {
15		Obj::new()
16			.pipe(Rc::new)
17			.pipe(Self)
18			.tap(|s| args.borrow().iter().for_each(|&(p, v)| s.Parameter(p, v)))
19	}
20}
21impl Sampler {
22	pub fn Parameter(&mut self, name: GLenum, args: impl SamplerArg) {
23		args.apply(self.0.obj, name);
24	}
25	pub fn pooled(id: u32, args: &[(GLenum, GLenum)]) -> Self {
26		let p = LocalStatic!(HashMap<u32, rc::Weak<Obj<SamplerT>>>);
27
28		if let Some(w) = p.get(&id)
29			&& let Some(s) = w.upgrade()
30		{
31			ASSERT!(
32				LocalStatic!(HashMap<u32, Vec<(u32, u32)>>)
33					.entry(id)
34					.or_insert(args.to_vec())
35					.iter()
36					.eq(args.iter()),
37				"Sampler collision"
38			);
39			return Self(s);
40		}
41
42		Self::from(args).tap(|s| p.insert(id, Rc::downgrade(&s.0)).sink())
43	}
44	pub fn linear() -> Self {
45		Sampler!(
46			(TEXTURE_MIN_FILTER, LINEAR),
47			(TEXTURE_MAG_FILTER, LINEAR),
48			(TEXTURE_WRAP_R, CLAMP_TO_EDGE),
49			(TEXTURE_WRAP_S, CLAMP_TO_EDGE),
50			(TEXTURE_WRAP_T, CLAMP_TO_EDGE)
51		)
52	}
53}
54
55pub trait SamplerArg {
56	fn apply(&self, _: u32, _: GLenum);
57}
58impl SamplerArg for GLenum {
59	fn apply(&self, obj: u32, name: GLenum) {
60		GL!(gl::SamplerParameteri(obj, name, i32(self)));
61	}
62}
63impl SamplerArg for f32 {
64	fn apply(&self, obj: u32, name: GLenum) {
65		GL!(gl::SamplerParameterf(obj, name, *self));
66	}
67}
68impl SamplerArg for Vec4 {
69	fn apply(&self, obj: u32, name: GLenum) {
70		let s = [*self];
71		GL!(gl::SamplerParameterfv(obj, name, s.as_ptr() as *const f32));
72	}
73}
74
75pub mod sampler_use {
76	pub use super::chksum::const_fnv1_u32 as id;
77}
grafix_toolbox/kit/opengl/texture/sampler.rs

grafix_toolbox/kit/opengl/texture/
sampler.rs
