grafix_toolbox/kit/opengl/texture/
format.rs

1use crate::lib::*;
2
3pub trait TexSize: TrivialBound {
4	const TYPE: GLenum;
5	const SIZE: i32;
6}
7macro_rules! impl_size {
8	($t: ident, $s: literal) => {
9		derive_common_VAL! { pub struct $t; }
10		impl TexSize for $t {
11			const TYPE: GLenum = gl::$t;
12			const SIZE: i32 = $s;
13		}
14	};
15}
16impl_size!(RED, 1);
17impl_size!(RG, 2);
18impl_size!(RGB, 3);
19impl_size!(RGBA, 4);
20
21pub trait TexFmt: TrivialBound {
22	const TYPE: GLenum;
23}
24macro_rules! impl_fmt {
25	($t: ty, $g: ident) => {
26		impl TexFmt for $t {
27			const TYPE: GLenum = gl::$g;
28		}
29	};
30}
31impl_fmt!(i8, BYTE);
32impl_fmt!(u8, UNSIGNED_BYTE);
33impl_fmt!(i16, SHORT);
34impl_fmt!(u16, UNSIGNED_SHORT);
35impl_fmt!(i32, INT);
36impl_fmt!(u32, UNSIGNED_INT);
37impl_fmt!(f16, HALF_FLOAT);
38impl_fmt!(f32, FLOAT);
39
40pub fn get_internal_fmt<S: TexSize, F: TexFmt>() -> GLenum {
41	match S::TYPE {
42		gl::RED => match F::TYPE {
43			gl::BYTE => gl::R8I,
44			gl::UNSIGNED_BYTE => gl::R8UI,
45			gl::SHORT => gl::R16I,
46			gl::UNSIGNED_SHORT => gl::R16UI,
47			gl::INT => gl::R32I,
48			gl::UNSIGNED_INT => gl::R32UI,
49			gl::HALF_FLOAT => gl::R16F,
50			gl::FLOAT => gl::R32F,
51			_ => unreachable!(),
52		},
53		gl::RG => match F::TYPE {
54			gl::BYTE => gl::RG8I,
55			gl::UNSIGNED_BYTE => gl::RG8UI,
56			gl::SHORT => gl::RG16I,
57			gl::UNSIGNED_SHORT => gl::RG16UI,
58			gl::INT => gl::RG32I,
59			gl::UNSIGNED_INT => gl::RG32UI,
60			gl::HALF_FLOAT => gl::RG16F,
61			gl::FLOAT => gl::RG32F,
62			_ => unreachable!(),
63		},
64		gl::RGB => match F::TYPE {
65			gl::BYTE => gl::RGB8I,
66			gl::UNSIGNED_BYTE => gl::RGB8UI,
67			gl::SHORT => gl::RGB16I,
68			gl::UNSIGNED_SHORT => gl::RGB16UI,
69			gl::INT => gl::RGB32I,
70			gl::UNSIGNED_INT => gl::RGB32UI,
71			gl::HALF_FLOAT => gl::RGB16F,
72			gl::FLOAT => gl::RGB32F,
73			_ => unreachable!(),
74		},
75		gl::RGBA => match F::TYPE {
76			gl::BYTE => gl::RGBA8I,
77			gl::UNSIGNED_BYTE => gl::RGBA8UI,
78			gl::SHORT => gl::RGBA16I,
79			gl::UNSIGNED_SHORT => gl::RGBA16UI,
80			gl::INT => gl::RGBA32I,
81			gl::UNSIGNED_INT => gl::RGBA32UI,
82			gl::HALF_FLOAT => gl::RGBA16F,
83			gl::FLOAT => gl::RGBA32F,
84			_ => unreachable!(),
85		},
86		_ => unreachable!(),
87	}
88}
89
90pub fn normalize_internal_fmt(fmt: GLenum) -> GLenum {
91	match fmt {
92		gl::R8I | gl::R8UI => gl::R8,
93		gl::R16I | gl::R16UI => gl::R16,
94
95		gl::RG8I | gl::RG8UI => gl::RG8,
96		gl::RG16I | gl::RG16UI => gl::RG16,
97
98		gl::RGB8I | gl::RGB8UI => gl::RGB8,
99		gl::RGB16I | gl::RGB16UI => gl::RGB16,
100
101		gl::RGBA8I | gl::RGBA8UI => gl::RGBA8,
102		gl::RGBA16I | gl::RGBA16UI => gl::RGBA16,
103
104		f => f,
105	}
106}
grafix_toolbox/kit/opengl/texture/format.rs

grafix_toolbox/kit/opengl/texture/
format.rs
