mtl-rs 0.2.2

Rust bindings for Apple's Metal API
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use objc2::{Encode, Encoding, RefEncode};

use crate::texture::MTLTextureSwizzle;

/// Channel swizzle to use when reading or sampling from the texture (from `MTLTextureSwizzleChannels`).
#[repr(C)]
#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
pub struct MTLTextureSwizzleChannels {
    pub red: MTLTextureSwizzle,
    pub green: MTLTextureSwizzle,
    pub blue: MTLTextureSwizzle,
    pub alpha: MTLTextureSwizzle,
}

unsafe impl Encode for MTLTextureSwizzleChannels {
    const ENCODING: Encoding = Encoding::Struct(
        "?",
        &[
            MTLTextureSwizzle::ENCODING,
            MTLTextureSwizzle::ENCODING,
            MTLTextureSwizzle::ENCODING,
            MTLTextureSwizzle::ENCODING,
        ],
    );
}

unsafe impl RefEncode for MTLTextureSwizzleChannels {
    const ENCODING_REF: Encoding = Encoding::Pointer(&Self::ENCODING);
}

impl MTLTextureSwizzleChannels {
    /// Creates a channel mapping.
    ///
    /// This is the Rust equivalent of Metal's
    /// `MTLTextureSwizzleChannelsMake` inline helper.
    pub const fn new(
        red: MTLTextureSwizzle,
        green: MTLTextureSwizzle,
        blue: MTLTextureSwizzle,
        alpha: MTLTextureSwizzle,
    ) -> Self {
        Self {
            red,
            green,
            blue,
            alpha,
        }
    }

    /// Metal's default red, green, blue, alpha channel mapping.
    pub const DEFAULT: Self =
        Self::new(MTLTextureSwizzle::Red, MTLTextureSwizzle::Green, MTLTextureSwizzle::Blue, MTLTextureSwizzle::Alpha);
}

impl Default for MTLTextureSwizzleChannels {
    fn default() -> Self {
        Self::DEFAULT
    }
}