mtl-rs 0.1.10

Rust bindings for Apple's Metal API
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use core::ops::Range;

use objc2::{
    extern_class, extern_conformance, extern_methods, msg_send,
    rc::{Allocated, Retained},
    runtime::NSObject,
};
use objc2_foundation::{CopyingHelper, NSCopying, NSObjectProtocol, NSRange};

use crate::{MTLPixelFormat, MTLTextureSwizzleChannels, MTLTextureType};

extern_class!(
    /// [Apple's documentation](https://developer.apple.com/documentation/metal/mtltextureviewdescriptor?language=objc)
    #[unsafe(super(NSObject))]
    #[derive(Debug, PartialEq, Eq, Hash)]
    pub struct MTLTextureViewDescriptor;
);

extern_conformance!(
    unsafe impl NSCopying for MTLTextureViewDescriptor {}
);

unsafe impl CopyingHelper for MTLTextureViewDescriptor {
    type Result = Self;
}

extern_conformance!(
    unsafe impl NSObjectProtocol for MTLTextureViewDescriptor {}
);

impl MTLTextureViewDescriptor {
    extern_methods!(
        /// A desired pixel format of a texture view.
        #[unsafe(method(pixelFormat))]
        #[unsafe(method_family = none)]
        pub fn pixel_format(&self) -> MTLPixelFormat;

        /// Setter for [`pixelFormat`][Self::pixelFormat].
        #[unsafe(method(setPixelFormat:))]
        #[unsafe(method_family = none)]
        pub fn set_pixel_format(
            &self,
            pixel_format: MTLPixelFormat,
        );

        /// A desired texture view of a texture view.
        #[unsafe(method(textureType))]
        #[unsafe(method_family = none)]
        pub fn texture_type(&self) -> MTLTextureType;

        /// Setter for [`textureType`][Self::textureType].
        #[unsafe(method(setTextureType:))]
        #[unsafe(method_family = none)]
        pub fn set_texture_type(
            &self,
            texture_type: MTLTextureType,
        );

        /// A desired swizzle format of a texture view.
        #[unsafe(method(swizzle))]
        #[unsafe(method_family = none)]
        pub fn swizzle(&self) -> MTLTextureSwizzleChannels;

        /// Setter for [`swizzle`][Self::swizzle].
        #[unsafe(method(setSwizzle:))]
        #[unsafe(method_family = none)]
        pub fn set_swizzle(
            &self,
            swizzle: MTLTextureSwizzleChannels,
        );
    );

    pub fn level_range(&self) -> Range<usize> {
        let ns_range: NSRange = unsafe { msg_send![self, levelRange] };
        ns_range.location..ns_range.location.saturating_add(ns_range.length)
    }

    pub fn set_level_range(
        &self,
        level_range: Range<usize>,
    ) {
        unsafe {
            let _: () = msg_send![self, setLevelRange: NSRange::from(level_range)];
        }
    }

    pub fn slice_range(&self) -> Range<usize> {
        let ns_range: NSRange = unsafe { msg_send![self, sliceRange] };
        ns_range.location..ns_range.location.saturating_add(ns_range.length)
    }

    pub fn set_slice_range(
        &self,
        slice_range: Range<usize>,
    ) {
        unsafe {
            let _: () = msg_send![self, setSliceRange: NSRange::from(slice_range)];
        }
    }
}

/// Methods declared on superclass `NSObject`.
impl MTLTextureViewDescriptor {
    extern_methods!(
        #[unsafe(method(init))]
        #[unsafe(method_family = init)]
        pub fn init(this: Allocated<Self>) -> Retained<Self>;

        #[unsafe(method(new))]
        #[unsafe(method_family = new)]
        pub fn new() -> Retained<Self>;
    );
}