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//! Wrapper for handling samplers.
const Self = @This();
const std = @import("std");
const Allocator = std.mem.Allocator;
const assert = std.debug.assert;
const builtin = @import("builtin");
const objc = @import("objc");
const mtl = @import("api.zig");
const Metal = @import("../Metal.zig");
const log = std.log.scoped(.metal);
/// Options for initializing a sampler.
pub const Options = struct {
/// MTLDevice
device: objc.Object,
min_filter: mtl.MTLSamplerMinMagFilter,
mag_filter: mtl.MTLSamplerMinMagFilter,
s_address_mode: mtl.MTLSamplerAddressMode,
t_address_mode: mtl.MTLSamplerAddressMode,
};
/// The underlying MTLSamplerState Object.
sampler: objc.Object,
pub const Error = error{
/// A Metal API call failed.
MetalFailed,
};
/// Initialize a sampler
pub fn init(
opts: Options,
) Error!Self {
// Create our descriptor
const desc = init: {
const Class = objc.getClass("MTLSamplerDescriptor").?;
const id_alloc = Class.msgSend(objc.Object, objc.sel("alloc"), .{});
const id_init = id_alloc.msgSend(objc.Object, objc.sel("init"), .{});
break :init id_init;
};
defer desc.release();
// Properties
desc.setProperty("minFilter", opts.min_filter);
desc.setProperty("magFilter", opts.mag_filter);
desc.setProperty("sAddressMode", opts.s_address_mode);
desc.setProperty("tAddressMode", opts.t_address_mode);
// Create the sampler state
const id = opts.device.msgSend(
?*anyopaque,
objc.sel("newSamplerStateWithDescriptor:"),
.{desc},
) orelse return error.MetalFailed;
return .{
.sampler = objc.Object.fromId(id),
};
}
pub fn deinit(self: Self) void {
self.sampler.release();
}
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