//! A native WebGPU surface

const Surface = @This();

/// The type erased pointer to the Surface implementation
/// Equal to c.WGPUSurface for NativeInstance.
ptr: *anyopaque,
vtable: *const VTable,

pub const VTable = struct {
    reference: fn (ptr: *anyopaque) void,
    release: fn (ptr: *anyopaque) void,
};

pub inline fn reference(surface: Surface) void {
    surface.vtable.reference(surface.ptr);
}

pub inline fn release(surface: Surface) void {
    surface.vtable.release(surface.ptr);
}

pub const DescriptorTag = enum {
    metal_layer,
    windows_hwnd,
    windows_core_window,
    windows_swap_chain_panel,
    xlib,
    canvas_html_selector,
};

// TODO: docs
pub const Descriptor = union(DescriptorTag) {
    metal_layer: struct {
        label: ?[*:0]const u8 = null,
        layer: *anyopaque,
    },
    windows_hwnd: struct {
        label: ?[*:0]const u8 = null,
        hinstance: *anyopaque,
        hwnd: *anyopaque,
    },
    windows_core_window: struct {
        label: ?[*:0]const u8 = null,
        core_window: *anyopaque,
    },
    windows_swap_chain_panel: struct {
        label: ?[*:0]const u8 = null,
        swap_chain_panel: *anyopaque,
    },
    xlib: struct {
        label: ?[*:0]const u8 = null,
        display: *anyopaque,
        window: u32,
    },
    canvas_html_selector: struct {
        label: ?[*:0]const u8 = null,
        selector: ?[*:0]const u8,
    },
};

test "syntax" {
    _ = VTable;
    _ = reference;
    _ = release;
    _ = DescriptorTag;
    _ = Descriptor;
}