From 67d07b0c558a7f2e42699010d78d6d8300de2884 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Tue, 16 Aug 2022 17:10:02 -0700
Subject: [PATCH] gpu: add BindGroupLayout.Descriptor slice helper

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 gpu/src/bind_group_layout.zig | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/gpu/src/bind_group_layout.zig b/gpu/src/bind_group_layout.zig
index c6cc2022..8a0ffdda 100644
--- a/gpu/src/bind_group_layout.zig
+++ b/gpu/src/bind_group_layout.zig
@@ -92,9 +92,22 @@ pub const BindGroupLayout = opaque {
     pub const Descriptor = extern struct {
         next_in_chain: ?*const ChainedStruct = null,
         label: ?[*:0]const u8 = null,
-        // TODO: slice helper
         entry_count: u32 = 0,
         entries: ?[*]const Entry = null,
+
+        /// Provides a slightly friendlier Zig API to initialize this structure.
+        pub fn init(v: struct {
+            next_in_chain: ?*const ChainedStruct = null,
+            label: ?[*:0]const u8 = null,
+            entries: ?[]const Entry = null,
+        }) Descriptor {
+            return .{
+                .next_in_chain = v.next_in_chain,
+                .label = v.label,
+                .entry_count = if (v.entries) |e| @intCast(u32, e.len) else 0,
+                .entries = if (v.entries) |e| e.ptr else null,
+            };
+        }
     };
 
     pub inline fn setLabel(bind_group_layout: *BindGroupLayout, label: [*:0]const u8) void {