From 77e96864eae72d7c782a01e410c87d815bf0d13b Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Thu, 11 Aug 2022 05:14:04 -0700
Subject: [PATCH] gpu: make Queue.writeTexture use a slice helper

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 gpu/README.md     |  2 +-
 gpu/src/queue.zig | 18 ++++++++++++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/gpu/README.md b/gpu/README.md
index c56af44a..2698af8b 100644
--- a/gpu/README.md
+++ b/gpu/README.md
@@ -152,6 +152,7 @@ Some WebGPU APIs expose slices as pointers and lengths, we either wrap these to
 The slice helpers are:
 
 * `Adapter.enumerateFeaturesOwned`
+* `Queue.writeTexture`
 
 ### Typed callbacks
 
@@ -219,7 +220,6 @@ The following are definitive candidates for helpers we haven't implemented yet:
 * `gpu.ComputePassEncoder.setBindGroup` (slice param)
 * `gpu.Device.enumerateFeatures` (owned slice)
 * `gpu.Queue.writeBuffer` (slices)
-* `gpu.Queue.writeTexture` (slices)
 * `gpu.RenderBundleEncoder.setBindGroup` (slice param)
 * `gpu.RenderPassEncoder.executeBundles` (slice param)
 * `gpu.RenderPassEncoder.setBindGroup` (slice param)
diff --git a/gpu/src/queue.zig b/gpu/src/queue.zig
index 1a4937f6..b955eb2f 100644
--- a/gpu/src/queue.zig
+++ b/gpu/src/queue.zig
@@ -57,8 +57,22 @@ pub const Queue = opaque {
         Impl.queueWriteBuffer(queue, buffer, buffer_offset, data, size);
     }
 
-    pub inline fn writeTexture(queue: *Queue, destination: *const ImageCopyTexture, data: *const anyopaque, data_size: usize, data_layout: *const Texture.DataLayout, write_size: *const Extent3D) void {
-        Impl.queueWriteTexture(queue, destination, data, data_size, data_layout, write_size);
+    pub inline fn writeTexture(
+        queue: *Queue,
+        destination: *const ImageCopyTexture,
+        data_layout: *const Texture.DataLayout,
+        write_size: *const Extent3D,
+        comptime T: type,
+        data: []const T,
+    ) void {
+        Impl.queueWriteTexture(
+            queue,
+            destination,
+            @ptrCast(*const anyopaque, data.ptr),
+            @intCast(usize, data.len) * @sizeOf(std.meta.Elem(@TypeOf(data))),
+            data_layout,
+            write_size,
+        );
     }
 
     pub inline fn reference(queue: *Queue) void {