From de9cc72c47beea93a679379ca358b194481ec764 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Thu, 17 Mar 2022 11:39:59 -0700
Subject: [PATCH] gpu: implement CommandEncoder.copyTextureToBuffer

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 gpu/src/CommandEncoder.zig | 13 +++++++++++--
 gpu/src/NativeInstance.zig | 15 +++++++++++++++
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/gpu/src/CommandEncoder.zig b/gpu/src/CommandEncoder.zig
index 845c0233..6fa3b2b2 100644
--- a/gpu/src/CommandEncoder.zig
+++ b/gpu/src/CommandEncoder.zig
@@ -22,8 +22,7 @@ pub const VTable = struct {
     clearBuffer: fn (ptr: *anyopaque, buffer: Buffer, offset: u64, size: u64) void,
     copyBufferToBuffer: fn (ptr: *anyopaque, source: Buffer, source_offset: u64, destination: Buffer, destination_offset: u64, size: u64) void,
     copyBufferToTexture: fn (ptr: *anyopaque, source: *const ImageCopyBuffer, destination: *const ImageCopyTexture, copy_size: *const Extent3D) void,
-    // copyTextureToBuffer: fn (ptr: *anyopaque, source: *const ImageCopyTexture, destination: *const ImageCopyBuffer, copy_size: *const Extent3D) void,
-    // WGPU_EXPORT void wgpuCommandEncoderCopyTextureToBuffer(WGPUCommandEncoder commandEncoder, WGPUImageCopyTexture const * source, WGPUImageCopyBuffer const * destination, WGPUExtent3D const * copySize);
+    copyTextureToBuffer: fn (ptr: *anyopaque, source: *const ImageCopyTexture, destination: *const ImageCopyBuffer, copy_size: *const Extent3D) void,
     // copyTextureToTexture: fn (ptr: *anyopaque, source: *const ImageCopyTexture, destination: *const ImageCopyTexture, copy_size: *const Extent3D) void,
     // WGPU_EXPORT void wgpuCommandEncoderCopyTextureToTexture(WGPUCommandEncoder commandEncoder, WGPUImageCopyTexture const * source, WGPUImageCopyTexture const * destination, WGPUExtent3D const * copySize);
     finish: fn (ptr: *anyopaque, descriptor: ?*const CommandBuffer.Descriptor) CommandBuffer,
@@ -80,6 +79,15 @@ pub inline fn copyBufferToTexture(
     enc.vtable.copyBufferToTexture(enc.ptr, source, destination, copy_size);
 }
 
+pub inline fn copyTextureToBuffer(
+    enc: CommandEncoder,
+    source: *const ImageCopyTexture,
+    destination: *const ImageCopyBuffer,
+    copy_size: *const Extent3D,
+) void {
+    enc.vtable.copyTextureToBuffer(enc.ptr, source, destination, copy_size);
+}
+
 pub inline fn finish(enc: CommandEncoder, descriptor: ?*const CommandBuffer.Descriptor) CommandBuffer {
     return enc.vtable.finish(enc.ptr, descriptor);
 }
@@ -117,6 +125,7 @@ test {
     _ = clearBuffer;
     _ = copyBufferToBuffer;
     _ = copyBufferToTexture;
+    _ = copyTextureToBuffer;
     _ = finish;
     _ = insertDebugMarker;
     _ = popDebugGroup;
diff --git a/gpu/src/NativeInstance.zig b/gpu/src/NativeInstance.zig
index 4bd40346..33eb84ef 100644
--- a/gpu/src/NativeInstance.zig
+++ b/gpu/src/NativeInstance.zig
@@ -1654,6 +1654,21 @@ const command_encoder_vtable = CommandEncoder.VTable{
             );
         }
     }).copyBufferToTexture,
+    .copyTextureToBuffer = (struct {
+        pub fn copyTextureToBuffer(
+            ptr: *anyopaque,
+            source: *const ImageCopyTexture,
+            destination: *const ImageCopyBuffer,
+            copy_size: *const Extent3D,
+        ) void {
+            c.wgpuCommandEncoderCopyTextureToBuffer(
+                @ptrCast(c.WGPUCommandEncoder, ptr),
+                &convertImageCopyTexture(source),
+                &convertImageCopyBuffer(destination),
+                @ptrCast(*const c.WGPUExtent3D, copy_size),
+            );
+        }
+    }).copyTextureToBuffer,
     .popDebugGroup = (struct {
         pub fn popDebugGroup(ptr: *anyopaque) void {
             c.wgpuCommandEncoderPopDebugGroup(@ptrCast(c.WGPUCommandEncoder, ptr));