From cd6691f6bbdf6d6e8686cc4b2b6f0a08b20482f2 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Thu, 17 Mar 2022 11:19:02 -0700
Subject: [PATCH] gpu: implement CommandEncoder.copyBufferToBuffer

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 gpu/src/CommandEncoder.zig | 15 +++++++++++++--
 gpu/src/NativeInstance.zig | 19 +++++++++++++++++++
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/gpu/src/CommandEncoder.zig b/gpu/src/CommandEncoder.zig
index 68c0d9d5..26205bd7 100644
--- a/gpu/src/CommandEncoder.zig
+++ b/gpu/src/CommandEncoder.zig
@@ -17,8 +17,7 @@ pub const VTable = struct {
     beginComputePass: fn (ptr: *anyopaque, descriptor: *const ComputePassEncoder.Descriptor) ComputePassEncoder,
     beginRenderPass: fn (ptr: *anyopaque, descriptor: *const RenderPassEncoder.Descriptor) RenderPassEncoder,
     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,
-    // WGPU_EXPORT void wgpuCommandEncoderCopyBufferToBuffer(WGPUCommandEncoder commandEncoder, WGPUBuffer source, uint64_t sourceOffset, WGPUBuffer destination, uint64_t destinationOffset, uint64_t size);
+    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: Extent3D) void,
     // WGPU_EXPORT void wgpuCommandEncoderCopyBufferToTexture(WGPUCommandEncoder commandEncoder, WGPUImageCopyBuffer const * source, WGPUImageCopyTexture const * destination, WGPUExtent3D const * copySize);
     // copyTextureToBuffer: fn (ptr: *anyopaque, source: *const ImageCopyTexture, destination: *const ImageCopyBuffer, copy_size: Extent3D) void,
@@ -59,6 +58,17 @@ pub inline fn clearBuffer(enc: CommandEncoder, buffer: Buffer, offset: u64, size
     enc.vtable.clearBuffer(enc.ptr, buffer, offset, size);
 }
 
+pub inline fn copyBufferToBuffer(
+    enc: CommandEncoder,
+    source: Buffer,
+    source_offset: u64,
+    destination: Buffer,
+    destination_offset: u64,
+    size: u64,
+) void {
+    enc.vtable.copyBufferToBuffer(enc.ptr, source, source_offset, destination, destination_offset, size);
+}
+
 pub inline fn finish(enc: CommandEncoder, descriptor: ?*const CommandBuffer.Descriptor) CommandBuffer {
     return enc.vtable.finish(enc.ptr, descriptor);
 }
@@ -94,6 +104,7 @@ test {
     _ = beginComputePass;
     _ = beginRenderPass;
     _ = clearBuffer;
+    _ = copyBufferToBuffer;
     _ = finish;
     _ = insertDebugMarker;
     _ = popDebugGroup;
diff --git a/gpu/src/NativeInstance.zig b/gpu/src/NativeInstance.zig
index 07e5a815..ed61535e 100644
--- a/gpu/src/NativeInstance.zig
+++ b/gpu/src/NativeInstance.zig
@@ -1615,6 +1615,25 @@ const command_encoder_vtable = CommandEncoder.VTable{
             );
         }
     }).clearBuffer,
+    .copyBufferToBuffer = (struct {
+        pub fn copyBufferToBuffer(
+            ptr: *anyopaque,
+            source: Buffer,
+            source_offset: u64,
+            destination: Buffer,
+            destination_offset: u64,
+            size: u64,
+        ) void {
+            c.wgpuCommandEncoderCopyBufferToBuffer(
+                @ptrCast(c.WGPUCommandEncoder, ptr),
+                @ptrCast(c.WGPUBuffer, source.ptr),
+                source_offset,
+                @ptrCast(c.WGPUBuffer, destination.ptr),
+                destination_offset,
+                size,
+            );
+        }
+    }).copyBufferToBuffer,
     .popDebugGroup = (struct {
         pub fn popDebugGroup(ptr: *anyopaque) void {
             c.wgpuCommandEncoderPopDebugGroup(@ptrCast(c.WGPUCommandEncoder, ptr));