From ef3eed7afb788d90660ea547d0826358330a1a75 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Fri, 11 Mar 2022 20:14:58 -0700
Subject: [PATCH] gpu: implement SwapChain.present,
 SwapChain.getCurrentTextureView

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 gpu/src/NativeInstance.zig | 10 ++++++++++
 gpu/src/SwapChain.zig      | 15 ++++++++++++---
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/gpu/src/NativeInstance.zig b/gpu/src/NativeInstance.zig
index dffe534b..ad02d1a5 100644
--- a/gpu/src/NativeInstance.zig
+++ b/gpu/src/NativeInstance.zig
@@ -587,6 +587,16 @@ const swap_chain_vtable = SwapChain.VTable{
             );
         }
     }).configure,
+    .getCurrentTextureView = (struct {
+        pub fn getCurrentTextureView(ptr: *anyopaque) TextureView {
+            return wrapTextureView(c.wgpuSwapChainGetCurrentTextureView(@ptrCast(c.WGPUSwapChain, ptr)));
+        }
+    }).getCurrentTextureView,
+    .present = (struct {
+        pub fn present(ptr: *anyopaque) void {
+            c.wgpuSwapChainPresent(@ptrCast(c.WGPUSwapChain, ptr));
+        }
+    }).present,
 };
 
 fn wrapTextureView(texture_view: c.WGPUTextureView) TextureView {
diff --git a/gpu/src/SwapChain.zig b/gpu/src/SwapChain.zig
index f17b7595..e8ac14f8 100644
--- a/gpu/src/SwapChain.zig
+++ b/gpu/src/SwapChain.zig
@@ -1,5 +1,6 @@
 const std = @import("std");
 const Texture = @import("Texture.zig");
+const TextureView = @import("TextureView.zig");
 const PresentMode = @import("enums.zig").PresentMode;
 
 const SwapChain = @This();
@@ -13,9 +14,8 @@ pub const VTable = struct {
     reference: fn (ptr: *anyopaque) void,
     release: fn (ptr: *anyopaque) void,
     configure: fn (ptr: *anyopaque, format: Texture.Format, allowed_usage: Texture.Usage, width: u32, height: u32) void,
-    // TODO:
-    // WGPU_EXPORT WGPUTextureView wgpuSwapChainGetCurrentTextureView(WGPUSwapChain swapChain);
-    // WGPU_EXPORT void wgpuSwapChainPresent(WGPUSwapChain swapChain);
+    getCurrentTextureView: fn (ptr: *anyopaque) TextureView,
+    present: fn (ptr: *anyopaque) void,
 };
 
 pub inline fn reference(swap_chain: SwapChain) void {
@@ -26,6 +26,7 @@ pub inline fn release(swap_chain: SwapChain) void {
     swap_chain.vtable.release(swap_chain.ptr);
 }
 
+// TODO: remove this and/or prefix with dawn? Seems to be deprecated / not in upstream webgpu.h
 pub inline fn configure(
     swap_chain: SwapChain,
     format: Texture.Format,
@@ -36,6 +37,14 @@ pub inline fn configure(
     swap_chain.vtable.configure(swap_chain.ptr, format, allowed_usage, width, height);
 }
 
+pub inline fn getCurrentTextureView(swap_chain: SwapChain) TextureView {
+    return swap_chain.vtable.getCurrentTextureView(swap_chain.ptr);
+}
+
+pub inline fn present(swap_chain: SwapChain) void {
+    swap_chain.vtable.present(swap_chain.ptr);
+}
+
 pub const Descriptor = struct {
     label: ?[:0]const u8 = null,
     usage: Texture.Usage,