From b45ad53a1155574911716fb61b7631b02f96db7c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C4=83zvan=20C=2E=20R=C4=83dulescu?=
 <razcore.rad@gmail.com>
Date: Fri, 9 Jun 2023 09:03:25 +0300
Subject: [PATCH] gpu: make `swapChainGetCurrentTextureView()` return value
 optional

---
 libs/gpu/examples/main.zig  | 2 +-
 libs/gpu/src/dawn_impl.zig  | 4 ++--
 libs/gpu/src/interface.zig  | 6 +++---
 libs/gpu/src/swap_chain.zig | 2 +-
 shaderexp/main.zig          | 2 +-
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/libs/gpu/examples/main.zig b/libs/gpu/examples/main.zig
index 5e79a9a3..9443debd 100644
--- a/libs/gpu/examples/main.zig
+++ b/libs/gpu/examples/main.zig
@@ -140,7 +140,7 @@ fn frame(params: FrameParams) !void {
         pl.current_desc = pl.target_desc;
     }
 
-    const back_buffer_view = pl.swap_chain.?.getCurrentTextureView();
+    const back_buffer_view = pl.swap_chain.?.getCurrentTextureView().?;
     const color_attachment = gpu.RenderPassColorAttachment{
         .view = back_buffer_view,
         .resolve_target = null,
diff --git a/libs/gpu/src/dawn_impl.zig b/libs/gpu/src/dawn_impl.zig
index 2d661466..03019aff 100644
--- a/libs/gpu/src/dawn_impl.zig
+++ b/libs/gpu/src/dawn_impl.zig
@@ -1157,8 +1157,8 @@ pub const Interface = struct {
         );
     }
 
-    pub inline fn swapChainGetCurrentTextureView(swap_chain: *gpu.SwapChain) *gpu.TextureView {
-        return @ptrCast(*gpu.TextureView, procs.swapChainGetCurrentTextureView.?(@ptrCast(c.WGPUSwapChain, swap_chain)));
+    pub inline fn swapChainGetCurrentTextureView(swap_chain: *gpu.SwapChain) ?*gpu.TextureView {
+        return @ptrCast(?*gpu.TextureView, procs.swapChainGetCurrentTextureView.?(@ptrCast(c.WGPUSwapChain, swap_chain)));
     }
 
     pub inline fn swapChainPresent(swap_chain: *gpu.SwapChain) void {
diff --git a/libs/gpu/src/interface.zig b/libs/gpu/src/interface.zig
index ac665bd0..68621546 100644
--- a/libs/gpu/src/interface.zig
+++ b/libs/gpu/src/interface.zig
@@ -196,7 +196,7 @@ pub fn Interface(comptime T: type) type {
     assertDecl(T, "surfaceReference", fn (surface: *gpu.Surface) callconv(.Inline) void);
     assertDecl(T, "surfaceRelease", fn (surface: *gpu.Surface) callconv(.Inline) void);
     assertDecl(T, "swapChainConfigure", fn (swap_chain: *gpu.SwapChain, format: gpu.Texture.Format, allowed_usage: gpu.Texture.UsageFlags, width: u32, height: u32) callconv(.Inline) void);
-    assertDecl(T, "swapChainGetCurrentTextureView", fn (swap_chain: *gpu.SwapChain) callconv(.Inline) *gpu.TextureView);
+    assertDecl(T, "swapChainGetCurrentTextureView", fn (swap_chain: *gpu.SwapChain) callconv(.Inline) ?*gpu.TextureView);
     assertDecl(T, "swapChainPresent", fn (swap_chain: *gpu.SwapChain) callconv(.Inline) void);
     assertDecl(T, "swapChainReference", fn (swap_chain: *gpu.SwapChain) callconv(.Inline) void);
     assertDecl(T, "swapChainRelease", fn (swap_chain: *gpu.SwapChain) callconv(.Inline) void);
@@ -1118,7 +1118,7 @@ pub fn Export(comptime T: type) type {
         }
 
         // WGPU_EXPORT WGPUTextureView wgpuSwapChainGetCurrentTextureView(WGPUSwapChain swapChain);
-        export fn wgpuSwapChainGetCurrentTextureView(swap_chain: *gpu.SwapChain) *gpu.TextureView {
+        export fn wgpuSwapChainGetCurrentTextureView(swap_chain: *gpu.SwapChain) ?*gpu.TextureView {
             return T.swapChainGetCurrentTextureView(swap_chain);
         }
 
@@ -2342,7 +2342,7 @@ pub const StubInterface = Interface(struct {
         unreachable;
     }
 
-    pub inline fn swapChainGetCurrentTextureView(swap_chain: *gpu.SwapChain) *gpu.TextureView {
+    pub inline fn swapChainGetCurrentTextureView(swap_chain: *gpu.SwapChain) ?*gpu.TextureView {
         _ = swap_chain;
         unreachable;
     }
diff --git a/libs/gpu/src/swap_chain.zig b/libs/gpu/src/swap_chain.zig
index 21e2c3ce..93e24129 100644
--- a/libs/gpu/src/swap_chain.zig
+++ b/libs/gpu/src/swap_chain.zig
@@ -21,7 +21,7 @@ pub const SwapChain = opaque {
         Impl.swapChainConfigure(swap_chain, format, allowed_usage, width, height);
     }
 
-    pub inline fn getCurrentTextureView(swap_chain: *SwapChain) *TextureView {
+    pub inline fn getCurrentTextureView(swap_chain: *SwapChain) ?*TextureView {
         return Impl.swapChainGetCurrentTextureView(swap_chain);
     }
 
diff --git a/shaderexp/main.zig b/shaderexp/main.zig
index cdf75cc0..978b5b0e 100755
--- a/shaderexp/main.zig
+++ b/shaderexp/main.zig
@@ -117,7 +117,7 @@ pub fn update(app: *App) !bool {
         std.log.err("Something went wrong when attempting to stat file: {}\n", .{err});
     }
 
-    const back_buffer_view = app.core.swapChain().getCurrentTextureView();
+    const back_buffer_view = app.core.swapChain().getCurrentTextureView().?;
     const color_attachment = gpu.RenderPassColorAttachment{
         .view = back_buffer_view,
         .clear_value = std.mem.zeroes(gpu.Color),