From 13b4a93a87ec375ff831f535ec8e20ddbef1128d Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Wed, 9 Mar 2022 11:38:41 -0700
Subject: [PATCH] gpu: implement TextureView

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 gpu/src/NativeInstance.zig | 22 ++++++++++++++++++++++
 gpu/src/TextureView.zig    | 21 +++++++++++++++++++++
 gpu/src/main.zig           |  2 ++
 3 files changed, 45 insertions(+)
 create mode 100644 gpu/src/TextureView.zig

diff --git a/gpu/src/NativeInstance.zig b/gpu/src/NativeInstance.zig
index 4f070f6a..6d2aaefc 100644
--- a/gpu/src/NativeInstance.zig
+++ b/gpu/src/NativeInstance.zig
@@ -20,6 +20,7 @@ const Queue = @import("Queue.zig");
 const CommandBuffer = @import("CommandBuffer.zig");
 const ShaderModule = @import("ShaderModule.zig");
 const SwapChain = @import("SwapChain.zig");
+const TextureView = @import("TextureView.zig");
 
 const TextureUsage = @import("enums.zig").TextureUsage;
 const TextureFormat = @import("enums.zig").TextureFormat;
@@ -497,6 +498,26 @@ const swap_chain_vtable = SwapChain.VTable{
     }).configure,
 };
 
+fn wrapTextureView(texture_view: c.WGPUTextureView) TextureView {
+    return .{
+        .ptr = texture_view.?,
+        .vtable = &texture_view_vtable,
+    };
+}
+
+const texture_view_vtable = TextureView.VTable{
+    .reference = (struct {
+        pub fn reference(ptr: *anyopaque) void {
+            c.wgpuTextureViewReference(@ptrCast(c.WGPUTextureView, ptr));
+        }
+    }).reference,
+    .release = (struct {
+        pub fn release(ptr: *anyopaque) void {
+            c.wgpuTextureViewRelease(@ptrCast(c.WGPUTextureView, ptr));
+        }
+    }).release,
+};
+
 test "syntax" {
     _ = wrap;
     _ = interface_vtable;
@@ -510,4 +531,5 @@ test "syntax" {
     _ = wrapQueue;
     _ = wrapShaderModule;
     _ = wrapSwapChain;
+    _ = wrapTextureView;
 }
diff --git a/gpu/src/TextureView.zig b/gpu/src/TextureView.zig
new file mode 100644
index 00000000..1b73039c
--- /dev/null
+++ b/gpu/src/TextureView.zig
@@ -0,0 +1,21 @@
+const TextureView = @This();
+
+/// The type erased pointer to the TextureView implementation
+/// Equal to c.WGPUTextureView for NativeInstance.
+ptr: *anyopaque,
+vtable: *const VTable,
+
+pub const VTable = struct {
+    reference: fn (ptr: *anyopaque) void,
+    release: fn (ptr: *anyopaque) void,
+    // TODO:
+    // WGPU_EXPORT void wgpuTextureViewSetLabel(WGPUTextureView textureView, char const * label);
+};
+
+pub inline fn reference(texture_view: TextureView) void {
+    texture_view.vtable.reference(texture_view.ptr);
+}
+
+pub inline fn release(texture_view: TextureView) void {
+    texture_view.vtable.release(texture_view.ptr);
+}
diff --git a/gpu/src/main.zig b/gpu/src/main.zig
index 256bb2f0..20afd067 100644
--- a/gpu/src/main.zig
+++ b/gpu/src/main.zig
@@ -35,6 +35,7 @@ pub const Queue = @import("Queue.zig");
 pub const CommandBuffer = @import("CommandBuffer.zig");
 pub const ShaderModule = @import("ShaderModule.zig");
 pub const SwapChain = @import("SwapChain.zig");
+pub const TextureView = @import("TextureView.zig");
 
 pub const Feature = @import("enums.zig").Feature;
 pub const TextureUsage = @import("enums.zig").TextureUsage;
@@ -94,6 +95,7 @@ test "syntax" {
     _ = CommandBuffer;
     _ = ShaderModule;
     _ = SwapChain;
+    _ = TextureView;
 
     _ = Feature;
 }