gpu: implement Sampler

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

gpu/src/NativeInstance.zig

@@ -22,6 +22,7 @@ const ShaderModule = @import("ShaderModule.zig");
 const SwapChain = @import("SwapChain.zig");
 const TextureView = @import("TextureView.zig");
 const Texture = @import("Texture.zig");
+const Sampler = @import("Sampler.zig");
 
 const TextureUsage = @import("enums.zig").TextureUsage;
 const TextureFormat = @import("enums.zig").TextureFormat;
@@ -539,6 +540,26 @@ const texture_vtable = Texture.VTable{
     }).release,
 };
 
+fn wrapSampler(sampler: c.WGPUSampler) Sampler {
+    return .{
+        .ptr = sampler.?,
+        .vtable = &sampler_vtable,
+    };
+}
+
+const sampler_vtable = Sampler.VTable{
+    .reference = (struct {
+        pub fn reference(ptr: *anyopaque) void {
+            c.wgpuSamplerReference(@ptrCast(c.WGPUSampler, ptr));
+        }
+    }).reference,
+    .release = (struct {
+        pub fn release(ptr: *anyopaque) void {
+            c.wgpuSamplerRelease(@ptrCast(c.WGPUSampler, ptr));
+        }
+    }).release,
+};
+
 test "syntax" {
     _ = wrap;
     _ = interface_vtable;
@@ -554,4 +575,5 @@ test "syntax" {
     _ = wrapSwapChain;
     _ = wrapTextureView;
     _ = wrapTexture;
+    _ = wrapSampler;
 }

gpu/src/Sampler.zig

@@ -0,0 +1,27 @@
+const Sampler = @This();
+
+/// The type erased pointer to the Sampler implementation
+/// Equal to c.WGPUSampler 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 wgpuSamplerSetLabel(WGPUSampler sampler, char const * label);
+};
+
+pub inline fn reference(sampler: Sampler) void {
+    sampler.vtable.reference(sampler.ptr);
+}
+
+pub inline fn release(sampler: Sampler) void {
+    sampler.vtable.release(sampler.ptr);
+}
+
+test "syntax" {
+    _ = VTable;
+    _ = reference;
+    _ = release;
+}

gpu/src/Texture.zig

@@ -21,3 +21,9 @@ pub inline fn reference(texture: Texture) void {
 pub inline fn release(texture: Texture) void {
     texture.vtable.release(texture.ptr);
 }
+
+test "syntax" {
+    _ = VTable;
+    _ = reference;
+    _ = release;
+}

gpu/src/TextureView.zig

@@ -19,3 +19,9 @@ pub inline fn reference(texture_view: TextureView) void {
 pub inline fn release(texture_view: TextureView) void {
     texture_view.vtable.release(texture_view.ptr);
 }
+
+test "syntax" {
+    _ = VTable;
+    _ = reference;
+    _ = release;
+}

gpu/src/main.zig

@@ -37,6 +37,7 @@ pub const ShaderModule = @import("ShaderModule.zig");
 pub const SwapChain = @import("SwapChain.zig");
 pub const TextureView = @import("TextureView.zig");
 pub const Texture = @import("Texture.zig");
+pub const Sampler = @import("Sampler.zig");
 
 pub const Feature = @import("enums.zig").Feature;
 pub const TextureUsage = @import("enums.zig").TextureUsage;
@@ -98,6 +99,7 @@ test "syntax" {
     _ = SwapChain;
     _ = TextureView;
     _ = Texture;
+    _ = Sampler;
 
     _ = Feature;
 }