gpu: implement Device.createSampler

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

gpu/src/Device.zig

@@ -23,6 +23,7 @@ const ExternalTexture = @import("ExternalTexture.zig");
 const PipelineLayout = @import("PipelineLayout.zig");
 const QuerySet = @import("QuerySet.zig");
 const RenderBundleEncoder = @import("RenderBundleEncoder.zig");
+const Sampler = @import("Sampler.zig");
 
 const Device = @This();
 
@@ -55,8 +56,7 @@ pub const VTable = struct {
         descriptor: *const RenderPipeline.Descriptor,
         callback: *RenderPipeline.CreateCallback,
     ) void,
-    // createSampler: fn (ptr: *anyopaque, descriptor: *const Sampler.Descriptor) Sampler,
-    // WGPU_EXPORT WGPUSampler wgpuDeviceCreateSampler(WGPUDevice device, WGPUSamplerDescriptor const * descriptor);
+    createSampler: fn (ptr: *anyopaque, descriptor: *const Sampler.Descriptor) Sampler,
     createShaderModule: fn (ptr: *anyopaque, descriptor: *const ShaderModule.Descriptor) ShaderModule,
     nativeCreateSwapChain: fn (ptr: *anyopaque, surface: ?Surface, descriptor: *const SwapChain.Descriptor) SwapChain,
     // createTexture: fn (ptr: *anyopaque, descriptor: *const Texture.Descriptor) Texture,
@@ -113,6 +113,10 @@ pub inline fn createBindGroupLayout(device: Device, descriptor: *const BindGroup
     return device.vtable.createBindGroupLayout(device.ptr, descriptor);
 }
 
+pub inline fn createSampler(device: Device, descriptor: *const Sampler.Descriptor) Sampler {
+    return device.vtable.createSampler(device.ptr, descriptor);
+}
+
 pub inline fn createShaderModule(device: Device, descriptor: *const ShaderModule.Descriptor) ShaderModule {
     return device.vtable.createShaderModule(device.ptr, descriptor);
 }
@@ -203,6 +207,7 @@ test {
     _ = injectError;
     _ = createBindGroup;
     _ = createBindGroupLayout;
+    _ = createSampler;
     _ = createShaderModule;
     _ = nativeCreateSwapChain;
     _ = destroy;

gpu/src/NativeInstance.zig

@@ -382,6 +382,14 @@ const device_vtable = Device.VTable{
             return wrapBindGroupLayout(c.wgpuDeviceCreateBindGroupLayout(@ptrCast(c.WGPUDevice, ptr), &desc));
         }
     }).createBindGroupLayout,
+    .createSampler = (struct {
+        pub fn createSampler(ptr: *anyopaque, descriptor: *const Sampler.Descriptor) Sampler {
+            return wrapSampler(c.wgpuDeviceCreateSampler(
+                @ptrCast(c.WGPUDevice, ptr),
+                @ptrCast(*const c.WGPUSamplerDescriptor, descriptor),
+            ));
+        }
+    }).createSampler,
     .createShaderModule = (struct {
         pub fn createShaderModule(ptr: *anyopaque, descriptor: *const ShaderModule.Descriptor) ShaderModule {
             switch (descriptor.code) {

gpu/src/Sampler.zig

@@ -39,7 +39,8 @@ pub const BindingLayout = extern struct {
     type: BindingType,
 };
 
-pub const Descriptor = struct {
+pub const Descriptor = extern struct {
+    reserved: ?*anyopaque = null,
     label: ?[*:0]const u8 = null,
     address_mode_u: AddressMode,
     address_mode_v: AddressMode,