Initial support for oneAPI Level Zero

Change-Id: I221df8427b1844237a4d9d900c58512706b0be0f

level_zero/core/source/sampler.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2019-2020 Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#pragma once
+
+#include "level_zero/core/source/device.h"
+#include <level_zero/ze_sampler.h>
+
+struct _ze_sampler_handle_t {};
+
+namespace L0 {
+
+struct Sampler : _ze_sampler_handle_t {
+    template <typename Type>
+    struct Allocator {
+        static Sampler *allocate() { return new Type(); }
+    };
+
+    virtual ~Sampler() = default;
+    virtual ze_result_t destroy() = 0;
+
+    static Sampler *create(uint32_t productFamily, Device *device,
+                           const ze_sampler_desc_t *desc);
+
+    virtual void copySamplerStateToDSH(void *dynamicStateHeap,
+                                       const uint32_t dynamicStateHeapSize,
+                                       const uint32_t heapOffset) = 0;
+
+    static Sampler *fromHandle(ze_sampler_handle_t handle) {
+        return static_cast<Sampler *>(handle);
+    }
+
+    inline ze_sampler_handle_t toHandle() { return this; }
+};
+
+using SamplerAllocatorFn = Sampler *(*)();
+extern SamplerAllocatorFn samplerFactory[];
+
+template <uint32_t productFamily, typename SamplerType>
+struct SamplerPopulateFactory {
+    SamplerPopulateFactory() {
+        samplerFactory[productFamily] =
+            Sampler::Allocator<SamplerType>::allocate;
+    }
+};
+
+} // namespace L0