1 files changed, 79 insertions, 0 deletions

diff --git a/intern/cycles/kernel/device/metal/context_begin.h b/intern/cycles/kernel/device/metal/context_begin.h
new file mode 100644
index 00000000000..3b5fcdd1f7f
--- /dev/null
+++ b/intern/cycles/kernel/device/metal/context_begin.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2021 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// clang-format off
+
+/* Open the Metal kernel context class
+ * Necessary to access resource bindings */
+class MetalKernelContext {
+  public:
+    constant KernelParamsMetal &launch_params_metal;
+    constant MetalAncillaries *metal_ancillaries;
+
+    MetalKernelContext(constant KernelParamsMetal &_launch_params_metal, constant MetalAncillaries * _metal_ancillaries)
+    : launch_params_metal(_launch_params_metal), metal_ancillaries(_metal_ancillaries)
+    {}
+
+    /* texture fetch adapter functions */
+    typedef uint64_t ccl_gpu_tex_object;
+
+    template<typename T>
+    inline __attribute__((__always_inline__))
+    T ccl_gpu_tex_object_read_2D(ccl_gpu_tex_object tex, float x, float y) const {
+      kernel_assert(0);
+      return 0;
+    }
+    template<typename T>
+    inline __attribute__((__always_inline__))
+    T ccl_gpu_tex_object_read_3D(ccl_gpu_tex_object tex, float x, float y, float z) const {
+      kernel_assert(0);
+      return 0;
+    }
+
+    // texture2d
+    template<>
+    inline __attribute__((__always_inline__))
+    float4 ccl_gpu_tex_object_read_2D(ccl_gpu_tex_object tex, float x, float y) const {
+      const uint tid(tex);
+      const uint sid(tex >> 32);
+      return metal_ancillaries->textures_2d[tid].tex.sample(metal_samplers[sid], float2(x, y));
+    }
+    template<>
+    inline __attribute__((__always_inline__))
+    float ccl_gpu_tex_object_read_2D(ccl_gpu_tex_object tex, float x, float y) const {
+      const uint tid(tex);
+      const uint sid(tex >> 32);
+      return metal_ancillaries->textures_2d[tid].tex.sample(metal_samplers[sid], float2(x, y)).x;
+    }
+
+    // texture3d
+    template<>
+    inline __attribute__((__always_inline__))
+    float4 ccl_gpu_tex_object_read_3D(ccl_gpu_tex_object tex, float x, float y, float z) const {
+      const uint tid(tex);
+      const uint sid(tex >> 32);
+      return metal_ancillaries->textures_3d[tid].tex.sample(metal_samplers[sid], float3(x, y, z));
+    }
+    template<>
+    inline __attribute__((__always_inline__))
+    float ccl_gpu_tex_object_read_3D(ccl_gpu_tex_object tex, float x, float y, float z) const {
+      const uint tid(tex);
+      const uint sid(tex >> 32);
+      return metal_ancillaries->textures_3d[tid].tex.sample(metal_samplers[sid], float3(x, y, z)).x;
+    }
+#    include "kernel/device/gpu/image.h"
+
+  // clang-format on
\ No newline at end of file