Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/kernel/svm/ies.h

@@ -0,0 +1,33 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#include "kernel/svm/node_types.h"
+#include "kernel/svm/util.h"
+
+#include "kernel/util/ies.h"
+
+CCL_NAMESPACE_BEGIN
+
+ccl_device_noinline void svm_node_ies(KernelGlobals kg,
+                                      ccl_private ShaderData * /*sd*/,
+                                      ccl_private float *stack,
+                                      const ccl_global SVMNodeIES &ccl_restrict node)
+{
+  float3 vector = stack_load_float3(stack, node.vector_offset);
+  const float strength = stack_load(stack, node.strength);
+
+  vector = normalize(vector);
+  const float v_angle = safe_acosf(-vector.z);
+  const float h_angle = atan2f(vector.x, vector.y) + M_PI_F;
+
+  const float fac = strength * kernel_ies_interp(kg, node.slot, h_angle, v_angle);
+
+  if (stack_valid(node.fac_offset)) {
+    stack_store_float(stack, node.fac_offset, fac);
+  }
+}
+
+CCL_NAMESPACE_END