Add Chromium-only Blender WebEngine parity work

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

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+/* SPDX-FileCopyrightText: 2009-2010 Sony Pictures Imageworks Inc., et al. All Rights Reserved.
+ * SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Adapted code from Open Shading Language. */
+
+#pragma once
+
+#include "kernel/globals.h"
+
+#include "kernel/svm/math_util.h"
+#include "kernel/svm/node_types.h"
+#include "kernel/svm/util.h"
+
+#include "kernel/util/colorspace.h"
+
+CCL_NAMESPACE_BEGIN
+
+/* Blackbody Node */
+
+ccl_device_noinline void svm_node_blackbody(KernelGlobals kg,
+                                            ccl_private float *ccl_restrict stack,
+                                            const ccl_global SVMNodeBlackbody &ccl_restrict node)
+{
+  /* Input */
+  const float temperature = stack_load(stack, node.temperature);
+
+  float3 color_rgb = rec709_to_rgb(kg, svm_math_blackbody_color_rec709(temperature));
+  color_rgb = max(color_rgb, zero_float3());
+
+  stack_store_float3(stack, node.color_offset, color_rgb);
+}
+
+CCL_NAMESPACE_END