Add Chromium-only Blender WebEngine parity work

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

@@ -0,0 +1,75 @@
+/* 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"
+
+CCL_NAMESPACE_BEGIN
+
+/* Gradient */
+
+ccl_device float svm_gradient(const float3 p, NodeGradientType type)
+{
+  float x;
+  float y;
+  float z;
+
+  x = p.x;
+  y = p.y;
+  z = p.z;
+
+  if (type == NODE_BLEND_LINEAR) {
+    return x;
+  }
+  if (type == NODE_BLEND_QUADRATIC) {
+    const float r = fmaxf(x, 0.0f);
+    return r * r;
+  }
+  if (type == NODE_BLEND_EASING) {
+    const float r = fminf(fmaxf(x, 0.0f), 1.0f);
+    const float t = r * r;
+
+    return (3.0f * t - 2.0f * t * r);
+  }
+  if (type == NODE_BLEND_DIAGONAL) {
+    return (x + y) * 0.5f;
+  }
+  if (type == NODE_BLEND_RADIAL) {
+    return atan2f(y, x) / M_2PI_F + 0.5f;
+  }
+
+  /* Bias a little bit for the case where p is a unit length vector,
+   * to get exactly zero instead of a small random value depending
+   * on float precision. */
+  const float r = fmaxf(0.999999f - sqrtf(x * x + y * y + z * z), 0.0f);
+
+  if (type == NODE_BLEND_QUADRATIC_SPHERE) {
+    return r * r;
+  }
+  if (type == NODE_BLEND_SPHERICAL) {
+    return r;
+  }
+
+  return 0.0f;
+}
+
+ccl_device_noinline void svm_node_tex_gradient(
+    ccl_private float *ccl_restrict stack, const ccl_global SVMNodeTexGradient &ccl_restrict node)
+{
+  const float3 co = stack_load_float3(stack, node.co);
+
+  float f = svm_gradient(co, node.gradient_type);
+  f = saturatef(f);
+
+  if (stack_valid(node.fac_offset)) {
+    stack_store_float(stack, node.fac_offset, f);
+  }
+  if (stack_valid(node.color_offset)) {
+    stack_store_float3(stack, node.color_offset, make_float3(f, f, f));
+  }
+}
+
+CCL_NAMESPACE_END