1 files changed, 61 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/checker.h b/intern/cycles/kernel/svm/checker.h
new file mode 100644
index 00000000000..a79b1651f44
--- /dev/null
+++ b/intern/cycles/kernel/svm/checker.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2011-2013 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.
+ */
+
+#pragma once
+
+CCL_NAMESPACE_BEGIN
+
+/* Checker */
+
+ccl_device float svm_checker(float3 p)
+{
+  /* avoid precision issues on unit coordinates */
+  p.x = (p.x + 0.000001f) * 0.999999f;
+  p.y = (p.y + 0.000001f) * 0.999999f;
+  p.z = (p.z + 0.000001f) * 0.999999f;
+
+  int xi = abs(float_to_int(floorf(p.x)));
+  int yi = abs(float_to_int(floorf(p.y)));
+  int zi = abs(float_to_int(floorf(p.z)));
+
+  return ((xi % 2 == yi % 2) == (zi % 2)) ? 1.0f : 0.0f;
+}
+
+ccl_device_noinline void svm_node_tex_checker(KernelGlobals kg,
+                                              ccl_private ShaderData *sd,
+                                              ccl_private float *stack,
+                                              uint4 node)
+{
+  uint co_offset, color1_offset, color2_offset, scale_offset;
+  uint color_offset, fac_offset;
+
+  svm_unpack_node_uchar4(node.y, &co_offset, &color1_offset, &color2_offset, &scale_offset);
+  svm_unpack_node_uchar2(node.z, &color_offset, &fac_offset);
+
+  float3 co = stack_load_float3(stack, co_offset);
+  float3 color1 = stack_load_float3(stack, color1_offset);
+  float3 color2 = stack_load_float3(stack, color2_offset);
+  float scale = stack_load_float_default(stack, scale_offset, node.w);
+
+  float f = svm_checker(co * scale);
+
+  if (stack_valid(color_offset))
+    stack_store_float3(stack, color_offset, (f == 1.0f) ? color1 : color2);
+  if (stack_valid(fac_offset))
+    stack_store_float(stack, fac_offset, f);
+}
+
+CCL_NAMESPACE_END