Cycles: checker texture node, patch by Thomas.

intern/cycles/kernel/CMakeLists.txt

@@ -57,6 +57,7 @@ set(SRC_SVM_HEADERS
 	svm/svm_camera.h
 	svm/svm_closure.h
 	svm/svm_convert.h
+	svm/svm_checker.h
 	svm/svm_displace.h
 	svm/svm_fresnel.h
 	svm/svm_gamma.h

intern/cycles/kernel/svm/svm.h

@@ -145,6 +145,7 @@ CCL_NAMESPACE_END
 #include "svm_tex_coord.h"
 #include "svm_value.h"
 #include "svm_voronoi.h"
+#include "svm_checker.h"
 
 CCL_NAMESPACE_BEGIN
 
@@ -235,6 +236,9 @@ __device_noinline void svm_eval_nodes(KernelGlobals *kg, ShaderData *sd, ShaderT
 			case NODE_TEX_MAGIC:
 				svm_node_tex_magic(kg, sd, stack, node, &offset);
 				break;
+			case NODE_TEX_CHECKER:
+				svm_node_tex_checker(kg, sd, stack, node, &offset);
+				break;
 #endif
 			case NODE_CAMERA:
 				svm_node_camera(kg, sd, stack, node.y, node.z, node.w);

intern/cycles/kernel/svm/svm_checker.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+CCL_NAMESPACE_BEGIN
+
+/* Checker */
+
+__device_noinline float svm_checker(float3 p, float scale)
+{	
+	p *= scale;
+
+	/* 0.00001  because of unit sized stuff */
+	int xi = (int)fabsf(floor(0.00001f + p.x));
+	int yi = (int)fabsf(floor(0.00001f + p.y));
+	int zi = (int)fabsf(floor(0.00001f + p.z));
+	
+	return ((xi % 2 == yi % 2) == (zi % 2))? 1.0f: 0.0f;
+}
+
+__device void svm_node_tex_checker(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
+{	
+	uint co_offset, color1_offset, color2_offset, scale_offset;
+	uint color_offset, fac_offset;
+
+	decode_node_uchar4(node.y, &co_offset, &color1_offset, &color2_offset, &scale_offset);
+	decode_node_uchar4(node.z, &color_offset, &fac_offset, NULL, NULL);
+
+	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
+

intern/cycles/kernel/svm/svm_types.h

@@ -86,7 +86,8 @@ typedef enum NodeType {
 	NODE_CAMERA = 5300,
 	NODE_INVERT = 5400,
 	NODE_NORMAL = 5500,
-	NODE_GAMMA = 5600
+	NODE_GAMMA = 5600,
+	NODE_TEX_CHECKER = 5700
 } NodeType;
 
 typedef enum NodeAttributeType {