1 files changed, 80 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/svm_gradient.h b/intern/cycles/kernel/svm/svm_gradient.h
new file mode 100644
index 00000000000..c7013800d6b
--- /dev/null
+++ b/intern/cycles/kernel/svm/svm_gradient.h
@@ -0,0 +1,80 @@
+/*
+ * 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
+
+/* Gradient */
+
+__device float svm_gradient(float3 p, NodeBlendType type)
+{
+	float x, y, z;
+
+	x= p.x;
+	y= p.y;
+	z= p.z;
+
+	if(type == NODE_BLEND_LINEAR) {
+		return x;
+	}
+	else if(type == NODE_BLEND_QUADRATIC) {
+		float r = fmaxf(x, 0.0f);
+		return r*r;
+	}
+	else if(type == NODE_BLEND_EASING) {
+		float r = fminf(fmaxf(x, 0.0f), 1.0f);
+		float t = r*r;
+		
+		return (3.0f*t - 2.0f*t*r);
+	}
+	else if(type == NODE_BLEND_DIAGONAL) {
+		return (x + y)/2.0f;
+	}
+	else if(type == NODE_BLEND_RADIAL) {
+		return atan2(y, x)/(2.0f*M_PI_F) + 0.5f;
+	}
+	else {
+		float r = fmaxf(1.0f - sqrtf(x*x + y*y + z*z), 0.0f);
+
+		if(type == NODE_BLEND_QUADRATIC_SPHERE)
+			return r*r;
+		else if(type == NODE_BLEND_SPHERICAL)
+			return r;
+	}
+
+	return 0.0f;
+}
+
+__device void svm_node_tex_gradient(ShaderData *sd, float *stack, uint4 node)
+{
+	uint type, co_offset, color_offset, fac_offset;
+
+	decode_node_uchar4(node.y, &type, &co_offset, &fac_offset, &color_offset);
+
+	float3 co = stack_load_float3(stack, co_offset);
+
+	float f = svm_gradient(co, (NodeBlendType)type);
+	f = clamp(f, 0.0f, 1.0f);
+
+	if(stack_valid(fac_offset))
+		stack_store_float(stack, fac_offset, f);
+	if(stack_valid(color_offset))
+		stack_store_float3(stack, color_offset, make_float3(f, f, f));
+}
+
+CCL_NAMESPACE_END
+