Cycles: add ColorRamp node.

1 files changed, 74 insertions, 0 deletions

diff --git a/intern/cycles/kernel/svm/svm_ramp.h b/intern/cycles/kernel/svm/svm_ramp.h
new file mode 100644
index 00000000000..0654240c21b
--- /dev/null
+++ b/intern/cycles/kernel/svm/svm_ramp.h
@@ -0,0 +1,74 @@
+/*
+ * 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.
+ */
+
+#ifndef __SVM_RAMP_H__
+#define __SVM_RAMP_H__
+
+CCL_NAMESPACE_BEGIN
+
+__device float4 rgb_ramp_lookup(KernelGlobals *kg, int offset, float f)
+{
+	f = clamp(f, 0.0f, 1.0f)*(RAMP_TABLE_SIZE-1);
+
+	int i = (int)f;
+	float t = f - (float)i;
+
+	float4 a = fetch_node_float(kg, offset+i);
+
+	if(t > 0.0f)
+		a = (1.0f - t)*a + t*fetch_node_float(kg, offset+i+1);
+
+	return a;
+}
+
+__device void svm_node_rgb_ramp(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
+{
+	uint fac_offset = node.y;
+	uint color_offset = node.z;
+
+	float fac = stack_load_float(stack, fac_offset);
+	float4 color = rgb_ramp_lookup(kg, *offset, fac);
+
+	stack_store_float3(stack, color_offset, float4_to_float3(color));
+
+	*offset += RAMP_TABLE_SIZE;
+}
+
+__device void svm_node_rgb_curves(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
+{
+	uint fac_offset = node.y;
+	uint color_offset = node.z;
+	uint out_offset = node.w;
+
+	float fac = stack_load_float(stack, fac_offset);
+	float3 color = stack_load_float3(stack, color_offset);
+
+	float r = rgb_ramp_lookup(kg, *offset, rgb_ramp_lookup(kg, *offset, color.x).w).x;
+	float g = rgb_ramp_lookup(kg, *offset, rgb_ramp_lookup(kg, *offset, color.y).w).y;
+	float b = rgb_ramp_lookup(kg, *offset, rgb_ramp_lookup(kg, *offset, color.z).w).z;
+
+	color = (1.0f - fac)*color + fac*make_float3(r, g, b);
+	stack_store_float3(stack, out_offset, color);
+
+	*offset += RAMP_TABLE_SIZE;
+}
+
+CCL_NAMESPACE_END
+
+#endif /* __SVM_RAMP_H__ */
+