Cycles: add ColorRamp node.

intern/cycles/blender/blender_shader.cpp

@@ -105,7 +105,6 @@ static ShaderNode *add_node(BL::BlendData b_data, ShaderGraph *graph, BL::Shader
 
 	switch(b_node.type()) {
 		/* not supported */
-		case BL::ShaderNode::type_CURVE_RGB: break;
 		case BL::ShaderNode::type_CURVE_VEC: break;
 		case BL::ShaderNode::type_GEOMETRY: break;
 		case BL::ShaderNode::type_MATERIAL: break;
@@ -114,10 +113,21 @@ static ShaderNode *add_node(BL::BlendData b_data, ShaderGraph *graph, BL::Shader
 		case BL::ShaderNode::type_SCRIPT: break;
 		case BL::ShaderNode::type_SQUEEZE: break;
 		case BL::ShaderNode::type_TEXTURE: break;
-		case BL::ShaderNode::type_VALTORGB: break;
 		/* handled outside this function */
 		case BL::ShaderNode::type_GROUP: break;
 		/* existing blender nodes */
+		case BL::ShaderNode::type_CURVE_RGB: {
+			RGBCurvesNode *ramp = new RGBCurvesNode();
+			node = ramp;
+			break;
+		}
+		case BL::ShaderNode::type_VALTORGB: {
+			RGBRampNode *ramp = new RGBRampNode();
+			BL::ShaderNodeValToRGB b_ramp_node(b_node);
+			colorramp_to_array(b_ramp_node.color_ramp(), ramp->ramp, RAMP_TABLE_SIZE);
+			node = ramp;
+			break;
+		}
 		case BL::ShaderNode::type_RGB: {
 			ColorNode *color = new ColorNode();
 			color->value = get_node_output_rgba(b_node, "Color");

intern/cycles/blender/blender_util.h

@@ -50,6 +50,7 @@ void engine_tag_redraw(void *engine);
 void engine_tag_update(void *engine);
 int rna_Object_is_modified(void *ob, void *scene, int settings);
 void BLI_timestr(double _time, char *str);
+void rna_ColorRamp_eval(void *coba, float position, float color[4]);
 
 }
 
@@ -63,6 +64,16 @@ static inline BL::Mesh object_to_mesh(BL::Object self, BL::Scene scene, bool app
 	return BL::Mesh(ptr);
 }
 
+static inline void colorramp_to_array(BL::ColorRamp ramp, float4 *data, int size)
+{
+	for(int i = 0; i < size; i++) {
+		float color[4];
+
+		rna_ColorRamp_eval(ramp.ptr.data, i/(float)(size-1), color);
+		data[i] = make_float4(color[0], color[1], color[2], color[3]);
+	}
+}
+
 static inline void object_remove_mesh(BL::BlendData data, BL::Mesh mesh)
 {
 	rna_Main_meshes_remove(data.ptr.data, NULL, mesh.ptr.data);

intern/cycles/kernel/CMakeLists.txt

@@ -78,6 +78,7 @@ set(SRC_SVM_HEADERS
 	svm/svm_noise.h
 	svm/svm_noisetex.h
 	svm/svm_normal.h
+	svm/svm_ramp.h
 	svm/svm_sepcomb_rgb.h
 	svm/svm_sky.h
 	svm/svm_tex_coord.h

intern/cycles/kernel/kernel_types.h

@@ -29,6 +29,7 @@ CCL_NAMESPACE_BEGIN
 #define OBJECT_SIZE 		16
 #define LIGHT_SIZE			4
 #define FILTER_TABLE_SIZE	256
+#define RAMP_TABLE_SIZE		256
 
 /* device capabilities */
 #ifdef __KERNEL_CPU__

intern/cycles/kernel/svm/svm.h

@@ -104,6 +104,12 @@ __device_inline float4 read_node_float(KernelGlobals *kg, int *offset)
 	return f;
 }
 
+__device_inline float4 fetch_node_float(KernelGlobals *kg, int offset)
+{
+	uint4 node = kernel_tex_fetch(__svm_nodes, offset);
+	return make_float4(__int_as_float(node.x), __int_as_float(node.y), __int_as_float(node.z), __int_as_float(node.w));
+}
+
 __device_inline void decode_node_uchar4(uint i, uint *x, uint *y, uint *z, uint *w)
 {
 	if(x) *x = (i & 0xFF);
@@ -140,6 +146,7 @@ CCL_NAMESPACE_END
 #include "svm_wave.h"
 #include "svm_math.h"
 #include "svm_mix.h"
+#include "svm_ramp.h"
 #include "svm_sepcomb_rgb.h"
 #include "svm_musgrave.h"
 #include "svm_sky.h"
@@ -331,6 +338,12 @@ __device_noinline void svm_eval_nodes(KernelGlobals *kg, ShaderData *sd, ShaderT
 			case NODE_EMISSION_SET_WEIGHT_TOTAL:
 				svm_node_emission_set_weight_total(kg, sd, node.y, node.z, node.w);
 				break;
+			case NODE_RGB_RAMP:
+				svm_node_rgb_ramp(kg, sd, stack, node, &offset);
+				break;
+			case NODE_RGB_CURVES:
+				svm_node_rgb_curves(kg, sd, stack, node, &offset);
+				break;
 			case NODE_END:
 			default:
 #ifndef __MULTI_CLOSURE__

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__ */
+

intern/cycles/kernel/svm/svm_types.h

@@ -88,7 +88,9 @@ typedef enum NodeType {
 	NODE_NORMAL = 5500,
 	NODE_GAMMA = 5600,
 	NODE_TEX_CHECKER = 5700,
-	NODE_BRIGHTCONTRAST = 5800
+	NODE_BRIGHTCONTRAST = 5800,
+	NODE_RGB_RAMP = 5900,
+	NODE_RGB_CURVES = 6000
 } NodeType;
 
 typedef enum NodeAttributeType {

intern/cycles/render/nodes.cpp

@@ -2352,5 +2352,60 @@ void BumpNode::compile(OSLCompiler& compiler)
 	compiler.add(this, "node_bump");
 }
 
+/* RGBCurvesNode */
+
+RGBCurvesNode::RGBCurvesNode()
+: ShaderNode("rgb_curves")
+{
+	add_input("Fac", SHADER_SOCKET_FLOAT);
+	add_input("Color", SHADER_SOCKET_COLOR);
+	add_output("Color", SHADER_SOCKET_COLOR);
+}
+
+void RGBCurvesNode::compile(SVMCompiler& compiler)
+{
+	ShaderInput *fac_in = input("Fac");
+	ShaderInput *color_in = input("Color");
+	ShaderOutput *color_out = output("Color");
+
+	compiler.stack_assign(fac_in);
+	compiler.stack_assign(color_in);
+	compiler.stack_assign(color_out);
+
+	compiler.add_node(NODE_RGB_CURVES, fac_in->stack_offset, color_in->stack_offset, color_out->stack_offset);
+	compiler.add_array(curves, RAMP_TABLE_SIZE);
+}
+
+void RGBCurvesNode::compile(OSLCompiler& compiler)
+{
+	compiler.add(this, "node_rgb_curves");
+}
+
+/* RGBRampNode */
+
+RGBRampNode::RGBRampNode()
+: ShaderNode("rgb_ramp")
+{
+	add_input("Fac", SHADER_SOCKET_FLOAT);
+	add_output("Color", SHADER_SOCKET_COLOR);
+}
+
+void RGBRampNode::compile(SVMCompiler& compiler)
+{
+	ShaderInput *fac_in = input("Fac");
+	ShaderOutput *color_out = output("Color");
+
+	compiler.stack_assign(fac_in);
+	compiler.stack_assign(color_out);
+
+	compiler.add_node(NODE_RGB_RAMP, fac_in->stack_offset, color_out->stack_offset);
+	compiler.add_array(ramp, RAMP_TABLE_SIZE);
+}
+
+void RGBRampNode::compile(OSLCompiler& compiler)
+{
+	compiler.add(this, "node_rgb_ramp");
+}
+
 CCL_NAMESPACE_END
 

intern/cycles/render/nodes.h

@@ -390,6 +390,18 @@ public:
 	SHADER_NODE_CLASS(BumpNode)
 };
 
+class RGBCurvesNode : public ShaderNode {
+public:
+	SHADER_NODE_CLASS(RGBCurvesNode)
+	float4 curves[RAMP_TABLE_SIZE];
+};
+
+class RGBRampNode : public ShaderNode {
+public:
+	SHADER_NODE_CLASS(RGBRampNode)
+	float4 ramp[RAMP_TABLE_SIZE];
+};
+
 CCL_NAMESPACE_END
 
 #endif /* __NODES_H__ */

intern/cycles/render/svm.cpp

@@ -326,6 +326,12 @@ void SVMCompiler::add_node(const float4& f)
 		__float_as_int(f.w)));
 }
 
+void SVMCompiler::add_array(float4 *f, int num)
+{
+	for(int i = 0; i < num; i++)
+		add_node(f[i]);
+}
+
 uint SVMCompiler::attribute(ustring name)
 {
 	return shader_manager->get_attribute_id(name);

intern/cycles/render/svm.h

@@ -67,6 +67,7 @@ public:
 	void add_node(int a = 0, int b = 0, int c = 0, int d = 0);
 	void add_node(NodeType type, const float3& f);
 	void add_node(const float4& f);
+	void add_array(float4 *f, int num);
 	uint attribute(ustring name);
 	uint attribute(Attribute::Standard std);
 	uint encode_uchar4(uint x, uint y = 0, uint z = 0, uint w = 0);

source/blender/makesrna/intern/rna_color.c

@@ -276,7 +276,7 @@ static void rna_ColorRamp_update(Main *bmain, Scene *UNUSED(scene), PointerRNA *
 	}
 }
 
-static void rna_ColorRamp_eval(struct ColorBand *coba, float position, float color[4])
+void rna_ColorRamp_eval(struct ColorBand *coba, float position, float color[4])
 {
 	do_colorband(coba, position, color);
 }

source/blender/nodes/shader/nodes/node_shader_valToRgb.c

@@ -76,7 +76,7 @@ void register_node_type_sh_valtorgb(bNodeTreeType *ttype)
 	static bNodeType ntype;
 
 	node_type_base(ttype, &ntype, SH_NODE_VALTORGB, "ColorRamp", NODE_CLASS_CONVERTOR, NODE_OPTIONS);
-	node_type_compatibility(&ntype, NODE_OLD_SHADING);
+	node_type_compatibility(&ntype, NODE_OLD_SHADING|NODE_NEW_SHADING);
 	node_type_socket_templates(&ntype, sh_node_valtorgb_in, sh_node_valtorgb_out);
 	node_type_size(&ntype, 240, 200, 300);
 	node_type_init(&ntype, node_shader_init_valtorgb);