Add Classic Kuwahara filter node

addons/material_maker/nodes/classic_kuwahara.mmg

@@ -0,0 +1,311 @@
+{
+	"connections": [
+		{
+			"from": "gen_inputs",
+			"from_port": 0,
+			"to": "switch",
+			"to_port": 0
+		},
+		{
+			"from": "gen_inputs",
+			"from_port": 0,
+			"to": "buffer_2",
+			"to_port": 0
+		},
+		{
+			"from": "buffer_2",
+			"from_port": 0,
+			"to": "switch",
+			"to_port": 1
+		},
+		{
+			"from": "switch",
+			"from_port": 0,
+			"to": "shader_1",
+			"to_port": 0
+		},
+		{
+			"from": "shader_1",
+			"from_port": 0,
+			"to": "gen_outputs",
+			"to_port": 0
+		}
+	],
+	"label": "Classic Kuwahara",
+	"longdesc": "Simple edge-preserving smoothing filter",
+	"name": "classic_kuwahara",
+	"node_position": {
+		"x": 0,
+		"y": 0
+	},
+	"nodes": [
+		{
+			"name": "gen_parameters",
+			"node_position": {
+				"x": -723.910156,
+				"y": -199.916687
+			},
+			"parameters": {
+				"buffer": 0,
+				"resolution": 10,
+				"size": 6
+			},
+			"seed": 56582,
+			"type": "remote",
+			"widgets": [
+				{
+					"label": "",
+					"linked_widgets": [
+						{
+							"node": "buffer_2",
+							"widget": "size"
+						},
+						{
+							"node": "shader_1",
+							"widget": "s"
+						}
+					],
+					"longdesc": "Resolution used to sample the input",
+					"name": "resolution",
+					"shortdesc": "Resolution",
+					"type": "linked_control"
+				},
+				{
+					"label": "Size",
+					"linked_widgets": [
+						{
+							"node": "shader_1",
+							"widget": "size"
+						}
+					],
+					"longdesc": "Size of the filter",
+					"name": "size",
+					"shortdesc": "Size",
+					"type": "linked_control"
+				},
+				{
+					"configurations": {
+						"False": [
+							{
+								"node": "switch",
+								"value": 0,
+								"widget": "source"
+							}
+						],
+						"True": [
+							{
+								"node": "switch",
+								"value": 1,
+								"widget": "source"
+							}
+						]
+					},
+					"label": "Buffer",
+					"linked_widgets": [
+						{
+							"node": "switch",
+							"widget": "source"
+						}
+					],
+					"longdesc": "When set, a buffer is used to sample the input before the kuwahara filter",
+					"name": "buffer",
+					"shortdesc": "Buffer",
+					"type": "config_control"
+				}
+			]
+		},
+		{
+			"name": "gen_outputs",
+			"node_position": {
+				"x": -379.663818,
+				"y": 17.047363
+			},
+			"parameters": {
+
+			},
+			"ports": [
+				{
+					"group_size": 0,
+					"longdesc": "Filtered Image",
+					"name": "out",
+					"shortdesc": "Output",
+					"type": "rgb"
+				}
+			],
+			"seed": -6314,
+			"type": "ios"
+		},
+		{
+			"name": "gen_inputs",
+			"node_position": {
+				"x": -981.910156,
+				"y": 31.047363
+			},
+			"parameters": {
+
+			},
+			"ports": [
+				{
+					"group_size": 0,
+					"longdesc": "Input image",
+					"name": "in",
+					"shortdesc": "Input",
+					"type": "rgb"
+				}
+			],
+			"seed": 12483,
+			"seed_locked": true,
+			"type": "ios"
+		},
+		{
+			"name": "switch",
+			"node_position": {
+				"x": -621.5,
+				"y": 133.297363
+			},
+			"parameters": {
+				"choices": 2,
+				"outputs": 1,
+				"source": 0
+			},
+			"seed": -53264,
+			"type": "switch"
+		},
+		{
+			"name": "shader_1",
+			"node_position": {
+				"x": -599.996094,
+				"y": 16.618835
+			},
+			"parameters": {
+				"s": 10,
+				"size": 6
+			},
+			"seed_int": 0,
+			"shader_model": {
+				"code": "",
+				"global": "",
+				"inputs": [
+					{
+						"default": "vec3(0.0)",
+						"function": true,
+						"label": "",
+						"name": "in",
+						"type": "rgb"
+					}
+				],
+				"instance": [
+					"// License: GPLv3 / Jan Eric Kyprianidis <www.kyprianidis.com>",
+					"// Source: https://code.google.com/archive/p/gpuakf/",
+					"vec3 $(name)_classic_kuwahara(vec2 uv, int radius) {",
+					"\tfloat n = float((radius + 1) * (radius + 1));",
+					"\tvec3 col = vec3(0.0);",
+					"",
+					"\tvec3 m[4];",
+					"\tvec3 s[4];",
+					"\tfor (int k = 0; k < 4; ++k) {",
+					"\t  m[k] = vec3(0.0);",
+					"\t  s[k] = vec3(0.0);",
+					"\t}",
+					"",
+					"\tfor (int j = -radius; j <= 0; ++j)  {",
+					"\t\tfor (int i = -radius; i <= 0; ++i)  {",
+					"\t\t   vec3 c = $in(uv + vec2(float(i),float(j)) * 1.0/$s).rgb;",
+					"\t\t   m[0] += c;",
+					"\t\t   s[0] += c * c;",
+					"\t\t}",
+					"\t}",
+					"",
+					"\tfor (int j = -radius; j <= 0; ++j)  {",
+					"\t\tfor (int i = 0; i <= radius; ++i)  {",
+					"\t\t\tvec3 c = $in(uv + vec2(float(i),float(j)) * 1.0/$s).rgb;",
+					"\t\t\tm[1] += c;",
+					"\t\t\ts[1] += c * c;",
+					"\t\t}",
+					"\t}",
+					"",
+					"\tfor (int j = 0; j <= radius; ++j)  {",
+					"\t\tfor (int i = 0; i <= radius; ++i)  {",
+					"\t\t   vec3 c = $in(uv + vec2(float(i),float(j)) * 1.0/$s).rgb;",
+					"\t\t   m[2] += c;",
+					"\t\t   s[2] += c * c;",
+					"\t\t}",
+					"\t}",
+					"",
+					"\tfor (int j = 0; j <= radius; ++j)  {",
+					"\t\tfor (int i = -radius; i <= 0; ++i)  {",
+					"\t\t\tvec3 c = $in(uv + vec2(float(i),float(j)) * 1.0/$s).rgb;",
+					"\t\t\tm[3] += c;",
+					"\t\t\ts[3] += c * c;",
+					"\t\t}",
+					"\t}",
+					"",
+					"\tfloat min_sigma2 = 1e+2;",
+					"\tfor (int k = 0; k < 4; ++k) {",
+					"\t\tm[k] /= n;",
+					"\t\ts[k] = abs(s[k] / n - m[k] * m[k]);",
+					"",
+					"\t\tfloat sigma2 = s[k].r + s[k].g + s[k].b;",
+					"\t\tif (sigma2 < min_sigma2) {",
+					"\t\t\tmin_sigma2 = sigma2;",
+					"\t\t\tcol = m[k];",
+					"\t\t}",
+					"\t}",
+					"\treturn col;",
+					"}"
+				],
+				"name": "classic_kuwahara",
+				"outputs": [
+					{
+						"rgb": "$(name)_classic_kuwahara($uv, int(max($size,0.0)))",
+						"type": "rgb"
+					}
+				],
+				"parameters": [
+					{
+						"default": 10,
+						"first": 4,
+						"label": "",
+						"last": 13,
+						"name": "s",
+						"type": "size"
+					},
+					{
+						"control": "None",
+						"default": 6,
+						"label": "Size",
+						"longdesc": "Size of the filter",
+						"max": 100,
+						"min": 1,
+						"name": "size",
+						"shortdesc": "Size",
+						"step": 1,
+						"type": "float"
+					}
+				]
+			},
+			"type": "shader"
+		},
+		{
+			"name": "buffer_2",
+			"node_position": {
+				"x": -878.496094,
+				"y": 140.618835
+			},
+			"parameters": {
+				"size": 10
+			},
+			"seed_int": 0,
+			"type": "buffer",
+			"version": 1
+		}
+	],
+	"parameters": {
+		"buffer": 0,
+		"resolution": 10,
+		"size": 6
+	},
+	"seed_int": 0,
+	"shortdesc": "Classic Kuwahara Filter",
+	"type": "graph"
+}

material_maker/doc/node_filter_classic_kuwahara.rst

@@ -0,0 +1,34 @@
+Classic Kuwahara node
+~~~~~~~~~~~~~~~~~~~~~
+
+The **Classic Kuwahara** node applies a simple edge-preserving smoothing filter to its input.
+
+.. image:: images/node_filter_classic_kuwahara.png
+	:align: center
+
+Inputs
+++++++
+
+The **Classic Kuwahara** node has a single input.
+
+Outputs
++++++++
+
+The **Classic Kuwahara** node outputs the result of the smoothing filter.
+
+Parameters
+++++++++++
+
+The **Classic Kuwahara** node accepts the following parameters:
+
+* **Resolution** used to sample the input.
+
+* **Size** of the filter.
+
+* Whether a **Buffer** is used to sample the input before the filter.
+
+Example images
+++++++++++++++
+
+.. image:: images/node_classic_kuwahara_samples.png
+	:align: center

material_maker/doc/nodes_filter.rst

@@ -63,4 +63,5 @@ The filter nodes accept one or several inputs and generate one or several images
 	node_filter_color_conversion
 	node_filter_normal_to_height
 	node_filter_colorspace_roundtrip
+	node_filter_classic_kuwahara
 	node_filter_generalized_kuwahara

material_maker/library/base.json

@@ -7042,6 +7042,18 @@
 			"tree_item": "Miscellaneous/Mesh Map",
 			"type": "meshmap"
 		},
+		{
+			"icon_data": 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+			"name": "classic_kuwahara",
+			"parameters": {
+				"buffer": 1,
+				"resolution": 10,
+				"size": 6
+			},
+			"seed_int": 0,
+			"tree_item": "Filter/Classic Kuwahara",
+			"type": "classic_kuwahara"
+		},
 		{
 			"icon_data": "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",
 			"name": "splines",