]> git.tdb.fi Git - libs/gl.git/blob - blender/io_mspgl/material.py
Refactor material property handling in the Blender exporter
[libs/gl.git] / blender / io_mspgl / material.py
1 import os
2
3 def get_linked_node_and_socket(node_tree, socket):
4         for l in node_tree.links:
5                 if socket==l.to_socket:
6                         return (l.from_node, l.from_socket)
7                 elif socket==l.from_socket:
8                         return (l.to_node, l.to_socket)
9         return (None, None)
10
11 class MaterialProperty:
12         def __init__(self, keyword, tex_keyword, value):
13                 self.keyword = keyword
14                 self.tex_keyword = tex_keyword
15                 self.value = value
16                 self.texture = None
17                 self.tex_usage = None
18
19         def set_from_input(self, node_tree, input_socket, alpha_socket=None):
20                 if self.keyword:
21                         if type(self.value)==tuple:
22                                 if alpha_socket:
23                                         self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
24                                 else:
25                                         self.value = input_socket.default_value[:len(self.value)]
26                         else:
27                                 self.value = input_socket.default_value
28
29                 if self.tex_keyword:
30                         from_node, _ = get_linked_node_and_socket(node_tree, input_socket)
31                         alpha_from = None
32                         if from_node:
33                                 if from_node.type=='NORMAL_MAP':
34                                         from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
35
36                                 if alpha_socket:
37                                         alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
38                                         if alpha_from and alpha_from!=from_node:
39                                                 raise Exception("Separate textures for color and alpha are not supported")
40
41                                 if from_node.type=='TEX_IMAGE':
42                                         self.texture = from_node
43                                         if alpha_from:
44                                                 self.tex_usage = 'RGBA'
45                                         elif type(self.value)==tuple:
46                                                 self.tex_usage = 'RGB'
47                                         else:
48                                                 self.tex_usage = 'GRAY'
49                                 else:
50                                         raise Exception("Unsupported property input node type "+from_node.type)
51
52 class Material:
53         def __init__(self, material):
54                 self.name = material.name
55                 self.type = None
56                 self.properties = []
57
58                 self.render_mode = material.render_mode
59                 self.technique = material.technique
60                 self.shader = material.shader
61
62                 if self.render_mode=='EXTERNAL' and not self.technique:
63                         raise Exception("Missing technique with external rendering mode")
64                 elif self.render_mode=='CUSTOM' and not self.shader:
65                         raise Exception("Missing shader with custom rendering mode")
66
67                 out_node = None
68                 for n in material.node_tree.nodes:
69                         if n.type=='OUTPUT_MATERIAL':
70                                 out_node = n
71                                 break
72
73                 if not out_node:
74                         raise Exception("No material output node found")
75
76                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
77                 if not surface_node:
78                         if self.render_mode=='BUILTIN':
79                                 raise Exception("Empty material can't use builtin rendering mode")
80                         return
81                 elif surface_node.type=='BSDF_PRINCIPLED':
82                         self.type = "pbr"
83
84                         base_color = self.create_property("base_color", (0.8, 0.8, 0.8, 1.0))
85                         metalness = self.create_property("metalness", 0.0)
86                         roughness = self.create_property("roughness", 0.5)
87                         normal = self.create_property("normal")
88                         emission = self.create_property("emission", (0.0, 0.0, 0.0))
89
90                         base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
91                         metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
92                         roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
93                         normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
94                         emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
95                 else:
96                         raise Exception("Unsupported surface node type "+surface_node.type)
97
98                 sampler_settings = None
99                 for p in self.properties:
100                         if p.texture:
101                                 settings = (p.texture.default_filter, p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
102                                 if sampler_settings is None:
103                                         sampler_settings = settings
104                                 elif settings!=sampler_settings:
105                                         raise Exception("Conflicting sampler settings in material textures")
106
107         def create_property(self, *args):
108                 prop = None
109                 if len(args)==1:
110                         prop = MaterialProperty(None, args[0], None)
111                 elif len(args)==2:
112                         prop = MaterialProperty(args[0], args[0]+"_map", args[1])
113                 else:
114                         prop = MaterialProperty(*args)
115                 self.properties.append(prop)
116                 return prop
117
118
119 class MaterialMap:
120         def __init__(self, materials):
121                 self.render_mode = materials[0].render_mode
122                 if self.render_mode=='EXTERNAL':
123                         raise Exception("Material map with external render mode does not make sense")
124
125                 self.shader = materials[0].shader
126                 if self.shader:
127                         self.name = "material_map_"+os.path.splitext(self.shader)[0]
128                 else:
129                         self.name = "material_map"
130                 self.materials = materials
131                 self.material_names = [m.name for m in self.materials]
132                 for m in self.materials:
133                         if m.render_mode!=self.render_mode:
134                                 raise Exception("Conflicting render modes in MaterialMap constructor")
135                         if self.render_mode=='CUSTOM' and m.shader!=self.shader:
136                                 raise Exception("Conflicting shaders in MaterialMap constructor")
137
138                 count = len(self.materials)
139                 size = 1
140                 while size*size*2<count:
141                         size *= 2
142                 if size*size>=count:
143                         self.size = (size, size)
144                 else:
145                         self.size = (size*2, size)
146
147                 from .util import get_colormap
148
149                 cm = get_colormap(True)
150                 self.base_color_data = ""
151                 for m in map(Material, self.materials):
152                         if any(p.texture for p in m.properties):
153                                 raise Exception("Texturing is incompatible with material map")
154                         base_color = [int(cm(c)*255) for c in m.base_color.value]
155                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
156                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
157
158         def get_material_uv(self, material):
159                 index = self.material_names.index(material.name)
160                 x = index%self.size[0]
161                 y = index//self.size[0]
162                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
163
164 def create_material_map(context, material):
165         if not material.material_map:
166                 raise Exception("Material is not part of a material map")
167
168         shader = material.shader
169         materials = []
170         for m in context.blend_data.materials:
171                 if m.material_map and m.shader==shader:
172                         materials.append(m)
173
174         mat_map = MaterialMap(materials)
175
176         return mat_map