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                 elif surface_node.type=='EMISSION':
  96                         self.type = "unlit"
  97
  98                         color = self.create_property("color", "texture", (1.0, 1.0, 1.0, 1.0))
  99
 100                         color.set_from_input(material.node_tree, surface_node.inputs["Color"])
 101                 else:
 102                         raise Exception("Unsupported surface node type "+surface_node.type)
 103
 104                 sampler_settings = None
 105                 for p in self.properties:
 106                         if p.texture:
 107                                 settings = (p.texture.default_filter, p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
 108                                 if sampler_settings is None:
 109                                         sampler_settings = settings
 110                                 elif settings!=sampler_settings:
 111                                         raise Exception("Conflicting sampler settings in material textures")
 112
 113         def create_property(self, *args):
 114                 prop = None
 115                 if len(args)==1:
 116                         prop = MaterialProperty(None, args[0], None)
 117                 elif len(args)==2:
 118                         prop = MaterialProperty(args[0], args[0]+"_map", args[1])
 119                 else:
 120                         prop = MaterialProperty(*args)
 121                 self.properties.append(prop)
 122                 return prop
 123
 124
 125 class MaterialAtlas:
 126         def __init__(self, materials):
 127                 self.render_mode = materials[0].render_mode
 128                 if self.render_mode=='EXTERNAL':
 129                         raise Exception("Material atlas with external render mode does not make sense")
 130
 131                 self.shader = materials[0].shader
 132                 if self.shader:
 133                         self.name = "material_atlas_"+os.path.splitext(self.shader)[0]
 134                 else:
 135                         self.name = "material_atlas"
 136                 self.materials = materials
 137                 self.material_names = [m.name for m in self.materials]
 138                 for m in self.materials:
 139                         if m.render_mode!=self.render_mode:
 140                                 raise Exception("Conflicting render modes in MaterialAtlas constructor")
 141                         if self.render_mode=='CUSTOM' and m.shader!=self.shader:
 142                                 raise Exception("Conflicting shaders in MaterialAtlas constructor")
 143
 144                 count = len(self.materials)
 145                 size = 1
 146                 while size*size*2<count:
 147                         size *= 2
 148                 if size*size>=count:
 149                         self.size = (size, size)
 150                 else:
 151                         self.size = (size*2, size)
 152
 153                 from .util import get_colormap
 154
 155                 cm = get_colormap(True)
 156                 self.base_color_data = ""
 157                 for m in map(Material, self.materials):
 158                         if any(p.texture for p in m.properties):
 159                                 raise Exception("Texturing is incompatible with material atlas")
 160                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 161                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 162                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 163
 164         def get_material_uv(self, material):
 165                 index = self.material_names.index(material.name)
 166                 x = index%self.size[0]
 167                 y = index//self.size[0]
 168                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 169
 170 def create_material_atlas(context, material):
 171         if not material.material_atlas:
 172                 raise Exception("Material is not part of a material atlas")
 173
 174         shader = material.shader
 175         materials = []
 176         for m in context.blend_data.materials:
 177                 if m.material_atlas and m.shader==shader:
 178                         materials.append(m)
 179
 180         mat_map = MaterialAtlas(materials)
 181
 182         return mat_map