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                                 elif from_node.type=='RGBTOBW':
  36                                         from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
  37
  38                                 if alpha_socket:
  39                                         alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
  40                                         if alpha_from and alpha_from!=from_node:
  41                                                 raise Exception("Separate textures for color and alpha are not supported")
  42
  43                                 if from_node.type=='TEX_IMAGE':
  44                                         self.texture = from_node
  45                                         if alpha_from:
  46                                                 self.tex_usage = 'RGBA'
  47                                         elif type(self.value)==tuple:
  48                                                 self.tex_usage = 'RGB'
  49                                         else:
  50                                                 self.tex_usage = 'GRAY'
  51                                 else:
  52                                         raise Exception("Unsupported property input node type "+from_node.type)
  53
  54 class Material:
  55         def __init__(self, material):
  56                 self.name = material.name
  57                 self.type = None
  58                 self.properties = []
  59
  60                 self.render_mode = material.render_mode
  61                 self.technique = material.technique
  62                 self.shader = material.shader
  63
  64                 if self.render_mode=='EXTERNAL' and not self.technique:
  65                         raise Exception("Missing technique with external rendering mode")
  66                 elif self.render_mode=='CUSTOM' and not self.shader:
  67                         raise Exception("Missing shader with custom rendering mode")
  68
  69                 out_node = None
  70                 for n in material.node_tree.nodes:
  71                         if n.type=='OUTPUT_MATERIAL':
  72                                 out_node = n
  73                                 break
  74
  75                 if not out_node:
  76                         raise Exception("No material output node found")
  77
  78                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
  79                 if not surface_node:
  80                         if self.render_mode=='BUILTIN':
  81                                 raise Exception("Empty material can't use builtin rendering mode")
  82                         return
  83                 elif surface_node.type=='BSDF_PRINCIPLED':
  84                         self.type = "pbr"
  85
  86                         base_color = self.create_property("base_color", (0.8, 0.8, 0.8, 1.0))
  87                         metalness = self.create_property("metalness", 0.0)
  88                         roughness = self.create_property("roughness", 0.5)
  89                         normal = self.create_property("normal_map")
  90                         emission = self.create_property("emission", (0.0, 0.0, 0.0))
  91
  92                         base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
  93                         metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
  94                         roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
  95                         normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
  96                         emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
  97                 elif surface_node.type=='EMISSION':
  98                         self.type = "unlit"
  99
 100                         color = self.create_property("color", "texture", (1.0, 1.0, 1.0, 1.0))
 101
 102                         color.set_from_input(material.node_tree, surface_node.inputs["Color"])
 103                 else:
 104                         raise Exception("Unsupported surface node type "+surface_node.type)
 105
 106                 sampler_settings = None
 107                 for p in self.properties:
 108                         if p.texture:
 109                                 settings = (p.texture.default_filter, p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
 110                                 if sampler_settings is None:
 111                                         sampler_settings = settings
 112                                 elif settings!=sampler_settings:
 113                                         raise Exception("Conflicting sampler settings in material textures")
 114
 115         def create_property(self, *args):
 116                 prop = None
 117                 if len(args)==1:
 118                         prop = MaterialProperty(None, args[0], None)
 119                 elif len(args)==2:
 120                         prop = MaterialProperty(args[0], args[0]+"_map", args[1])
 121                 else:
 122                         prop = MaterialProperty(*args)
 123                 self.properties.append(prop)
 124                 return prop
 125
 126
 127 class MaterialAtlas:
 128         def __init__(self, materials):
 129                 self.render_mode = materials[0].render_mode
 130                 if self.render_mode=='EXTERNAL':
 131                         raise Exception("Material atlas with external render mode does not make sense")
 132
 133                 self.shader = materials[0].shader
 134                 if self.shader:
 135                         self.name = "material_atlas_"+os.path.splitext(self.shader)[0]
 136                 else:
 137                         self.name = "material_atlas"
 138                 self.materials = materials
 139                 self.material_names = [m.name for m in self.materials]
 140                 for m in self.materials:
 141                         if m.render_mode!=self.render_mode:
 142                                 raise Exception("Conflicting render modes in MaterialAtlas constructor")
 143                         if self.render_mode=='CUSTOM' and m.shader!=self.shader:
 144                                 raise Exception("Conflicting shaders in MaterialAtlas constructor")
 145
 146                 count = len(self.materials)
 147                 size = 1
 148                 while size*size*2<count:
 149                         size *= 2
 150                 if size*size>=count:
 151                         self.size = (size, size)
 152                 else:
 153                         self.size = (size*2, size)
 154
 155                 from .util import get_colormap
 156
 157                 cm = get_colormap(True)
 158                 self.base_color_data = ""
 159                 for m in map(Material, self.materials):
 160                         if any(p.texture for p in m.properties):
 161                                 raise Exception("Texturing is incompatible with material atlas")
 162                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 163                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 164                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 165
 166         def get_material_uv(self, material):
 167                 index = self.material_names.index(material.name)
 168                 x = index%self.size[0]
 169                 y = index//self.size[0]
 170                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 171
 172 def create_material_atlas(context, material):
 173         if not material.material_atlas:
 174                 raise Exception("Material is not part of a material atlas")
 175
 176         shader = material.shader
 177         materials = []
 178         for m in context.blend_data.materials:
 179                 if m.material_atlas and m.shader==shader:
 180                         materials.append(m)
 181
 182         mat_map = MaterialAtlas(materials)
 183
 184         return mat_map