blender/io_mspgl/material.py

   1 import os
   2
   3 def compute_render_method_hash(material):
   4         descr = ""
   5         for m in material.render_methods:
   6                 if descr:
   7                         descr += ","
   8                 descr += "{}={}".format(m.tag, m.shader)
   9         return hash(descr)
  10
  11 class PropertyNode:
  12         def __init__(self, node_tree, node, socket):
  13                 self.node_tree = node_tree
  14                 self.node = node
  15                 self.socket = socket
  16                 self.type = None
  17                 self.data = None
  18                 self.input = None
  19
  20                 checks = [self.check_group,
  21                         self.check_gray,
  22                         self.check_normal,
  23                         self.check_invert_green,
  24                         self.check_additive_blend,
  25                         self.check_texture]
  26                 for c in checks:
  27                         if c():
  28                                 break
  29
  30         def set_input_from_linked(self, input_sock):
  31                 from .util import get_linked_node_and_socket
  32
  33                 from_node, from_sock = get_linked_node_and_socket(self.node_tree, input_sock)
  34                 self.input = PropertyNode(self.node_tree, from_node, from_sock)
  35                 return self.input
  36
  37         def check_group(self):
  38                 if self.node.type!='GROUP':
  39                         return
  40
  41                 from .util import get_linked_node_and_socket
  42
  43                 output = self.node.node_tree.nodes["Group Output"]
  44                 from_node, from_sock = get_linked_node_and_socket(self.node.node_tree, output.inputs[0])
  45                 inner = PropertyNode(self.node.node_tree, from_node, from_sock)
  46                 if inner.input:
  47                         # TODO This currently only supports a single operation inside the group
  48                         if inner.input.node.type=='GROUP_INPUT':
  49                                 self.type = inner.type
  50                                 self.data = inner.data
  51                                 return self.set_input_from_linked(self.node.inputs[0])
  52
  53         def check_gray(self):
  54                 if self.node.type=='RGBTOBW':
  55                         self.type = 'GRAY'
  56                         self.set_input_from_linked(self.node.inputs["Color"])
  57
  58         def check_normal(self):
  59                 if self.node.type=='NORMAL_MAP':
  60                         self.type = 'NORMAL'
  61                         return self.set_input_from_linked(self.node.inputs["Color"])
  62
  63         def check_invert_green(self):
  64                 if self.node.type!='COMBRGB':
  65                         return
  66
  67                 from .util import get_linked_node_and_socket
  68
  69                 green, _ = get_linked_node_and_socket(self.node_tree, self.node.inputs["G"])
  70                 if not green or green.type!='MATH' or green.operation!='SUBTRACT':
  71                         return
  72                 green, _ = get_linked_node_and_socket(self.node_tree, green.inputs[1])
  73
  74                 red, _ = get_linked_node_and_socket(self.node_tree, self.node.inputs["R"])
  75                 blue, _ = get_linked_node_and_socket(self.node_tree, self.node.inputs["B"])
  76                 if not red or red.type!='SEPRGB' or blue!=red or green!=red:
  77                         return
  78
  79                 self.type = 'INVERT_GREEN'
  80                 return self.set_input_from_linked(red.inputs["Image"])
  81
  82         def check_additive_blend(self):
  83                 if self.node.type=='ADD_SHADER':
  84                         from .util import get_linked_node_and_socket
  85
  86                         for i in range(2):
  87                                 shader, _ = get_linked_node_and_socket(self.node_tree, self.node.inputs[i])
  88                                 if shader.type=='BSDF_TRANSPARENT':
  89                                         self.type = 'ADDITIVE'
  90                                         return self.set_input_from_linked(self.node.inputs[1-i])
  91
  92         def check_texture(self):
  93                 if self.node.type=='TEX_IMAGE':
  94                         self.type = 'TEXTURE'
  95
  96 def get_unlit_inputs(node_tree, node, additive):
  97         from .util import get_linked_node_and_socket
  98
  99         if node.type=='MIX_SHADER' and not additive:
 100                 shader1, _ = get_linked_node_and_socket(node_tree, node.inputs[1])
 101                 shader2, _ = get_linked_node_and_socket(node_tree, node.inputs[2])
 102                 if shader1.type=='BSDF_TRANSPARENT' and shader2.type=='EMISSION':
 103                         factor_input = node.inputs["Fac"]
 104                         factor_from, _ = get_linked_node_and_socket(node_tree, factor_input)
 105                         color_input = shader2.inputs["Color"]
 106                         color_from, _ = get_linked_node_and_socket(node_tree, color_input)
 107                         if factor_from==color_from:
 108                                 return (color_input, factor_input)
 109         elif node.type=='EMISSION':
 110                 color_input = node.inputs["Color"]
 111                 if additive:
 112                         color_from, _ = get_linked_node_and_socket(node_tree, color_input)
 113                         if color_from.type=='MIX_RGB' and color_from.blend_type=='MIX':
 114                                 mix_factor_input = color_from.inputs["Fac"]
 115                                 mix_factor_from, _ = get_linked_node_and_socket(node_tree, mix_factor_input)
 116                                 mix_color_input = color_from.inputs["Color2"]
 117                                 mix_color_from, _ = get_linked_node_and_socket(node_tree, mix_color_input)
 118                                 if mix_factor_from==mix_color_from:
 119                                         return (mix_color_input, mix_factor_input)
 120                 return (color_input, None)
 121         return (None, None)
 122
 123 class MaterialProperty:
 124         def __init__(self, keyword, tex_keyword, value):
 125                 self.keyword = keyword
 126                 self.tex_keyword = tex_keyword
 127                 self.value = value
 128                 self.texture = None
 129                 self.tex_channels = None
 130
 131         def set_from_input(self, node_tree, input_socket, alpha_socket=None):
 132                 if self.keyword:
 133                         if type(self.value)==tuple:
 134                                 if alpha_socket:
 135                                         self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
 136                                 else:
 137                                         self.value = input_socket.default_value[:len(self.value)]
 138                         else:
 139                                 self.value = input_socket.default_value
 140
 141                 if self.tex_keyword:
 142                         from .util import get_linked_node_and_socket
 143
 144                         from_node, from_sock = get_linked_node_and_socket(node_tree, input_socket)
 145                         alpha_from = None
 146                         if from_node:
 147                                 channels = None
 148                                 top_node = PropertyNode(node_tree, from_node, from_sock)
 149                                 n = top_node
 150                                 while n:
 151                                         if n.type=='NORMAL':
 152                                                 channels = ['R', 'G', 'B']
 153                                         elif n.type=='GRAY':
 154                                                 channels = ['Y']
 155                                         elif n.type=='INVERT_GREEN':
 156                                                 channels[1] = '~G'
 157                                         elif n.type=='TEXTURE':
 158                                                 self.texture = n.node
 159                                         n = n.input
 160
 161                                 if alpha_socket:
 162                                         alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
 163                                         if alpha_from and alpha_from!=self.texture:
 164                                                 raise Exception("Separate textures for color and alpha are not supported")
 165
 166                                 if self.texture:
 167                                         if channels:
 168                                                 self.tex_channels = channels
 169                                         elif alpha_from:
 170                                                 self.tex_channels = ['R', 'G', 'B', 'A']
 171                                         elif type(self.value)==tuple:
 172                                                 self.tex_channels = ['R', 'G', 'B']
 173                                         else:
 174                                                 self.tex_channels = ['Y']
 175                                 else:
 176                                         raise Exception("Unsupported property input node type "+from_node.type)
 177
 178 class Material:
 179         def __init__(self, material):
 180                 self.name = material.name
 181                 self.type = None
 182                 self.properties = []
 183
 184                 self.render_mode = material.render_mode
 185                 self.technique = material.technique
 186                 self.render_methods = material.render_methods[:]
 187                 self.uniforms = material.uniforms[:]
 188                 self.receive_shadows = material.receive_shadows
 189                 self.cast_shadows = (material.shadow_method!='NONE')
 190                 self.blend_type = 'ALPHA' if material.blend_method=='BLEND' else 'NONE'
 191                 self.image_based_lighting = material.image_based_lighting
 192
 193                 if self.render_mode=='EXTERNAL' and not self.technique:
 194                         raise Exception("Invalid configuration on material {}: No technique for external rendering".format(self.name))
 195                 elif self.render_mode=='CUSTOM' and not self.render_methods:
 196                         raise Exception("Invalid configuration on material {}: No render methods for custom rendering".format(self.name))
 197
 198                 out_node = next((n for n in material.node_tree.nodes if n.type=='OUTPUT_MATERIAL'), None)
 199                 if not out_node:
 200                         raise Exception("No output node found on material {}".format(self.name))
 201
 202                 from .util import get_linked_node_and_socket
 203
 204                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
 205                 if not surface_node:
 206                         if self.render_mode=='BUILTIN':
 207                                 raise Exception("Invalid configuration on material {}: Empty material with builtin rendering".format(self.name))
 208                         return
 209
 210                 additive_node, _ = check_additive_blend(material.node_tree, surface_node)
 211                 if additive_node:
 212                         self.blend_type = 'ADDITIVE'
 213                         surface_node = additive_node
 214
 215                 if surface_node.type=='BSDF_PRINCIPLED':
 216                         self.type = "pbr"
 217
 218                         base_color = self.create_property("base_color", (0.8, 0.8, 0.8, 1.0))
 219                         metalness = self.create_property("metalness", 0.0)
 220                         roughness = self.create_property("roughness", 0.5)
 221                         normal = self.create_property("normal_map")
 222                         emission = self.create_property("emission", (0.0, 0.0, 0.0))
 223
 224                         base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
 225                         metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
 226                         roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
 227                         normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
 228                         emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
 229                 elif surface_node.type=='EMISSION' or surface_node.type=='MIX_SHADER':
 230                         color_input, alpha_input = get_unlit_inputs(material.node_tree, surface_node, self.blend_type=='ADDITIVE')
 231                         if not color_input:
 232                                 raise Exception("Unsupported configuration for unlit material {}".format(self.name))
 233
 234                         self.type = "unlit"
 235
 236                         color = self.create_property("color", "texture", (1.0, 1.0, 1.0, 1.0))
 237
 238                         color.set_from_input(material.node_tree, color_input, alpha_input)
 239                         if self.blend_type=='ADDITIVE' and alpha_input:
 240                                 self.blend_type = 'ADDITIVE_ALPHA'
 241                 else:
 242                         raise Exception("Unsupported surface node type {} on material {}".format(surface_node.type, self.name))
 243
 244                 sampler_settings = None
 245                 for p in self.properties:
 246                         if p.texture:
 247                                 settings = (p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
 248                                 if sampler_settings is None:
 249                                         sampler_settings = settings
 250                                 elif settings!=sampler_settings:
 251                                         raise Exception("Material {} has conflicting texture sampler settings".format(self.name))
 252
 253         def create_property(self, *args):
 254                 prop = None
 255                 if len(args)==1:
 256                         prop = MaterialProperty(None, args[0], None)
 257                 elif len(args)==2:
 258                         prop = MaterialProperty(args[0], args[0]+"_map", args[1])
 259                 else:
 260                         prop = MaterialProperty(*args)
 261                 self.properties.append(prop)
 262                 return prop
 263
 264
 265 class MaterialAtlas:
 266         def __init__(self, materials):
 267                 self.render_mode = materials[0].render_mode
 268                 if self.render_mode=='EXTERNAL':
 269                         raise Exception("Material atlas with external render mode does not make sense")
 270
 271                 if self.render_mode=='CUSTOM':
 272                         self.render_methods = materials[0].render_methods
 273                 else:
 274                         self.render_methods = None
 275                 if self.render_methods:
 276                         self.name = "material_atlas_"+os.path.splitext(self.render_methods[0].shader)[0]
 277                 else:
 278                         self.name = "material_atlas"
 279                 self.receive_shadows = materials[0].receive_shadows
 280                 self.cast_shadows = (materials[0].shadow_method!='NONE')
 281                 self.materials = materials
 282                 self.material_names = [m.name for m in self.materials]
 283                 self.uniforms = None
 284                 method_hash = compute_render_method_hash(self)
 285                 for m in self.materials:
 286                         if m.render_mode!=self.render_mode:
 287                                 raise Exception("Conflicting render modes in MaterialAtlas constructor")
 288                         if self.render_mode=='CUSTOM' and compute_render_method_hash(m)!=method_hash:
 289                                 raise Exception("Conflicting shaders in MaterialAtlas constructor")
 290                         if m.receive_shadows!=self.receive_shadows or m.shadow_method!=materials[0].shadow_method:
 291                                 raise Exception("Conflicting shadow settings in MaterialAtlas constructor")
 292
 293                 count = len(self.materials)
 294                 size = 1
 295                 while size*size*2<count:
 296                         size *= 2
 297                 if size*size>=count:
 298                         self.size = (size, size)
 299                 else:
 300                         self.size = (size*2, size)
 301
 302                 from .util import get_colormap
 303
 304                 cm = get_colormap(True)
 305                 self.base_color_data = ""
 306                 for m in map(Material, self.materials):
 307                         if any(p.texture for p in m.properties):
 308                                 raise Exception("Texturing is incompatible with material atlas")
 309                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 310                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 311                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 312
 313         def get_material_uv(self, material):
 314                 index = self.material_names.index(material.name)
 315                 x = index%self.size[0]
 316                 y = index//self.size[0]
 317                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 318
 319 def create_material_atlas(context, material):
 320         if not material.material_atlas:
 321                 raise Exception("Material is not part of a material atlas")
 322
 323         method_hash = compute_render_method_hash(material)
 324         materials = []
 325         for m in context.blend_data.materials:
 326                 if m.material_atlas and compute_render_method_hash(m)==method_hash:
 327                         materials.append(m)
 328
 329         return MaterialAtlas(materials)