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_channels,
  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_channels(self):
  64                 if self.node.type!='COMBRGB':
  65                         return
  66
  67                 from .util import get_linked_node_and_socket
  68
  69                 separate = None
  70                 invert_channels = ""
  71                 for c in ("R", "G", "B"):
  72                         from_node, _ = get_linked_node_and_socket(self.node_tree, self.node.inputs[c])
  73                         if from_node.type=='MATH' and from_node.operation=='SUBTRACT' and not from_node.inputs[0].is_linked and from_node.inputs[0].default_value==1.0:
  74                                 invert_channels += c
  75                                 from_node, _ = get_linked_node_and_socket(self.node_tree, from_node.inputs[1])
  76
  77                         if from_node.type=='SEPRGB' and (separate is None or from_node==separate):
  78                                 separate = from_node
  79                         else:
  80                                 return
  81
  82                 self.type = 'INVERT'
  83                 self.data = invert_channels
  84
  85                 return self.set_input_from_linked(separate.inputs["Image"])
  86
  87         def check_additive_blend(self):
  88                 if self.node.type=='ADD_SHADER':
  89                         from .util import get_linked_node_and_socket
  90
  91                         for i in range(2):
  92                                 shader, _ = get_linked_node_and_socket(self.node_tree, self.node.inputs[i])
  93                                 if shader.type=='BSDF_TRANSPARENT':
  94                                         self.type = 'ADDITIVE'
  95                                         return self.set_input_from_linked(self.node.inputs[1-i])
  96
  97         def check_texture(self):
  98                 if self.node.type=='TEX_IMAGE':
  99                         self.type = 'TEXTURE'
 100
 101 def get_unlit_inputs(node_tree, node, additive):
 102         from .util import get_linked_node_and_socket
 103
 104         if node.type=='MIX_SHADER' and not additive:
 105                 shader1, _ = get_linked_node_and_socket(node_tree, node.inputs[1])
 106                 shader2, _ = get_linked_node_and_socket(node_tree, node.inputs[2])
 107                 if shader1.type=='BSDF_TRANSPARENT' and shader2.type=='EMISSION':
 108                         factor_input = node.inputs["Fac"]
 109                         factor_from, _ = get_linked_node_and_socket(node_tree, factor_input)
 110                         color_input = shader2.inputs["Color"]
 111                         color_from, _ = get_linked_node_and_socket(node_tree, color_input)
 112                         if factor_from==color_from:
 113                                 return (color_input, factor_input)
 114         elif node.type=='EMISSION':
 115                 color_input = node.inputs["Color"]
 116                 if additive:
 117                         color_from, _ = get_linked_node_and_socket(node_tree, color_input)
 118                         if color_from.type=='MIX_RGB' and color_from.blend_type=='MIX':
 119                                 mix_factor_input = color_from.inputs["Fac"]
 120                                 mix_factor_from, _ = get_linked_node_and_socket(node_tree, mix_factor_input)
 121                                 mix_color_input = color_from.inputs["Color2"]
 122                                 mix_color_from, _ = get_linked_node_and_socket(node_tree, mix_color_input)
 123                                 if mix_factor_from==mix_color_from:
 124                                         return (mix_color_input, mix_factor_input)
 125                 return (color_input, None)
 126         return (None, None)
 127
 128 class MaterialProperty:
 129         def __init__(self, keyword, tex_keyword, value):
 130                 self.keyword = keyword
 131                 self.tex_keyword = tex_keyword
 132                 self.value = value
 133                 self.texture = None
 134                 self.tex_channels = None
 135
 136         def set_from_input(self, node_tree, input_socket, alpha_socket=None):
 137                 if self.keyword:
 138                         if type(self.value)==tuple:
 139                                 if alpha_socket:
 140                                         self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
 141                                 else:
 142                                         self.value = input_socket.default_value[:len(self.value)]
 143                         else:
 144                                 self.value = input_socket.default_value
 145
 146                 if self.tex_keyword:
 147                         from .util import get_linked_node_and_socket
 148
 149                         from_node, from_sock = get_linked_node_and_socket(node_tree, input_socket)
 150                         alpha_from = None
 151                         if from_node:
 152                                 channels = None
 153                                 top_node = PropertyNode(node_tree, from_node, from_sock)
 154                                 n = top_node
 155                                 while n:
 156                                         if n.type=='NORMAL':
 157                                                 channels = ['R', 'G', 'B']
 158                                         elif n.type=='GRAY':
 159                                                 channels = ['Y']
 160                                         elif n.type=='INVERT':
 161                                                 channels = ['~'+c if c in n.data else c for c in channels]
 162                                         elif n.type=='TEXTURE':
 163                                                 self.texture = n.node
 164                                         n = n.input
 165
 166                                 if alpha_socket:
 167                                         alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
 168                                         if alpha_from and alpha_from!=self.texture:
 169                                                 raise Exception("Separate textures for color and alpha are not supported")
 170
 171                                 if self.texture:
 172                                         if channels:
 173                                                 self.tex_channels = channels
 174                                         elif alpha_from:
 175                                                 self.tex_channels = ['R', 'G', 'B', 'A']
 176                                         elif type(self.value)==tuple:
 177                                                 self.tex_channels = ['R', 'G', 'B']
 178                                         else:
 179                                                 self.tex_channels = ['Y']
 180                                 else:
 181                                         raise Exception("Unsupported property input node type "+from_node.type)
 182
 183 class Material:
 184         def __init__(self, material):
 185                 self.name = material.name
 186                 self.type = None
 187                 self.properties = []
 188
 189                 self.render_mode = material.render_mode
 190                 self.technique = material.technique
 191                 self.render_methods = material.render_methods[:]
 192                 self.uniforms = material.uniforms[:]
 193                 self.receive_shadows = material.receive_shadows
 194                 self.cast_shadows = (material.shadow_method!='NONE')
 195                 self.blend_type = 'ALPHA' if material.blend_method=='BLEND' else 'NONE'
 196                 self.image_based_lighting = material.image_based_lighting
 197
 198                 if self.render_mode=='EXTERNAL' and not self.technique:
 199                         raise Exception("Invalid configuration on material {}: No technique for external rendering".format(self.name))
 200                 elif self.render_mode=='CUSTOM' and not self.render_methods:
 201                         raise Exception("Invalid configuration on material {}: No render methods for custom rendering".format(self.name))
 202
 203                 out_node = next((n for n in material.node_tree.nodes if n.type=='OUTPUT_MATERIAL'), None)
 204                 if not out_node:
 205                         raise Exception("No output node found on material {}".format(self.name))
 206
 207                 from .util import get_linked_node_and_socket
 208
 209                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
 210                 if not surface_node:
 211                         if self.render_mode=='BUILTIN':
 212                                 raise Exception("Invalid configuration on material {}: Empty material with builtin rendering".format(self.name))
 213                         return
 214
 215                 additive_node, _ = check_additive_blend(material.node_tree, surface_node)
 216                 if additive_node:
 217                         self.blend_type = 'ADDITIVE'
 218                         surface_node = additive_node
 219
 220                 if surface_node.type=='BSDF_PRINCIPLED':
 221                         self.type = "pbr"
 222
 223                         base_color = self.create_property("base_color", (0.8, 0.8, 0.8, 1.0))
 224                         metalness = self.create_property("metalness", 0.0)
 225                         roughness = self.create_property("roughness", 0.5)
 226                         normal = self.create_property("normal_map")
 227                         emission = self.create_property("emission", (0.0, 0.0, 0.0))
 228
 229                         base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
 230                         metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
 231                         roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
 232                         normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
 233                         emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
 234                 elif surface_node.type=='EMISSION' or surface_node.type=='MIX_SHADER':
 235                         color_input, alpha_input = get_unlit_inputs(material.node_tree, surface_node, self.blend_type=='ADDITIVE')
 236                         if not color_input:
 237                                 raise Exception("Unsupported configuration for unlit material {}".format(self.name))
 238
 239                         self.type = "unlit"
 240
 241                         color = self.create_property("color", "texture", (1.0, 1.0, 1.0, 1.0))
 242
 243                         color.set_from_input(material.node_tree, color_input, alpha_input)
 244                         if self.blend_type=='ADDITIVE' and alpha_input:
 245                                 self.blend_type = 'ADDITIVE_ALPHA'
 246                 else:
 247                         raise Exception("Unsupported surface node type {} on material {}".format(surface_node.type, self.name))
 248
 249                 sampler_settings = None
 250                 for p in self.properties:
 251                         if p.texture:
 252                                 settings = (p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
 253                                 if sampler_settings is None:
 254                                         sampler_settings = settings
 255                                 elif settings!=sampler_settings:
 256                                         raise Exception("Material {} has conflicting texture sampler settings".format(self.name))
 257
 258         def create_property(self, *args):
 259                 prop = None
 260                 if len(args)==1:
 261                         prop = MaterialProperty(None, args[0], None)
 262                 elif len(args)==2:
 263                         prop = MaterialProperty(args[0], args[0]+"_map", args[1])
 264                 else:
 265                         prop = MaterialProperty(*args)
 266                 self.properties.append(prop)
 267                 return prop
 268
 269
 270 class MaterialAtlas:
 271         def __init__(self, materials):
 272                 self.render_mode = materials[0].render_mode
 273                 if self.render_mode=='EXTERNAL':
 274                         raise Exception("Material atlas with external render mode does not make sense")
 275
 276                 if self.render_mode=='CUSTOM':
 277                         self.render_methods = materials[0].render_methods
 278                 else:
 279                         self.render_methods = None
 280                 if self.render_methods:
 281                         self.name = "material_atlas_"+os.path.splitext(self.render_methods[0].shader)[0]
 282                 else:
 283                         self.name = "material_atlas"
 284                 self.receive_shadows = materials[0].receive_shadows
 285                 self.cast_shadows = (materials[0].shadow_method!='NONE')
 286                 self.materials = materials
 287                 self.material_names = [m.name for m in self.materials]
 288                 self.uniforms = None
 289                 method_hash = compute_render_method_hash(self)
 290                 for m in self.materials:
 291                         if m.render_mode!=self.render_mode:
 292                                 raise Exception("Conflicting render modes in MaterialAtlas constructor")
 293                         if self.render_mode=='CUSTOM' and compute_render_method_hash(m)!=method_hash:
 294                                 raise Exception("Conflicting shaders in MaterialAtlas constructor")
 295                         if m.receive_shadows!=self.receive_shadows or m.shadow_method!=materials[0].shadow_method:
 296                                 raise Exception("Conflicting shadow settings in MaterialAtlas constructor")
 297
 298                 count = len(self.materials)
 299                 size = 1
 300                 while size*size*2<count:
 301                         size *= 2
 302                 if size*size>=count:
 303                         self.size = (size, size)
 304                 else:
 305                         self.size = (size*2, size)
 306
 307                 from .util import get_colormap
 308
 309                 cm = get_colormap(True)
 310                 self.base_color_data = ""
 311                 for m in map(Material, self.materials):
 312                         if any(p.texture for p in m.properties):
 313                                 raise Exception("Texturing is incompatible with material atlas")
 314                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 315                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 316                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 317
 318         def get_material_uv(self, material):
 319                 index = self.material_names.index(material.name)
 320                 x = index%self.size[0]
 321                 y = index//self.size[0]
 322                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 323
 324 def create_material_atlas(context, material):
 325         if not material.material_atlas:
 326                 raise Exception("Material is not part of a material atlas")
 327
 328         method_hash = compute_render_method_hash(material)
 329         materials = []
 330         for m in context.blend_data.materials:
 331                 if m.material_atlas and compute_render_method_hash(m)==method_hash:
 332                         materials.append(m)
 333
 334         return MaterialAtlas(materials)