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