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