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, g_sock = 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, g_sock = get_linked_node_and_socket(node_tree, green.inputs[1])
  34
  35         red, r_sock = get_linked_node_and_socket(node_tree, node.inputs["R"])
  36         blue, b_sock = 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 class MaterialProperty:
  43         def __init__(self, keyword, tex_keyword, value):
  44                 self.keyword = keyword
  45                 self.tex_keyword = tex_keyword
  46                 self.value = value
  47                 self.texture = None
  48                 self.tex_usage = None
  49                 self.invert_green = False
  50
  51         def set_from_input(self, node_tree, input_socket, alpha_socket=None):
  52                 if self.keyword:
  53                         if type(self.value)==tuple:
  54                                 if alpha_socket:
  55                                         self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
  56                                 else:
  57                                         self.value = input_socket.default_value[:len(self.value)]
  58                         else:
  59                                 self.value = input_socket.default_value
  60
  61                 if self.tex_keyword:
  62                         from .util import get_linked_node_and_socket
  63
  64                         from_node, _ = get_linked_node_and_socket(node_tree, input_socket)
  65                         alpha_from = None
  66                         if from_node:
  67                                 usage = None
  68                                 if from_node.type=='NORMAL_MAP':
  69                                         from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
  70                                         invert, _ = check_invert_green(node_tree, from_node)
  71                                         if invert:
  72                                                 from_node = invert
  73                                                 self.invert_green = True
  74                                         usage = 'RGB'
  75                                 elif from_node.type=='RGBTOBW':
  76                                         from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
  77
  78                                 if alpha_socket:
  79                                         alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
  80                                         if alpha_from and alpha_from!=from_node:
  81                                                 raise Exception("Separate textures for color and alpha are not supported")
  82
  83                                 if from_node.type=='TEX_IMAGE':
  84                                         self.texture = from_node
  85                                         if usage:
  86                                                 self.tex_usage = usage
  87                                         elif alpha_from:
  88                                                 self.tex_usage = 'RGBA'
  89                                         elif type(self.value)==tuple:
  90                                                 self.tex_usage = 'RGB'
  91                                         else:
  92                                                 self.tex_usage = 'GRAY'
  93                                 else:
  94                                         raise Exception("Unsupported property input node type "+from_node.type)
  95
  96 class Material:
  97         def __init__(self, material):
  98                 self.name = material.name
  99                 self.type = None
 100                 self.properties = []
 101
 102                 self.render_mode = material.render_mode
 103                 self.technique = material.technique
 104                 self.render_methods = material.render_methods[:]
 105                 self.receive_shadows = material.receive_shadows
 106                 self.cast_shadows = (material.shadow_method!='NONE')
 107                 self.image_based_lighting = material.image_based_lighting
 108
 109                 if self.render_mode=='EXTERNAL' and not self.technique:
 110                         raise Exception("Invalid configuration on material {}: No technique for external rendering".format(self.name))
 111                 elif self.render_mode=='CUSTOM' and not self.render_methods:
 112                         raise Exception("Invalid configuration on material {}: No render methods for custom rendering".format(self.name))
 113
 114                 out_node = next((n for n in material.node_tree.nodes if n.type=='OUTPUT_MATERIAL'), None)
 115                 if not out_node:
 116                         raise Exception("No output node found on material {}".format(self.name))
 117
 118                 from .util import get_linked_node_and_socket
 119
 120                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
 121                 if not surface_node:
 122                         if self.render_mode=='BUILTIN':
 123                                 raise Exception("Invalid configuration on material {}: Empty material with builtin rendering".format(self.name))
 124                         return
 125                 elif surface_node.type=='BSDF_PRINCIPLED':
 126                         self.type = "pbr"
 127
 128                         base_color = self.create_property("base_color", (0.8, 0.8, 0.8, 1.0))
 129                         metalness = self.create_property("metalness", 0.0)
 130                         roughness = self.create_property("roughness", 0.5)
 131                         normal = self.create_property("normal_map")
 132                         emission = self.create_property("emission", (0.0, 0.0, 0.0))
 133
 134                         base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
 135                         metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
 136                         roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
 137                         normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
 138                         emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
 139                 elif surface_node.type=='EMISSION':
 140                         self.type = "unlit"
 141
 142                         color = self.create_property("color", "texture", (1.0, 1.0, 1.0, 1.0))
 143
 144                         color.set_from_input(material.node_tree, surface_node.inputs["Color"])
 145                 else:
 146                         raise Exception("Unsupported surface node type {} on material {}".format(surface_node.type, self.name))
 147
 148                 sampler_settings = None
 149                 for p in self.properties:
 150                         if p.texture:
 151                                 settings = (p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
 152                                 if sampler_settings is None:
 153                                         sampler_settings = settings
 154                                 elif settings!=sampler_settings:
 155                                         raise Exception("Material {} has conflicting texture sampler settings".format(self.name))
 156
 157         def create_property(self, *args):
 158                 prop = None
 159                 if len(args)==1:
 160                         prop = MaterialProperty(None, args[0], None)
 161                 elif len(args)==2:
 162                         prop = MaterialProperty(args[0], args[0]+"_map", args[1])
 163                 else:
 164                         prop = MaterialProperty(*args)
 165                 self.properties.append(prop)
 166                 return prop
 167
 168
 169 class MaterialAtlas:
 170         def __init__(self, materials):
 171                 self.render_mode = materials[0].render_mode
 172                 if self.render_mode=='EXTERNAL':
 173                         raise Exception("Material atlas with external render mode does not make sense")
 174
 175                 if self.render_mode=='CUSTOM':
 176                         self.render_methods = materials[0].render_methods
 177                 else:
 178                         self.render_methods = None
 179                 if self.render_methods:
 180                         self.name = "material_atlas_"+os.path.splitext(self.render_methods[0].shader)[0]
 181                 else:
 182                         self.name = "material_atlas"
 183                 self.receive_shadows = materials[0].receive_shadows
 184                 self.cast_shadows = (materials[0].shadow_method!='NONE')
 185                 self.materials = materials
 186                 self.material_names = [m.name for m in self.materials]
 187                 self.uniforms = None
 188                 method_hash = compute_render_method_hash(self)
 189                 for m in self.materials:
 190                         if m.render_mode!=self.render_mode:
 191                                 raise Exception("Conflicting render modes in MaterialAtlas constructor")
 192                         if self.render_mode=='CUSTOM' and compute_render_method_hash(m)!=method_hash:
 193                                 raise Exception("Conflicting shaders in MaterialAtlas constructor")
 194                         if m.receive_shadows!=self.receive_shadows or m.shadow_method!=materials[0].shadow_method:
 195                                 raise Exception("Conflicting shadow settings in MaterialAtlas constructor")
 196
 197                 count = len(self.materials)
 198                 size = 1
 199                 while size*size*2<count:
 200                         size *= 2
 201                 if size*size>=count:
 202                         self.size = (size, size)
 203                 else:
 204                         self.size = (size*2, size)
 205
 206                 from .util import get_colormap
 207
 208                 cm = get_colormap(True)
 209                 self.base_color_data = ""
 210                 for m in map(Material, self.materials):
 211                         if any(p.texture for p in m.properties):
 212                                 raise Exception("Texturing is incompatible with material atlas")
 213                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 214                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 215                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 216
 217         def get_material_uv(self, material):
 218                 index = self.material_names.index(material.name)
 219                 x = index%self.size[0]
 220                 y = index//self.size[0]
 221                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 222
 223 def create_material_atlas(context, material):
 224         if not material.material_atlas:
 225                 raise Exception("Material is not part of a material atlas")
 226
 227         method_hash = compute_render_method_hash(material)
 228         materials = []
 229         for m in context.blend_data.materials:
 230                 if m.material_atlas and compute_render_method_hash(m)==method_hash:
 231                         materials.append(m)
 232
 233         return MaterialAtlas(materials)