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 def get_unlit_inputs(node_tree, node):
  43         if node.type=='GROUP':
  44                 return check_group(node_tree, node, get_unlit_inputs)
  45         elif node.type=='MIX_SHADER':
  46                 from .util import get_linked_node_and_socket
  47
  48                 shader1, _ = get_linked_node_and_socket(node_tree, node.inputs[1])
  49                 shader2, _ = get_linked_node_and_socket(node_tree, node.inputs[2])
  50                 if shader1.type=='BSDF_TRANSPARENT' and shader2.type=='EMISSION':
  51                         factor_input = node.inputs["Fac"]
  52                         factor_from, _ = get_linked_node_and_socket(node_tree, factor_input)
  53                         color_input = shader2.inputs["Color"]
  54                         color_from, _ = get_linked_node_and_socket(node_tree, color_input)
  55                         if factor_from==color_from:
  56                                 return (color_input, factor_input)
  57         elif node.type=='EMISSION':
  58                 return (node.inputs["Color"], None)
  59         return (None, None)
  60
  61 class MaterialProperty:
  62         def __init__(self, keyword, tex_keyword, value):
  63                 self.keyword = keyword
  64                 self.tex_keyword = tex_keyword
  65                 self.value = value
  66                 self.texture = None
  67                 self.tex_usage = None
  68                 self.invert_green = False
  69
  70         def set_from_input(self, node_tree, input_socket, alpha_socket=None):
  71                 if self.keyword:
  72                         if type(self.value)==tuple:
  73                                 if alpha_socket:
  74                                         self.value = input_socket.default_value[:len(self.value)-1]+(alpha_socket.default_value,)
  75                                 else:
  76                                         self.value = input_socket.default_value[:len(self.value)]
  77                         else:
  78                                 self.value = input_socket.default_value
  79
  80                 if self.tex_keyword:
  81                         from .util import get_linked_node_and_socket
  82
  83                         from_node, _ = get_linked_node_and_socket(node_tree, input_socket)
  84                         alpha_from = None
  85                         if from_node:
  86                                 usage = None
  87                                 if from_node.type=='NORMAL_MAP':
  88                                         from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
  89                                         invert, _ = check_invert_green(node_tree, from_node)
  90                                         if invert:
  91                                                 from_node = invert
  92                                                 self.invert_green = True
  93                                         usage = 'RGB'
  94                                 elif from_node.type=='RGBTOBW':
  95                                         from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
  96
  97                                 if alpha_socket:
  98                                         alpha_from, _ = get_linked_node_and_socket(node_tree, alpha_socket)
  99                                         if alpha_from and alpha_from!=from_node:
 100                                                 raise Exception("Separate textures for color and alpha are not supported")
 101
 102                                 if from_node.type=='TEX_IMAGE':
 103                                         self.texture = from_node
 104                                         if usage:
 105                                                 self.tex_usage = usage
 106                                         elif alpha_from:
 107                                                 self.tex_usage = 'RGBA'
 108                                         elif type(self.value)==tuple:
 109                                                 self.tex_usage = 'RGB'
 110                                         else:
 111                                                 self.tex_usage = 'GRAY'
 112                                 else:
 113                                         raise Exception("Unsupported property input node type "+from_node.type)
 114
 115 class Material:
 116         def __init__(self, material):
 117                 self.name = material.name
 118                 self.type = None
 119                 self.properties = []
 120
 121                 self.render_mode = material.render_mode
 122                 self.technique = material.technique
 123                 self.render_methods = material.render_methods[:]
 124                 self.receive_shadows = material.receive_shadows
 125                 self.cast_shadows = (material.shadow_method!='NONE')
 126                 self.image_based_lighting = material.image_based_lighting
 127
 128                 if self.render_mode=='EXTERNAL' and not self.technique:
 129                         raise Exception("Invalid configuration on material {}: No technique for external rendering".format(self.name))
 130                 elif self.render_mode=='CUSTOM' and not self.render_methods:
 131                         raise Exception("Invalid configuration on material {}: No render methods for custom rendering".format(self.name))
 132
 133                 out_node = next((n for n in material.node_tree.nodes if n.type=='OUTPUT_MATERIAL'), None)
 134                 if not out_node:
 135                         raise Exception("No output node found on material {}".format(self.name))
 136
 137                 from .util import get_linked_node_and_socket
 138
 139                 surface_node, _ = get_linked_node_and_socket(material.node_tree, out_node.inputs["Surface"])
 140                 if not surface_node:
 141                         if self.render_mode=='BUILTIN':
 142                                 raise Exception("Invalid configuration on material {}: Empty material with builtin rendering".format(self.name))
 143                         return
 144                 elif surface_node.type=='BSDF_PRINCIPLED':
 145                         self.type = "pbr"
 146
 147                         base_color = self.create_property("base_color", (0.8, 0.8, 0.8, 1.0))
 148                         metalness = self.create_property("metalness", 0.0)
 149                         roughness = self.create_property("roughness", 0.5)
 150                         normal = self.create_property("normal_map")
 151                         emission = self.create_property("emission", (0.0, 0.0, 0.0))
 152
 153                         base_color.set_from_input(material.node_tree, surface_node.inputs["Base Color"], surface_node.inputs["Alpha"])
 154                         metalness.set_from_input(material.node_tree, surface_node.inputs["Metallic"])
 155                         roughness.set_from_input(material.node_tree, surface_node.inputs["Roughness"])
 156                         normal.set_from_input(material.node_tree, surface_node.inputs["Normal"])
 157                         emission.set_from_input(material.node_tree, surface_node.inputs["Emission"])
 158                 elif surface_node.type=='EMISSION' or surface_node.type=='MIX_SHADER':
 159                         color_input, alpha_input = get_unlit_inputs(material.node_tree, surface_node)
 160                         if not color_input:
 161                                 raise Exception("Unsupported configuration for unlit material {}".format(self.name))
 162
 163                         self.type = "unlit"
 164
 165                         color = self.create_property("color", "texture", (1.0, 1.0, 1.0, 1.0))
 166
 167                         color.set_from_input(material.node_tree, color_input, alpha_input)
 168                 else:
 169                         raise Exception("Unsupported surface node type {} on material {}".format(surface_node.type, self.name))
 170
 171                 sampler_settings = None
 172                 for p in self.properties:
 173                         if p.texture:
 174                                 settings = (p.texture.interpolation, p.texture.use_mipmap, p.texture.max_anisotropy)
 175                                 if sampler_settings is None:
 176                                         sampler_settings = settings
 177                                 elif settings!=sampler_settings:
 178                                         raise Exception("Material {} has conflicting texture sampler settings".format(self.name))
 179
 180         def create_property(self, *args):
 181                 prop = None
 182                 if len(args)==1:
 183                         prop = MaterialProperty(None, args[0], None)
 184                 elif len(args)==2:
 185                         prop = MaterialProperty(args[0], args[0]+"_map", args[1])
 186                 else:
 187                         prop = MaterialProperty(*args)
 188                 self.properties.append(prop)
 189                 return prop
 190
 191
 192 class MaterialAtlas:
 193         def __init__(self, materials):
 194                 self.render_mode = materials[0].render_mode
 195                 if self.render_mode=='EXTERNAL':
 196                         raise Exception("Material atlas with external render mode does not make sense")
 197
 198                 if self.render_mode=='CUSTOM':
 199                         self.render_methods = materials[0].render_methods
 200                 else:
 201                         self.render_methods = None
 202                 if self.render_methods:
 203                         self.name = "material_atlas_"+os.path.splitext(self.render_methods[0].shader)[0]
 204                 else:
 205                         self.name = "material_atlas"
 206                 self.receive_shadows = materials[0].receive_shadows
 207                 self.cast_shadows = (materials[0].shadow_method!='NONE')
 208                 self.materials = materials
 209                 self.material_names = [m.name for m in self.materials]
 210                 self.uniforms = None
 211                 method_hash = compute_render_method_hash(self)
 212                 for m in self.materials:
 213                         if m.render_mode!=self.render_mode:
 214                                 raise Exception("Conflicting render modes in MaterialAtlas constructor")
 215                         if self.render_mode=='CUSTOM' and compute_render_method_hash(m)!=method_hash:
 216                                 raise Exception("Conflicting shaders in MaterialAtlas constructor")
 217                         if m.receive_shadows!=self.receive_shadows or m.shadow_method!=materials[0].shadow_method:
 218                                 raise Exception("Conflicting shadow settings in MaterialAtlas constructor")
 219
 220                 count = len(self.materials)
 221                 size = 1
 222                 while size*size*2<count:
 223                         size *= 2
 224                 if size*size>=count:
 225                         self.size = (size, size)
 226                 else:
 227                         self.size = (size*2, size)
 228
 229                 from .util import get_colormap
 230
 231                 cm = get_colormap(True)
 232                 self.base_color_data = ""
 233                 for m in map(Material, self.materials):
 234                         if any(p.texture for p in m.properties):
 235                                 raise Exception("Texturing is incompatible with material atlas")
 236                         base_color = [int(cm(c)*255) for c in m.base_color.value]
 237                         self.base_color_data += "\\x{:02X}\\x{:02X}\\x{:02X}\\xFF".format(*base_color)
 238                 self.base_color_data += "\\x00\\x00\\x00\\x00"*(self.size[0]*self.size[1]-count)
 239
 240         def get_material_uv(self, material):
 241                 index = self.material_names.index(material.name)
 242                 x = index%self.size[0]
 243                 y = index//self.size[0]
 244                 return ((x+0.5)/self.size[0], (y+0.5)/self.size[1])
 245
 246 def create_material_atlas(context, material):
 247         if not material.material_atlas:
 248                 raise Exception("Material is not part of a material atlas")
 249
 250         method_hash = compute_render_method_hash(material)
 251         materials = []
 252         for m in context.blend_data.materials:
 253                 if m.material_atlas and compute_render_method_hash(m)==method_hash:
 254                         materials.append(m)
 255
 256         return MaterialAtlas(materials)