blender/io_mspgl/export_material.py

   1 import itertools
   2
   3 class MaterialExporter:
   4         def export_technique_resources(self, ctx, material, resources):
   5                 from .export_texture import SamplerExporter, TextureExporter
   6                 texture_export = TextureExporter()
   7                 sampler_export = SamplerExporter()
   8
   9                 from .material import Material
  10                 if type(material)!=Material:
  11                         material = Material(material)
  12
  13                 textured_props = [p for p in itertools.chain(material.properties, *(s.properties for s in material.sub_materials)) if p.texture]
  14
  15                 ctx.set_slices(len(textured_props)+1)
  16                 for p in textured_props:
  17                         ctx.next_slice(p.texture.image)
  18
  19                         tex_name = texture_export.get_texture_name(p.texture, p.tex_channels)
  20                         if tex_name not in resources:
  21                                 resources[tex_name] = texture_export.export_texture(p.texture, p.tex_channels)
  22
  23                         samp_name = sampler_export.get_sampler_name(p.texture)
  24                         if samp_name not in resources:
  25                                 resources[samp_name] = sampler_export.export_sampler(p.texture)
  26
  27                 ctx.next_slice(material)
  28                 mat_name = material.name+".mat"
  29                 if mat_name not in resources:
  30                         if material.type:
  31                                 resources[mat_name] = self.export_material(material, resources)
  32                         else:
  33                                 resources[mat_name] = None
  34
  35                 for thsm in (False, True):
  36                         occluder_variant, occluder_spec_values = self.get_occluder_shader_variant(material, thsm)
  37                         if occluder_spec_values:
  38                                 base_variant = "_thsm" if thsm else ""
  39                                 shader_name = "occluder{}.shader".format(occluder_variant)
  40                                 if shader_name not in resources:
  41                                         resources[shader_name] = self.export_shader(shader_name, "occluder{}.glsl".format(base_variant), occluder_spec_values, resources)
  42
  43         def export_technique(self, material, resources):
  44                 from .material import Material
  45                 if type(material)!=Material:
  46                         material = Material(material)
  47
  48                 from .datafile import Resource, Statement, Token
  49                 tech_res = Resource(material.name+".tech", "technique")
  50
  51                 mat_res = resources[material.name+".mat"]
  52
  53                 blend_st = None
  54                 if material.blend_type=='ALPHA':
  55                         blend_st = Statement("blend", Token("SRC_ALPHA"), Token("ONE_MINUS_SRC_ALPHA"))
  56                 elif material.blend_type=='ADDITIVE':
  57                         blend_st = Statement("blend", Token("ONE"), Token("ONE"))
  58                 elif material.blend_type=='ADDITIVE_ALPHA':
  59                         blend_st = Statement("blend", Token("SRC_ALPHA"), Token("ONE"))
  60
  61                 if material.render_mode=='CUSTOM':
  62                         for m in material.render_methods:
  63                                 st = Statement("method", m.tag)
  64                                 if mat_res and m.use_material:
  65                                         st.sub.append(tech_res.create_reference_statement("material", mat_res))
  66
  67                                 if m.tag=="blended" and blend_st:
  68                                         st.sub.append(blend_st)
  69
  70                                 shader = m.shader
  71                                 if shader.endswith(".glsl"):
  72                                         shader += ".shader"
  73                                 st.sub.append(Statement("shader", shader))
  74
  75                                 if material.uniforms:
  76                                         ss = Statement("uniforms")
  77                                         for u in material.uniforms:
  78                                                 ss.sub.append(Statement("uniform", u.name, *u.values[:u.size]))
  79                                         st.sub.append(ss)
  80
  81                                 if material.face_cull=='BACK':
  82                                         st.sub.append(Statement("face_cull", Token("CULL_BACK")))
  83
  84                                 tech_res.statements.append(st)
  85                 else:
  86                         base_method = "blended" if material.blend_type!='NONE' else ""
  87                         st = Statement("method", base_method)
  88                         if mat_res:
  89                                 st.sub.append(tech_res.create_embed_statement("material", mat_res))
  90
  91                         if blend_st:
  92                                 st.sub.append(blend_st)
  93                         elif material.alpha_cutoff>0.0:
  94                                 ss = Statement("blend")
  95                                 ss.sub.append(Statement("alpha_to_coverage", True))
  96                                 st.sub.append(ss)
  97                         if material.receive_shadows:
  98                                 st.sub.append(Statement("receive_shadows", True))
  99                         if material.image_based_lighting:
 100                                 st.sub.append(Statement("image_based_lighting", True))
 101                         if material.instancing:
 102                                 st.sub.append(Statement("instancing", True))
 103                         if material.face_cull=='BACK':
 104                                 st.sub.append(Statement("face_cull", Token("CULL_BACK")))
 105
 106                         tech_res.statements.append(st)
 107
 108                         if material.cast_shadows:
 109                                 tech_res.statements.append(self.create_shadow_method(tech_res, material, resources, False));
 110                                 tech_res.statements.append(self.create_shadow_method(tech_res, material, resources, True));
 111
 112                 return tech_res
 113
 114         def create_shadow_method(self, tech_res, material, resources, thsm):
 115                 from .datafile import Statement, Token
 116
 117                 occluder_variant, occluder_spec_values = self.get_occluder_shader_variant(material, thsm)
 118
 119                 shader_stem = "occluder{}.shader" if occluder_spec_values else "occluder{}.glsl.shader"
 120                 shader_name = shader_stem.format(occluder_variant)
 121
 122                 st = Statement("method", "shadow"+("_thsm" if thsm else ""))
 123                 if occluder_spec_values:
 124                         st.sub.append(tech_res.create_reference_statement("shader", resources[shader_name]))
 125                 else:
 126                         st.sub.append(Statement("shader", shader_name))
 127
 128                 if occluder_spec_values.get("use_alpha_cutoff"):
 129                         ss = Statement("texture", "alpha_map")
 130
 131                         from .export_texture import TextureExporter
 132                         from .export_texture import SamplerExporter
 133                         texture_export = TextureExporter()
 134                         sampler_export = SamplerExporter()
 135
 136                         color_prop = material.properties[0]
 137                         tex_res = resources[texture_export.get_texture_name(color_prop.texture, color_prop.tex_channels)]
 138                         ss.sub.append(tech_res.create_reference_statement("texture", tex_res))
 139                         ss.sub.append(tech_res.create_reference_statement("sampler", resources[sampler_export.get_sampler_name(color_prop.texture)]))
 140                         st.sub.append(ss)
 141
 142                         ss = Statement("uniforms")
 143                         ss.sub.append(Statement("uniform", "alpha_cutoff", material.alpha_cutoff))
 144                         st.sub.append(ss)
 145
 146                 if material.face_cull=='BACK':
 147                         st.sub.append(Statement("face_cull", Token("CULL_BACK")))
 148
 149                 return st;
 150
 151         def get_occluder_shader_variant(self, material, thsm):
 152                 variant = ""
 153                 if thsm:
 154                         variant += "_thsm"
 155
 156                 spec_values = {}
 157
 158                 if material.cast_shadows and material.alpha_cutoff>0.0:
 159                         spec_values["use_alpha_cutoff"] = True
 160                         variant += "_masked"
 161                 if material.instancing:
 162                         spec_values["use_instancing"] = True
 163                         variant += "_instanced"
 164
 165                 return (variant, spec_values)
 166
 167         def export_material(self, material, resources):
 168                 from .datafile import Resource, Statement, Token
 169                 mat_res = Resource(material.name+".mat", "material")
 170
 171                 if material.type!="pbr" and material.type!="unlit" and material.type!="splat":
 172                         raise Exception("Can't export material {} of unknown type {}".format(material.name, material.type))
 173
 174                 mat_res.statements.append(Statement("type", Token(material.type)));
 175                 for p in material.properties:
 176                         st = self.create_property_statement(mat_res, p, resources)
 177                         if st:
 178                                 mat_res.statements.append(st)
 179
 180                 if material.sub_materials:
 181                         for k, s in material.array_storage.items():
 182                                 mat_res.statements.append(Statement(k.replace("_map", "_storage"), Token(s[0]), s[1], s[2]))
 183                         for s in material.sub_materials:
 184                                 st = Statement("sub")
 185                                 for p in s.properties:
 186                                         ss = self.create_property_statement(mat_res, p, resources, raw_texture=True)
 187                                         if ss:
 188                                                 st.sub.append(ss)
 189                                 mat_res.statements.append(st)
 190
 191                 textures = [p.texture for p in itertools.chain(material.properties, *(s.properties for s in material.sub_materials)) if p.texture]
 192                 if textures:
 193                         from .export_texture import SamplerExporter
 194                         sampler_export = SamplerExporter()
 195                         mat_res.statements.append(mat_res.create_reference_statement("sampler", resources[sampler_export.get_sampler_name(textures[0])]))
 196                 if material.alpha_cutoff>0.0:
 197                         mat_res.statements.append(Statement("alpha_cutoff", material.alpha_cutoff))
 198
 199                 return mat_res
 200
 201         def create_property_statement(self, mat_res, prop, resources, *, raw_texture=False):
 202                 from .datafile import Statement
 203                 if prop.texture:
 204                         from .export_texture import TextureExporter
 205                         texture_export = TextureExporter()
 206                         tex_res = resources[texture_export.get_texture_name(prop.texture, prop.tex_channels)]
 207                         if raw_texture:
 208                                 for s in tex_res.statements:
 209                                         if s.keyword.startswith("external_data"):
 210                                                 return mat_res.create_reference_statement(prop.tex_keyword, s.args[0])
 211                                         elif s.keyword.startswith("external_image"):
 212                                                 return Statement(prop.tex_keyword, s.args[0])
 213                         return mat_res.create_reference_statement(prop.tex_keyword, tex_res)
 214                 elif not prop.keyword:
 215                         return
 216                 elif type(prop.value)==tuple:
 217                         return Statement(prop.keyword, *prop.value)
 218                 else:
 219                         return Statement(prop.keyword, prop.value)
 220
 221         def export_shader(self, name, module, spec_values, resources):
 222                 from .datafile import Resource, Statement
 223                 shader_res = Resource(name, "shader")
 224
 225                 st = Statement("module", module)
 226                 for k, v in spec_values.items():
 227                         st.sub.append(Statement("specialize", k, v))
 228                 shader_res.statements.append(st)
 229
 230                 return shader_res