blender/io_mspgl/export_texture.py

   1 import os
   2 import base64
   3 import codecs
   4
   5 def encode_pixels(pixels):
   6         from .datafile import Token
   7         return Token(codecs.decode(b"="+base64.b64encode(bytes(pixels))+b"=", "ascii"))
   8
   9 def pixels_to_rgba(pixels):
  10         return (int(p*255) for p in pixels)
  11
  12 def pixels_to_rgb(pixels):
  13         for i in range(0, len(pixels), 4):
  14                 yield int(pixels[i]*255)
  15                 yield int(pixels[i+1]*255)
  16                 yield int(pixels[i+2]*255)
  17
  18 def pixels_to_rgb_invert_green(pixels):
  19         for i in range(0, len(pixels), 4):
  20                 yield int(pixels[i]*255)
  21                 yield 255-int(pixels[i+1]*255)
  22                 yield int(pixels[i+2]*255)
  23
  24 def pixels_to_gray(pixels):
  25         for i in range(0, len(pixels), 4):
  26                 yield int((pixels[i]+pixels[i+1]+pixels[i+2])*255/3)
  27
  28 class TextureExporter:
  29         def export_texture(self, tex_node, usage='RGB', *, invert_green=False):
  30                 image = tex_node.image
  31                 from .datafile import Resource, Statement, Token
  32                 tex_res = Resource(image.name+".tex", "texture")
  33
  34                 tex_res.statements.append(Statement("type", Token("\\2d")))
  35
  36                 if tex_node.use_mipmap:
  37                         tex_res.statements.append(Statement("generate_mipmap", True))
  38
  39                 colorspace = image.colorspace_settings.name
  40                 if usage=='GRAY' and colorspace=='sRGB':
  41                         raise Exception("Unsupported configuration on texture {}: Grayscale with sRGB".format(image.name))
  42
  43                 from .util import basename
  44                 fn = basename(image.filepath)
  45                 if not invert_green and fn:
  46                         srgb = "_srgb" if colorspace=='sRGB' else ""
  47                         tex_res.statements.append(Statement("external_image"+srgb, fn))
  48                 else:
  49                         if usage=='RGBA':
  50                                 fmt = 'SRGB8_ALPHA8' if colorspace=='sRGB' else 'RGBA8'
  51                         elif usage=='GRAY':
  52                                 fmt = 'LUMINANCE8'
  53                         else:
  54                                 fmt = 'SRGB8' if colorspace=='sRGB' else 'RGB8'
  55
  56                         tex_res.statements.append(Statement("storage", Token(fmt), image.size[0], image.size[1]))
  57
  58                         pixels = tuple(image.pixels)
  59                         texdata = ""
  60                         if usage=='RGBA':
  61                                 texdata = encode_pixels(pixels_to_rgba(pixels))
  62                         elif usage=='GRAY':
  63                                 texdata = encode_pixels(pixels_to_gray(pixels))
  64                         elif invert_green:
  65                                 texdata = encode_pixels(pixels_to_rgb_invert_green(pixels))
  66                         else:
  67                                 texdata = encode_pixels(pixels_to_rgb(pixels))
  68                         tex_res.statements.append(Statement("raw_data", texdata))
  69
  70                 return tex_res
  71
  72 class SamplerExporter:
  73         def export_sampler(self, tex_node):
  74                 from .datafile import Resource, Statement, Token
  75                 samp_res = Resource(self.get_sampler_name(tex_node), "sampler")
  76
  77                 use_interpolation = tex_node.interpolation!='Closest'
  78                 if use_interpolation:
  79                         if tex_node.use_mipmap:
  80                                 samp_res.statements.append(Statement("filter", Token('LINEAR_MIPMAP_LINEAR')))
  81                         else:
  82                                 samp_res.statements.append(Statement("filter", Token('LINEAR')))
  83                         samp_res.statements.append(Statement("max_anisotropy", tex_node.max_anisotropy))
  84                 else:
  85                         if tex_node.use_mipmap:
  86                                 samp_res.statements.append(Statement("filter", Token('NEAREST_MIPMAP_NEAREST')))
  87                         else:
  88                                 samp_res.statements.append(Statement("filter", Token('NEAREST')))
  89
  90                 if tex_node.extension=="REPEAT":
  91                         samp_res.statements.append(Statement("wrap", Token('REPEAT')))
  92                 elif tex_node.extension=="EXTEND":
  93                         samp_res.statements.append(Statement("wrap", Token('CLAMP_TO_EDGE')))
  94                 elif tex_node.extension=="CLIP":
  95                         samp_res.statements.append(Statement("wrap", Token('CLAMP_TO_BORDER')))
  96                         samp_res.statements.append(Statement("border_color", 0.0, 0.0, 0.0, 0.0))
  97
  98                 return samp_res
  99
 100         def get_sampler_name(self, tex_node):
 101                 name_parts = []
 102
 103                 use_interpolation = tex_node.interpolation!='Closest'
 104                 name_parts.append("linear" if use_interpolation else "nearest")
 105                 if tex_node.use_mipmap:
 106                         name_parts.append("mip")
 107                 if use_interpolation and tex_node.max_anisotropy>1:
 108                         name_parts.append("aniso{:g}x".format(tex_node.max_anisotropy))
 109                 if tex_node.extension!="REPEAT":
 110                         name_parts.append("clip" if tex_node.extension=="CLIP" else "clamp")
 111
 112                 return "_".join(name_parts)+".samp"