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+".tex2d", "texture2d")
  33
  34                 if tex_node.use_mipmap:
  35                         tex_res.statements.append(Statement("generate_mipmap", True))
  36
  37                 colorspace = image.colorspace_settings.name
  38                 if usage=='GRAY' and colorspace=='sRGB':
  39                         raise Exception("Unsupported configuration on texture {}: Grayscale with sRGB".format(image.name))
  40
  41                 from .util import basename
  42                 fn = basename(image.filepath)
  43                 if not invert_green and fn:
  44                         srgb = "_srgb" if colorspace=='sRGB' else ""
  45                         tex_res.statements.append(Statement("external_image"+srgb, fn))
  46                 else:
  47                         if usage=='RGBA':
  48                                 fmt = 'SRGB8_ALPHA8' if colorspace=='sRGB' else 'RGBA8'
  49                         elif usage=='GRAY':
  50                                 fmt = 'LUMINANCE8'
  51                         else:
  52                                 fmt = 'SRGB8' if colorspace=='sRGB' else 'RGB8'
  53
  54                         tex_res.statements.append(Statement("storage", Token(fmt), image.size[0], image.size[1]))
  55
  56                         pixels = tuple(image.pixels)
  57                         texdata = ""
  58                         if usage=='RGBA':
  59                                 texdata = encode_pixels(pixels_to_rgba(pixels))
  60                         elif usage=='GRAY':
  61                                 texdata = encode_pixels(pixels_to_gray(pixels))
  62                         elif invert_green:
  63                                 texdata = encode_pixels(pixels_to_rgb_invert_green(pixels))
  64                         else:
  65                                 texdata = encode_pixels(pixels_to_rgb(pixels))
  66                         tex_res.statements.append(Statement("raw_data", texdata))
  67
  68                 return tex_res
  69
  70 class SamplerExporter:
  71         def export_sampler(self, tex_node):
  72                 from .datafile import Resource, Statement, Token
  73                 samp_res = Resource(self.get_sampler_name(tex_node), "sampler")
  74
  75                 use_interpolation = tex_node.interpolation!='Closest'
  76                 if use_interpolation:
  77                         if tex_node.use_mipmap:
  78                                 samp_res.statements.append(Statement("filter", Token('LINEAR_MIPMAP_LINEAR')))
  79                         else:
  80                                 samp_res.statements.append(Statement("filter", Token('LINEAR')))
  81                         samp_res.statements.append(Statement("max_anisotropy", tex_node.max_anisotropy))
  82                 else:
  83                         if tex_node.use_mipmap:
  84                                 samp_res.statements.append(Statement("filter", Token('NEAREST_MIPMAP_NEAREST')))
  85                         else:
  86                                 samp_res.statements.append(Statement("filter", Token('NEAREST')))
  87
  88                 if tex_node.extension=="REPEAT":
  89                         samp_res.statements.append(Statement("wrap", Token('REPEAT')))
  90                 elif tex_node.extension=="EXTEND":
  91                         samp_res.statements.append(Statement("wrap", Token('CLAMP_TO_EDGE')))
  92                 elif tex_node.extension=="CLIP":
  93                         samp_res.statements.append(Statement("wrap", Token('CLAMP_TO_BORDER')))
  94                         samp_res.statements.append(Statement("border_color", 0.0, 0.0, 0.0, 0.0))
  95
  96                 return samp_res
  97
  98         def get_sampler_name(self, tex_node):
  99                 name_parts = []
 100
 101                 use_interpolation = tex_node.interpolation!='Closest'
 102                 name_parts.append("linear" if use_interpolation else "nearest")
 103                 if tex_node.use_mipmap:
 104                         name_parts.append("mip")
 105                 if use_interpolation and tex_node.max_anisotropy>1:
 106                         name_parts.append("aniso{:g}x".format(tex_node.max_anisotropy))
 107                 if tex_node.extension!="REPEAT":
 108                         name_parts.append("clip" if tex_node.extension=="CLIP" else "clamp")
 109
 110                 return "_".join(name_parts)+".samp"