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 __init__(self):
  30                 self.inline_data = True
  31
  32         def export_texture(self, tex_node, usage='RGB', *, invert_green=False):
  33                 image = tex_node.image
  34                 from .datafile import Resource, Statement, Token
  35                 tex_res = Resource(image.name+".tex2d", "texture2d")
  36
  37                 if tex_node.use_mipmap:
  38                         tex_res.statements.append(Statement("generate_mipmap", True))
  39
  40                 colorspace = image.colorspace_settings.name
  41                 if usage=='GRAY' and colorspace=='sRGB':
  42                                 raise Exception("Grayscale textures with sRGB colorspace are not supported")
  43
  44                 from .util import basename
  45                 fn = basename(image.filepath)
  46                 if not self.inline_data and not invert_green and fn:
  47                         srgb = "_srgb" if colorspace=='sRGB' else ""
  48                         tex_res.statements.append(Statement("external_image"+srgb, fn))
  49                 else:
  50                         if usage=='RGBA':
  51                                 fmt = 'SRGB8_ALPHA8' if colorspace=='sRGB' else 'RGBA8'
  52                         elif usage=='GRAY':
  53                                 fmt = 'LUMINANCE8'
  54                         else:
  55                                 fmt = 'SRGB8' if colorspace=='sRGB' else 'RGB8'
  56
  57                         tex_res.statements.append(Statement("storage", Token(fmt), image.size[0], image.size[1]))
  58
  59                         pixels = tuple(image.pixels)
  60                         texdata = ""
  61                         if usage=='RGBA':
  62                                 texdata = encode_pixels(pixels_to_rgba(pixels))
  63                         elif usage=='GRAY':
  64                                 texdata = encode_pixels(pixels_to_gray(pixels))
  65                         elif invert_green:
  66                                 texdata = encode_pixels(pixels_to_rgb_invert_green(pixels))
  67                         else:
  68                                 texdata = encode_pixels(pixels_to_rgb(pixels))
  69                         tex_res.statements.append(Statement("raw_data", texdata))
  70
  71                 return tex_res
  72
  73 class SamplerExporter:
  74         def export_sampler(self, tex_node):
  75                 from .datafile import Resource, Statement, Token
  76                 samp_res = Resource(self.get_sampler_name(tex_node), "sampler")
  77
  78                 use_interpolation = tex_node.interpolation!='Closest'
  79                 if use_interpolation:
  80                         if tex_node.use_mipmap:
  81                                 samp_res.statements.append(Statement("filter", Token('LINEAR_MIPMAP_LINEAR')))
  82                         else:
  83                                 samp_res.statements.append(Statement("filter", Token('LINEAR')))
  84                         samp_res.statements.append(Statement("max_anisotropy", tex_node.max_anisotropy))
  85                 else:
  86                         if tex_node.use_mipmap:
  87                                 samp_res.statements.append(Statement("filter", Token('NEAREST_MIPMAP_NEAREST')))
  88                         else:
  89                                 samp_res.statements.append(Statement("filter", Token('NEAREST')))
  90
  91                 if tex_node.extension=="REPEAT":
  92                         samp_res.statements.append(Statement("wrap", Token('REPEAT')))
  93                 elif tex_node.extension=="EXTEND":
  94                         samp_res.statements.append(Statement("wrap", Token('CLAMP_TO_EDGE')))
  95                 elif tex_node.extension=="CLIP":
  96                         samp_res.statements.append(Statement("wrap", Token('CLAMP_TO_BORDER')))
  97                         samp_res.statements.append(Statement("border_color", 0.0, 0.0, 0.0, 0.0))
  98
  99                 return samp_res
 100
 101         def get_sampler_name(self, tex_node):
 102                 name_parts = []
 103
 104                 use_interpolation = tex_node.interpolation!='Closest'
 105                 name_parts.append("linear" if use_interpolation else "nearest")
 106                 if tex_node.use_mipmap:
 107                         name_parts.append("mip")
 108                 if use_interpolation and tex_node.max_anisotropy>1:
 109                         name_parts.append("aniso{:g}x".format(tex_node.max_anisotropy))
 110                 if tex_node.extension!="REPEAT":
 111                         name_parts.append("clip" if tex_node.extension=="CLIP" else "clamp")
 112
 113                 return "_".join(name_parts)+".samp"