Handle certain shader graph patterns that occur in imported glTF files

[libs/gl.git] / blender / io_mspgl / export_texture.py

diff --git a/blender/io_mspgl/export_texture.py b/blender/io_mspgl/export_texture.py
index 3194edae8e53e1a407acac8073327ba818e52bdd..2860d461d8874efd708b3e424332dbd42aaf2da3 100644 (file)
--- a/blender/io_mspgl/export_texture.py
+++ b/blender/io_mspgl/export_texture.py
@@ -23,11 +23,15 @@ def pixels_to_gray(pixels):
        for i in range(0, len(pixels), 4):
                yield int((pixels[i]+pixels[i+1]+pixels[i+2])*255/3)
 
+def pixels_to_single_channel(pixels, channel):
+       for i in range(0, len(pixels), 4):
+               yield int(pixels[i+channel]*255)
+
 class TextureExporter:
        def export_texture(self, tex_node, channels=['R', 'G', 'B']):
                image = tex_node.image
                from .datafile import RawData, Resource, Statement, Token
-               tex_res = Resource(image.name+".tex", "texture")
+               tex_res = Resource(self.get_texture_name(tex_node, channels), "texture")
 
                tex_res.statements.append(Statement("type", Token("\\2d")))
 
@@ -41,7 +45,20 @@ class TextureExporter:
                invert_mask = sum(1<<i for i, c in enumerate(channels) if c[0]=='~')
 
                fn = bpy.path.basename(image.filepath)
-               if not invert_mask and fn:
+               native_channels = None
+               if fn:
+                       abs_path = bpy.path.abspath(image.filepath) 
+                       if os.path.exists(abs_path):
+                               import imbuf
+                               native_bpp = imbuf.load(bpy.path.abspath(image.filepath)).planes
+                               if native_bpp==32:
+                                       native_channels = ['R', 'G', 'B', 'A']
+                               elif native_bpp==24:
+                                       native_channels = ['R', 'G', 'B']
+                               elif native_bpp==8:
+                                       native_channels = ['Y']
+
+               if not invert_mask and channels==native_channels:
                        if not tex_node.use_mipmap:
                                tex_res.statements.append(Statement("mipmap_levels", 1))
                        srgb = "_srgb" if colorspace=='sRGB' else ""
@@ -61,17 +78,26 @@ class TextureExporter:
                        if len(channels)==4:
                                texdata = pixels_to_rgba(pixels)
                        elif len(channels)==1:
-                               texdata = pixels_to_gray(pixels)
+                               if channels[0]=='Y':
+                                       texdata = pixels_to_gray(pixels)
+                               else:
+                                       texdata = pixels_to_single_channel(pixels, "RGBA".index(channels[0]))
                        elif invert_mask:
                                texdata = pixels_to_rgb_invert(pixels, invert_mask)
                        else:
                                texdata = pixels_to_rgb(pixels)
 
-                       data = RawData(image.name+".mdr", bytes(texdata))
+                       data = RawData(os.path.splitext(tex_res.name)[0]+".mdr", bytes(texdata))
                        tex_res.statements.append(tex_res.create_reference_statement("external_data", data))
 
                return tex_res
 
+       def get_texture_name(self, tex_node, channels):
+               image_name = tex_node.image.name
+               if len(channels)==1 and channels[0]!='Y':
+                       image_name += "_"+channels[0]
+               return image_name+".tex"
+
 class SamplerExporter:
        def export_sampler(self, tex_node):
                from .datafile import Resource, Statement, Token