Recognize a certain configuration of nodes as inverting Y for normals

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

diff --git a/blender/io_mspgl/material.py b/blender/io_mspgl/material.py
index e69cab844e3f2aa7cb4649eca55e2291e3da922f..cadfe75e09b5ef4589da97a5e99c8caec34e3538 100644 (file)
--- a/blender/io_mspgl/material.py
+++ b/blender/io_mspgl/material.py
@@ -8,6 +8,33 @@ def get_linked_node_and_socket(node_tree, socket):
                        return (l.to_node, l.to_socket)
        return (None, None)
 
+def check_group(node_tree, group, func):
+       output = group.node_tree.nodes["Group Output"]
+       from_node, _ = get_linked_node_and_socket(group.node_tree, output.inputs[0])
+       if from_node:
+               from_node, _ = func(group.node_tree, from_node)
+               if from_node and from_node.type=='GROUP_INPUT':
+                       return get_linked_node_and_socket(node_tree, group.inputs[0])
+       return (None, None)
+
+def check_invert_green(node_tree, node):
+       if node.type=='GROUP':
+               return check_group(node_tree, node, check_invert_green)
+       elif node.type!='COMBRGB':
+               return (None, None)
+
+       green, g_sock = get_linked_node_and_socket(node_tree, node.inputs["G"])
+       if not green or green.type!='MATH' or green.operation!='SUBTRACT':
+               return (None, None)
+       green, g_sock = get_linked_node_and_socket(node_tree, green.inputs[1])
+
+       red, r_sock = get_linked_node_and_socket(node_tree, node.inputs["R"])
+       blue, b_sock = get_linked_node_and_socket(node_tree, node.inputs["B"])
+       if not red or red.type!='SEPRGB' or blue!=red or green!=red:
+               return (None, None)
+
+       return get_linked_node_and_socket(node_tree, red.inputs["Image"])
+
 class MaterialProperty:
        def __init__(self, keyword, tex_keyword, value):
                self.keyword = keyword
@@ -15,6 +42,7 @@ class MaterialProperty:
                self.value = value
                self.texture = None
                self.tex_usage = None
+               self.invert_green = False
 
        def set_from_input(self, node_tree, input_socket, alpha_socket=None):
                if self.keyword:
@@ -33,6 +61,10 @@ class MaterialProperty:
                                usage = None
                                if from_node.type=='NORMAL_MAP':
                                        from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])
+                                       invert, _ = check_invert_green(node_tree, from_node)
+                                       if invert:
+                                               from_node = invert
+                                               self.invert_green = True
                                        usage = 'RGB'
                                elif from_node.type=='RGBTOBW':
                                        from_node, _ = get_linked_node_and_socket(node_tree, from_node.inputs["Color"])