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# SPDX-License-Identifier: Apache-2.0
# Copyright 2018-2021 The glTF-Blender-IO authors.
import bpy
import typing
from io_scene_gltf2.blender.exp.gltf2_blender_gather_cache import cached
from io_scene_gltf2.io.com import gltf2_io
from io_scene_gltf2.blender.exp import gltf2_blender_gather_texture
from io_scene_gltf2.blender.exp import gltf2_blender_search_node_tree
from io_scene_gltf2.blender.exp import gltf2_blender_get
from io_scene_gltf2.blender.exp.gltf2_blender_get import previous_node
from io_scene_gltf2.blender.exp.gltf2_blender_gather_sampler import detect_manual_uv_wrapping
from io_scene_gltf2.io.com.gltf2_io_extensions import Extension
from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extensions
# blender_shader_sockets determine the texture and primary_socket determines
# the textransform and UVMap. Ex: when combining an ORM texture, for
# occlusion the primary_socket would be the occlusion socket, and
# blender_shader_sockets would be the (O,R,M) sockets.
def gather_texture_info(primary_socket, blender_shader_sockets, export_settings):
return __gather_texture_info_helper(primary_socket, blender_shader_sockets, 'DEFAULT', export_settings)
def gather_material_normal_texture_info_class(primary_socket, blender_shader_sockets, export_settings):
return __gather_texture_info_helper(primary_socket, blender_shader_sockets, 'NORMAL', export_settings)
def gather_material_occlusion_texture_info_class(primary_socket, blender_shader_sockets, export_settings):
return __gather_texture_info_helper(primary_socket, blender_shader_sockets, 'OCCLUSION', export_settings)
@cached
def __gather_texture_info_helper(
primary_socket: bpy.types.NodeSocket,
blender_shader_sockets: typing.Tuple[bpy.types.NodeSocket],
kind: str,
export_settings):
if not __filter_texture_info(primary_socket, blender_shader_sockets, export_settings):
return None, None
tex_transform, tex_coord, use_active_uvmap = __gather_texture_transform_and_tex_coord(primary_socket, export_settings)
fields = {
'extensions': __gather_extensions(tex_transform, export_settings),
'extras': __gather_extras(blender_shader_sockets, export_settings),
'index': __gather_index(blender_shader_sockets, export_settings),
'tex_coord': tex_coord
}
if kind == 'DEFAULT':
texture_info = gltf2_io.TextureInfo(**fields)
elif kind == 'NORMAL':
fields['scale'] = __gather_normal_scale(primary_socket, export_settings)
texture_info = gltf2_io.MaterialNormalTextureInfoClass(**fields)
elif kind == 'OCCLUSION':
fields['strength'] = __gather_occlusion_strength(primary_socket, export_settings)
texture_info = gltf2_io.MaterialOcclusionTextureInfoClass(**fields)
if texture_info.index is None:
return None, None
export_user_extensions('gather_texture_info_hook', export_settings, texture_info, blender_shader_sockets)
return texture_info, use_active_uvmap
def __filter_texture_info(primary_socket, blender_shader_sockets, export_settings):
if primary_socket is None:
return False
if __get_tex_from_socket(primary_socket) is None:
return False
if not blender_shader_sockets:
return False
if not all([elem is not None for elem in blender_shader_sockets]):
return False
if any([__get_tex_from_socket(socket) is None for socket in blender_shader_sockets]):
# sockets do not lead to a texture --> discard
return False
return True
def __gather_extensions(texture_transform, export_settings):
if texture_transform is None:
return None
extension = Extension("KHR_texture_transform", texture_transform)
return {"KHR_texture_transform": extension}
def __gather_extras(blender_shader_sockets, export_settings):
return None
# MaterialNormalTextureInfo only
def __gather_normal_scale(primary_socket, export_settings):
result = gltf2_blender_search_node_tree.from_socket(
primary_socket,
gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeNormalMap))
if not result:
return None
strengthInput = result[0].shader_node.inputs['Strength']
if not strengthInput.is_linked and strengthInput.default_value != 1:
return strengthInput.default_value
return None
# MaterialOcclusionTextureInfo only
def __gather_occlusion_strength(primary_socket, export_settings):
# Look for a MixRGB node that mixes with pure white in front of
# primary_socket. The mix factor gives the occlusion strength.
node = gltf2_blender_get.previous_node(primary_socket)
if node and node.type == 'MIX_RGB' and node.blend_type == 'MIX':
fac = gltf2_blender_get.get_const_from_socket(node.inputs['Fac'], kind='VALUE')
col1 = gltf2_blender_get.get_const_from_socket(node.inputs['Color1'], kind='RGB')
col2 = gltf2_blender_get.get_const_from_socket(node.inputs['Color2'], kind='RGB')
if fac is not None:
if col1 == [1, 1, 1] and col2 is None:
return fac
if col1 is None and col2 == [1, 1, 1]:
return 1.0 - fac # reversed for reversed inputs
return None
def __gather_index(blender_shader_sockets, export_settings):
# We just put the actual shader into the 'index' member
return gltf2_blender_gather_texture.gather_texture(blender_shader_sockets, export_settings)
def __gather_texture_transform_and_tex_coord(primary_socket, export_settings):
# We're expecting
#
# [UV Map] => [Mapping] => [UV Wrapping] => [Texture Node] => ... => primary_socket
#
# The [UV Wrapping] is for wrap modes like MIRROR that use nodes,
# [Mapping] is for KHR_texture_transform, and [UV Map] is for texCoord.
blender_shader_node = __get_tex_from_socket(primary_socket).shader_node
# Skip over UV wrapping stuff (it goes in the sampler)
result = detect_manual_uv_wrapping(blender_shader_node)
if result:
node = previous_node(result['next_socket'])
else:
node = previous_node(blender_shader_node.inputs['Vector'])
texture_transform = None
if node and node.type == 'MAPPING':
texture_transform = gltf2_blender_get.get_texture_transform_from_mapping_node(node)
node = previous_node(node.inputs['Vector'])
texcoord_idx = 0
use_active_uvmap = True
if node and node.type == 'UVMAP' and node.uv_map:
# Try to gather map index.
for blender_mesh in bpy.data.meshes:
i = blender_mesh.uv_layers.find(node.uv_map)
if i >= 0:
texcoord_idx = i
use_active_uvmap = False
break
return texture_transform, texcoord_idx or None, use_active_uvmap
def __get_tex_from_socket(socket):
result = gltf2_blender_search_node_tree.from_socket(
socket,
gltf2_blender_search_node_tree.FilterByType(bpy.types.ShaderNodeTexImage))
if not result:
return None
if result[0].shader_node.image is None:
return None
return result[0]
def check_same_size_images(
blender_shader_sockets: typing.Tuple[bpy.types.NodeSocket],
) -> bool:
"""Check that all sockets leads to images of the same size."""
if not blender_shader_sockets or not all(blender_shader_sockets):
return False
sizes = set()
for socket in blender_shader_sockets:
tex = __get_tex_from_socket(socket)
if tex is None:
return False
size = tex.shader_node.image.size
sizes.add((size[0], size[1]))
return len(sizes) == 1
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