feat: Implement material export

Signed-off-by: Lucas Schwiderski <lucas@lschwiderski.de>

addon/bitsquid/__init__.py

@@ -28,8 +28,11 @@ bl_info = {
 # Reload sub modules if they are already loaded
 if "bpy" in locals():
     import importlib
-    importlib.reload(unit_export)
-    importlib.reload(unit)
+    if "unit_export" in locals():
+        importlib.reload(unit_export)
+    if "material_export" in locals():
+        importlib.reload(material_export)
+
 
 import bpy
 from bpy.types import (
@@ -38,17 +41,19 @@ from bpy.types import (
     PropertyGroup,
 )
 from bpy.props import (
-    StringProperty,
     EnumProperty,
+    BoolProperty,
+    StringProperty,
     PointerProperty,
 )
 from bpy_extras.io_utils import (
     ExportHelper,
+    axis_conversion,
     orientation_helper,
     path_reference_mode,
-    axis_conversion,
 )
 from bitsquid.unit import export as unit_export
+from bitsquid.material import export as material_export
 
 
 class BitsquidSettings(PropertyGroup):
@@ -65,7 +70,6 @@ class SCENE_PT_bitsquid(Panel):
     bl_space_type = "PROPERTIES"
     bl_region_type = "WINDOW"
     bl_context = "scene"
-    # bl_options = {'DEFAULT_CLOSED'}
 
     def draw(self, context):
         layout = self.layout
@@ -84,6 +88,12 @@ class BitsquidObjectSettings(PropertyGroup):
         subtype='DIR_PATH',
     )
 
+    export_materials: BoolProperty(
+        name="Export materials",
+        description="Automatically export all referenced materials",
+        default=True,
+    )
+
 
 class OBJECT_OT_bitsquid_export(Operator):
     """Export this object into a Bitsquid Unit file"""
@@ -91,15 +101,18 @@ class OBJECT_OT_bitsquid_export(Operator):
     bl_label = "Export .unit"
     bl_options = {'REGISTER'}
 
-    filepath: StringProperty(subtype='DIR_PATH')
-
     @classmethod
     def poll(cls, context):
-        return bpy.data.is_saved and context.active_object is not None
+        object = context.active_object
+        return bpy.data.is_saved and object is not None and object.type == 'MESH'
 
     def execute(self, context):
-        print("Export .unit")
-        return unit_export.save(self, context, context.object.bitsquid.unit_filepath)
+        object = context.active_object
+        if object.bitsquid.export_materials:
+            for material_slot in object.material_slots.values():
+                material_export.save(self, context, material_slot.material)
+
+        return unit_export.save(self, context, object)
 
 
 class OBJECT_PT_bitsquid(Panel):
@@ -107,16 +120,67 @@ class OBJECT_PT_bitsquid(Panel):
     bl_space_type = "PROPERTIES"
     bl_region_type = "WINDOW"
     bl_context = "object"
-    # bl_options = {'DEFAULT_CLOSED'}
+
+    def draw(self, context):
+        object = context.object
+        layout = self.layout
+
+        if object.type != 'MESH':
+            layout.label(text="Only objects of type 'MESH' are supported.")
+            return
+
+        layout.use_property_split = False
+        layout.use_property_decorate = False
+
+        bitsquid = object.bitsquid
+        layout.prop(bitsquid, "unit_filepath", text="Unit File Path")
+        layout.prop(bitsquid, "export_materials", text="Export materials")
+        layout.operator("object.bitsquid_export_unit", text="Export .unit")
+
+
+class BitsquidMaterialSettings(PropertyGroup):
+    material_filepath: StringProperty(
+        name="Material File Path",
+        description="The directory to store the .material file in. Needs to be within the project root.",
+        default="//",
+        subtype='DIR_PATH',
+    )
+
+
+class MATERIAL_OT_bitsquid_export(Operator):
+    """Export this material into a Bitsquid Material file"""
+    bl_idname = "object.bitsquid_export_material"
+    bl_label = "Export .material"
+    bl_options = {'REGISTER'}
+
+    @classmethod
+    def poll(cls, context):
+        return bpy.data.is_saved and context.active_object is not None
+
+    def execute(self, context):
+        material = context.active_material
+        return unit_export.save(self, context, material)
+
+
+class MATERIAL_PT_bitsquid(Panel):
+    bl_label = "Bitsquid"
+    bl_space_type = "PROPERTIES"
+    bl_region_type = "WINDOW"
+    bl_context = "material"
+
+    @classmethod
+    def poll(cls, context):
+        object = context.active_object
+        return len(object.material_slots) > 0
 
     def draw(self, context):
         layout = self.layout
         layout.use_property_split = False
         layout.use_property_decorate = False
 
-        bitsquid = context.object.bitsquid
-        layout.prop(bitsquid, "unit_filepath", text="Unit File Path")
-        layout.operator("object.bitsquid_export_unit", text="Export .unit")
+        bitsquid = context.material.bitsquid
+        layout.prop(bitsquid, "material_filepath", text="Material File Path")
+        layout.operator("object.bitsquid_export_material", text="Export .material")
 
 
 # Register
@@ -126,6 +190,9 @@ classes = [
     BitsquidObjectSettings,
     OBJECT_PT_bitsquid,
     OBJECT_OT_bitsquid_export,
+    BitsquidMaterialSettings,
+    MATERIAL_PT_bitsquid,
+    MATERIAL_OT_bitsquid_export,
 ]
 
 
@@ -136,6 +203,7 @@ def register():
 
     bpy.types.Scene.bitsquid = PointerProperty(type=BitsquidSettings)
     bpy.types.Object.bitsquid = PointerProperty(type=BitsquidObjectSettings)
+    bpy.types.Material.bitsquid = PointerProperty(type=BitsquidMaterialSettings)
 
 
 def unregister():

addon/bitsquid/material/export.py

@@ -0,0 +1,101 @@
+#    Bitsquid Blender Tools
+#    Copyright (C) 2021  Lucas Schwiderski
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import os
+import bpy
+from bitsquid import step
+
+
+template = """
+parent_material = "core/stingray_renderer/shader_import/standard"
+
+textures = {}
+
+variables = {
+    base_color = {
+        type = "vector3"
+        value = [
+            1
+            0.333333333333333
+            0
+        ]
+    }
+    emissive = {
+        type = "vector3"
+        value = [
+            0
+            0
+            0
+        ]
+    }
+    emissive_intensity = {
+        type = "scalar"
+        value = 1
+    }
+    metallic = {
+        type = "scalar"
+        value = 0
+    }
+    roughness = {
+        type = "scalar"
+        value = 0.91
+    }
+    use_ao_map = {
+        type = "scalar"
+        value = 0
+    }
+    use_color_map = {
+        type = "scalar"
+        value = 0
+    }
+    use_emissive_map = {
+        type = "scalar"
+        value = 0
+    }
+    use_metallic_map = {
+        type = "scalar"
+        value = 0
+    }
+    use_normal_map = {
+        type = "scalar"
+        value = 0
+    }
+    use_roughness_map = {
+        type = "scalar"
+        value = 0
+    }
+}
+
+"""
+
+
+def build_filepath(material):
+    dir = bpy.path.abspath(material.bitsquid.material_filepath)
+    return os.path.join(dir, "{}.material".format(material.name))
+
+
+def save(self, context, material):
+    filepath = build_filepath(material)
+    self.report({'INFO'}, "Saving material to " + filepath)
+
+    namespace = {
+        'material': material,
+    }
+    content = step.Template(template).expand(namespace)
+
+    self.report({'INFO'}, content)
+
+    return {'FINISHED'}

addon/bitsquid/unit/export.py

@@ -14,11 +14,57 @@
 #    You should have received a copy of the GNU General Public License
 #    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+import os
 import bpy
+from bpy_extras import io_utils
+from bitsquid import step
+from bitsquid.material import export as material_export
+
+template = """
+%if len(materials) > 0:
+materials = {
+    %for item in materials:
+        {{ item['name'] }} = "{{ item['path'] }}"
+    %endfor
+}
+%endif
+
+renderables = {
+    {{ object.name }} = {
+        always_keep = false
+        culling = "bounding_volume"
+        generate_uv_unwrap = false
+        occluder = false
+        shadow_caster = true
+        surface_queries = false
+        viewport_visible = true
+    }
+}
+"""
 
 
-def save(self, context, unit_filepath):
-    filepath = bpy.path.abspath(unit_filepath)
+def build_filepath(object):
+    dir = bpy.path.abspath(object.bitsquid.unit_filepath)
+    return os.path.join(dir, "{}.unit".format(object.name))
+
+
+def save(self, context, object):
+    filepath = build_filepath(object)
     self.report({'INFO'}, "Saving unit to " + filepath)
 
+    materials = []
+    for material_slot in object.material_slots.values():
+        materials.append({
+            'name': material_slot.name,
+            'path': material_export.build_filepath(material_slot.material),
+        })
+
+    namespace = {
+        'object': object,
+        'materials': materials,
+    }
+    content = step.Template(template).expand(namespace)
+
+    self.report({'INFO'}, content)
+
     return {'FINISHED'}