66 lines
2 KiB
GDScript3
66 lines
2 KiB
GDScript3
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@tool
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extends EditorResourcePreviewGenerator
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const HTerrainData = preload("../hterrain_data.gd")
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const HT_Errors = preload("../util/errors.gd")
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const HT_Logger = preload("../util/logger.gd")
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var _logger = HT_Logger.get_for(self)
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func _generate(res: Resource, size: Vector2i, metadata: Dictionary) -> Texture2D:
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if res == null or not (res is HTerrainData):
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return null
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var normalmap = res.get_image(HTerrainData.CHANNEL_NORMAL)
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if normalmap == null:
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return null
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return _generate_internal(normalmap, size)
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func _generate_from_path(path: String, size: Vector2i, metadata: Dictionary) -> Texture2D:
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if not path.ends_with("." + HTerrainData.META_EXTENSION):
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return null
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var data_dir := path.get_base_dir()
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var normals_fname := str(HTerrainData.get_channel_name(HTerrainData.CHANNEL_NORMAL), ".png")
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var normals_path := data_dir.path_join(normals_fname)
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var normals := Image.new()
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var err := normals.load(normals_path)
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if err != OK:
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_logger.error("Could not load '{0}', error {1}" \
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.format([normals_path, HT_Errors.get_message(err)]))
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return null
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return _generate_internal(normals, size)
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func _handles(type: String) -> bool:
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return type == "Resource"
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static func _generate_internal(normals: Image, size: Vector2) -> Texture2D:
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var im := Image.create(size.x, size.y, false, Image.FORMAT_RGB8)
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var light_dir := Vector3(-1, -0.5, -1).normalized()
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for y in im.get_height():
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for x in im.get_width():
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var fx := float(x) / float(im.get_width())
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var fy := float(im.get_height() - y - 1) / float(im.get_height())
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var mx := int(fx * normals.get_width())
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var my := int(fy * normals.get_height())
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var n := _decode_normal(normals.get_pixel(mx, my))
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var ndot := -n.dot(light_dir)
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var gs := clampf(0.5 * ndot + 0.5, 0.0, 1.0)
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var col := Color(gs, gs, gs, 1.0)
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im.set_pixel(x, y, col)
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var tex := ImageTexture.create_from_image(im)
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return tex
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static func _decode_normal(c: Color) -> Vector3:
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return Vector3(2.0 * c.r - 1.0, 2.0 * c.b - 1.0, 2.0 * c.g - 1.0)
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