From 2ac43ba7df3b2c3dc40c6b87c2bc57c4b02ffa42 Mon Sep 17 00:00:00 2001
From: hop311 <hop3114@gmail.com>
Date: Sun, 5 May 2024 18:36:21 +0100
Subject: Add GDScript XAC and XSM loaders

---
 game/src/Game/Model/FileAccessUtils.gd | 88 ++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 game/src/Game/Model/FileAccessUtils.gd

(limited to 'game/src/Game/Model/FileAccessUtils.gd')

diff --git a/game/src/Game/Model/FileAccessUtils.gd b/game/src/Game/Model/FileAccessUtils.gd
new file mode 100644
index 0000000..f5e02e1
--- /dev/null
+++ b/game/src/Game/Model/FileAccessUtils.gd
@@ -0,0 +1,88 @@
+class_name FileAccessUtils
+
+static func read_vec2(file : FileAccess) -> Vector2:
+	return Vector2(file.get_float(), file.get_float())
+
+static func read_vec3(file : FileAccess) -> Vector3:
+	return Vector3(file.get_float(), file.get_float(), file.get_float())
+
+static func read_pos(file : FileAccess) -> Vector3:
+	var pos : Vector3 = read_vec3(file)
+	pos.x = -pos.x
+	return pos
+
+static func read_vec4(file : FileAccess) -> Vector4:
+	return Vector4(file.get_float(), file.get_float(), file.get_float(), file.get_float())
+
+# Because paradox may or may not be consistent with the xsm spec depending on if its Tuesday or not
+static func read_quat(file : FileAccess, int16 : bool = false) -> Quaternion:
+	if int16:
+		return Quaternion(read_f16(file), -read_f16(file), -read_f16(file), read_f16(file))
+	else:
+		return Quaternion(file.get_float(), -file.get_float(), -file.get_float(), file.get_float())
+
+static func read_f16(file : FileAccess) -> float:
+	# 32767 or 0x7FFF is the max magnitude of a signed int16
+	return float(read_int16(file)) / 32767.0
+
+static func replace_chars(string : String) -> String:
+	return string.replace(":", "_").replace("\\", "_").replace("/", "_")
+
+static func read_xac_str(file : FileAccess) -> String:
+	var length : int = file.get_32()
+	var buffer : PackedByteArray = file.get_buffer(length)
+	return buffer.get_string_from_ascii()
+
+static func read_int32(file : FileAccess) -> int:
+	var bytes : int = file.get_32()
+	var negative : bool = bytes >> 31
+	var val : int = bytes & 0x7FFFFFFF
+	if negative:
+		val = -((val ^ 0x7FFFFFFF) + 1)
+	return val
+
+static func read_int16(file : FileAccess) -> int:
+	var bytes : int = file.get_16()
+	var negative : bool = bytes >> 15
+	var val : int = bytes & 0x7FFF
+	if negative:
+		val = -((val ^ 0x7FFF) + 1)
+	return val
+
+static func read_Color32(file : FileAccess) -> Color:
+	return Color8(file.get_8(), file.get_8(), file.get_8(), file.get_8())
+
+static func read_Color128(file : FileAccess) -> Color:
+	return Color(
+		file.get_32() / 0xFFFFFFFF,
+		file.get_32() / 0xFFFFFFFF,
+		file.get_32() / 0xFFFFFFFF,
+		file.get_32() / 0xFFFFFFFF
+	)
+
+static func read_mat4x4(file : FileAccess) -> xac_mat4x4:
+	return xac_mat4x4.new(read_vec4(file), read_vec4(file), read_vec4(file), read_vec4(file))
+
+# This datatype is only ever used to hold a transform for nodes (bones)
+class xac_mat4x4:
+	var col1 : Vector4
+	var col2 : Vector4
+	var col3 : Vector4
+	var col4 : Vector4
+
+	func _init(col1 : Vector4, col2 : Vector4, col3 : Vector4, col4 : Vector4) -> void:
+		self.col1 = col1
+		self.col2 = col2
+		self.col3 = col3
+		self.col4 = col4
+
+	func debugPrint() -> void:
+		print("\t\tMat4x4 col1:", col1, " col2:", col2, " col3:", col3, " col4:", col4)
+
+	func getAsTransform() -> Transform3D: # godot wants 3x4 matrix
+		return Transform3D(
+			Vector3(col1.x, col1.y, col1.z),
+			Vector3(col2.x, col2.y, col2.z),
+			Vector3(col3.x, col3.y, col3.z),
+			Vector3(col4.x, col4.y, col4.z)
+		)
-- 
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