from mcp.server.fastmcp import FastMCP, Context
from typing import Dict, Any
from unity_connection import get_unity_connection
import os
import base64
def register_manage_shader_tools(mcp: FastMCP):
"""Register all shader script management tools with the MCP server."""
@mcp.tool()
def manage_shader(
ctx: Context,
action: str,
name: str,
path: str,
contents: str,
) -> Dict[str, Any]:
"""Manages shader scripts in Unity (create, read, update, delete).
Args:
action: Operation ('create', 'read', 'update', 'delete').
name: Shader name (no .cs extension).
path: Asset path (default: "Assets/").
contents: Shader code for 'create'/'update'.
Returns:
Dictionary with results ('success', 'message', 'data').
"""
try:
# Prepare parameters for Unity
params = {
"action": action,
"name": name,
"path": path,
}
# Base64 encode the contents if they exist to avoid JSON escaping issues
if contents is not None:
if action in ['create', 'update']:
# Encode content for safer transmission
params["encodedContents"] = base64.b64encode(contents.encode('utf-8')).decode('utf-8')
params["contentsEncoded"] = True
else:
params["contents"] = contents
# Remove None values so they don't get sent as null
params = {k: v for k, v in params.items() if v is not None}
# Send command to Unity
response = get_unity_connection().send_command("manage_shader", params)
# Process response from Unity
if response.get("success"):
# If the response contains base64 encoded content, decode it
if response.get("data", {}).get("contentsEncoded"):
decoded_contents = base64.b64decode(response["data"]["encodedContents"]).decode('utf-8')
response["data"]["contents"] = decoded_contents
del response["data"]["encodedContents"]
del response["data"]["contentsEncoded"]
return {"success": True, "message": response.get("message", "Operation successful."), "data": response.get("data")}
else:
return {"success": False, "message": response.get("error", "An unknown error occurred.")}
except Exception as e:
# Handle Python-side errors (e.g., connection issues)
return {"success": False, "message": f"Python error managing shader: {str(e)}"}