some minor refresh

.vscode/launch.json

@@ -0,0 +1,7 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": []
+}

.vscode/settings.json

@@ -1,4 +1,22 @@
 {
     "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
-    "cmake.configureOnOpen": true
+    "cmake.configureOnOpen": true,
+    "files.associations": {
+        "array": "cpp",
+        "cwchar": "cpp",
+        "unordered_map": "cpp",
+        "vector": "cpp",
+        "exception": "cpp",
+        "functional": "cpp",
+        "initializer_list": "cpp",
+        "iosfwd": "cpp",
+        "istream": "cpp",
+        "new": "cpp",
+        "ostream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "type_traits": "cpp",
+        "tuple": "cpp"
+    },
+    "mesonbuild.configureOnOpen": false
 }

.vscode/tasks.json

@@ -0,0 +1,28 @@
+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++ build active file",
+            "command": "/usr/bin/g++",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}/${fileBasenameNoExtension}"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "Task generated by Debugger."
+        }
+    ],
+    "version": "2.0.0"
+}

CMakeLists.txt

@@ -7,9 +7,9 @@ cmake_minimum_required(VERSION 3.8)
 project(pixwerx)
 
 #
-# pixwerx ist C++17
+# pixwerx ist C++20
 #
-set (CMAKE_CXX_STANDARD 23)
+set (CMAKE_CXX_STANDARD 20)
 
 # internal cmake modules
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/etc/cmake ${CMAKE_MODULE_PATH})

src/deps/lua-5.4.2/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 3.20)
 
 project (lua)
 

src/visual/src/renderer.cpp

@@ -124,7 +124,7 @@ struct renderer::impl {
        this->_change_count = m.change_count();
 
 
-#if 0
+#if 1
         // get errors
         auto error = glGetError();
         if (error != GL_NO_ERROR) {

src/visual/src/shader.cpp

@@ -159,17 +159,17 @@ struct shader::impl
 
 	void bind(int location,const matrix3x3f& m)
     {
-		glUniformMatrix3fv(location,1,GL_FALSE,m.data);
+		glUniformMatrix3fv(location,1,GL_FALSE,m.ptr());
 	}
 
 	void bind(int location,const matrix4x4f& m)
 	{
-		glUniformMatrix4fv(location,1,GL_FALSE,m.data);
+		glUniformMatrix4fv(location,1,GL_FALSE,m.ptr());
 	}
 
 	void bind(int location,const vector4f& v)
 	{
-		glUniform4fv(location,1,v.data);
+		glUniform4fv(location,1,v.ptr());
 	}
 
 	void bind(int location,const float& v)