add ui.json and del default values from SparkEmitter

config/spark_config.json

@@ -17,6 +17,6 @@
     "lifeTimeRange": [600.0, 1400.0],
     "texture": "./resources/spark.png",
     "shaderProgramName": "default",
-    "vertexShader": "./shaders/default.vertex",
-    "fragmentShader": "./shaders/default.fragment"
+    "vertexShader": "./shaders/spark.vertex",
+    "fragmentShader": "./shaders/spark.fragment"
 }

config/ui.json

@@ -0,0 +1,72 @@
+{
+  "root": {
+    "type": "FrameLayout",
+    "x": 0,
+    "y": 0,
+    "width": 1280,
+    "height": 720,
+    "children": [
+      {
+        "type": "FrameLayout",
+        "name": "leftPanel",
+        "x": 100,
+        "y": 100,
+        "width": 320,
+        "height": 400,
+        "children": [
+          {
+            "type": "LinearLayout",
+            "name": "mainButtons",
+            "orientation": "vertical",
+            "spacing": 10,
+            "x": 0,
+            "y": 0,
+            "width": 300,
+            "height": 300,
+            "children": [
+              {
+                "type": "Button",
+                "name": "playButton",
+                "x": 100,
+                "y": 100,
+                "width": 200,
+                "height": 50,
+                "textures": {
+                  "normal": "./resources/button.png",
+                  "hover": "./resources/rock.png",
+                  "pressed": "./resources/sand.png"
+                }
+              },
+              {
+                "type": "Button",
+                "name": "settingsButton",
+                "x": 100,
+                "y": 200,
+                "width": 200,
+                "height": 50,
+                "textures": {
+                  "normal": "./resources/button.png",
+                  "hover": "./resources/rock.png",
+                  "pressed": "./resources/sand.png"
+                }
+              },
+              {
+                "type": "Button",
+                "name": "exitButton",
+                "x": 150,
+                "y": 300,
+                "width": 200,
+                "height": 50,
+                "textures": {
+                  "normal": "./resources/button.png",
+                  "hover": "./resources/rock.png",
+                  "pressed": "./resources/sand.png"
+                }
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+}