-improved WASM compilation scripts

-added external bindbc.sdl import for WASM
-working on demos (WIP, working simple demo with ECS and SDL2)
-small change in ecs.std

demos/utils/dub.json

@@ -0,0 +1,50 @@
+{
+	"name": "ecs_utils",
+	"authors": [
+		"Michał Masiukiewicz", "Dawid Masiukiewicz"
+	],
+	"description": "Dynamic Entity Component System examples utils",
+	"copyright": "Copyright © 2018-2019, Michał Masiukiewicz, Dawid Masiukiewicz",
+	"license": "BSD",
+	"sourcePaths" : [
+		"source\/"
+	],
+	"importPaths": [
+		"source"
+	],
+	"dflags-posix-ldc": [
+		"-defaultlib=phobos2-ldc,druntime-ldc"
+	],
+	"dflagss": [
+		"-betterC"
+	],
+	"dependencies": {
+		"bindbc-sdl":"0.10.1"
+	},
+	"versions": [
+		"BindSDL_Image",
+		"SDL_2010"
+	],
+	
+	"configurations" : [
+		{
+			"name" : "default",
+			"targetType" : "library",
+			"subConfigurations": 
+			{
+				"bindbc-sdl": "static"	
+			}
+		},
+		{
+			"name" : "betterC",
+			"targetType" : "library",
+			"dflags": [
+				"-betterC"
+			],
+			"subConfigurations": 
+			{
+				"bindbc-sdl": "staticBC"	
+			}
+		}
+	]
+}

demos/utils/source/ecs_utils/math/matrix.d

@@ -0,0 +1,6 @@
+module ecs_utils.math.matrix;
+
+struct mat3
+{
+    float[9] data;
+}

demos/utils/source/ecs_utils/math/vector.d

@@ -0,0 +1,100 @@
+module ecs_utils.math.vector;
+
+struct vec2
+{
+    union
+    {
+        struct
+        {
+            float x;
+            float y;
+        }
+        float[2] data;
+    }
+
+    vec2 opBinary(string op)(vec2 v)
+    {
+        static if (op == "+") return vec2(x + v.x, y + v.y);
+        else static if (op == "-") return vec2(x - v.x, y - v.y);
+        else static if (op == "*") return vec2(x * v.x, y * v.y);
+        else static if (op == "/") return vec2(x / v.x, y / v.y);
+        else static assert(0, "Operator "~op~" not implemented");
+    }
+
+    vec2 opBinary(string op)(float v)
+    {
+        static if (op == "+") return vec2(x + v, y + v);
+        else static if (op == "-") return vec2(x - v, y - v);
+        else static if (op == "*") return vec2(x * v, y * v);
+        else static if (op == "/") return vec2(x / v, y / v);
+        else static assert(0, "Operator "~op~" not implemented");
+    }
+
+    void opOpAssign(string op)(vec2 v)
+    {
+        static if (op == "+")
+        {
+            x += v.x;
+            y += v.y;
+        }
+        else static if (op == "-")
+        {
+            x -= v.x;
+            y -= v.y;
+        }
+        else static if (op == "*")
+        {
+            x *= v.x;
+            y *= v.y;
+        }
+        else static if (op == "/")
+        {
+            x /= v.x;
+            y /= v.y;
+        }
+        else static assert(0, "Operator "~op~" not implemented");
+    }
+}
+
+struct vec4
+{
+    union
+    {
+        struct
+        {
+            float x;
+            float y;
+            float z;
+            float w;
+        }
+        float[4] data;
+    }
+}
+
+struct ivec2
+{
+    union
+    {
+        struct
+        {
+            int x;
+            int y;
+        }
+        int[2] data;
+    }
+}
+
+struct ivec4
+{
+    union
+    {
+        struct
+        {
+            int x;
+            int y;
+            int z;
+            int w;
+        }
+        int[4] data;
+    }
+}