-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/simple/source/utils/texture.d

@@ -0,0 +1,49 @@
+module utils.texture;
+
+import ecs.std;
+
+import bindbc.sdl;
+import bindbc.sdl.image;
+
+import ecs_utils.math.vector;
+
+struct Texture
+{
+
+    void create()
+    {
+        data = Mallocator.make!Data;
+    }
+
+    bool load(SDL_Renderer* renderer, const char[] path)
+    {
+        char[] cpath = (cast(char*)alloca(path.length+1))[0..path.length+1];
+        //cpath[0..$-1] = path[0..$];
+        memcpy(cpath.ptr, path.ptr, path.length);
+        cpath[$-1] = 0;
+
+        SDL_Surface* surf = IMG_Load(cpath.ptr);
+        if(!surf)return false;
+
+        data.size = ivec2(surf.w,surf.h);
+
+        data.texture = SDL_CreateTextureFromSurface(renderer,surf);
+        SDL_FreeSurface(surf);
+
+        if(!data.texture)return false;
+
+        return true;
+    }
+
+    struct Data
+    {
+        ubyte[] data;
+
+        ivec2 size; 
+        uint bpp;
+
+        SDL_Texture* texture;
+    }
+
+    Data* data;
+}

demos/simple/source/utils/utils.d

@@ -0,0 +1,110 @@
+module utils.utils;
+
+extern(C) int printf(scope const char* format, ...) @nogc nothrow @system;
+
+version(WebAssembly)
+{
+
+    extern (C) alias em_callback_func = void function();
+    extern (C) alias em_arg_callback_func = void function(void*);
+    extern (C) void emscripten_set_main_loop(em_callback_func func, int fps, int simulate_infinite_loop);
+    extern (C) void emscripten_set_main_loop_arg(em_arg_callback_func func, void *arg, int fps, int simulate_infinite_loop);
+    extern (C) int emscripten_set_main_loop_timing(int mode, int value);
+    extern (C) void emscripten_cancel_main_loop();
+
+	alias int time_t;
+	alias int clockid_t;
+	enum CLOCK_REALTIME = 0;
+
+	struct timespec
+	{
+		time_t  tv_sec;
+		int     tv_nsec;
+	}
+
+	extern(C) int clock_gettime(clockid_t, timespec*) @nogc nothrow @system;
+
+	struct Time
+    {
+		
+
+        static long getUSecTime()
+        {
+			time_t time;
+			timespec spec;
+
+			clock_gettime(CLOCK_REALTIME, &spec);
+
+			//time = spec.tv_sec;
+			return spec.tv_sec * 1000_000 + spec.tv_nsec / 1000;//time / 1000_000;
+			
+			/*LARGE_INTEGER time, freq;
+            QueryPerformanceFrequency(&freq);
+			QueryPerformanceCounter(&time);
+            return time.QuadPart / (freq.QuadPart / 1000_000);*/
+        }
+    }
+}
+else version(Windows)
+{
+	import core.stdc.stdio : printf;
+	import core.sys.windows.windows;
+	struct Time
+    {
+        static long getUSecTime()
+        {
+            LARGE_INTEGER time, freq;
+            QueryPerformanceFrequency(&freq);
+			QueryPerformanceCounter(&time);
+            return time.QuadPart / (freq.QuadPart / 1000_000);
+        }
+    }
+}
+else version(Posix)
+{
+	import core.stdc.stdio : printf;
+	import core.sys.posix.time;
+	struct Time
+    {
+        static long getUSecTime()
+        {
+			time_t time;
+			timespec spec;
+
+			clock_gettime(CLOCK_REALTIME, &spec);
+
+			//time = spec.tv_sec;
+			return spec.tv_sec * 1000_000 + spec.tv_nsec / 1000;//time / 1000_000;
+			
+			/*LARGE_INTEGER time, freq;
+            QueryPerformanceFrequency(&freq);
+			QueryPerformanceCounter(&time);
+            return time.QuadPart / (freq.QuadPart / 1000_000);*/
+        }
+    }
+}
+
+import bindbc.sdl;
+import utils.texture;
+import ecs_utils.math.vector;
+
+ivec2 resolution = ivec2(600, 400);
+
+void draw(SDL_Renderer* renderer, Texture tex, vec2 pos, vec2 size, vec4 coords, float angle = 0)
+{
+	
+	SDL_Rect rect = SDL_Rect(cast(int)(coords.x*tex.data.size.x),cast(int)(coords.y*tex.data.size.y),cast(int)(coords.z*tex.data.size.x),cast(int)(coords.w*tex.data.size.y));
+	SDL_Rect rect2 = SDL_Rect(cast(int)((pos.x-size.x*0.5)),
+							cast(int)(resolution.y - pos.y - size.y*0.5),
+							cast(int)(size.x),
+							cast(int)(size.y));
+
+	SDL_RenderCopyEx(renderer,
+				tex.data.texture,
+				&rect,
+				&rect2,
+				angle*360,
+				null,
+				SDL_FLIP_NONE);
+	
+}