-Demos:

*added ImGUI styles
 *added new assets (fonts, shaders)
 *added cimgui.dll
 *added imports for bindbc-sdl (for WASM)
 *added simple demo
 *added demo launcher
 *added snake demo
 *impoved demo utils
 *added cimgui.bc library for WASM
-improved wasm build script
-small change in vector

demos/utils/source/ecs_utils/gfx/buffer.d

@@ -0,0 +1,134 @@
+module ecs_utils.gfx.buffer;
+
+import ecs.std;
+
+import glad.gl.gl;
+import glad.gl.gles2;
+
+extern(C):
+
+struct Buffer
+{
+
+    void create() nothrow
+    {
+        data = Mallocator.make!Data;
+        data.gl_handle = 0;
+        glGenBuffers(1,&data.gl_handle);
+        data.elem_size = 0;
+    }
+
+    //---------------------------------------------------------------------------------------------------------------------------------------------------
+
+    void destroy() nothrow
+    {
+        if(data.gl_handle)glDeleteBuffers(1,&data.gl_handle);
+    }
+
+    //---------------------------------------------------------------------------------------------------------------------------------------------------
+
+    void bind(BindTarget target) nothrow
+    {
+        //if(vbo != this)glBindBuffer(GL_ARRAY_BUFFER,data.gl_handle);
+        //vbo = this;
+        glBindBuffer(target,data.gl_handle);
+    }
+
+    void bindRange(BindTarget target, uint index, uint offset, uint size) nothrow
+    {
+        glBindBufferRange(target, index, data.gl_handle, offset, size);
+    }
+
+    //---------------------------------------------------------------------------------------------------------------------------------------------------
+
+    void bufferData(BindTarget target, uint size, uint count, uint usage, void* data) nothrow
+    {
+        bind(target);
+        this.data.elem_size = size;
+        glBufferData(target,size*count,data,usage);
+    }
+
+    /*void bufferStorage(uint size, uint count, void* data, uint flags = StorageFlagBits.write)
+    {
+        bind(BindTarget.array);
+        this.data.elem_size = size;
+        glBufferStorage(GL_ARRAY_BUFFER,size*count,data, flags);
+    }*/
+
+    void bufferSubData(uint size, uint offset, void* data) nothrow
+    {
+        bind(BindTarget.array);
+        glBufferSubData(GL_ARRAY_BUFFER,offset,size,data);
+    }
+    
+    void map(BindTarget target) nothrow
+    {
+        bind(target);
+        data.map_ptr = glMapBuffer(target,GL_WRITE_ONLY);
+    }
+
+    void map(uint offset, uint size, BindTarget target, uint flags = MapFlagBits.write | MapFlagBits.flush_explict | MapFlagBits.invalidate_buffer) nothrow
+    {
+        bind(target);
+        data.map_ptr = glMapBufferRange(target,offset,size,flags);
+    }
+
+    void flush(uint offset, uint size, BindTarget target) nothrow
+    {
+        glFlushMappedBufferRange(target, offset, size);
+    }
+
+    void unmap(BindTarget target) nothrow
+    {
+        bind(target);
+        glUnmapBuffer(target);
+        data.map_ptr = null;
+    }
+
+    void* mappedPointer() nothrow
+    {
+        return data.map_ptr;
+    }
+
+    //---------------------------------------------------------------------------------------------------------------------------------------------------
+
+    static void unbind(BindTarget target) nothrow
+    {
+        //vbo = 0;
+        glBindBuffer(target,0);
+    }
+
+    enum BindTarget
+    {
+        array = GL_ARRAY_BUFFER,
+        element_array = GL_ELEMENT_ARRAY_BUFFER,
+        uniform = GL_UNIFORM_BUFFER,
+        //shader_storage = GL_SHADER_STORAGE_BUFFER,
+        //indirect = GL_DRAW_INDIRECT_BUFFER
+    }
+
+    enum MapFlagBits
+    {
+        write = GL_MAP_WRITE_BIT,
+        invalidate_buffer = GL_MAP_INVALIDATE_BUFFER_BIT,
+        flush_explict = GL_MAP_FLUSH_EXPLICIT_BIT,
+        //coherent = GL_MAP_COHERENT_BIT,
+        //persistent = GL_MAP_PERSISTENT_BIT
+    }
+
+    enum StorageFlagBits
+    {
+        write = GL_MAP_WRITE_BIT,
+        //coherent = GL_MAP_COHERENT_BIT,
+        //persistent = GL_MAP_PERSISTENT_BIT
+    }
+
+    struct Data
+    {
+        uint elem_size;
+        uint gl_handle;
+        void* map_ptr;
+    }
+
+    Data* data;
+}