diff --git a/StbiWrite.cs b/StbiWrite.cs
new file mode 100644
index 0000000..074d20b
--- /dev/null
+++ b/StbiWrite.cs
@@ -0,0 +1,50 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace ReFuel.Stb
+{
+    public unsafe delegate void StbiWriteProc(void* context, void* data, int size);
+
+    public unsafe partial class Stbi
+    {
+        private static readonly int* _tga_with_rle_ptr;
+        private static readonly int* _png_compression_level_ptr;
+        private static readonly int* _forced_png_filter_ptr;
+
+        public static int write_tga_with_rle
+        {
+            get => *_tga_with_rle_ptr;
+            set => *_tga_with_rle_ptr = value;
+        }
+
+        public static int write_png_compression_level
+        { 
+            get => *_png_compression_level_ptr;
+            set => *_png_compression_level_ptr = value;
+        }
+
+        public static int write_force_png_filter
+        {
+            get => *_forced_png_filter_ptr;
+            set => *_forced_png_filter_ptr = value;
+        }
+
+        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_png_to_func")]
+        public static extern int write_png_to_func(IntPtr func, void* context, int w, int h, int comp, void* data, int stride_in_bytes);
+
+        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_bmp_to_func")]
+        public static extern int write_bmp_to_func(IntPtr func, void* context, int w, int h, int comp, void* data);
+
+        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_tga_to_func")]
+        public static extern int write_tga_to_func(IntPtr func, void* context, int w, int h, int comp, void* data);
+
+        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_hdr_to_func")]
+        public static extern int write_hdr_to_func(IntPtr func, void* context, int w, int h, int comp, void* data);
+
+        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_jpg_to_func")]
+        public static extern int write_jpg_to_func(IntPtr func, void* context, int w, int h, int comp, void* data, int quality);
+
+        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_flip_vertically_on_write")]
+        public static extern int flip_vertically_on_write(int value);
+    }
+}