public void AddText(ImFontPtr font, float font_size, Vector2 pos, uint col, string text_begin)
{
ImFont *native_font = font.NativePtr;
int text_begin_byteCount = Encoding.UTF8.GetByteCount(text_begin);
byte * native_text_begin = stackalloc byte[text_begin_byteCount + 1];
fixed(char *text_begin_ptr = text_begin)
{
int native_text_begin_offset = Encoding.UTF8.GetBytes(text_begin_ptr, text_begin.Length, native_text_begin, text_begin_byteCount);
native_text_begin[native_text_begin_offset] = 0;
}
byte * native_text_end = null;
float wrap_width = 0.0f;
Vector4 *cpu_fine_clip_rect = null;
ImGuiNative.ImDrawList_AddTextFontPtr(NativePtr, native_font, font_size, pos, col, native_text_begin, native_text_end, wrap_width, cpu_fine_clip_rect);
}