proc clear(self: Framebuffer; color = vec4(0, 0, 0, 0); clear_color = true;
           clear_depth = true; layer = -1) {.inline, ...raises: [Exception],
    tags: [RootEffect].}

proc destroy(self: Framebuffer; remove_from_context: bool = true) {.
    ...raises: [Exception], tags: [RootEffect].}

proc disable(self: Framebuffer) {....raises: [Exception], tags: [RootEffect].}

proc draw(dest: Framebuffer; shader_mat: Material; inputs: seq[Texture];
          rect = none((int32, int32, int32, int32)); layer = -1;
          mipmap_level = 0) {....raises: [Exception, ValueError],
                              tags: [RootEffect].}

proc enable(self: Framebuffer; rect = none((int32, int32, int32, int32));
            layer = -1; mipmap_level = 0; mark_textures = true): Framebuffer {.
    discardable, ...raises: [Exception], tags: [RootEffect].}

proc generate_mipmap(self: Framebuffer; custom_shader: Material = nil) {.
    ...raises: [Exception, ValueError], tags: [RootEffect].}

proc get_framebuffer_status_string(self: Framebuffer): string {.
    ...raises: [Exception, ValueError], tags: [RootEffect].}

proc newFramebuffer(engine: MyouEngine; width, height: int;
                    format: TextureFormat;
                    depth_type: FramebufferDepthType = DepthNone;
                    depth_format = Depth_u16; depth_only = false;
                    filter: TextureFilter = Linear;
                    tex_type: TextureType = Tex2D;
                    depth_filter: TextureFilter = Linear;
                    depth_tex_type: TextureType = Tex2D; layer_count = 1;
                    texture: Texture = nil): Framebuffer {.
    ...raises: [ValueError, Exception], tags: [RootEffect].}

proc newMainFramebuffer(engine: MyouEngine): Framebuffer {....raises: [], tags: [].}