void opengl_viewport(int view_width, int view_height, int split, int benson_at_line, double fov, double benson_size);
void opengl_blit_image(uint8_t *rgb, int filter, int benson_at_line, int render_benson_only, double fov, double monitor_distance, double benson_size, int benson_case);
void opengl_blit_osd(int num, uint8_t *rgba, int filter, int benson_at_line, double fov, double monitor_distnace, double benson_size, double scale_x, double scale_y, double offset_x, double offset_y);
void opengl_render_color(double r, double g, double b, double a);
void opengl_viewport(int view_width, int view_height, int split, int benson_at_line, double fov, double benson_size);
void opengl_blit_image(uint8_t *rgb, int filter, int benson_at_line, int render_benson_only, double fov, double monitor_distance, double benson_size, int benson_case);
void opengl_blit_osd(int num, uint8_t *rgba, int filter, int benson_at_line, double fov, double monitor_distnace, double benson_size, double scale_x, double scale_y, double offset_x, double offset_y);
void opengl_render_color(double r, double g, double b, double a);