converts a region in the room to a gpu scissor region

room_region_to_scissor_region.gml

/**
 * converts a room region to a gpu scissor region
 * @param {real} x the x position of the region origin
 * @param {real} y the y position of the region origin
 * @param {real} width the width of the region
 * @param {real} height the height of the region
 * @return {struct}
 */
function room_region_to_scissor_region(x, y, width, height) {
    
    static scissor_struct = { x: infinity, y: infinity, w: infinity, h: infinity };
    
    var current_view = camera_get_active();
    
    var view_width = camera_get_view_width(current_view);
    var view_height = camera_get_view_height(current_view);
    
    var view_x = camera_get_view_x(view_camera[current_view]);
    var view_y = camera_get_view_y(view_camera[current_view]);
    
    var render_width = surface_get_width(application_surface);
    var render_height = surface_get_height(application_surface);

    var scale_x = render_width / view_width;
    var scale_y = render_height / view_height;
    
    scissor_struct.x = (x - view_x) * scale_x;
    scissor_struct.y = (y - view_y) * scale_y;
    
    scissor_struct.w = width * scale_x;
    scissor_struct.h = height * scale_y;
    
    return scissor_struct;
    
}