;; Copyright 2010-2011 Christoph Senjak

(in-package :uxul-world)

(defun load-bmp-blob-into-texture (blob)
  (let*
      ((id (car (gl:gen-textures 1)))
       (pix (bmp-pixel-data blob))
       (w (bmp-width blob))
       (h (bmp-height blob)))
    (gl:bind-texture :texture-2d id)
    (gl:tex-image-2d :texture-2d 0 :rgba8 w h 0 :bgra :unsigned-byte pix)
    (gl:tex-parameter :texture-2d :texture-min-filter :linear)
    (gl:tex-parameter :texture-2d :texture-mag-filter :linear)
    (gl:flush)
    id))

(defun load-spritesheet ()
  (let*
      ((id (car (gl:gen-textures 1)))
       (wh (cadr *spritesheet*))
       (pix (car *spritesheet*)))
    (gl:bind-texture :texture-2d id)
    (gl:tex-image-2d :texture-2d 0 :rgba8 wh wh 0 :bgra :unsigned-byte pix)
    (gl:tex-parameter :texture-2d :texture-min-filter :linear)
    (gl:tex-parameter :texture-2d :texture-mag-filter :linear)
    (gl:flush)
    id))

(defun make-quad (imgs x y w h)
  (destructuring-bind (x1 y1 x2 y2) imgs
    (setf x (- x +screen-width+))
    (setf y (- y +screen-height+))
    (gl:bind-texture :texture-2d *spritesheet-id*)
    (gl:with-primitive :quads
      (gl:tex-coord x1 y1) (gl:vertex x (+ y h))
      (gl:tex-coord x2 y1) (gl:vertex  (+ x w) (+ y h))
      (gl:tex-coord x2 y2) (gl:vertex (+ x w) y)
      (gl:tex-coord x1 y2) (gl:vertex x y))))