;;; guile-2d
;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
;;;
;;; Guile-2d is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-2d is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this program.  If not, see
;;; <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; Custom wrappers over low level OpenGL commands that aren't part of
;; FIGL.
;;
;;; Code:

(define-module (2d gl)
  #:use-module (figl runtime)
  #:use-module ((figl gl low-level) #:renamer (symbol-prefix-proc '%))
  #:export (pixel-format*))

;; Workaround broken figl pixel-fromat enumeration.
(define-enumeration
  pixel-format*
  (color-index 6400)
  (stencil-index 6401)
  (depth-component 6402)
  (red 6403)
  (green 6404)
  (blue 6405)
  (alpha 6406)
  (rgb 6407)
  (rgba 6408)
  (luminance 6409)
  (luminance-alpha 6410)
  (abgr-ext 32768)
  (cmyk-ext 32780)
  (cmyka-ext 32781)
  (ycrcb-422-sgix 33211)
  (ycrcb-444-sgix 33212))

;;;
;;; 3.8.1 Texture Image Specification
;;;

(re-export (%glTexImage3D . gl-texture-image-3d)
           (%glTexImage2D . gl-texture-image-2d)
           (%glTexImage1D . gl-texture-image-1d))

;;;
;;; 3.8.2 Alternate Texture Image Specification Commands
;;;

(re-export (%glCopyTexImage2D . gl-copy-texture-image-2d)
           (%glCopyTexImage1D . gl-copy-texture-image-1d)
           (%glCopyTexSubImage3D . gl-copy-texture-sub-image-3d)
           (%glCopyTexSubImage2D . gl-copy-texture-sub-image-2d)
           (%glCopyTexSubImage1D . gl-copy-texture-sub-image-1d)
           (%glTexSubImage3D . gl-texture-sub-image-3d)
           (%glTexSubImage2D . gl-texture-sub-image-2d)
           (%glTexSubImage1D . gl-texture-sub-image-1d))

;;;
;;; 3.8.3 Compressed Texture Images
;;;

(re-export (%glCompressedTexImage1D . gl-compressed-texture-image-1d)
           (%glCompressedTexImage2D . gl-compressed-texture-image-2d)
           (%glCompressedTexImage3D . gl-compressed-texture-image-3d)
           (%glCompressedTexSubImage1D . gl-compressed-texture-sub-image-1d)
           (%glCompressedTexSubImage2D . gl-compressed-texture-sub-image-2d)
           (%glCompressedTexSubImage3D . gl-compressed-texture-sub-image-3d))

;;;
;;; 3.8.4 Texture Parameters
;;;

(re-export  (%glTexParameteri . gl-texture-parameter))

;; emacs: (put 'with-gl-bind-texture 'scheme-indent-function 2)
(define-syntax-rule (with-gl-bind-texture target id body ...)
  (begin
    (%glBindTexture target id)
    body
    ...
    (%glBindTexture target 0)))

(export with-gl-bind-texture)