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authorDavid Thompson <dthompson2@worcester.edu>2013-06-12 22:24:25 -0400
committerDavid Thompson <dthompson2@worcester.edu>2013-06-12 22:24:25 -0400
commite615aa91ca0522117265ac43145c0a016ecb1f4b (patch)
tree7595f06244df0dbb6aaa8eebbfea5543bf6f137a
parent99dc94fbc3a08ecf207dbe4171ea88d8df6c67cb (diff)
Add texture module.
-rw-r--r--2d/texture.scm87
1 files changed, 87 insertions, 0 deletions
diff --git a/2d/texture.scm b/2d/texture.scm
new file mode 100644
index 0000000..3473e6d
--- /dev/null
+++ b/2d/texture.scm
@@ -0,0 +1,87 @@
+;;; 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:
+;;
+;; OpenGL texture wrapper.
+;;
+;;; Code:
+
+(define-module (2d texture)
+ #:use-module (srfi srfi-9)
+ #:use-module ((sdl sdl) #:prefix SDL:)
+ #:use-module (figl gl)
+ #:export (make-texture
+ texture?
+ texture-id
+ texture-width
+ texture-height
+ surface->texture
+ load-texture
+ texture-quad))
+
+;; The <texture> object is a simple wrapper around an OpenGL texture
+;; id.
+(define-record-type <texture>
+ (make-texture id width height)
+ texture?
+ (id texture-id)
+ (width texture-width)
+ (height texture-height))
+
+(define (surface->texture surface)
+ "Translates an SDL surface into an OpenGL texture.
+Currently only works with RGBA format surfaces."
+ (let* ((texture-id (gl-generate-texture)))
+ (with-gl-bind-texture (texture-target texture-2d) texture-id
+ (gl-tex-parameter (texture-target texture-2d)
+ (texture-parameter-name texture-min-filter)
+ (texture-min-filter linear))
+ (gl-tex-parameter (texture-target texture-2d)
+ (texture-parameter-name texture-mag-filter)
+ (texture-mag-filter linear))
+ (gl-tex-image-2d (texture-target texture-2d)
+ 0
+ (pixel-format rgba)
+ (SDL:surface:w surface)
+ (SDL:surface:h surface)
+ 0
+ (pixel-format rgba)
+ (color-pointer-type unsigned-byte)
+ (SDL:surface-pixels surface)))
+ (make-texture texture-id
+ (SDL:surface:w surface)
+ (SDL:surface:h surface))))
+
+(define (load-texture filename)
+ "Loads a texture from a file."
+ (surface->texture (SDL:load-image filename)))
+
+(define* (texture-quad texture x y w h)
+ "Renders a textured quad."
+ (let ((x2 (+ x w))
+ (y2 (+ y h)))
+ (with-gl-bind-texture (texture-target texture-2d) (texture-id texture)
+ (gl-begin (begin-mode quads)
+ (gl-texture-coordinates 0 0)
+ (gl-vertex x y)
+ (gl-texture-coordinates 1 0)
+ (gl-vertex x2 y)
+ (gl-texture-coordinates 1 1)
+ (gl-vertex x2 y2)
+ (gl-texture-coordinates 0 1)
+ (gl-vertex x y2)))))