syndicate-lang
/
syndicate-2017
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Support texture clipping

This commit is contained in:
Tony Garnock-Jones 2016-09-25 15:06:07 -04:00
parent be7cf7417d
commit 4ea2586666
1 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
racket/syndicate-gl/2d.rkt
View File

@ -233,6 +233,9 @@
[`(texture ,i)
(define entry (image->texture-cache-entry i))
(values `(draw-gl-face ,(send entry get-texture)) '() (list entry) xform)]
[`(texture ,i ,l ,t ,w ,h) #:when (andmap number? (list l t w h))
(define entry (image->texture-cache-entry i))
(values `(draw-gl-face ,(send entry get-texture) ,l ,t ,w ,h) '() (list entry) xform)]
[`(touchable ,id ,predicate)
(values `(void) (list (touchable id xform predicate)) '() xform)]
[`(push-matrix ,instr ...)
@ -272,17 +275,19 @@
;; (define (lerp a b v) (+ (* v a) (* (- 1 v) b)))
(define (draw-gl-face texture)
(define (draw-gl-face texture [left 0] [top 0] [width 1] [height 1])
(define bot (+ top height))
(define right (+ left width))
(send texture bind-texture)
(glBegin GL_QUADS)
(glNormal3d 0 0 -1)
(glTexCoord2i 0 0)
(glTexCoord2d left top)
(glVertex3d 0 0 0)
(glTexCoord2i 1 0)
(glTexCoord2d right top)
(glVertex3d 1 0 0)
(glTexCoord2i 1 1)
(glTexCoord2d right bot)
(glVertex3d 1 1 0)
(glTexCoord2i 0 1)
(glTexCoord2d left bot)
(glVertex3d 0 1 0)
(glEnd))