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\ opengl example
\ Copyright (C) 2014,2016,2017,2018 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation, either version 3
\ of the License, or (at your option) any later version.
\ This program 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 General Public License for more details.
\ You should have received a copy of the GNU General Public License
\ along with this program. If not, see http://www.gnu.org/licenses/.
require gl-helper.fs
also opengl
also [IFDEF] android android [THEN]
also [IFDEF] jni jni [THEN]
also [IFDEF] x11 x11 [THEN]
tex: ascii-tex
: load-textures ( -- )
ascii-tex s" ascii.png" load-texture 2drop ;
:noname defers reload-textures load-textures ; is reload-textures
\ triangle example
buffer-init
: set-triangle ( angle -- ) pi 1.5e f/ { f: angle f: 120deg } >v
angle fsincos angle 6 fm* fcos .1e f* -1e f+ >xyz v+
angle 120deg f- fsincos angle 6 fm* fcos .1e f* -1e f+ >xyz v+
angle 120deg f+ fsincos angle 6 fm* fcos .1e f* -1e f+ >xyz v+ o> ;
\ 0 set-triangle
: colors ( -- ) >v
red# i>c v+
green# i>c v+
blue# i>c v+ v> ;
: colors' ( -- ) >v
blue# i>c v+
red# i>c v+
green# i>c v+ v> ;
: texcoords >v
2e0 0e0 >st v+
1e0 2e0 >st v+
0e0 0e0 >st v+ o> ;
: normals >v
3 0 DO 0e 0e -1e n>xyz v+ LOOP o> ;
Variable new-config
FVariable touch -100e touch f!
FVariable motion 0.01e motion f!
: draw-tri-angle ( f -- )
0.01e 0.02e 0.15e 1.0e glClearColor
clear program init
Ambient 1 ambient% glUniform1fv
vi0 set-triangle
normals texcoords colors
none-tex
0 i, 1 i, 2 i,
GL_TRIANGLES draw-elements
v0 colors'
ascii-tex
GL_TRIANGLES draw-elements
sync ;
: draw-tri { f: angle -- angle' }
[IFDEF] ?config-changer ?config-changer [THEN]
angle draw-tri-angle
>looper default>ap
*input >r r@ IF
r@ action @ abs 1 u> IF
\ ." Touch at " r@ x0 ? r@ y0 ? cr
\ r@ x0 @ 20 < r@ y0 @ 20 < and IF -1 (bye) THEN
r@ x0 @ dpy-w @ 2/ - s>f dpy-h @ 2/ fm/
r@ y0 @ dpy-h @ 2/ - s>f dpy-h @ 2/ fm/
fover fover fnegate 1.5e lightpos glUniform3f
fatan2
touch f@ -100e f= IF
angle f- touch f!
ELSE
touch f@ f-
fdup angle f-
fdup pi f> IF pi f2* f- THEN
fdup pi fnegate f< IF pi f2* f+ THEN
fdup f0= IF fdrop ELSE
( .2e f* motion f@ .8e f* f+ ) motion f! THEN
to angle
THEN
ambient% sf@ 0.05e f- 0.0e fmax ambient% sf!
ELSE
ambient% sf@ 0.05e f+ 1.0e fmin ambient% sf!
angle motion f@ f+ to angle
motion f@ 0.01e f- 0.95e f* 0.01e f+ motion f!
-100e touch f!
THEN
\ ." Motion: " motion f@ f. cr 0 -1 at-deltaxy
THEN
rdrop angle ;
: tri-loop ( -- ) 1 level# +! 0e BEGIN draw-tri level# @ 0= UNTIL fdrop ;
: gl-sample ( -- )
[IFDEF] hidekb hidekb +config [THEN]
[IFDEF] map-win exposed @ 0= IF map-win THEN [THEN]
['] VertexShader ['] FragmentShader create-program to program
program init load-textures .info
tri-loop ;
previous previous previous previous
win 0= [IF] window-init [THEN]
gl-sample
script? [IF] bye [THEN]
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