[PD] GEM: multitexturing in GEM

[Cypod]

I use a [pix_image] and a [pix_texture]

In the glsl examples that we got earlier, this branch came after the
[glsl_propgram]

This patch lets you create a gem window and  load an image onto a square:


#N canvas 594 525 584 536 10;
#N canvas 811 737 462 312 gemwin 0;
#X obj 117 128 gemwin;
#X obj 215 76 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1
;
#X msg 140 52 create;
#X msg 133 23 ambient 0.2 0.2 0.9;
#X msg 125 -2 lighting \$1;
#X obj 125 -24 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X msg 148 79 destroy;
#X msg 21 69 fullscreen \$1;
#X obj 33 40 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1
;
#X obj 286 26 select 1;
#X obj 286 2 inlet;
#X obj 125 -45 inlet;
#X obj 137 206 pix_write;
#X msg 183 131 file /Users/beau/test.tif;
#X msg 42 129 bang;
#X obj 123 163 gemhead 21;
#X connect 1 0 0 0;
#X connect 2 0 0 0;
#X connect 3 0 0 0;
#X connect 4 0 0 0;
#X connect 5 0 4 0;
#X connect 6 0 0 0;
#X connect 7 0 0 0;
#X connect 8 0 7 0;
#X connect 9 0 2 0;
#X connect 9 0 1 0;
#X connect 9 1 1 0;
#X connect 9 1 6 0;
#X connect 10 0 9 0;
#X connect 11 0 5 0;
#X connect 13 0 12 0;
#X connect 14 0 12 0;
#X connect 15 0 12 0;
#X restore 59 -38 pd gemwin;
#X obj 59 -63 tgl 15 0 empty empty lighting 0 -6 0 8 -262144 -1 -1
0 1;
#X obj 117 -64 tgl 15 0 empty empty Render 0 -6 0 8 -262144 -1 -1 0
1;
#X obj 190 -61 gemhead 10;
#X obj 275 207 translateXYZ;
#X obj 323 299 scaleXYZ;
#X obj 326 327 square;
#X obj 258 100 pix_texture;
#X obj 232 55 pix_image;
#X floatatom 298 125 5 0 0 0 - - -;
#X obj 292 160 * 0.1;
#X floatatom 350 123 5 0 0 0 - - -;
#X obj 345 158 * 0.1;
#X floatatom 398 135 5 0 0 0 - - -;
#X obj 397 158 * 0.1;
#X obj 320 230 nbx 5 14 -1e+37 1e+37 0 0 empty empty empty 0 -6 0 10
-262144 -1 -1 0 256;
#X obj 386 230 nbx 5 14 -1e+37 1e+37 0 0 empty empty empty 0 -6 0 10
-262144 -1 -1 0 256;
#X obj 319 251 * 0.1;
#X obj 386 250 * 0.1;
#X obj 451 228 nbx 5 14 -1e+37 1e+37 0 0 empty empty empty 0 -6 0 10
-262144 -1 -1 0 256;
#X obj 451 250 * 0.1;
#X obj 313 -49 openpanel;
#X msg 294 -7 open \$1;
#X obj 328 -84 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X connect 1 0 0 0;
#X connect 2 0 0 1;
#X connect 3 0 8 0;
#X connect 4 0 5 0;
#X connect 5 0 6 0;
#X connect 7 0 4 0;
#X connect 8 0 7 0;
#X connect 9 0 10 0;
#X connect 10 0 4 1;
#X connect 11 0 12 0;
#X connect 12 0 4 2;
#X connect 13 0 14 0;
#X connect 14 0 4 3;
#X connect 15 0 17 0;
#X connect 16 0 18 0;
#X connect 17 0 5 1;
#X connect 18 0 5 2;
#X connect 19 0 20 0;
#X connect 20 0 5 3;
#X connect 21 0 22 0;
#X connect 22 0 8 0;
#X connect 23 0 21 0;
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