/usr/lib/pd/extra/Gem/alpha-help.pd is in gem 1:0.93.3-9build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | #N canvas 0 0 707 412 10;
#X text 452 8 GEM object;
#X obj 8 296 cnv 15 430 100 empty empty empty 20 12 0 14 -233017 -66577
0;
#X text 37 295 Inlets:;
#X text 453 355 Outlets:;
#X text 461 366 Outlet 1: gemlist;
#X obj 8 256 cnv 15 430 30 empty empty empty 20 12 0 14 -195568 -66577
0;
#X text 17 255 Arguments:;
#X obj 8 76 cnv 15 430 175 empty empty empty 20 12 0 14 -233017 -66577
0;
#X obj 449 77 cnv 15 250 250 empty empty empty 20 12 0 14 -228992 -66577
0;
#X text 453 60 Example:;
#X obj 584 254 cnv 15 100 60 empty empty empty 20 12 0 14 -195568 -66577
0;
#N canvas 0 22 450 300 gemwin 0;
#X obj 132 136 gemwin;
#X obj 67 89 outlet;
#X obj 67 10 inlet;
#X obj 67 41 route create;
#X msg 67 70 set destroy;
#X msg 142 68 set create;
#X msg 132 112 create \, 1;
#X msg 198 112 destroy;
#X connect 2 0 3 0;
#X connect 3 0 4 0;
#X connect 3 0 6 0;
#X connect 3 1 5 0;
#X connect 3 1 7 0;
#X connect 4 0 1 0;
#X connect 5 0 1 0;
#X connect 6 0 0 0;
#X connect 7 0 0 0;
#X restore 589 293 pd gemwin;
#X msg 589 274 create;
#X text 585 253 Create window:;
#X text 71 31 Class: manipulation object;
#X obj 451 197 cnv 15 80 60 empty empty empty 20 12 0 14 -24198 -66577
0;
#X obj 579 186 color 1 0 0 0.5;
#X text 60 319 Inlet 1: float: turn alpha blending on/off;
#X text 63 266 blending function (default: GL_ONE_MINUS_SRC_ALPHA)
;
#X text 50 12 Synopsis: [alpha];
#X text 29 77 Description: enable alpha blending;
#X obj 458 310 square;
#X obj 458 233 alpha;
#X obj 458 108 color 0 1 0 0.5;
#X text 61 308 Inlet 1: gemlist;
#X text 60 331 Inlet 1: message "auto 1" | "auto 0" turn on/off automatic
depth detection;
#X floatatom 583 139 5 0 0 0 - - -;
#X obj 458 86 gemhead 51;
#X obj 579 211 sphere;
#X obj 458 137 rotate 114 0 1 0;
#X floatatom 482 213 1 0 1 0 - - -;
#X obj 579 162 gemhead 50;
#X msg 474 176 auto \$1;
#X obj 474 158 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X msg 583 108 0 1 0 \$1;
#X floatatom 583 88 5 0 1 0 - - -;
#X obj 509 205 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X text 22 91 [alpha] turns on and off alpha blending. [alpha] automatically
uses the glBlendFunc(GL_SRC_ALPHA \, GL_ONE_MINUS_SRC_ALPHA) function
from OpenGL. If you want a different blending technique \, you will
need to make your own external. The blending that [alpha] does is the
stereotypical blending which you will usually want. In a nutshell \,
any pixel which has an alpha component will be blended with the pixel
that is in the frame buffer \, producing the usual colored glass effect.
Be aware that the rendering order matters \, so you probably want to
set the gemhead order number high so that the object is rendered after
all of the non-alpha blended ones.;
#X text 61 356 Inlet 2: float: blending function: 0=GL_ONE \, 1=GL_ONE_MINUS_SOURCE_ALPHA
;
#X obj 628 88 hsl 64 15 0 1 0 0 empty empty empty -2 -8 0 10 -262144
-1 -1 0 1;
#X connect 11 0 12 0;
#X connect 12 0 11 0;
#X connect 16 0 28 0;
#X connect 22 0 21 0;
#X connect 23 0 29 0;
#X connect 26 0 29 1;
#X connect 27 0 23 0;
#X connect 29 0 22 0;
#X connect 30 0 22 0;
#X connect 31 0 16 0;
#X connect 32 0 22 0;
#X connect 33 0 32 0;
#X connect 34 0 23 1;
#X connect 35 0 34 0;
#X connect 36 0 22 1;
#X connect 39 0 35 0;
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