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#X obj 0 0 doc_h gf/;
#X obj 3 1251 doc_also;
#X obj 0 1271 doc_f;
#X obj 3 308 gf/gl;
#X obj 103 1251 GEMglVertex3f;
#X obj 193 1251 GEMglColor3f;
#X obj 277 1251 GEMglBegin;
#X obj 349 1251 GEMglEnd;
#X text 409 1251 etc...;
#X text 246 40 use OpenGL commands in a different way than in GEM (for
use with GEM);
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#X obj 97 685 doc_m i0 begin;
#X obj 97 997 doc_m i0 end;
#X obj 97 1032 doc_m i0 vertex;
#X text 232 742 0 or "points" does GL_POINTS;
#X text 232 764 1 or "triangles" does GL_TRIANGLES;
#X text 232 786 2 or "triangle_strip" does GL_TRIANGLE_STRIP;
#X text 232 808 3 or "quads" does GL_QUADS;
#X text 232 830 4 or "quad_strip" does GL_QUAD_STRIP;
#X text 232 852 5 or "polygon" does GL_POLYGON;
#X text 232 874 6 or "triangle_fan" does GL_TRIANGLE_FAN;
#X text 232 896 7 or "lines" does GL_LINES;
#X text 232 918 8 or "line_loop" does GL_LINE_LOOP;
#X text 232 940 9 or "line_strip" does GL_LINE_STRIP;
#X text 232 962 takes 3 or 4 float arguments. Sets the colour of the
upcoming vertex.;
#X text 232 685 begin a new GL geo.;
#X text 232 997 finish making the current GL geo after all vertices
have been added.;
#X text 232 1032 takes 2 \, 3 or 4 float arguments and append a new
vertex to the geo.;
#X text 232 707 \$1 is a float or symbol for the shape type (which
decides how the edges will connect the vertices);
#X obj 3 53 gemhead;
#X obj 54 29 loadbang;
#X msg 3 281 end;
#X obj 31 201 t f f;
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#X obj 31 243 *;
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#X obj 58 243 *;
#X obj 69 108 gf/gl;
#X obj 31 182 *;
#X obj 31 144 for 0 1 0.005;
#X msg 69 89 scale 4 4 1 \, begin triangles;
#X obj 116 165 + 0.1;
#X msg 54 48 create \, 1;
#X text 246 74 this page will not document the whole of the [gf/gl]
interface \, because it is extremely long and complex and corresponds
quite directly to what you can find in the OpenGL reference manuals
for the C language. Instead \, let's see what is different between
the manual (as seen on http://opengl.org/ \, for example) and [gf/gl]
\, and let's also see how it differs from GEM.;
#X text 245 171 first \, note that although you'd normally still use
[gf/gl] by using a [gemwin] and a [gemhead] \, you don't actually need
the contents of [gemhead]'s message at all \, and instead you may use
bang or whatever else. no need for [repeat].;
#X text 244 245 then note that 'glBegin' \, instead of being mapped
to a class named [GEMglBegin] \, it is mapped to a method named 'begin'
in class [gf/gl]. Likewise for all other functions of OpenGL \, which
lose the initial two letters "gl" \, and which are lowercased. The
non-first uppercases also get a underscore \, and thus 'glLoadMatrix'
becomes 'load_matrix'.;
#X obj 86 165 f 60;
#X msg 120 142 60;
#X obj 54 67 gemwin 30;
#X obj 3 72 t b b b;
#X msg 31 281 color 0.5 \$1 \$2 \, vertex \$1 \$2;
#X text 245 329 then note that for 'glVertex2fv' \, the final 'v' is
stripped \, as there is no functional difference with the other function
'glVertex2f'. Then the 'f' is also stripped (because Pd doesn't support
any other data types than 'f' \, so there is no functional difference
with 'glVertex2d' or 'glVertex2s'. Then the '2' is also stripped \,
because the proper variant of glVertex is chosen at runtime depending
on the list of arguments being given. Thus you have to write it as
just 'vertex' \, with 2 \, 3 or 4 arguments.;
#X text 245 452 then \, all GLenum macros such as GL_POINTS are lowercased
and the first three characters "GL_" are removed. Thus "GL_POINTS"
*has* to be written as just "points" instead. Or else \, you can write
the same number as you'd had to write if you were using GEMgl.;
#X text 245 526 it's not decided yet what will happen with function
name uppercase suffixes like '1D' '2D' '3D' where 'D' means dimension.
they are currently lowercased and kept.;
#X text 245 580 not all functions are implemented yet.;
#X msg 118 50 destroy;
#X text 158 1079 ALSO HAS 115 OTHER METHODS (SOME OF WHICH DON'T WORK
\, BUT MOST OF WHICH HAVEN'T BEEN TRIED YET). If you would like help
on using that extra functionality \, please contact gridflow-dev. Also
\, look at this :;
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