Re: Help with VAOs

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Sorry, I'm going to be really vague here, as it's been a while.

glBegin()
glVertex(...)
[...]
glEnd()

is the "old" way, and you are right, you really  don't want to do that.

The "new" way is all the shader magic - it may be time to bite the bullet
and learn that.

But the semi-new way is to use Vertex Buffer OBjects (VBOs) to efficiently
store your vertices on the Card. A little googling should get you started.

-CHB



On Tue, Jan 27, 2015 at 12:36 PM, Johannes Bauer <[email protected]>
wrote:

> Hello list,
>
> I'm trying to store objects (currently only vertices) on the graphics
> card so that I can avoid lots of:
>
> glBegin()
> glVertex(...)
> [...]
> glEnd()
>
> I've tried lots and lots of code now (none of which fully did what I
> wanted) and really am losing my mind soon :-( I could adapt this to work
> with my code:
>
> https://gist.github.com/MorganBorman/4243336
>
> And it does work, but when integrated in my 3D environment I noticed
> that the drawn objects are not rendered perspectively, but just a flat
> object.
>
> I'm looking for the easiest way to dump a bunch of vertices onto the
> graphics card and later reference those vertices to draw some object and
> have it render as if I had used glBegin(), glVertex(), glEnd(). Is this
> possible at all? Which approach should I look into?
>
> In general I've seen two different approaches, one that involes (usually
> super-primitive) shaders, others do not. I do not see why I would need a
> custom-shader for this task, is this really necessary?
>
> My goal ultimately is to store surfaces (i.e. vertices, their normals,
> their texture UV coordinates) on the graphics card.
>
> Any help is greatly appreciated,
> Johannes
>
>
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming. The Go Parallel Website,
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> hub for all things parallel software development, from weekly thought
> leadership blogs to news, videos, case studies, tutorials and more. Take a
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-- 

Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
NOAA/NOS/OR&R            (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
Seattle, WA  98115       (206) 526-6317   main reception

[email protected]

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<div dir=3D"ltr">Sorry, I&#39;m going to be really vague here, as it&#39;s =
been a while.<div><br></div><div><span style=3D"font-size:12.8000001907349p=
x">glBegin()</span><br style=3D"font-size:12.8000001907349px"><span style=
=3D"font-size:12.8000001907349px">glVertex(...)</span><br style=3D"font-siz=
e:12.8000001907349px"><span style=3D"font-size:12.8000001907349px">[...]</s=
pan><br style=3D"font-size:12.8000001907349px"><span style=3D"font-size:12.=
8000001907349px">glEnd()</span><br></div><div><span style=3D"font-size:12.8=
000001907349px"><br></span></div><div><span style=3D"font-size:12.800000190=
7349px">is the &quot;old&quot; way, and you are right, you really =C2=A0don=
&#39;t want to do that.</span></div><div><span style=3D"font-size:12.800000=
1907349px"><br></span></div><div><span style=3D"font-size:12.8000001907349p=
x">The &quot;new&quot; way is all the shader magic - it may be time to bite=
 the bullet and learn that.</span></div><div><span style=3D"font-size:12.80=
00001907349px"><br></span></div><div><span style=3D"font-size:12.8000001907=
349px">But the semi-new way is to use Vertex Buffer OBjects (VBOs) to effic=
iently store your vertices on the Card. A=C2=A0little=C2=A0googling should =
get you=C2=A0started.</span></div><div><span style=3D"font-size:12.80000019=
07349px"><br></span></div><div><span style=3D"font-size:12.8000001907349px"=
>-CHB</span></div><div><span style=3D"font-size:12.8000001907349px"><br></s=
pan></div><div><span style=3D"font-size:12.8000001907349px"><br></span></di=
v></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue, J=
an 27, 2015 at 12:36 PM, Johannes Bauer <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:[email protected]" target=3D"_blank">[email protected]</a>&gt;</=
span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e=
x;border-left:1px #ccc solid;padding-left:1ex">Hello list,<br>
<br>
I&#39;m trying to store objects (currently only vertices) on the graphics<b=
r>
card so that I can avoid lots of:<br>
<br>
glBegin()<br>
glVertex(...)<br>
[...]<br>
glEnd()<br>
<br>
I&#39;ve tried lots and lots of code now (none of which fully did what I<br=
>
wanted) and really am losing my mind soon :-( I could adapt this to work<br=
>
with my code:<br>
<br>
<a href=3D"https://gist.github.com/MorganBorman/4243336" target=3D"_blank">=
https://gist.github.com/MorganBorman/4243336</a><br>
<br>
And it does work, but when integrated in my 3D environment I noticed<br>
that the drawn objects are not rendered perspectively, but just a flat<br>
object.<br>
<br>
I&#39;m looking for the easiest way to dump a bunch of vertices onto the<br=
>
graphics card and later reference those vertices to draw some object and<br=
>
have it render as if I had used glBegin(), glVertex(), glEnd(). Is this<br>
possible at all? Which approach should I look into?<br>
<br>
In general I&#39;ve seen two different approaches, one that involes (usuall=
y<br>
super-primitive) shaders, others do not. I do not see why I would need a<br=
>
custom-shader for this task, is this really necessary?<br>
<br>
My goal ultimately is to store surfaces (i.e. vertices, their normals,<br>
their texture UV coordinates) on the graphics card.<br>
<br>
Any help is greatly appreciated,<br>
Johannes<br>
<br>
---------------------------------------------------------------------------=
---<br>
Dive into the World of Parallel Programming. The Go Parallel Website,<br>
sponsored by Intel and developed in partnership with Slashdot Media, is you=
r<br>
hub for all things parallel software development, from weekly thought<br>
leadership blogs to news, videos, case studies, tutorials and more. Take a<=
br>
look and join the conversation now. <a href=3D"http://goparallel.sourceforg=
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_______________________________________________<br>
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_______________________________________________<br>
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get=3D"_blank">https://lists.sourceforge.net/lists/listinfo/pyopengl-users<=
/a><br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature"><br>Christopher Barker, Ph.D.<br>Oceanographer<br><br>=
Emergency Response Division<br>NOAA/NOS/OR&amp;R =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0(206) 526-6959=C2=A0=C2=A0 voice<br>7600 Sand Point Way NE=
 =C2=A0=C2=A0(206) 526-6329=C2=A0=C2=A0 fax<br>Seattle, WA =C2=A098115 =C2=
=A0 =C2=A0 =C2=A0=C2=A0(206) 526-6317=C2=A0=C2=A0 main reception<br><br><a =
href=3D"mailto:[email protected]" target=3D"_blank">[email protected]=
ov</a></div>
</div>

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look and join the conversation now. http://goparallel.sourceforge.net/
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