Re: 2D textures with OpenGL and GLUT

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On Wed, Jul 2, 2014 at 8:06 AM, Elise Huard <[email protected]> wrote:

> Hi,
> I've been trying to get a texture mapped onto a circle.
> I've pounded my head against this problem for a good while,
> been reading lots of posts about how to do it in C,
>

For folks who are experienced with low-level Haskell I actually recommend
they use the OpenGLRaw library as it matches C examples more closely.
Although, if you're a Haskell beginner that may just be an extra hassle.


> reproduced those as much as possible,
> but the best I get is a fairly distorted texture
>  (I'm working with a basic checkerboard as displayed in the Redbook4
> examples of GLUT,
> just to make sure I've got it right before moving on to actual images).
> Code here:
> loading texture
> https://github.com/elisehuard/game-prototype/blob/master/src/Main.hs#L90
> using the texture in a circle (mapping):
> https://github.com/elisehuard/game-prototype/blob/master/src/Main.hs#L130


It's hard to say what's going on with all those unsafeCoerce in there.


>
> the result is here
> https://github.com/elisehuard/game-prototype/blob/master/images/texture.jpg
>
> (as you can see, it is not a checkerboard)
> My aim is to make a 2D game to start with, so the perspective is
> orthogonal,
> I don't know if that helps.
>

Lots of things can be orthogonal, but I believe in this case that
orthographic is the word you want :)

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><br><div class=3D"gmail=
_quote">On Wed, Jul 2, 2014 at 8:06 AM, Elise Huard <span dir=3D"ltr">&lt;<=
a href=3D"mailto:[email protected]" target=3D"_blank">hopengl@elisehuar=
d.be</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">Hi,<br>
I&#39;ve been trying to get a texture mapped onto a circle.<br>
I&#39;ve pounded my head against this problem for a good while,<br>
been reading lots of posts about how to do it in C,<br></blockquote><div><b=
r></div><div>For folks who are experienced with low-level Haskell I actuall=
y recommend they use the OpenGLRaw library as it matches C examples more cl=
osely. Although, if you&#39;re a Haskell beginner that may just be an extra=
 hassle.</div>
<div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8=
ex;border-left:1px #ccc solid;padding-left:1ex">
reproduced those as much as possible,<br>
but the best I get is a fairly distorted texture<br>
=C2=A0(I&#39;m working with a basic checkerboard as displayed in the Redboo=
k4<br>
examples of GLUT,<br>
just to make sure I&#39;ve got it right before moving on to actual images).=
<br>
Code here:<br>
loading texture<br>
<a href=3D"https://github.com/elisehuard/game-prototype/blob/master/src/Mai=
n.hs#L90" target=3D"_blank">https://github.com/elisehuard/game-prototype/bl=
ob/master/src/Main.hs#L90</a><br>
using the texture in a circle (mapping):<br>
<a href=3D"https://github.com/elisehuard/game-prototype/blob/master/src/Mai=
n.hs#L130" target=3D"_blank">https://github.com/elisehuard/game-prototype/b=
lob/master/src/Main.hs#L130</a></blockquote><div><br></div><div>It&#39;s ha=
rd to say what&#39;s going on with all those unsafeCoerce in there.</div>
<div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex"><br>
<br>
the result is here<br>
<a href=3D"https://github.com/elisehuard/game-prototype/blob/master/images/=
texture.jpg" target=3D"_blank">https://github.com/elisehuard/game-prototype=
/blob/master/images/texture.jpg</a><br>
<br>
(as you can see, it is not a checkerboard)<br>
My aim is to make a 2D game to start with, so the perspective is orthogonal=
,<br>
I don&#39;t know if that helps.<br></blockquote><div><br></div><div>Lots of=
 things can be orthogonal, but I believe in this case that orthographic is =
the word you want :)</div><div><br></div><div><br></div></div></div></div>

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