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AppGameKit Classic Chat / Shader request

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nz0
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Posted: 12th Mar 2013 13:09
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Not having any experience of writing shaders, would someone be kind enough to produce me a shader that simply allows the textures to be UV shifted?

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lilpissywilly
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Posted: 12th Mar 2013 20:06
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I second this. Or at least some sort of hint where to begin

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kamac
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Posted: 13th Mar 2013 21:35
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Since nobody tells what to do here, I'll speak.
Here you go:

Vertex shader:


Fragment shader:


The only change is in fragment shader. Namely, I've added uniform vec2 uvShift, and in texture2D I've summed uvVarying with uvShift.
If you want to, for example, scroll your texture 2 units to the right, then just set uvShift to -2,0.

Hope it's clear.

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nz0
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Posted: 13th Mar 2013 23:46
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Sir, you are a star.

Works a treat!!

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lilpissywilly
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Posted: 13th Mar 2013 23:47 Edited at: 13th Mar 2013 23:47
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Haha damn. I just spent the night working on this too

http://forum.thegamecreators.com/?m=forum_view&t=201508&b=41&msg=2441096#m2441096

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kamac
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Posted: 14th Mar 2013 07:28 Edited at: 14th Mar 2013 07:33
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Quote: "Sir, you are a star."


You're welcome

It was actually very, very easy.

PS.
Why not use SetSpriteUVOffset ?

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nz0
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Posted: 14th Mar 2013 10:48
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It's for a 3d primitive

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kamac
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Posted: 14th Mar 2013 15:54
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Alright, good to know

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Cliff Mellangard 3DEGS
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Posted: 14th Mar 2013 18:29 Edited at: 14th Mar 2013 18:30
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Why do you do it in the pixel shader?

It should be done in the vertex shader.

An object that is 256x256 in size and use the same screen space as its size.
So do you do the simple calculation 65536 times each time its drawn.

But if you do it on an object with 2 vertexes and in the vertex shader so is this done 2 times and do the same thing.

Anything that can be done in the vertex shader should be done there.

But there is simply alot that have to be done in the fragment shader.

Shaders are very slow on mobiles
Thats why iam many times writing! anything that can be done in the vertex do it there

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lilpissywilly
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Posted: 14th Mar 2013 19:05
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Mine is done with vertex. Simply play with setShaderConstantByName(myShader, "startuv", startuvX#, startuvY#, 0, 0); to get desired results

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Cliff Mellangard 3DEGS
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Posted: 14th Mar 2013 19:15
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Quote: "Mine is done with vertex. Simply play with setShaderConstantByName(myShader, "startuv", startuvX#, startuvY#, 0, 0); to get desired results"

Looked at your shaders and thanks for sharing with the others
Did you get yours to work on mobiles as i posted an sample there that works.

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lilpissywilly
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Posted: 14th Mar 2013 19:44
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That was more aimed at nz0

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kamac
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Posted: 14th Mar 2013 22:50 Edited at: 14th Mar 2013 22:52
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Cliff Mellangard 3DEGS, that's right. Fixed:

Vertex


Fragment


Althrough sum operation is barely slowing down anything even when used in huge amounts.

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