Dither shaders? - GameCreators Forum

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RayG

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Posted: 28th Oct 2014 07:09

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Hello, I was wondering if it was possible to make a shader that can dither the screen in darkbasic? I found 2 shaders, one for unity and one for opengl, but these don't work in Dasrkbasic... Or at least I don't know how to do make them work. Anyway, if anyone can that would be great as I think the effect looks interesting and more people than me would find it usefull. Thanks!

Here are two example
http://wiki.unity3d.com/index.php/Dithering_Shader

http://stackoverflow.com/questions/8032006/glsl-gif-dither-effect-optimization

Thanks again.

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ShellfishGames

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Posted: 28th Oct 2014 16:24

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I don't quite get what the shader is supposed to do, but you can generally apply fullscreen shaders in DBP using the image kit plugin. It's relatively easy, you simply draw your scene to a render target (and not directly to the screen) and then apply the shader effect to that render target by pasting it with "ik paste image myScene, 0, 0, myEffect". The Effect is an .fx file, I believe image kit comes with a bunch of examples that show how to write those shaders. You could more or less copy what the shader posted in the stack overflow post does, just have to change the structure to fit the required format.

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chafari

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Posted: 28th Oct 2014 18:37 Edited at: 28th Oct 2014 18:38

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Hi there. I have use a piece of code to make some filters in my painting program. We could add 2D box , circle ,Ellipse and so on. We could use it even in real time, but is too slow .Here is part of the code.

+ Code Snippet

autocam off
sync on
color backdrop 0
for i= 1 to 100
   make object box i,5+rnd(15),5+rnd(15),5+rnd(15)
   position object i,rnd(250),rnd(30),rnd(250)
   a=rnd(255)
   rem color object i,rgb(rnd(255),rnd(255),rnd(255))  rem colours
   color object i,rgb(a,a,a)                           rem black/white
next i

value=20    rem play with this value
position camera 50,50,-50
point camera 0,0,0
do
for x= 0 to 640 step 10
   for y= 0 to 480 step 10
     col=point(x,y)
     ink col
     circle x,y,value
   next y
next x


control camera using arrowkeys 0,5,5
a#=wrapvalue(a#+mousemovex()/2)
cam#=wrapvalue(cam#+mousemovey()/2)
rotate camera cam#,a#,0
if leftkey() then move camera left 0,5
if rightkey() then move camera right 0,5
sync
loop