Posterise fullscreen shader - GameCreators Forum

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baxslash

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Joined: 26th Dec 2006

Location: Duffield

Posted: 19th Jan 2015 11:04 Edited at: 19th Jan 2015 11:37

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Here's a nice simple posterise shader. Pretty useful example for a fullscreen shader:

+ Code Snippet

#ifdef GL_ES
	#ifdef GL_FRAGMENT_PRECISION_HIGH   
		precision highp float;
	#else
		precision mediump float;
	#endif
#endif

uniform sampler2D texture0;
varying vec2 uvVarying;

uniform float gamma;
uniform float numColors;

void main() 
{ 
  vec3 c = texture2D(texture0, uvVarying.xy).rgb;
  c = pow(c, vec3(gamma, gamma, gamma));
  c = c * numColors;
  c = floor(c);
  c = c / numColors;
  c = pow(c, vec3(1.0/gamma));
  gl_FragColor = vec4(c, 1.0);
}

Example image:

Some other superb examples here: http://www.geeks3d.com/shader-library/

Using AppGameKit V2 Tier 1

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BatVink

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Joined: 4th Apr 2003

Location: Gods own County, UK

Posted: 19th Jan 2015 14:16

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Some nice shaders there.

What I need is a tutorial that shows how to work with shaders in AGK. Not a specific shader but how to implement them and understand how to apply it to any shader. I seem to have a mental block for shaders!

There's a space in the newsletter for anyone who wants to take up the challenge!

Quidquid latine dictum sit, altum sonatur

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baxslash

Valued Member

Bronze Codemaster

17

Years of Service

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Joined: 26th Dec 2006

Location: Duffield

Posted: 19th Jan 2015 14:36 Edited at: 19th Jan 2015 14:37

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I'm not really very knowledgeable about shaders. Most of what I've been doing is hacking other people's hard work

I've mainly been messing around with pixel shaders used on quads and had all sorts of odd little problems. I finally have my "Game Over" shader working for my latest WIP:

If you get stuck I might be able to write something simple about fullscreen shaders in general but I wouldn't really know what I'm talking about...

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AppGameKit Classic Chat / Posterise fullscreen shader

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