Chromatic Aberration shader

ChromaticAberration.frag

#import "Common/ShaderLib/GLSLCompat.glsllib"
#import "Common/ShaderLib/MultiSample.glsllib"

uniform COLORTEXTURE m_Texture;
uniform float m_Offset;
varying vec2 texCoord;

void main() {
  vec4 color = vec4(0.0);
  color.r = texture2D(m_Texture, texCoord + vec2(m_Offset, 0.0)).r;
  color.g = texture2D(m_Texture, texCoord + vec2(0.0, 0.0)).g;
  color.b = texture2D(m_Texture, texCoord + vec2(-m_Offset, 0.0)).b;
  color.a = 1.0;
  gl_FragColor = color;
}

ChromaticAberrationFilter.java

public class ChromaticAberrationFilter extends Filter {

  private RenderManager renderManager;
  private ViewPort viewPort;

  public ChromaticAberrationFilter() {
    super("ChromaticAberrationFilter");
  }

  @Override
  protected void initFilter(AssetManager manager, RenderManager renderManager, ViewPort vp, int w, int h) {
    this.renderManager = renderManager;
    this.viewPort = vp;
    material = new Material(manager, "Post/ChromaticAberration.j3md");
    material.setFloat("Offset", 0.0008f);
  }

  @Override
  protected void postQueue(RenderQueue queue) {
    renderManager.getRenderer().setBackgroundColor(ColorRGBA.BlackNoAlpha);
    renderManager.getRenderer().clearBuffers(true, true, true);
    renderManager.renderViewPortQueues(viewPort, false);
    renderManager.setForcedTechnique(null);
    renderManager.getRenderer().setFrameBuffer(viewPort.getOutputFrameBuffer());
  }

  @Override
  protected void cleanUpFilter(Renderer r) {
  }

  @Override
  protected Material getMaterial() {
    return material;
  }
}