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GLSL screen space checkerboard

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This, in the .frag shader will produce a screen-space checkboard.

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  1. vec2 pos = mod(gl_FragCoord.xy,vec2(100));
  2. 		if ((pos.x > 50.0)&&(pos.y > 50.0)){
  3. 			gl_FragColor=vec4(1.0, 1.0, 1.0, 1.0);
  4. 		}
  5. 		if ((pos.x < 50.0)&&(pos.y < 50.0)){
  6. 			gl_FragColor=vec4(1.0, 1.0, 1.0, 1.0);
  7. 		}
  8. 		if ((pos.x < 50.0)&&(pos.y > 50.0)){
  9. 			gl_FragColor=vec4(0.0, 0.0, 0.0, 1.0);
  10. 		}
  11. 		if ((pos.x > 50.0)&&(pos.y < 50.0)){
  12. 			gl_FragColor=vec4(0.0, 0.0, 0.0, 1.0);
  13. 		}

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