shader language=GLSL
	vertex~
		void main(void) {
			gl_Position = ftransform();
			gl_TexCoord[0] = gl_MultiTexCoord0;
		}

	fragment~ filter=linear
		uniform sampler2D rubyTexture;
		
		void main(void) {   
			vec4 rgb = texture2D(rubyTexture, gl_TexCoord[0].xy);
			vec4 intens = smoothstep(0.2,0.8,rgb) + normalize(vec4(rgb.xyz, 1.0));
			
			if(fract(gl_FragCoord.y * 0.5) > 0.5) intens = rgb * 0.8;
			gl_FragColor = intens;
		}