Stripe shader

stripe.glsl

#version 120

uniform float rows;
uniform float cols;

void main()
{
	int x = int(floor(gl_TexCoord[0].x * cols));
	int y = int(floor(gl_TexCoord[0].y * rows));
	if (mod(x + y, 2) == 0) {
		gl_FragColor = vec4(1);
	} else {
		gl_FragColor = vec4(0, 0, 0, 1);
	}
}