blender-archive/source/blender/gpu/shaders/gpu_shader_diag_stripes_frag.glsl

uniform vec4 color1;
uniform vec4 color2;
uniform int size1;
uniform int size2;

#if __VERSION__ == 120
  #define fragColor gl_FragColor
#else
  out vec4 fragColor;
#endif

void main()
{
	float phase = mod((gl_FragCoord.x + gl_FragCoord.y), (size1 + size2));

	if (phase < size1)
	{
		fragColor = color1;
	}
	else {
		fragColor = color2;
	}
}