uniform sampler2D tex;

varying vec3 vpos;

void main()
{
	const vec3 bg_color = vec3(0.5, 0.1, 1.0);
	vec3 grid_color = texture2D(tex, gl_TexCoord[0].st).xyz;

	float fog = min(abs(vpos.z) * 0.05, 1.0);

	gl_FragColor.xyz = mix(grid_color, bg_color, fog);
	gl_FragColor.a = 1.0;
}