#version 410 compatibility

uniform sampler2D gvis_tex, field_tex;

void main()
{
	vec4 gridcol = texture2D(gvis_tex, gl_TexCoord[0].st);
	float field = -texture2D(field_tex, gl_TexCoord[1].st).x;

	gl_FragColor.rgb = gridcol.rgb + vec3(field, field, field);
	gl_FragColor.a = 1.0;
}