uniform float tOffset;
uniform float time[2];
const float twopi = 6.2828;
const float range = 0.25;

varying vec2 uv;

void main() {
	uv = gl_MultiTexCoord0.xy;
	gl_Position = ftransform();
	
	vec4 col = gl_Color * ((1.0 - range) + range * sin((time[0] + tOffset) * twopi) * cos((time[1] + tOffset) * twopi));
	
	gl_FrontColor = col;
	gl_BackColor = col;
}