uniform sampler2D edgeTex;

uniform sampler2D colorTex;

uniform sampler2D offsetTex;

uniform sampler2D weightTex;

uniform sampler2D videoTex;

varying vec2 mid;

varying vec2 leftTop;

varying vec2 edgePos;

varying vec2 weightPos;

varying vec2 texStep2; // could be uniform

varying vec2 videoCoord;

void main()

{

	// 12-bit edge information encoded as 64x64 texture-coordinate

	vec2 xy = texture2D(edgeTex, edgePos).ra;

	// extend to (64N x 64N) texture-coordinate

	xy = (floor(64.0 * xy) + fract(weightPos)) / 64.0;

	vec4 offsets = texture2D(offsetTex, xy);

	vec3 weights = texture2D(weightTex, xy).xyz;

	vec4 c5 = texture2D(colorTex, mid);

	vec4 cx = texture2D(colorTex, leftTop + texStep2 * offsets.xy);

	vec4 cy = texture2D(colorTex, leftTop + texStep2 * offsets.zw);

	vec4 col = cx * weights.x + cy * weights.y + c5 * weights.z;

#if SUPERIMPOSE

	vec4 vid = texture2D(videoTex, videoCoord);

	gl_FragColor = mix(vid, col, col.a);

#else

	gl_FragColor = col;

#endif

}