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// Scale2x scaler.
uniform sampler2D tex;
uniform sampler2D videoTex;
varying vec2 texStep; // could be uniform
varying vec2 coord2pi;
varying vec2 texCoord;
varying vec2 videoCoord;
vec4 scaleNx()
{
vec4 delta;
delta.xw = sin(coord2pi) * texStep;
delta.yz = vec2(0.0);
vec4 posLeftTop = texCoord.stst - delta;
vec4 posRightBot = texCoord.stst + delta;
vec4 left = texture2D(tex, posLeftTop.xy);
vec4 top = texture2D(tex, posLeftTop.zw);
vec4 right = texture2D(tex, posRightBot.xy);
vec4 bot = texture2D(tex, posRightBot.zw);
if (dot(left.rgb - right.rgb, top.rgb - bot.rgb) == 0.0 || left.rgb != top.rgb) {
return texture2D(tex, texCoord.st);
} else {
return top;
}
}
void main()
{
#if SUPERIMPOSE
vec4 col = scaleNx();
vec4 vid = texture2D(videoTex, videoCoord);
gl_FragColor = mix(vid, col, col.a);
#else
gl_FragColor = scaleNx();
#endif
}
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