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uniform sampler2D textures[2];
varying mediump vec2 texcoord;
void main()
{
mediump float x0 = (floor(texcoord.x * 512.0 - 0.25) + 0.5)/512.0;
mediump float x1 = (floor(texcoord.x * 512.0 + 0.25) + 0.5)/512.0;
mediump float y0 = (floor(texcoord.y * 512.0 + 0.25) + 0.5)/512.0;
mediump float y1 = (floor(texcoord.y * 512.0 - 0.25) + 0.5)/512.0;
mediump vec2 modifiedCoord0 = vec2(texcoord.x, (floor(texcoord.y * 512.0 + 0.25) + 0.5)/512.0);
mediump vec2 modifiedCoord1 = vec2(texcoord.x, (floor(texcoord.y * 512.0 - 0.25) + 0.5)/512.0);
mediump float ymix = (sin(texcoord.y * 1024.0 * 3.14159265359) + 1.0) * 0.5;
mediump float xmix = (sin(texcoord.x * 1024.0 * 3.14159265359) + 1.0) * 0.5;
gl_FragColor = mix(
mix(
texture2D(textures[1], vec2(x0, y1)),
texture2D(textures[0], vec2(x0, y0)),
ymix
),
mix(
texture2D(textures[1], vec2(x1, y1)),
texture2D(textures[0], vec2(x1, y0)),
ymix
),
xmix
);
}
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