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uniform sampler2D textures[2];
uniform mediump vec2 texsize;
varying mediump vec2 texcoord;
void main()
{
mediump float x0 = (floor(texcoord.x * texsize.x - 0.25) + 0.5)/texsize.x;
mediump float x1 = (floor(texcoord.x * texsize.x + 0.25) + 0.5)/texsize.x;
mediump float y0 = (floor(texcoord.y * texsize.y + 0.25) + 0.5)/texsize.y;
mediump float y1 = (floor(texcoord.y * texsize.y - 0.25) + 0.5)/texsize.y;
mediump float ymix = (sin(texcoord.y * texsize.y * 6.283185307) + 1.0) * 0.5;
mediump float xmix = (sin(texcoord.x * texsize.x * 6.283185307) + 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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