uniform sampler2D texture1;
uniform sampler2D texture2;
uniform sampler2D mask;
uniform float angle;
uniform mat2 textureMatrix;
varying vec4 color;

void main() {

    vec4 color1 = texture2D(texture1, gl_TexCoord[0].xy);
    vec4 color2 = texture2D(texture2, gl_TexCoord[0].xy);

    //mat2 textureMatrix = mat2(cos(angle), sin(angle), -sin(angle), cos(angle));

    float mask = texture2D(mask, textureMatrix*gl_TexCoord[0].xy).a;

    gl_FragColor = color * mix(color1, color2, mask);


}