bgfx/3rdparty/glsl-optimizer/tests/fragment/zun-Hidden_Twirt_Effect_Shader-in.txt

struct v2f_vertex_lit {
    vec2 uv;
    vec4 diff;
    vec4 spec;
};
struct v2f_img {
    vec4 pos;
    vec2 uv;
};
struct appdata_img {
    vec4 vertex;
    vec2 texcoord;
};
struct v2f {
    vec4 pos;
    vec2 uv;
};
uniform vec4 _CenterRadius;
uniform sampler2D _MainTex;
uniform mat4 _RotationMatrix;
vec2 MultiplyUV( in mat4 mat, in vec2 inUV );
vec4 frag( in v2f i );
vec2 MultiplyUV( in mat4 mat, in vec2 inUV ) {
    vec4 temp;
    temp = vec4( inUV.x , inUV.y , 0.000000, 0.000000);
    temp = ( mat * temp );
    return temp.xy ;
}
vec4 frag( in v2f i ) {
    vec2 offset;
    vec2 distortedOffset;
    vec2 tmp;
    float t;
    offset = i.uv;
    distortedOffset = MultiplyUV( _RotationMatrix, offset.xy );
    tmp = (offset / _CenterRadius.zw );
    t = min( 1.00000, length( tmp ));
    offset = mix( distortedOffset, offset, vec2( t));
    offset += _CenterRadius.xy ;
    return texture2D( _MainTex, offset);
}
void main() {
    vec4 xl_retval;
    v2f xlt_i;
    xlt_i.pos = vec4(0.0);
    xlt_i.uv = vec2( gl_TexCoord[0]);
    xl_retval = frag( xlt_i);
    gl_FragData[0] = vec4( xl_retval);
}