bgfx/3rdparty/glsl-optimizer/tests/fragment/zun-FX_Glass_Stained_BumpDistort-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 vertex;
    vec4 uvgrab;
    vec2 uvbump;
    vec2 uvmain;
};
struct appdata_t {
    vec4 vertex;
    vec2 texcoord;
};
uniform float _BumpAmt;
uniform sampler2D _BumpMap;
uniform sampler2D _GrabTexture;
uniform vec4 _GrabTexture_TexelSize;
uniform sampler2D _MainTex;
vec4 UnpackNormal( in vec4 packednormal );
vec4 frag( in v2f i );
vec4 UnpackNormal( in vec4 packednormal ) {
    vec4 normal;
    normal.xy  = ((packednormal.wy  * 2.00000) - 1.00000);
    normal.z  = sqrt( ((1.00000 - (normal.x  * normal.x )) - (normal.y  * normal.y )) );
    return normal;
}
vec4 frag( in v2f i ) {
    vec2 bump;
    vec2 offset;
    vec4 col;
    vec4 tint;
    bump = UnpackNormal( texture2D( _BumpMap, i.uvbump)).xy ;
    offset = ((bump * _BumpAmt) * _GrabTexture_TexelSize.xy );
    i.uvgrab.xy  = ((offset * i.uvgrab.z ) + i.uvgrab.xy );
    col = texture2DProj( _GrabTexture, i.uvgrab);
    tint = texture2D( _MainTex, i.uvmain);
    return (col * tint);
}
void main() {
    vec4 xl_retval;
    v2f xlt_i;
    xlt_i.vertex = vec4(0.0);
    xlt_i.uvgrab = vec4( gl_TexCoord[0]);
    xlt_i.uvbump = vec2( gl_TexCoord[1]);
    xlt_i.uvmain = vec2( gl_TexCoord[2]);
    xl_retval = frag( xlt_i);
    gl_FragData[0] = vec4( xl_retval);
}