bgfx/3rdparty/glsl-optimizer/tests/vertex/zun-Hidden_TerrainEngine_BillboardTree-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;
    float fog;
    vec4 color;
    vec2 uv;
};
struct appdata_tree_billboard {
    vec4 vertex;
    vec4 color;
    vec4 texcoord;
    vec2 texcoord1;
};
uniform vec4 _TreeBillboardCameraFront;
uniform vec4 _TreeBillboardCameraPos;
uniform vec3 _TreeBillboardCameraRight;
uniform vec4 _TreeBillboardCameraUp;
uniform vec4 _TreeBillboardDistances;

void TerrainBillboardTree( inout vec4 pos, in vec2 offset, in float offsetz );
v2f vert( in appdata_tree_billboard v );
void TerrainBillboardTree( inout vec4 pos, in vec2 offset, in float offsetz ) {
    vec3 treePos;
    float treeDistanceSqr;
    float billboardAngleFactor;
    float radius;
    float billboardModeFactor;
    float billboardRootOffsetFactor;
    float absRadius;
    treePos = (pos.xyz  - _TreeBillboardCameraPos.xyz );
    treeDistanceSqr = dot( treePos, treePos);
    if ( (treeDistanceSqr > _TreeBillboardDistances.x ) ){
        offset.xy  = vec2( 0.000000);
    }
    pos.xyz  += (_TreeBillboardCameraRight.xyz  * offset.x );
    billboardAngleFactor = _TreeBillboardCameraPos.w ;
    radius = mix( offset.y , offsetz, billboardAngleFactor);
    billboardModeFactor = _TreeBillboardCameraUp.w ;
    billboardRootOffsetFactor = _TreeBillboardCameraFront.w ;
    absRadius = abs( radius );
    pos.xyz  += mix( ((((_TreeBillboardCameraUp.xyz  * max( 0.000000, radius)) * 2.00000) - (vec3( 0.000000, 1.00000, 0.000000) * absRadius)) - ((_TreeBillboardCameraUp.xyz  * absRadius) * billboardRootOffsetFactor)), (_TreeBillboardCameraUp.xyz  * radius), vec3( billboardModeFactor));
}
v2f vert( in appdata_tree_billboard v ) {
    v2f o;
    TerrainBillboardTree( v.vertex, v.texcoord1.xy , v.texcoord.y );
    o.pos = ( gl_ModelViewProjectionMatrix * v.vertex );
    o.fog = o.pos.z ;
    o.uv.x  = v.texcoord.x ;
    o.uv.y  = float( (v.texcoord.y  > 0.000000) );
    o.color = v.color;
    return o;
}
varying vec4 xlv_FOG;
void main() {
    v2f xl_retval;
    appdata_tree_billboard xlt_v;
    xlt_v.vertex = vec4( gl_Vertex);
    xlt_v.color = vec4( gl_Color);
    xlt_v.texcoord = vec4( gl_MultiTexCoord0);
    xlt_v.texcoord1 = vec2( gl_MultiTexCoord1);
    xl_retval = vert( xlt_v);
    gl_Position = vec4( xl_retval.pos);
    xlv_FOG = vec4( xl_retval.fog, 0.0, 0.0, 0.0);
    gl_FrontColor = vec4( xl_retval.color);
    gl_TexCoord[0] = vec4( xl_retval.uv, 0.0, 0.0);
}