#version 450 core
in vec4 vPosID;
in vec4 vCol;
in vec4 vCenterSize;
in vec4 vControls;
layout (location=0) out vec4 fCol;
layout (location=1) out vec4 fPos;
layout (location=2) out vec4 fNorm;
void main()
{
    // there are quite a few intricate controls concerning the normals
    // we want normals to be bigger towards the center, so that when two clouds
    // are blended central normals predominate
    // similarly, we want normals to be bigger the further up the cloud is
    // finally, we want normals to allow for shadows at the edge of a cloud
    // when a light is direcly above the cloud
    float d = dot(vControls,vControls);
    if (d > 1) {discard;}
    fCol = vec4(vCol.xyz,vCol.w*(1-d));
    //fCol = vCol;
    //float rad = vCenterSize.w*0.5;
    float rad = vCenterSize.w;
    float h = (1-d) * rad;
    fPos = vec4(vPosID.xy, vPosID.z + h, vCol.w*(1-d));
    //vec3 vCen = 
    //vec3 fn1 = fPos.z*normalize(vec3(vCenterSize.xyz - fPos.xyz));
    vec3 fn1 = fPos.z*normalize(vec3(vCenterSize.xy - vPosID.xy,0));
    //fNorm = vec4(fn1,fPos.w);
    fNorm = vec4(vControls.xy, 0.1 ,fPos.w);
}