export default /* glsl */ `
#ifdef SOFT_PARTICLES

    uniform sampler2D depthTexture;
    uniform vec4 projParams;
    uniform vec2 softParams;

    varying vec4 projPosition;
    varying float linearDepth;

    #define SOFT_NEAR_FADE softParams.x
    #define SOFT_INV_FADE_DISTANCE softParams.y

    #define zNear projParams.x
    #define zFar projParams.y

    float linearize_depth(float d)
    {
        return (zFar * zNear) / (zFar - d * (zFar - zNear));
    }

#endif
`;