#ifndef HERO_CUTOUT_INCLUDED
#define HERO_CUTOUT_INCLUDED

// Screen-space radial "hero cutout": clips occluder fragments that sit inside a circle around the
// on-screen player AND in front of it, punching a clean see-through hole toward the character.
//
// These two globals are driven every frame by HeroCutout.cs (Shader.SetGlobalVector). They live
// OUTSIDE UnityPerMaterial, so the SRP Batcher is unaffected. When the effect is disabled
// (_HeroCutoutDepthOn.y < 0.5, also the zero-initialised default) ApplyHeroCutout early-outs and the
// shader renders exactly like URP/Lit.
//   _HeroCutoutPosRadius : xy = hero viewport pos (0..1, bottom-left), z = radius, w = feather
//                          radius/feather are in normalized viewport-HEIGHT units
//   _HeroCutoutDepthOn   : x = hero eye-space depth (incl. bias), y = enabled (0/1)
float4 _HeroCutoutPosRadius;
float4 _HeroCutoutDepthOn;

// Interleaved-gradient noise -> screen-door dither, gives the circle a soft edge with no extra
// textures or includes.
float HeroCutoutDither(float2 positionSS)
{
    return frac(52.9829189 * frac(dot(positionSS, float2(0.06711056, 0.00583715))));
}

void ApplyHeroCutout(float4 positionCS)
{
    if (_HeroCutoutDepthOn.y < 0.5)
        return;

    // Flip-correct screen UV (matches Camera.WorldToViewportPoint's bottom-left convention).
    float2 uv = GetNormalizedScreenSpaceUV(positionCS);
    float2 delta = uv - _HeroCutoutPosRadius.xy;
    delta.x *= _ScreenParams.x / max(_ScreenParams.y, 1.0); // aspect-correct -> a round circle
    float dist = length(delta);

    float radius = _HeroCutoutPosRadius.z;
    float feather = max(_HeroCutoutPosRadius.w, 1e-4);
    float inside = 1.0 - smoothstep(radius - feather, radius, dist); // 1 inside, 0 outside

    // Only hole geometry between the camera and the hero; anything at/behind the player stays solid.
    float eyeDepth = LinearEyeDepth(positionCS.z, _ZBufferParams);
    float inFront = step(eyeDepth, _HeroCutoutDepthOn.x);

    float cut = inside * inFront;
    clip(HeroCutoutDither(positionCS.xy) - cut);
}
#endif