viewport

//  ____            ___       ___  ____               __                       __      
// /\  _`\         /\_ \    /'___\/\  _`\            /\ \__                 __/\ \__   
// \ \,\L\_\     __\//\ \  /\ \__/\ \ \L\ \___   _ __\ \ ,_\  _ __    __   /\_\ \ ,_\  
//  \/_\__ \   /'__`\ \ \ \ \ ,__\ \ ,__/ __`\/'__\ \ \/ /'__\/'__`\ \/\ \ \ \/  
//    /\ \L\ \/\  __/ \_\ \_\ \ \_/ \ \ \/\ \L\ \ \ \/ \ \ \_\ \ \//\ \L\.\_\ \ \ \ \_ 
//    \ `\____\ \____\/\____\ \_\   \ \_\ \____/\ \_\  \ \__\ \_\ \__/.\_\ \_\ \__\
//     \/_____/\/____/\/____/ \/_/    \/_/\/___/  \/_/   \/__/ \/_/ \/__/\/_/ \/_/\/__/
//
// SPDX-License-Identifier: MIT
// Copyright Han, 2025

pragma solidity ^0.8.25;

contract SelfPortrait {
    event ArtpieceCreated(address indexed creator);
    event ArtpieceTransferred(address indexed oldOwner, address indexed newOwner);
    event BidAccepted(uint256 value, address indexed fromAddress, address indexed toAddress);
    event BidPlaced(uint256 value, address indexed fromAddress);
    event BidWithdrawn(uint256 value, address indexed fromAddress);
    event ListedForSale(uint256 value, address indexed fromAddress, address indexed toAddress);
    event SaleCanceled(uint256 value, address indexed fromAddress, address indexed toAddress);
    event SaleCompleted(uint256 value, address indexed fromAddress, address indexed toAddress);

    error FundsTransfer();
    error InsufficientFunds();
    error ListedForSaleToSpecificAddress();
    error NoBid();
    error NotForSale();
    error NotOwner();
    error NotRoyaltyRecipient();
    error NotYourBid();
    error NullAddress();
    error RoyaltyTooHigh();

    string public constant MANIFEST = (
        'Untitled.' '
'
    );

    string public constant CORE = (
        '"use strict";const credits="iq intersect and hash noise,  Dave_Hoskins hash";let 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e=prompt("Frames to render",s.save_frames);h.parser.searchParams.set("frames",e),window.location=h.parser.href;break;case"r":const t=prompt("Canvas size in pixels (max 8192)",c.height);t>=8&&t<=8192&&(h.parser.searchParams.set("res",t),window.location=h.parser.href);break;case"s":h.save.queued=!0}});let e=Float32Array.of(-1,1,-1,-1,1,1,1,-1);const t="#version 300 es"+h.newline+"precision highp float; in vec2 p; void main(){ gl_Position =vec4(p,1.0,1.0); }";let r="#version 300 es"+h.newline+"#ifdef GL_ES"+h.newline+"precision highp float;"+h.newline+"#endif"+h.newline+"const int AA=2;uniform vec2 u_resolution;uniform float u_time;uniform vec2 u_mouse;uniform sampler2D u_texture_0;uniform float u_chroma_offset;const vec3 f=vec3(.941176470588235),v=vec3(.901960784313726),m=vec3(.980392156862745),n=vec3(.5,3,3);float y;uniform bool u_animate_grid;"+h.newline+"#define R(a)mat2(cos(a),sin(a),-sin(a),cos(a))"+h.newline+"#define TAU 6.283185307"+h.newline+"#define PI 3.14159"+h.newline+"#define RANDOMS 32"+h.newline+"vec3 u=vec3(0);float r=1.f,T=0.f,c=0.f;vec2 a=vec2(0);vec4 i[RANDOMS];vec2 x=vec2(0);out vec4 fragColor;vec3 t(){vec3 f=gl_FragCoord.xyy,v;f=vec3(dot(f,vec3(127.1f,311.7f,74.7f)),dot(f,vec3(269.5f,183.3f,246.1f)),dot(f,vec3(113.5f,271.9f,124.6f)));v=-1.f+2.f*fract(sin(f)*43758.5453123f);return fract(555.f*sin(777.f*v))/256.f;}vec2 t(vec2 f){vec3 v=fract(vec3(f.xyx)*vec3(.1031,.103,.0973));v+=dot(v,v.yzx+33.33);return fract((v.xx+v.yz)*v.zy);}mat3 s(float f){float v=cos(f),m=sin(f);return mat3(1.,0.,0.,0.,v,-m,0.,m,v);}mat3 e(float f){float v=cos(f),m=sin(f);return mat3(v,0.,m,0.,1.,0.,-m,0.,v);}mat3 A(float f){float v=cos(f),m=sin(f);return mat3(v,-m,0.,m,v,0.,0.,0.,1.);}void A(out mat3 f,out float v,out float r){v=c;int m=int(t(a)*1e2),d=m%RANDOMS;vec4 n=i[d];vec2 y=n.xy,o=vec2(u.x*TAU);o.x*=max(y.x*3.,.5);o.y*=max(y.y*3.,.5);float x=y.x*TAU+o.x,z=y.y*TAU+o.y,T=u.x*TAU+n.z*TAU;f=e(T)*s(z)*A(x);r=1.;}bool A(vec3 f,vec3 v,vec3 m,out float r,out vec3 u){vec3 T=1./v,d=(-m-f)*T,y=(m-f)*T,n=min(d,y),o=max(d,y);float x=max(max(n.x,n.y),n.z),a=min(min(o.x,o.y),o.z);if(a<0.||x>a)return false;r=max(x,0.);u=x==n.x?vec3(-sign(v.x),0,0):x==n.y?vec3(0,-sign(v.y),0):vec3(0,0,-sign(v.z));return true;}float e(vec3 f,vec3 v,vec3 m){vec3 y=n;y+=vec3(sin(u.y*TAU),cos(u.y*TAU),0)*10.;y=normalize(f-y);float x=max(dot(v,y),0.f),d=max(dot(reflect(-y,v),-m),0.f),r=x*2.;r+=pow(max(1.f+dot(m,v),0.f),2.)*2.;r+=pow(d,1.)*1e-5;return r;}vec4 A(vec2 u,float y){vec3 x=m,n=vec3(0,0,-10.f+.001*T*r),d=normalize(vec3(0)-n),z=normalize(vec3(d.z,0,-d.x)),o=normalize(u.x*z+u.y*cross(d,z)+d/.2),a,c,s;mat3 U;float i,S,t;A(U,i,S);a=U*n;c=U*o;bool G=A(a,c,vec3(i),t,s);if(G&&t<1e2f){vec3 P=n+o*t,B=normalize(transpose(U)*s);x=mix(v,f,e(P,B,o));}return vec4(x,1);}void s(float f,float v,float y){float x=TAU*y*0.,m=1.f,d,o;m=.5f+.5f*sin(TAU*u_time/16./2.+x);d=(f-.2*m*v)/16.;o=(f-.9*m*v)/16.;T=v;r=m;u=vec3(d,o,f/16.);}float d(vec3 f){f=fract(f*.3183099+.1);f*=17.;return fract(f.x*f.y*f.z*(f.x+f.y+f.z));}float p(vec3 f){vec3 v=floor(f),y=fract(f);y=y*y*(3.-2.*y);return mix(mix(mix(d(v+vec3(0)),d(v+vec3(1,0,0)),y.x),mix(d(v+vec3(0,1,0)),d(v+vec3(1,1,0)),y.x),y.y),mix(mix(d(v+vec3(0,0,1)),d(v+vec3(1,0,1)),y.x),mix(d(v+vec3(0,1,1)),d(v+vec3(1)),y.x),y.y),y.z);}void A(){x=u_mouse/u_resolution;vec2 v=x*2.;for(float f=0.;f<float(RANDOMS);f++){float m=floor(f/20.),y=mod(f,20.);vec2 d=vec2(m,y);vec4 u=vec4(1);u.xy=t(d)*2.;u.z=p(vec3(d.x+v.x,d.y+v.y,2));i[int(f)]=u;}}void main(){y=u_animate_grid?(y=floor(fract(u_time/16.)*20./2.)*2.,max(y,1.)):20.;A();vec4 f=vec4(0,0,0,1),v;vec2 d=gl_FragCoord.xy;float x=.5f+.5f*sin(d.x*147.f)*sin(d.y*131.f);v=vec4(0,0,0,1);for(int r=0;r<AA;r++)for(int z=0;z<AA;z++){vec2 o=vec2(z,r)/float(AA)-.5f,n=(gl_FragCoord.xy+o-.5f*u_resolution.xy)/min(u_resolution.x,u_resolution.y),T=vec2(y),U=mod(T,2.f),i=vec2(0);float S=0.f;n*=1.f+.04;if(abs(n.x)<.5f&&abs(n.y)<.5f){vec2 G=(n+.5f*U)*T;n=fract(G)-.5f;a=floor(G)/T+.5f;n.y*=T.x/T.y;i=floor(G)+1.f;S=fract(sin(dot(i,vec2(12.9898f,78.233f)))*43758.5453f);float e=.5f*(1.f/2.)*(float(r*AA+z)+x)/float(AA*AA),P=u_time-e-S,B,b;s(P,0.f,S);v=texture(u_texture_0,floor(G)/T+.5f);B=(v.x+v.y+v.z)*.333f;b=mix(.95f,1.,.5f*cos(u.z*TAU)+.5f);B=smoothstep(1.,b,B);c=.2+B*.45;s(P,-1.f,S);f.x+=A(n,S).x;s(P,0.f,S);f.y+=A(n,S).y;s(P,1.f,S);f.z+=A(n,S).z;}else f+=vec4(m,1);}f/=float(AA*AA);f.xyz+=t();f.xyz=mix(f.xyz,v.xyz,0.);fragColor=vec4(f.xyz,1);}";if(mobile){const e="const int AA = 2";r=r.replace(e,"const int AA=1")}window.program=s.program=h.initProgram(r,t,e),h.render()}else{const e=d.createElement("div");e.style.cssText="align-items:center;background:#969696;color:#fff;display:flex;font-family:monospace;font-size:20px;height:100vh;justify-content:center;left:0;position:fixed;top:0;width:100vw;",e.innerHTML="Your browser does not support WebGL.",b.append(e)}};init();'
    );

    modifier onlyOwner() {
        if (owner != msg.sender) {
            revert NotOwner();
        }

        _;
    }

    modifier onlyRoyaltyRecipient() {
        if (royaltyRecipient != msg.sender) {
            revert NotRoyaltyRecipient();
        }

        _;
    }

    struct Offer {
        bool active;
        uint256 value;
        address toAddress;
    }

    struct Bid {
        bool active;
        uint256 value;
        address fromAddress;
    }

    address public owner;

    Offer public currentOffer;

    Bid public currentBid;

    address public royaltyRecipient;

    uint256 public royaltyPercentage;

    mapping (address => uint256) public pendingWithdrawals;

    constructor(uint256 _royaltyPercentage) {
        if (_royaltyPercentage >= 100) {
            revert RoyaltyTooHigh();
        }

        owner = msg.sender;
        royaltyRecipient = msg.sender;
        royaltyPercentage = _royaltyPercentage;

        emit ArtpieceCreated(msg.sender);
    }

    function name() public view virtual returns (string memory) {
        return 'SelfPortrait';
    }

    function symbol() public view virtual returns (string memory) {
        return 'HAN';
    }

    function artpiece() public view virtual returns (string memory) {
        return string.concat(
            '<!DOCTYPE html>'
            '<html>'
                '<head>'
                    '<title>', 'SelfPortrait', '</title>'

                    '<meta name="viewport" content="width=device-width, initial-scale=1" />'

                    '<style>html,body{background:#969696;margin:0;padding:0;overflow:hidden;}</style>'
                '</head>'

                '<body>'
                    '<script type="text/javascript">',
                        CORE,
                    '</script>'
                '</body>'
            '</html>'
        );
    }

    function withdraw() public {
        uint256 amount = pendingWithdrawals[msg.sender];

        pendingWithdrawals[msg.sender] = 0;

        _sendFunds(amount);
    }

    function transferOwnership(address newOwner) public onlyOwner {
        if (newOwner == address(0)) {
            revert NullAddress();
        }

        _transferOwnership(newOwner);

        if (currentBid.fromAddress == newOwner) {
            uint256 amount = currentBid.value;

            currentBid = Bid({ active: false, value: 0, fromAddress: address(0) });

            pendingWithdrawals[newOwner] += amount;
        }

        if (currentOffer.active) {
            currentOffer = Offer({ active: false, value: 0, toAddress: address(0) });
        }
    }

    function listForSale(uint256 salePriceInWei) public onlyOwner {
        currentOffer = Offer({ active: true, value: salePriceInWei, toAddress: address(0) });

        emit ListedForSale(salePriceInWei, msg.sender, address(0));
    }

    function listForSaleToAddress(uint256 salePriceInWei, address toAddress) public onlyOwner {
        currentOffer = Offer({ active: true, value: salePriceInWei, toAddress: toAddress });

        emit ListedForSale(salePriceInWei, msg.sender, toAddress);
    }

    function cancelFromSale() public onlyOwner {
        Offer memory oldOffer = currentOffer;

        currentOffer = Offer({ active: false, value: 0, toAddress: address(0) });

        emit SaleCanceled(oldOffer.value, msg.sender, oldOffer.toAddress);
    }

    function buyNow() public payable {
        if (!currentOffer.active) {
            revert NotForSale();
        }

        if (currentOffer.toAddress != address(0) && currentOffer.toAddress != msg.sender) {
            revert ListedForSaleToSpecificAddress();
        }

        if (msg.value != currentOffer.value) {
            revert InsufficientFunds();
        }

        currentOffer = Offer({ active: false, value: 0, toAddress: address(0) });

        uint256 royaltyAmount = _calcRoyalty(msg.value);

        pendingWithdrawals[owner] += msg.value - royaltyAmount;
        pendingWithdrawals[royaltyRecipient] += royaltyAmount;

        emit SaleCompleted(msg.value, owner, msg.sender);

        _transferOwnership(msg.sender);
    }

    function placeBid() public payable {
        if (msg.value <= currentBid.value) {
            revert InsufficientFunds();
        }

        if (currentBid.value > 0) {
            pendingWithdrawals[currentBid.fromAddress] += currentBid.value;
        }

        currentBid = Bid({ active: true, value: msg.value, fromAddress: msg.sender });

        emit BidPlaced(msg.value, msg.sender);
    }

    function acceptBid() public onlyOwner {
        if (!currentBid.active) {
            revert NoBid();
        }

        uint256 amount = currentBid.value;
        address bidder = currentBid.fromAddress;

        currentOffer = Offer({ active: false, value: 0, toAddress: address(0) });
        currentBid = Bid({ active: false, value: 0, fromAddress: address(0) });

        uint256 royaltyAmount = _calcRoyalty(amount);

        pendingWithdrawals[owner] += amount - royaltyAmount;
        pendingWithdrawals[royaltyRecipient] += royaltyAmount;

        emit BidAccepted(amount, owner, bidder);

        _transferOwnership(bidder);
    }

    function withdrawBid() public {
        if (msg.sender != currentBid.fromAddress) {
            revert NotYourBid();
        }

        uint256 amount = currentBid.value;

        currentBid = Bid({ active: false, value: 0, fromAddress: address(0) });

        _sendFunds(amount);

        emit BidWithdrawn(amount, msg.sender);
    }

    function setRoyaltyRecipient(address newRoyaltyRecipient) public onlyRoyaltyRecipient {
        if (newRoyaltyRecipient == address(0)) {
            revert NullAddress();
        }

        royaltyRecipient = newRoyaltyRecipient;
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = owner;

        owner = newOwner;

        emit ArtpieceTransferred(oldOwner, newOwner);
    }

    function _sendFunds(uint256 amount) internal virtual {
        (bool success, ) = msg.sender.call{value: amount}('');

        if (!success) {
            revert FundsTransfer();
        }
    }

    function _calcRoyalty(uint256 amount) internal virtual returns (uint256) {
        return (amount * royaltyPercentage) / 100;
    }
}