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WvN.DelphiShader.FX.VoxelEdges.pas
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WvN.DelphiShader.FX.VoxelEdges.pas
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unit WvN.DelphiShader.FX.VoxelEdges;
interface
uses GR32, Types, WvN.DelphiShader.Shader;
type
TVoxelEdges = class(TShader)
const
vec3_1:vec3=(x:1;y:113;z:257);
vec2_2:vec2=(x:37;y:17);
vec3_3:vec3=(x:0;y:1;z:0);
vec3_4:vec3=(x:0;y:2;z:0);
vec2_5:vec2=(x:0.1;y:0.9);
vec2_6:vec2=(x:1;y:1.2);
vec2_7:vec2=(x:1;y:4.5);
vec2_8:vec2=(x:1.3;y:1);
vec3_9:vec3=(x:0;y:0;z:0);
vec3_10:vec3=(x:0;y:6;z:0);
vec3_11:vec3=(x:0.1;y:0.3;z:0.4);
vec3_12:vec3=(x:-1;y:0;z:-1);
vec3_13:vec3=(x:1.00;y:0.90;z:0.70);
vec3_14:vec3=(x:0.15;y:0.10;z:0.10);
vec3_15:vec3=(x:0.40;y:0.30;z:0.15);
vec3_16:vec3=(x:5;y:0.6;z:0);
vec3_17:vec3=(x:1;y:2;z:3);
var
gro:vec3;
lig : vec3;
function hash( const x :vec3 ):float;
function noise( const x :vec3 ):float;overload;
function noise( const x :vec2 ):float;overload;
function texcube( const tex:TBitmap32; const p, n :vec3 ):vec4;
function mapTerrain( p :vec3 ):float;
function map( const c:vec3 ):bool;
function castRay( const ro, rd:vec3;out oVos, oDir :vec3 ):float;
function castVRay( const ro, rd:vec3;const maxDist :float ):float;
function edges( const vos, nor, dir :vec3 ):vec4;
function edgesp( const vos, nor, dir :vec3 ):vec4;
function path( t :float ):vec3;
function Main(var gl_FragCoord: Vec2): TColor32;
constructor Create; override;
procedure PrepareFrame;
end;
var
VoxelEdges: TShader;
implementation
uses SysUtils, Math;
constructor TVoxelEdges.Create;
begin
inherited;
FrameProc := PrepareFrame;
PixelProc := Main;
Lig := normalize( vec3.create(-0.4,0.3,0.7) );
end;
procedure TVoxelEdges.PrepareFrame;
begin
gro := vec3Black;
end;
// Created by inigo quilez - iq/2013
// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
function TVoxelEdges.hash( const x :vec3 ):float;
var
n :float;
begin
n := dot( x, vec3_1 );
Exit( fract(sin(n)*43758.5453) );
end;
function TVoxelEdges.noise( const x :vec3 ):float;
var
p :vec3;
f :vec3;
uv :vec2;
rg :vec2;
begin
p := floor(x);
f := fract(x);
f := f*f*(3-2*f);
uv := (p.xy+vec2_2*p.z) + f.xy;
rg := texture2D( tex[0], (uv+ 0.5)/256 ).yx;
Exit( mix( rg.x, rg.y, f.z ) );
end;
function TVoxelEdges.noise( const x :vec2 ):float;
var
p :vec2;
f :vec2;
uv :vec2;
begin
p := floor(x);
f := fract(x);
uv := p.xy + f.xy*f.xy*(3-2*f.xy);
Exit( texture2D( tex[0], (uv+118.4)/256, -100 ).x );
end;
function TVoxelEdges.texcube( const tex:TBitmap32; const p, n :vec3 ):vec4;
var
x :vec4;
y :vec4;
z :vec4;
m :mat3;
begin
x := texture2D( Tex, p.yz );
y := texture2D( Tex, p.zx );
z := texture2D( Tex, p.xy );
Exit( x*abs(n.x) + y*abs(n.y) + z*abs(n.z) );
end;
//===================================
{
m := mat3( 0.00, 0.80, 0.60,
-0.80, 0.36, -0.48,
-0.60, -0.48, 0.64 );
}
function TVoxelEdges.mapTerrain( p :vec3 ):float;
var
time :float;
ft :float;
it :float;
spe :float;
f:float;
begin
p := p * (0.1);
p.xz := p.xz * (0.6);
time := 0.5 + 0.15*iGlobalTime;
ft := fract( time );
it := floor( time );
ft := smoothstep( 0.7, 1, ft );
time := it + ft;
spe := 1.4;
f := 0.5000*noise( p*1.00 + vec3_3*spe*time );
f := f + (0.2500*noise( p*2.02 + vec3_4*spe*time ));
f := f + (0.1250*noise( p*4.01 ));
Exit( 25*f-10 );
end;
function TVoxelEdges.map( const c:vec3 ):bool;
var
p :vec3;
f :float;
begin
p := c + 0.5;
f := mapTerrain( p ) + 0.25*p.y;
f := mix( f, 1, step( length(vec3Black-p), 5 ) );
Exit( f < 0.5 );
end;
function TVoxelEdges.castRay( const ro, rd:vec3;out oVos, oDir :vec3 ):float;
var
pos :vec3;
ri :vec3;
rs :vec3;
dis :vec3;
res :float;
mm :vec3;
i:integer; // loop variable
nor :vec3;
vos :vec3;
mini :vec3;
t :float;
begin
pos := floor(ro);
ri := 1/rd;
rs.x := Math.sign(rd.x);
rs.y := Math.sign(rd.y);
rs.z := Math.sign(rd.z);
dis := (pos-ro + 0.5 + rs*0.5) * ri;
res := -1;
mm := vec3(0);
for i := 0 to 127 do
begin
if map(pos) then
begin
res:=1;
continue;
end;
mm := step(dis.xyz, dis.yxy) * step(dis.xyz, dis.zzx);
dis := dis + (mm * rs * ri);
pos := pos + (mm * rs);
end;
nor := -mm*rs;
vos := pos;
// intersect the cube
mini := (pos-ro + 0.5 - 0.5*vec3(rs))*ri;
t := Math.max ( mini.x, Math.max ( mini.y, mini.z ) );
oDir := mm;
oVos := vos;
Exit( t*res );
end;
function TVoxelEdges.castVRay( const ro, rd:vec3;const maxDist :float ):float;
var
pos :vec3;
ri :vec3;
rs :vec3;
dis :vec3;
res :float;
i:integer; // loop variable
mm :vec3;
begin
pos := floor(ro);
ri := 1/rd;
rs.x := Math.sign(rd.x);
rs.y := Math.sign(rd.y);
rs.z := Math.sign(rd.z);
dis := (pos-ro + 0.5 + rs*0.5) * ri;
res := 1;
for i := 0 to 49 do
begin
if map(pos) then
begin
res := 0;
continue;
end;
mm := step(dis.xyz, dis.yxy) * step(dis.xyz, dis.zzx);
dis := dis + (mm * rs * ri);
pos := pos + (mm * rs);
end;
Exit( res );
end;
function TVoxelEdges.edges( const vos, nor, dir :vec3 ):vec4;
var
v1 :vec3;
v2 :vec3;
v3 :vec3;
v4 :vec3;
res :vec4;
begin
v1 := vos + nor + dir.yzx;
v2 := vos + nor - dir.yzx;
v3 := vos + nor + dir.zxy;
v4 := vos + nor - dir.zxy;
res := vec4Black;
if map(v1) then res.x := 1;
if map(v2) then res.y := 1;
if map(v3) then res.z := 1;
if map(v4) then res.w := 1;
Exit( res );
end;
function TVoxelEdges.edgesp( const vos, nor, dir :vec3 ):vec4;
var
v1 :vec3;
v2 :vec3;
v3 :vec3;
v4 :vec3;
res :vec4;
begin
v1 := vos + dir.yzx;
v2 := vos - dir.yzx;
v3 := vos + dir.zxy;
v4 := vos - dir.zxy;
res := vec4Black;
if map(v1) then res.x := 1;
if map(v2) then res.y := 1;
if map(v3) then res.z := 1;
if map(v4) then res.w := 1;
Exit( res );
end;
function TVoxelEdges.path( t :float ):vec3;
var
p :vec2;
begin
p := 100*sin( 0.02*t*vec2_6 + vec2_5 );
p := p + (50*sin( 0.04*t*vec2_8 + vec2_7 ));
Exit( Vec3.Create( p.x,18 + 4*sin(0.05*t),p.y ) );
end;
function TVoxelEdges.Main(var gl_FragCoord: Vec2): TColor32;
var
q :vec2;
p :vec2;
mo :vec2;
time :float;
ro :vec3;
ta :vec3;
cr :float;
ww :vec3;
uu :vec3;
vv :vec3;
r2 :float;
rd :vec3;
col :vec3;
vos, dir:vec3;
t :float;
nor :vec3;
pos :vec3;
ed :vec4;
ep :vec4;
uvw :vec3;
wir :vec3;
www :float;
vvv :float;
dif :float;
sha:float;
bac :float;
sky :float;
amb :float;
occ :float;
v1,v2,v3,v4 :vec3;
ff:float;
lin :vec3;
lineglow :float;
linCol :vec3;
c:vec3;
begin
// inputs
q := gl_FragCoord.xy / resolution.xy;
p := -1 + 2*q;
p.x := p.x * (resolution.x/ resolution.y);
mo := iMouse.xy / resolution.xy;
if iMouse.w<=0.00001 then mo := vec2Black;
sha:=0;
time := 2*iGlobalTime + 50*mo.x;
// camera
ro := 20.5*normalize(Vec3.Create(cos(time),0.5,sin(time)));
ta := vec3_9;
cr := 0.2*cos(0.1*iGlobalTime);
ro := path( time );
ta := path( time+5 ) - vec3_10;
gro := ro;
// build ray
ww := normalize( ta - ro);
uu := normalize(cross( Vec3.Create(sin(cr),cos(cr),0),ww ));
vv := normalize(cross(ww,uu));
r2 := p.x*p.x*0.32 + p.y*p.y;
p := p * ((7-system.sqrt(37.5-11.5*r2))/(r2+1));
rd := normalize( p.x*uu + p.y*vv + 2.5*ww );
col := vec3(0);
t := castRay( ro, rd, vos, dir );
if t>0 then
begin
nor.x := -dir.x*Math.sign(rd.x);
nor.y := -dir.y*Math.sign(rd.y);
nor.z := -dir.z*Math.sign(rd.z);
pos := ro + rd*t;
ed := edges( vos, nor, dir );
ep := edgesp( vos, nor, dir );
// wireframe
uvw := pos - vos;
wir := smoothstep( 0.4, 0.48, abs(uvw-0.5) );
www := 0;
{$if true}
www := (1-wir.x*wir.y)*(1-wir.x*wir.z)*(1-wir.y*wir.z);
{$else}
www := 1;
www := www * (1 -smoothstep( 0.85, 0.99, dot(uvw,dir.yzx) )*(1-ep.x*(1-ed.x)));
www := www * (1 -smoothstep( 0.85, 0.99, 1-dot(uvw,dir.yzx) )*(1-ep.y*(1-ed.y)));
www := www * (1 -smoothstep( 0.85, 0.99, dot(uvw,dir.zxy) )*(1-ep.z*(1-ed.z)));
www := www * (1 -smoothstep( 0.85, 0.99, 1-dot(uvw,dir.zxy) )*(1-ep.w*(1-ed.w)));
{$endif }
wir := smoothstep( 0.4, 0.5, abs(uvw-0.5) );
vvv := (1-wir.x*wir.y)*(1-wir.x*wir.z)*(1-wir.y*wir.z);
col := 2*texture2D( tex[1],0.01*pos.xz ).zyx;
col := col + (0.8*vec3_11);
col := col * (0.5 + 0.5*texcube(Tex[2] , 0.5*pos, nor ).x);
col := col * (1 - 0.75*(1-vvv)*www);
// lighting
dif := clamp( dot( nor, lig ), 0, 1 );
if dif>0.01 then sha := castVRay(pos+nor*0.01,lig,32);
bac := clamp( dot( nor, normalize(lig*vec3_12) ), 0, 1 );
sky := 0.5 + 0.5*nor.y;
amb := clamp(0.75 + pos.y/25,0,1);
occ := 1;
v1 := vos + nor + dir.yzx;
v2 := vos + nor - dir.yzx;
v3 := vos + nor + dir.zxy;
v4 := vos + nor - dir.zxy;
occ := 0;
ff := mix( 1, pow(1-dot(uvw,dir.yzx),1), ed.x); ff := mix( 1, pow(1-dot(uvw,dir.yzx),1), ed.x); occ := ff; occ := occ + ((0.98/4)*ff);
ff := mix( 1, pow( dot(uvw,dir.yzx),1), ed.y); ff := mix( 1, pow( dot(uvw,dir.yzx),1), ed.y); occ := ff; occ := occ + ((0.98/4)*ff);
ff := mix( 1, pow(1-dot(uvw,dir.zxy),1), ed.z); ff := mix( 1, pow(1-dot(uvw,dir.zxy),1), ed.z); occ := ff; occ := occ + ((0.98/4)*ff);
ff := mix( 1, pow( dot(uvw,dir.zxy),1), ed.w); ff := mix( 1, pow( dot(uvw,dir.zxy),1), ed.w); occ := ff; occ := occ + ((0.98/4)*ff);
occ := pow(occ,3);
occ := occ * (amb);
lin := vec3Black;
lin := lin + (6*dif*vec3_13*sha*(0.5+0.5*occ));
lin := lin + (0.5*bac*vec3_14*occ);
lin := lin + (2*sky*vec3_15*occ);
//lin := vec3(occ)*2.0;
//lin = vec3(1.0)*occ*12.0;
// line glow
lineglow := 0;
lineglow := lineglow + (smoothstep( 0.4, 1, dot(uvw,dir.yzx) )*(1-ep.x*(1-ed.x)));
lineglow := lineglow + (smoothstep( 0.4, 1, 1-dot(uvw,dir.yzx) )*(1-ep.y*(1-ed.y)));
lineglow := lineglow + (smoothstep( 0.4, 1, dot(uvw,dir.zxy) )*(1-ep.z*(1-ed.z)));
lineglow := lineglow + (smoothstep( 0.4, 1, 1-dot(uvw,dir.zxy) )*(1-ep.w*(1-ed.w)));
linCol := 2*vec3_16;
linCol := linCol * ((0.5+0.5*occ)*(0.25+sha));
lin := lin + (3*lineglow*linCol);
col := col*lin;
col := col + (8*linCol*vec3_17*(1-www));
col := col + (0.1*lineglow*linCol);
col := col * (min(0.1,exp( -0.07*t )));
function TVoxelEdges.col2:vec3;
begin
Result := vec3(1.3)*(0.5+0.5*nor.y)*occ*www*(0.9+0.1*vvv)*exp:vec3;
end;
function TVoxelEdges.mi:vec3;
= sin:float;;
mi := smoothstep( 0.90, 0.95, mi );
col := mix( col, col2, mi );
end;
// gamma
col := pow( col, vec3(0.45) );
col := clamp( col, 0, 1 );
// vignetting
col := col * (0.5 + 0.5*pow( 16*q.x*q.y*(1-q.x)*(1-q.y), 0.1 ));
Result := vec4( col, 1 );
initialization
VoxelEdges := TVoxelEdges.Create;
Shaders.Add('VoxelEdges', VoxelEdges);
finalization
FreeandNil(VoxelEdges);
end.