v/examples/sokol/rt_glsl/rt_glsl.glsl

//------------------------------------------------------------------------------
//  Shader code for texcube-sapp sample.
//
//  NOTE: This source file also uses the '#pragma sokol' form of the
//  custom tags.
//------------------------------------------------------------------------------
#pragma sokol @ctype mat4 hmm_mat4

#pragma sokol @vs vs
uniform vs_params {
    mat4 mvp;
};

in vec4 pos;
in vec4 color0;
in vec2 texcoord0;

out vec4 color;
out vec2 uv;

void main() {
    gl_Position = mvp * pos;
    color = color0;
    uv = texcoord0;
}
#pragma sokol @end

#pragma sokol @fs fs
uniform sampler2D tex;
uniform fs_params {
	vec2 iResolution;
	vec2 iMouse;
	float iTime;
	float iFrame;
};

in vec4 color;
in vec2 uv;
out vec4 frag_color;

// change to 0 to 4 to increment the AntiAliasing, 
// increase AA will SLOW the rendering!!
#define AA 1

//*********************************************************
// Ray Marching
// original code from: https://www.shadertoy.com/view/Xds3zN
//*********************************************************
// The MIT License
// Copyright © 2013 Inigo Quilez
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

// A list of useful distance function to simple primitives. All
// these functions (except for ellipsoid) return an exact
// euclidean distance, meaning they produce a better SDF than
// what you'd get if you were constructing them from boolean
// operations.
//
// More info here:
//
// https://www.iquilezles.org/www/articles/distfunctions/distfunctions.htm

//------------------------------------------------------------------
float dot2( in vec2 v ) { return dot(v,v); }
float dot2( in vec3 v ) { return dot(v,v); }
float ndot( in vec2 a, in vec2 b ) { return a.x*b.x - a.y*b.y; }

float sdPlane( vec3 p )
{
	return p.y;
}

float sdSphere( vec3 p, float s )
{
	return length(p)-s;
}

float sdBox( vec3 p, vec3 b )
{
	vec3 d = abs(p) - b;
	return min(max(d.x,max(d.y,d.z)),0.0) + length(max(d,0.0));
}

float sdBoundingBox( vec3 p, vec3 b, float e )
{
	p = abs(p  )-b;
	vec3 q = abs(p+e)-e;

	return min(min(
		length(max(vec3(p.x,q.y,q.z),0.0))+min(max(p.x,max(q.y,q.z)),0.0),
		length(max(vec3(q.x,p.y,q.z),0.0))+min(max(q.x,max(p.y,q.z)),0.0)),
		length(max(vec3(q.x,q.y,p.z),0.0))+min(max(q.x,max(q.y,p.z)),0.0));
}
float sdEllipsoid( in vec3 p, in vec3 r ) // approximated
{
	float k0 = length(p/r);
	float k1 = length(p/(r*r));
	return k0*(k0-1.0)/k1;
}

float sdTorus( vec3 p, vec2 t )
{
	return length( vec2(length(p.xz)-t.x,p.y) )-t.y;
}

float sdCappedTorus(in vec3 p, in vec2 sc, in float ra, in float rb)
{
	p.x = abs(p.x);
	float k = (sc.y*p.x>sc.x*p.y) ? dot(p.xy,sc) : length(p.xy);
	return sqrt( dot(p,p) + ra*ra - 2.0*ra*k ) - rb;
}

float sdHexPrism( vec3 p, vec2 h )
{
	vec3 q = abs(p);

	const vec3 k = vec3(-0.8660254, 0.5, 0.57735);
	p = abs(p);
	p.xy -= 2.0*min(dot(k.xy, p.xy), 0.0)*k.xy;
	vec2 d = vec2(
		length(p.xy - vec2(clamp(p.x, -k.z*h.x, k.z*h.x), h.x))*sign(p.y - h.x),
		p.z-h.y );
	return min(max(d.x,d.y),0.0) + length(max(d,0.0));
}

float sdOctogonPrism( in vec3 p, in float r, float h )
{
	const vec3 k = vec3(-0.9238795325,   // sqrt(2+sqrt(2))/2 
											 0.3826834323,   // sqrt(2-sqrt(2))/2
											 0.4142135623 ); // sqrt(2)-1 
	// reflections
	p = abs(p);
	p.xy -= 2.0*min(dot(vec2( k.x,k.y),p.xy),0.0)*vec2( k.x,k.y);
	p.xy -= 2.0*min(dot(vec2(-k.x,k.y),p.xy),0.0)*vec2(-k.x,k.y);
	// polygon side
	p.xy -= vec2(clamp(p.x, -k.z*r, k.z*r), r);
	vec2 d = vec2( length(p.xy)*sign(p.y), p.z-h );
	return min(max(d.x,d.y),0.0) + length(max(d,0.0));
}

float sdCapsule( vec3 p, vec3 a, vec3 b, float r )
{
	vec3 pa = p-a, ba = b-a;
	float h = clamp( dot(pa,ba)/dot(ba,ba), 0.0, 1.0 );
	return length( pa - ba*h ) - r;
}

float sdRoundCone( in vec3 p, in float r1, float r2, float h )
{
	vec2 q = vec2( length(p.xz), p.y );

	float b = (r1-r2)/h;
	float a = sqrt(1.0-b*b);
	float k = dot(q,vec2(-b,a));

	if( k < 0.0 ) return length(q) - r1;
	if( k > a*h ) return length(q-vec2(0.0,h)) - r2;
			
	return dot(q, vec2(a,b) ) - r1;
}

float sdRoundCone(vec3 p, vec3 a, vec3 b, float r1, float r2)
{
	// sampling independent computations (only depend on shape)
	vec3  ba = b - a;
	float l2 = dot(ba,ba);
	float rr = r1 - r2;
	float a2 = l2 - rr*rr;
	float il2 = 1.0/l2;

	// sampling dependant computations
	vec3 pa = p - a;
	float y = dot(pa,ba);
	float z = y - l2;
	float x2 = dot2( pa*l2 - ba*y );
	float y2 = y*y*l2;
	float z2 = z*z*l2;

	// single square root!
	float k = sign(rr)*rr*rr*x2;
	if( sign(z)*a2*z2 > k ) return  sqrt(x2 + z2)        *il2 - r2;
	if( sign(y)*a2*y2 < k ) return  sqrt(x2 + y2)        *il2 - r1;
													return (sqrt(x2*a2*il2)+y*rr)*il2 - r1;
}

float sdTriPrism( vec3 p, vec2 h )
{
	const float k = sqrt(3.0);
	h.x *= 0.5*k;
	p.xy /= h.x;
	p.x = abs(p.x) - 1.0;
	p.y = p.y + 1.0/k;
	if( p.x+k*p.y>0.0 ) p.xy=vec2(p.x-k*p.y,-k*p.x-p.y)/2.0;
	p.x -= clamp( p.x, -2.0, 0.0 );
	float d1 = length(p.xy)*sign(-p.y)*h.x;
	float d2 = abs(p.z)-h.y;
	return length(max(vec2(d1,d2),0.0)) + min(max(d1,d2), 0.);
}

// vertical
float sdCylinder( vec3 p, vec2 h )
{
	vec2 d = abs(vec2(length(p.xz),p.y)) - h;
	return min(max(d.x,d.y),0.0) + length(max(d,0.0));
}

// arbitrary orientation
float sdCylinder(vec3 p, vec3 a, vec3 b, float r)
{
	vec3 pa = p - a;
	vec3 ba = b - a;
	float baba = dot(ba,ba);
	float paba = dot(pa,ba);

	float x = length(pa*baba-ba*paba) - r*baba;
	float y = abs(paba-baba*0.5)-baba*0.5;
	float x2 = x*x;
	float y2 = y*y*baba;
	float d = (max(x,y)<0.0)?-min(x2,y2):(((x>0.0)?x2:0.0)+((y>0.0)?y2:0.0));
	return sign(d)*sqrt(abs(d))/baba;
}

// vertical
float sdCone( in vec3 p, in vec2 c, float h )
{
	vec2 q = h*vec2(c.x,-c.y)/c.y;
	vec2 w = vec2( length(p.xz), p.y );

	vec2 a = w - q*clamp( dot(w,q)/dot(q,q), 0.0, 1.0 );
	vec2 b = w - q*vec2( clamp( w.x/q.x, 0.0, 1.0 ), 1.0 );
	float k = sign( q.y );
	float d = min(dot( a, a ),dot(b, b));
	float s = max( k*(w.x*q.y-w.y*q.x),k*(w.y-q.y)  );
	return sqrt(d)*sign(s);
}

float sdCappedCone( in vec3 p, in float h, in float r1, in float r2 )
{
	vec2 q = vec2( length(p.xz), p.y );

	vec2 k1 = vec2(r2,h);
	vec2 k2 = vec2(r2-r1,2.0*h);
	vec2 ca = vec2(q.x-min(q.x,(q.y < 0.0)?r1:r2), abs(q.y)-h);
	vec2 cb = q - k1 + k2*clamp( dot(k1-q,k2)/dot2(k2), 0.0, 1.0 );
	float s = (cb.x < 0.0 && ca.y < 0.0) ? -1.0 : 1.0;
	return s*sqrt( min(dot2(ca),dot2(cb)) );
}

float sdCappedCone(vec3 p, vec3 a, vec3 b, float ra, float rb)
{
	float rba  = rb-ra;
	float baba = dot(b-a,b-a);
	float papa = dot(p-a,p-a);
	float paba = dot(p-a,b-a)/baba;

	float x = sqrt( papa - paba*paba*baba );

	float cax = max(0.0,x-((paba<0.5)?ra:rb));
	float cay = abs(paba-0.5)-0.5;

	float k = rba*rba + baba;
	float f = clamp( (rba*(x-ra)+paba*baba)/k, 0.0, 1.0 );

	float cbx = x-ra - f*rba;
	float cby = paba - f;

	float s = (cbx < 0.0 && cay < 0.0) ? -1.0 : 1.0;

	return s*sqrt( min(cax*cax + cay*cay*baba,
								cbx*cbx + cby*cby*baba) );
}

// c is the sin/cos of the desired cone angle
float sdSolidAngle(vec3 pos, vec2 c, float ra)
{
	vec2 p = vec2( length(pos.xz), pos.y );
	float l = length(p) - ra;
	float m = length(p - c*clamp(dot(p,c),0.0,ra) );
	return max(l,m*sign(c.y*p.x-c.x*p.y));
}

float sdOctahedron(vec3 p, float s)
{
	p = abs(p);
	float m = p.x + p.y + p.z - s;

// exact distance
#if 0
	vec3 o = min(3.0*p - m, 0.0);
	o = max(6.0*p - m*2.0 - o*3.0 + (o.x+o.y+o.z), 0.0);
	return length(p - s*o/(o.x+o.y+o.z));
#endif

// exact distance
#if 1
	vec3 q;
			 if( 3.0*p.x < m ) q = p.xyz;
	else if( 3.0*p.y < m ) q = p.yzx;
	else if( 3.0*p.z < m ) q = p.zxy;
	else return m*0.57735027;
	float k = clamp(0.5*(q.z-q.y+s),0.0,s); 
	return length(vec3(q.x,q.y-s+k,q.z-k)); 
#endif

// bound, not exact
#if 0
	return m*0.57735027;
#endif
}

float sdPyramid( in vec3 p, in float h )
{
	float m2 = h*h + 0.25;

	// symmetry
	p.xz = abs(p.xz);
	p.xz = (p.z>p.x) ? p.zx : p.xz;
	p.xz -= 0.5;

	// project into face plane (2D)
	vec3 q = vec3( p.z, h*p.y - 0.5*p.x, h*p.x + 0.5*p.y);

	float s = max(-q.x,0.0);
	float t = clamp( (q.y-0.5*p.z)/(m2+0.25), 0.0, 1.0 );

	float a = m2*(q.x+s)*(q.x+s) + q.y*q.y;
	float b = m2*(q.x+0.5*t)*(q.x+0.5*t) + (q.y-m2*t)*(q.y-m2*t);

	float d2 = min(q.y,-q.x*m2-q.y*0.5) > 0.0 ? 0.0 : min(a,b);

	// recover 3D and scale, and add sign
	return sqrt( (d2+q.z*q.z)/m2 ) * sign(max(q.z,-p.y));
}

// la,lb=semi axis, h=height, ra=corner
float sdRhombus(vec3 p, float la, float lb, float h, float ra)
{
	p = abs(p);
	vec2 b = vec2(la,lb);
	float f = clamp( (ndot(b,b-2.0*p.xz))/dot(b,b), -1.0, 1.0 );
	vec2 q = vec2(length(p.xz-0.5*b*vec2(1.0-f,1.0+f))*sign(p.x*b.y+p.z*b.x-b.x*b.y)-ra, p.y-h);
	return min(max(q.x,q.y),0.0) + length(max(q,0.0));
}

//------------------------------------------------------------------

vec2 opU( vec2 d1, vec2 d2 )
{
	return (d1.x<d2.x) ? d1 : d2;
}

//------------------------------------------------------------------

#define ZERO (min(int(iFrame),0))

//------------------------------------------------------------------

vec2 map( in vec3 pos )
{
	vec2 res = vec2( 1e10, 0.0 );

	{
		res = opU( res, vec2( sdSphere(    pos-vec3(-2.0,0.25, 0.0), 0.25 ), 26.9 ) );
	}

	// bounding box
	if( sdBox( pos-vec3(0.0,0.3,-1.0),vec3(0.35,0.3,2.5) )<res.x )
	{
		// more primitives
		res = opU( res, vec2( sdBoundingBox( pos-vec3( 0.0,0.25, 0.0), vec3(0.3,0.25,0.2), 0.025 ), 16.9 ) );
		res = opU( res, vec2( sdTorus(      (pos-vec3( 0.0,0.30, 1.0)).xzy, vec2(0.25,0.05) ), 25.0 ) );
		res = opU( res, vec2( sdCone(        pos-vec3( 0.0,0.45,-1.0), vec2(0.6,0.8),0.45 ), 55.0 ) );
		res = opU( res, vec2( sdCappedCone(  pos-vec3( 0.0,0.25,-2.0), 0.25, 0.25, 0.1 ), 13.67 ) );
		res = opU( res, vec2( sdSolidAngle(  pos-vec3( 0.0,0.00,-3.0), vec2(3,4)/5.0, 0.4 ), 49.13 ) );
	}

	// bounding box
	if( sdBox( pos-vec3(1.0,0.3,-1.0),vec3(0.35,0.3,2.5) )<res.x )
	{
		// more primitives
		res = opU( res, vec2( sdCappedTorus((pos-vec3( 1.0,0.30, 1.0))*vec3(1,-1,1), vec2(0.866025,-0.5), 0.25, 0.05), 8.5) );
		res = opU( res, vec2( sdBox(         pos-vec3( 1.0,0.25, 0.0), vec3(0.3,0.25,0.1) ), 3.0 ) );
		res = opU( res, vec2( sdCapsule(     pos-vec3( 1.0,0.00,-1.0),vec3(-0.1,0.1,-0.1), vec3(0.2,0.4,0.2), 0.1  ), 31.9 ) );
		res = opU( res, vec2( sdCylinder(    pos-vec3( 1.0,0.25,-2.0), vec2(0.15,0.25) ), 8.0 ) );
		res = opU( res, vec2( sdHexPrism(    pos-vec3( 1.0,0.2,-3.0), vec2(0.2,0.05) ), 18.4 ) );
	}

	// bounding box
	if( sdBox( pos-vec3(-1.0,0.35,-1.0),vec3(0.35,0.35,2.5))<res.x )
	{
		// more primitives
		res = opU( res, vec2( sdPyramid(    pos-vec3(-1.0,-0.6,-3.0), 1.0 ), 13.56 ) );
		res = opU( res, vec2( sdOctahedron( pos-vec3(-1.0,0.15,-2.0), 0.35 ), 23.56 ) );
		res = opU( res, vec2( sdTriPrism(   pos-vec3(-1.0,0.15,-1.0), vec2(0.3,0.05) ),43.5 ) );
		res = opU( res, vec2( sdEllipsoid(  pos-vec3(-1.0,0.25, 0.0), vec3(0.2, 0.25, 0.05) ), 43.17 ) );
		res = opU( res, vec2( sdRhombus(   (pos-vec3(-1.0,0.34, 1.0)).xzy, 0.15, 0.25, 0.04, 0.08 ),17.0 ) );
	}

	// bounding box
	if( sdBox( pos-vec3(2.0,0.3,-1.0),vec3(0.35,0.3,2.5) )<res.x )
	{
		// more primitives
		res = opU( res, vec2( sdOctogonPrism(pos-vec3( 2.0,0.2,-3.0), 0.2, 0.05), 51.8 ) );
		res = opU( res, vec2( sdCylinder(    pos-vec3( 2.0,0.15,-2.0), vec3(0.1,-0.1,0.0), vec3(-0.2,0.35,0.1), 0.08), 31.2 ) );
		res = opU( res, vec2( sdCappedCone(  pos-vec3( 2.0,0.10,-1.0), vec3(0.1,0.0,0.0), vec3(-0.2,0.40,0.1), 0.15, 0.05), 46.1 ) );
		res = opU( res, vec2( sdRoundCone(   pos-vec3( 2.0,0.15, 0.0), vec3(0.1,0.0,0.0), vec3(-0.1,0.35,0.1), 0.15, 0.05), 51.7 ) );
		res = opU( res, vec2( sdRoundCone(   pos-vec3( 2.0,0.20, 1.0), 0.2, 0.1, 0.3 ), 37.0 ) );
	}
    
	return res;
}

// http://iquilezles.org/www/articles/boxfunctions/boxfunctions.htm
vec2 iBox( in vec3 ro, in vec3 rd, in vec3 rad ) 
{
	vec3 m = 1.0/rd;
	vec3 n = m*ro;
	vec3 k = abs(m)*rad;
	vec3 t1 = -n - k;
	vec3 t2 = -n + k;
	return vec2( max( max( t1.x, t1.y ), t1.z ),
							min( min( t2.x, t2.y ), t2.z ) );
}

vec2 raycast( in vec3 ro, in vec3 rd )
{
	vec2 res = vec2(-1.0,-1.0);

	float tmin = 1.0;
	float tmax = 20.0;

	// raytrace floor plane
	float tp1 = (0.0-ro.y)/rd.y;
	if( tp1>0.0 )
	{
		tmax = min( tmax, tp1 );
		res = vec2( tp1, 1.0 );
	}
	//else return res;
    
	// raymarch primitives   
	vec2 tb = iBox( ro-vec3(0.0,0.4,-0.5), rd, vec3(2.5,0.41,3.0) );
	if( tb.x<tb.y && tb.y>0.0 && tb.x<tmax)
	{
		//return vec2(tb.x,2.0);
		tmin = max(tb.x,tmin);
		tmax = min(tb.y,tmax);

		float t = tmin;
		for( int i=0; i<70 && t<tmax; i++ )
		{
			vec2 h = map( ro+rd*t );
			if( abs(h.x)<(0.0001*t) )
			{ 
				res = vec2(t,h.y); 
				break;
			}
			t += h.x;
		}
	}

	return res;
}

// http://iquilezles.org/www/articles/rmshadows/rmshadows.htm
float calcSoftshadow( in vec3 ro, in vec3 rd, in float mint, in float tmax )
{
	// bounding volume
	float tp = (0.8-ro.y)/rd.y; if( tp>0.0 ) tmax = min( tmax, tp );

	float res = 1.0;
	float t = mint;
	for( int i=ZERO; i<24; i++ )
	{
	float h = map( ro + rd*t ).x;
		float s = clamp(8.0*h/t,0.0,1.0);
		res = min( res, s*s*(3.0-2.0*s) );
		t += clamp( h, 0.02, 0.2 );
		if( res<0.004 || t>tmax ) break;
	}
	return clamp( res, 0.0, 1.0 );
}

// http://iquilezles.org/www/articles/normalsSDF/normalsSDF.htm
vec3 calcNormal( in vec3 pos )
{
#if 0
	vec2 e = vec2(1.0,-1.0)*0.5773*0.0005;
	return normalize( e.xyy*map( pos + e.xyy ).x + 
		e.yyx*map( pos + e.yyx ).x + 
		e.yxy*map( pos + e.yxy ).x + 
		e.xxx*map( pos + e.xxx ).x );
#else
	// inspired by tdhooper and klems - a way to prevent the compiler from inlining map() 4 times
	vec3 n = vec3(0.0);
	for( int i=ZERO; i<4; i++ )
	{
		vec3 e = 0.5773*(2.0*vec3((((i+3)>>1)&1),((i>>1)&1),(i&1))-1.0);
		n += e*map(pos+0.0005*e).x;
		//if( n.x+n.y+n.z>100.0 ) break;
	}
	return normalize(n);
#endif    
}

float calcAO( in vec3 pos, in vec3 nor )
{
	float occ = 0.0;
	float sca = 1.0;
	for( int i=ZERO; i<5; i++ )
	{
		float h = 0.01 + 0.12*float(i)/4.0;
		float d = map( pos + h*nor ).x;
		occ += (h-d)*sca;
		sca *= 0.95;
		if( occ>0.35 ) break;
	}
	return clamp( 1.0 - 3.0*occ, 0.0, 1.0 ) * (0.5+0.5*nor.y);
}

// http://iquilezles.org/www/articles/checkerfiltering/checkerfiltering.htm
float checkersGradBox( in vec2 p, in vec2 dpdx, in vec2 dpdy )
{
	// filter kernel
	vec2 w = abs(dpdx)+abs(dpdy) + 0.001;
	// analytical integral (box filter)
	vec2 i = 2.0*(abs(fract((p-0.5*w)*0.5)-0.5)-abs(fract((p+0.5*w)*0.5)-0.5))/w;
	// xor pattern
	return 0.5 - 0.5*i.x*i.y;                  
}

vec3 render( in vec3 ro, in vec3 rd, in vec3 rdx, in vec3 rdy )
{ 
	// background
	vec3 col = vec3(0.7, 0.7, 0.9) - max(rd.y,0.0)*0.3;

	// raycast scene
	vec2 res = raycast(ro,rd);
	float t = res.x;
	float m = res.y;
	if( m>-0.5 )
	{
		vec3 pos = ro + t*rd;
		vec3 nor = (m<1.5) ? vec3(0.0,1.0,0.0) : calcNormal( pos );
		vec3 ref = reflect( rd, nor );
        
		// material        
		col = 0.2 + 0.2*sin( m*2.0 + vec3(0.0,1.0,2.0) );
		float ks = 1.0;
        
		if( m<1.5 )
		{
			// project pixel footprint into the plane
			vec3 dpdx = ro.y*(rd/rd.y-rdx/rdx.y);
			vec3 dpdy = ro.y*(rd/rd.y-rdy/rdy.y);

			float f = checkersGradBox( 3.0*pos.xz, 3.0*dpdx.xz, 3.0*dpdy.xz );
			col = 0.15 + f*vec3(0.05);
			ks = 0.4;
		}

		// lighting
		float occ = calcAO( pos, nor );
		
		vec3 lin = vec3(0.0);

		// sun
		{
			vec3  lig = normalize( vec3(-0.5, 0.4, -0.6) );
			vec3  hal = normalize( lig-rd );
			float dif = clamp( dot( nor, lig ), 0.0, 1.0 );
			//if( dif>0.0001 )
				dif *= calcSoftshadow( pos, lig, 0.02, 2.5 );
			float spe = pow( clamp( dot( nor, hal ), 0.0, 1.0 ),16.0);
						spe *= dif;
						spe *= 0.04+0.96*pow(clamp(1.0-dot(hal,lig),0.0,1.0),5.0);
			lin += col*2.20*dif*vec3(1.30,1.00,0.70);
			lin +=     5.00*spe*vec3(1.30,1.00,0.70)*ks;
		}
		// sky
		{
			float dif = sqrt(clamp( 0.5+0.5*nor.y, 0.0, 1.0 ));
						dif *= occ;
			float spe = smoothstep( -0.2, 0.2, ref.y );
						spe *= dif;
						spe *= 0.04+0.96*pow(clamp(1.0+dot(nor,rd),0.0,1.0), 5.0 );
			//if( spe>0.001 )
						spe *= calcSoftshadow( pos, ref, 0.02, 2.5 );
			lin += col*0.60*dif*vec3(0.40,0.60,1.15);
			lin +=     2.00*spe*vec3(0.40,0.60,1.30)*ks;
		}
		// back
		{
			float dif = clamp( dot( nor, normalize(vec3(0.5,0.0,0.6))), 0.0, 1.0 )*clamp( 1.0-pos.y,0.0,1.0);
							dif *= occ;
			lin += col*0.55*dif*vec3(0.25,0.25,0.25);
		}
		// sss
		{
			float dif = pow(clamp(1.0+dot(nor,rd),0.0,1.0),2.0);
						dif *= occ;
			lin += col*0.25*dif*vec3(1.00,1.00,1.00);
		}
        
		col = lin;

		col = mix( col, vec3(0.7,0.7,0.9), 1.0-exp( -0.0001*t*t*t ) );
	}

	return vec3( clamp(col,0.0,1.0) );
}

mat3 setCamera( in vec3 ro, in vec3 ta, float cr )
{
	vec3 cw = normalize(ta-ro);
	vec3 cp = vec3(sin(cr), cos(cr),0.0);
	vec3 cu = normalize( cross(cw,cp) );
	vec3 cv =          ( cross(cu,cw) );
	return mat3( cu, cv, cw );
}

vec4 mainImage( vec2 fragCoord )
{
	vec2 mo = iMouse.xy/iResolution.xy;
	float time = 32.0 + iTime*1.5;

	// camera	
	vec3 ta = vec3( 0.5, -0.5, -0.6 );
	vec3 ro = ta + vec3( 4.5*cos(0.1*time + 7.0*mo.x), 1.3 + 2.0*mo.y, 4.5*sin(0.1*time + 7.0*mo.x) );
	// camera-to-world transformation
	mat3 ca = setCamera( ro, ta, 0.0 );

	vec3 tot = vec3(0.0);
#if AA>1
	for( int m=ZERO; m<AA; m++ )
	for( int n=ZERO; n<AA; n++ )
	{
		// pixel coordinates
		vec2 o = vec2(float(m),float(n)) / float(AA) - 0.5;
		vec2 p = (2.0*(fragCoord+o)-iResolution.xy)/iResolution.y;
#else    
		vec2 p = (2.0*fragCoord-iResolution.xy)/iResolution.y;
#endif

		// focal length
		const float fl = 2.5;
		
		// ray direction
		vec3 rd = ca * normalize( vec3(p,fl) );

		 // ray differentials
		vec2 px = (2.0*(fragCoord+vec2(1.0,0.0))-iResolution.xy)/iResolution.y;
		vec2 py = (2.0*(fragCoord+vec2(0.0,1.0))-iResolution.xy)/iResolution.y;
		vec3 rdx = ca * normalize( vec3(px,fl) );
		vec3 rdy = ca * normalize( vec3(py,fl) );
		
		// render	
		vec3 col = render( ro, rd, rdx, rdy );

		// gain
		// col = col*3.0/(2.5+col);
        
		// gamma
		col = pow( col, vec3(0.4545) );

		tot += col;
#if AA>1
	}
	tot /= float(AA*AA);
#endif
    
	//fragColor = vec4( tot, 1.0 );
	return vec4( tot, 1.0 );
}

//*********************************************************
// END Ray Marching
//*********************************************************

void main() {
	vec4 c = color;
	vec4 txt = texture(tex, uv);
	c = txt * c;
	vec2 uv1 = uv * iResolution;
	vec4 col_ray = mainImage(uv1);
	
	// use this to mix the chessboart texture with the ray marching
	//frag_color = clamp(c*iMouse.y/512.0,0.0,1.0) *	col_ray	;
	
	frag_color = c*0.00001 +	col_ray	;
}

#pragma sokol @end

#pragma sokol @program rt vs fs