bluflame/nordlicht2014-intro/nordlicht2014/test.hlsl

#define	ParticleType_Dead 0
#define	ParticleType_Emitter 1
#define	ParticleType_Point 2
#define	ParticleType_Star 3

#define SDF_SIMILARITY 2.0 // try 0.2 for fractal flames, you can also go up to 64 
#define TANGENT_SPEED 8.0 // increase to add more chaos
#define GRADIENT_SPEED 8.0

RWTexture2D<float4> out0:register(u0);
SamplerState sampler0 : register(s0);
Texture2D tex0: register(t0);
Texture2D tex1: register(t1);
Texture2D tex2: register(t2);
Texture2D tex3: register(t3);
Texture2D tex4: register(t4);
Texture2D tex5: register(t5);
Texture2D tex6: register(t6);
Texture2D tex7: register(t7);

struct ParticleState
{
	int type;
	float3 oldPosition;
	float3 currentPosition;
	float3 direction;
	float3 tangent;
	float creationTime;
	float mass;
	float lifeTime;
};//64 bytes

cbuffer _0 : register(b0)
{
	float4 smoothNoiseColor; // USED // additive to particle state
	float4 colorBlend; // USED
	float3 smoothNoiseDirection; // USED
	float demoTime; // USED
	float3 emitterDirection; // USED
	float deltaTime; // USED
	float3 emitterPosition; // USED
	float emitterRadius; // USED
	float3 cameraPosition; // USED
	float emitRate; // USED// = 0.00001f; //delay in seconds between each particle spawn
	float3 cameraLookat; // USED
	float lifeTime; // USED// = 3.0f; //particle lifetime in seconds
	float3 cameraUp; // USED
	float gravity; // USED
	float3 emitterVelocity; // USED
	float emitChaos; // USED
	float emitterMass; // USED
	float sdfBlendFactor; // USED
	float smoothNoiseSize; // additive to particle state
	float particleMass; // USED // additive to particle state
	float envelope1; // USED
	float envelope2;
	float distort;
	float note; // USED
}; // 44 floats = 176 bytes

struct __1
{
	float4 _d : _dS;
	float4 _c : _cS;
	float4x4 _v : _vS;
	float4x4 _p : _pS;
};

cbuffer _1 : register(b1)
{
	__1 _o;
}; // 40 floats = 160 bytes

cbuffer _2 : register(b2)
{
	__1 _c;
}; // 40 floats = 160 bytes

float4x4 lookTo(float3 Eye, float3 zaxis, float3 Up)
{
	float3 xaxis = normalize(cross(Up, zaxis));
	float3 yaxis = cross(zaxis, xaxis);

	float4x4 result = {
		xaxis, -dot(xaxis, Eye),
		yaxis, -dot(yaxis, Eye),
		zaxis, -dot(zaxis, Eye),
		0, 0, 0, 1
	};

	return transpose(result);
}

// Constant buffer vertex shader
__1 VSCB()
{
	__1 o;

	float3 direction = normalize(cameraLookat - cameraPosition);
	o._v = lookTo(cameraPosition, direction, normalize(cameraUp));
	o._d = float4(direction, 0);
	o._c = float4(cameraPosition, 0);
	o._p = float4x4( // perspective matrix
		1, 0, 0, 0,
		0, 1, 0, 0,
		0, 0, 1, 1,
		0, 0, -1, 0
		);

	return o;
}

#define PI 3.14159265

static uint rndSeed = 0;
static const float starThreshold = 20.0f;

uint hash(uint x)
{
	x += x << 10, x ^= x >> 6, x += x << 3, x ^= x >> 11, x += x << 15; return x;
}

void setRndSeed(uint seed)
{
	rndSeed = seed;
}

float rnd()
{
	return asfloat((rndSeed = hash(rndSeed) & 0x007fffff) | 0x3f800000) - 1;
}

float srnd()
{
	return asfloat((rndSeed = hash(rndSeed) & 0x007fffff) | 0x40000000) - 3;
}

float rnd(uint s)
{
	return asfloat((s & 0x007fffff) | 0x3f800000) - 1;
}

float srnd(uint s)
{
	return asfloat((s & 0x007fffff) | 0x40000000) - 3;
}

static const float2x2 mtx = float2x2(0.80, 0.60, -0.60, 0.80);

float noise(float2 p)
{
	uint idx = (uint)(floor(p.y) * 1024 + floor(p.x));
	return rnd(hash(idx));
}

float fbm4(float2 p)
{
	float f = 0.0;

	f += 0.5000*(noise(p)); p = mul(p*2.02, mtx);
	f += 0.2500*(noise(p)); p = mul(p*2.03, mtx);
	f += 0.1250*(noise(p)); p = mul(p*2.01, mtx);
	f += 0.0625*(noise(p));

	return f / 0.9375;
}

[numthreads(16, 16, 1)]
void csNoise(int3 id:SV_DispatchThreadID)
{
	float2 v = float2(id.x, id.y);
	out0[id.xy] = float4(noise(v), 0, 0, 1);
}

[numthreads(16, 16, 1)]
void csFbm(int3 id:SV_DispatchThreadID)
{
	float2 v = float2(id.x, id.y) / 1024.0;
	float f = 0.0;

	float scale = 0.5;
	float sum = 0.0;
	float mag = 0.25;
	for (int i = 6; i >= 0; --i)
	{
		f += scale * tex0.SampleLevel(sampler0, v, i).r;
		sum += scale;
		v = mul(v * (1.0 + 0.01 * i), mtx);
		scale *= 0.5;
		mag *= 2.0;
	}

	out0[id.xy] = float4(mag * (f / sum - 0.5) + 0.5, 0, 0, 1);
}

ConsumeStructuredBuffer<ParticleState> particles:register(u0);
AppendStructuredBuffer<ParticleState> writeParticles:register(u1);
StructuredBuffer<ParticleState> readParticles:register(t0);

void emit(int type, float3 oldPosition, float3 position, float3 direction, float mass, float time)
{
	ParticleState emittedParticle;
	emittedParticle.type = type;
	emittedParticle.oldPosition = oldPosition;
	emittedParticle.currentPosition = position;
	emittedParticle.creationTime = time;
	emittedParticle.direction = direction;
	emittedParticle.mass = mass;
	emittedParticle.lifeTime = lifeTime;
	emittedParticle.tangent = normalize(float3(srnd(), srnd(), srnd()));
	writeParticles.Append(emittedParticle); // emit new particle
}

void recycle(ParticleState particle)
{
	ParticleState newParticle;
	newParticle.type = particle.type;
	newParticle.oldPosition = particle.currentPosition;
	newParticle.currentPosition = particle.currentPosition + particle.direction * abs(deltaTime);
	newParticle.creationTime = particle.creationTime;
	newParticle.direction = particle.direction + float3(0, gravity * particle.mass, 0) * abs(deltaTime);
	newParticle.mass = particle.mass;
	newParticle.lifeTime = particle.lifeTime;
	newParticle.tangent = particle.tangent;
	writeParticles.Append(newParticle);
}

void emitStar()
{
	float3 pos = cameraPosition + sqrt(rnd()) * starThreshold * normalize(float3(srnd(), srnd(), srnd()));
	emit(ParticleType_Star, pos, pos, float3(0.1, 0.0, 0.1), 0.0f, 0.0f);
}

[numthreads(1, 1, 1)]
void starInit(int3 id:SV_DispatchThreadID)
{
	rndSeed = id.y * 256 + id.x;
	emitStar();
}

float sdSphere(float3 p)
{
	p /= 5;
	return length(p) - 1.0;
}

float sdIso1(float3 p)
{
	p /= 5;
	float A = (p.x * p.x + p.y * p.y + p.z * p.z - 1);
	float B = (p.z - 1);
	float C = (p.z + 1);
	return A * A - (B * B - 2 * p.x * p.x)*(C * C - 2 * p.y * p.y);
}

float sdIso2(float3 p)
{
	return cos(p.x) + cos(p.y) + cos(p.z);
}

float sdIso3(float3 p)
{
	return
		sin(p.x) * sin(p.y) * sin(p.z) +
		sin(p.x) * cos(p.y) * cos(p.z) +
		cos(p.x) * sin(p.y) * cos(p.z) +
		cos(p.x) * cos(p.y) * sin(p.z);
}

float sdBox(float3 p, float3 b)
{
	float3 d = abs(p) - b;
	return min(max(d.x, max(d.y, d.z)), 0.0) + length(max(d, 0.0));
}

float mengerSponge(float3 p)
{
	p /= 3;
	float d = sdBox(p, float3(1.0, 1.0, 1.0));

	float s = 1.0;
	for (int m = 0; m<3; m++)
	{
		float3 a = sign(p) * fmod(p*s, 2.0) - 1.0;
		s *= 3.0;
		float3 r = abs(1.0 - 3.0*abs(a));

		float da = max(r.x, r.y);
		float db = max(r.y, r.z);
		float dc = max(r.z, r.x);
		float c = (min(da, min(db, dc)) - 1.0) / s;

		d = max(d, c);
	}

	return d;
}

float f(float3 p)
{
	float sdfType = floor(sdfBlendFactor);
	float sphere = step(0, sdfType) * (1 - step(1, sdfType));
	float iso1 = step(1, sdfType) * (1 - step(2, sdfType));
	float iso2 = step(2, sdfType) * (1 - step(3, sdfType));
	float iso3 = step(3, sdfType) * (1 - step(4, sdfType));
	float menger = step(4, sdfType) * (1 - step(5, sdfType));
	return sdSphere(p) * sphere + sdIso1(p) * iso1 + sdIso2(p) * iso2 + sdIso3(p) * iso3 + mengerSponge(p) * menger;
}

void doEmitter(float3 particlePosition, float3 particleDirection, float t)
{
	if (demoTime - t >= emitRate)
	{
		float count = ceil((demoTime - t) / emitRate);
		float index = count - 1;
		while (t <= demoTime)
		{
			float3 tangent = normalize(float3(srnd(), srnd(), srnd()));
			if (length(emitterDirection) > 0.0f)
				tangent = cross(normalize(emitterDirection), tangent);
			float3 emitDirection = emitterDirection + emitChaos * normalize(float3(srnd(), srnd(), srnd()));
				float3 newPosition = particlePosition + tangent * sqrt(rnd()) * emitterRadius;
				emit(ParticleType_Point, newPosition, newPosition + emitDirection * deltaTime * (index-- / count), emitDirection, particleMass, t);
			particlePosition += particleDirection * emitRate;
			t += emitRate;
		}
	}
}

void doUpdate(int3 id:SV_DispatchThreadID, bool bPreserveEmitters)
{
	rndSeed = (id.y * 1024 + id.x) * demoTime;
	ParticleState particle = particles.Consume();
	if (particle.type == ParticleType_Emitter)
	{
		float t = particle.creationTime;
		doEmitter(particle.currentPosition, particle.direction, t);

		if (bPreserveEmitters)
		{
			emit(ParticleType_Emitter, particle.currentPosition, particle.currentPosition + particle.direction * abs(deltaTime), particle.direction, particle.mass, demoTime);
		}
	}
	else if (particle.type == ParticleType_Point)
	{
		float age = (demoTime - particle.creationTime) / particle.lifeTime;
		uint index;

		float2 e = float2(0.001, 0);
		float3 p = particle.currentPosition;
		float d = f(p);
		float3 v = -normalize(float3(f(p + e.xyy) - f(p - e.xyy), f(p + e.yxy) - f(p - e.yxy), f(p + e.yyx) - f(p - e.yyx)));
		float3 t = cross(particle.tangent, v);
		v = TANGENT_SPEED * t / (1 + pow(abs(d), 0.5)) + GRADIENT_SPEED * v * d * (0.5 + 0.5 * step(0, -d));
		v = lerp(particle.direction, v, SDF_SIMILARITY * GRADIENT_SPEED * deltaTime * frac(sdfBlendFactor));
		particle.direction = v;
		if (age <= 1)
		{
			recycle(particle);
		}
	}
	else if (particle.type == ParticleType_Star)
	{
		if (distance(particle.currentPosition, cameraPosition) > starThreshold)
		{
			emitStar();
		}
		else
		{
			recycle(particle);
		}
	}

	if ((id.x + id.y == 0) && note > 0.1)
	{
		rndSeed = 1337 * demoTime;
		float3 emitPosition = cameraPosition;
		float3 cameraDirection = normalize(cameraLookat - cameraPosition);
		float3 cameraRight = cross(normalize(cameraUp), cameraDirection);
		emitPosition += 10 * cameraDirection;
		emitPosition -= 7 * normalize(cameraUp);
		emitPosition += (50 * note - 25) * cameraRight;
		float t = demoTime - deltaTime;
		doEmitter(emitPosition, float3(0, 0.0, 0), t);
	}
}

[numthreads(1, 1, 1)]
void update(int3 id:SV_DispatchThreadID)
{
	doUpdate(id, true);
}

[numthreads(1, 1, 1)]
void event1(int3 id:SV_DispatchThreadID)
{
	doUpdate(id, false);
}

[numthreads(1, 1, 1)]
void event2(int3 id:SV_DispatchThreadID)
{
	doUpdate(id, true);
	if (id.x + id.y == 0)
	{
		emit(ParticleType_Emitter, emitterPosition, emitterPosition, emitterVelocity, emitterMass, demoTime);
	}
}

float3 project(float3 v, bool bOld)
{
	float4 r;
	if (bOld)
		r = mul(mul(float4(v, 1.0), _o._v), _o._p);
	else
		r = mul(mul(float4(v, 1.0), _c._v), _c._p);

	r.x /= 1.6;
	return r.xyz / r.w;
}

float3 h2r(float h, float s, float v){ return lerp(saturate((abs(frac(h + float3(1, 2, 3) / 3) * 6 - 3) - 1)), 1, s)*v; }


struct _2
{
	float3 pos1 : TEXCOORD0;
	float3 pos2 : TEXCOORD1;
	float3 dir : TEXCOORD2;
	float age : AGE;
	int type : TYPE;
};

struct _3
{
	float4 pos : SV_POSITION;
	float length : LENGTH;
	float age : AGE;
	float3 wpos : WORLDPOS;
	int type : TYPE;
};

void pvs(uint id : SV_VertexID, out _2 o)
{
	ParticleState particle = readParticles[id];
	o.pos1 = particle.oldPosition;
	o.pos2 = particle.currentPosition;
	o.dir = particle.direction;
	o.age = (demoTime - particle.creationTime) / lifeTime;
	o.type = particle.type;
}

float particleSize(float z)
{
	return (1 + 2 * envelope1) * 0.002f / z;
}

[maxvertexcount(18)]
void pgs(point _2 input[1], inout TriangleStream<_3> o)
{
	_2 p = input[0];

	float3 p1 = project(p.pos1, false);
	float3 p2 = project(p.pos2, false);
	if (p2.z <= 0 || p1.z <= 0 )
		return;

	float s1 = min(0.01, particleSize(p1.z));
	float s2 = min(0.01, particleSize(p2.z));
	float2 d = normalize(p2.xy - p1.xy);
	d += (1.0 - step(0.5, length(float3(d, 0)))) * normalize(project(p.dir, false).xy);
	d += (1.0 - step(0.5, length(float3(d, 0)))) * float2(1, 0);

	float2 pr = float2(-d.y, d.x);
		p1.xy += d * s1 * 0.5;
	p2.xy -= d * s2 * 0.5;

	_3 r;
	r.length = distance(p1.xy, p2.xy) * 128;
	r.age = p.age;
	r.type = p.type;
	r.wpos = p.pos2;

	r.pos = float4(p1.xy - d * s1, p1.z, 1.0); o.Append(r);
	r.pos = float4(p1.xy + pr * s1, p1.z, 1.0); o.Append(r);
	r.pos = float4(p1.xy - pr * s1, p1.z, 1.0); o.Append(r);
	o.RestartStrip();

	r.pos = float4(p1.xy - pr * s1, p1.z, 1.0); o.Append(r);
	r.pos = float4(p1, 1.0); o.Append(r);
	r.pos = float4(p2.xy - pr * s2, p2.z, 1.0); o.Append(r);
	o.RestartStrip();

	r.pos = float4(p1, 1.0); o.Append(r);
	r.pos = float4(p2, 1.0); o.Append(r);
	r.pos = float4(p2.xy - pr * s2, p2.z, 1.0); o.Append(r);
	o.RestartStrip();

	r.pos = float4(p1, 1.0); o.Append(r);
	r.pos = float4(p2.xy + pr * s2, p2.z, 1.0); o.Append(r);
	r.pos = float4(p2, 1.0); o.Append(r);
	o.RestartStrip();

	r.pos = float4(p1, 1.0); o.Append(r);
	r.pos = float4(p1.xy + pr * s1, p1.z, 1.0); o.Append(r);
	r.pos = float4(p2.xy + pr * s2, p2.z, 1.0); o.Append(r);
	o.RestartStrip();

	r.pos = float4(p2.xy + d * s2, p2.z, 1.0); o.Append(r);
	r.pos = float4(p2.xy - pr * s2, p2.z, 1.0); o.Append(r);
	r.pos = float4(p2.xy + pr * s2, p2.z, 1.0); o.Append(r);
	o.RestartStrip();
}

float3 fusion(float x)
{
	float t = saturate(x);
	return saturate(float3(sqrt(t), t*t*t, max(sin(3.1415*1.75*t), pow(t, 12.0))));
}

float noise3d(float3 p)
{
	p += 133 + smoothNoiseDirection * demoTime;
	p /= 1000;
	float n = (
		tex0.SampleLevel(sampler0, p.yz, 0).r +
		tex0.SampleLevel(sampler0, p.xz, 0).r +
		tex0.SampleLevel(sampler0, p.xy, 0).r) / 3.0;
	return smoothstep(0.5 , 1.0, n);
}

float4 pps(_3 i) : SV_Target
{
	float intensity = 1.0 - i.age;
	float3 color = fusion(1.0 - i.age * 3);
	if (i.type == ParticleType_Star)
	{
		float x = (distance(i.wpos, cameraPosition)-1) / starThreshold;
		intensity = 5 * smoothstep(0, 0.2, x)*exp(-x * 10);
		intensity /= (i.length + 8);
	}
	else
	{
		float n = noise3d(i.wpos);
		intensity /= (i.length + 128);
		color = lerp(color, smoothNoiseColor.rgb, smoothNoiseColor.a * n);
	}

	if (i.type == ParticleType_Star)
		color = float3(intensity, intensity, intensity);

	return float4(color, intensity);
}

//---
// Postprocessing computer shaders
//---


float mod(float x, float y)
{
	return x - y * floor(x / y);
}

float2 mod(float2 x, float2 y)
{
	return x - y * floor(x / y);
}

float3 mod(float3 x, float3 y)
{
	return x - y * floor(x / y);
}

float2 mod(float2 x, float y)
{
	return x - y * floor(x / y);
}

float3 mod(float3 x, float y)
{
	return x - y * floor(x / y);
}

float pulse(float center, float width, float x)
{
	float t = abs(x - center);
	if (t > width) return 0;
	t /= width;
	return 1 - t*t*(3 - 2 * t);
}

//---
// Radial and circumferential blur
//---
static const float rcfMipmapFactor = 1.5;
static const float rcfStepFactor = 5;
static const float rcfStrengthRadial = 5;
static const float rcfStrengthCircumferential = 5;
static const float rcfRadius = 15;
static const float2 rcfCenter = { 0.5, 0.5 };

float rcfRadialFalloff(float radius, float amount)
{
	return radius * (1 + amount*radius*0.01);
}

float4 rcfBlur(float2 tc, float2 resolution, float strength, float circumFerentialStrength)
{
	// Direction from rcfCenter to the current tc, aspect ratio corrected
	float2 d = (tc - rcfCenter) * float2(resolution.x / resolution.y, 1);

		// Compute convolution step size
		float delta = length(d);
	float distortedDelta = rcfRadialFalloff(delta, strength);
	float stepSize = abs(delta - distortedDelta) * rcfStepFactor;

	float radius = rcfRadius;
	// Circumferential blur
	if (circumFerentialStrength > 0) {
		d = float2(d.y, -d.x);
		stepSize *= circumFerentialStrength;
		radius = floor(rcfRadius * circumFerentialStrength);
	}

	// Early exit
	if (radius <= 0.5) {// || stepSize <= 1/resolution.x) {
		return tex0.SampleLevel(sampler0, tc, 0);
	}

	// Adjust direction
	d = normalize(d) * stepSize / resolution;

	// Convolution
	float mipLevel = sqrt(stepSize) * rcfMipmapFactor;
	float sigma = radius / 2;
	float twoSigmaSquared = 2 * sigma * sigma;
	float4 a = 0;
	for (float i = -radius; i <= radius; ++i) {
		float weight = exp(-i*i / twoSigmaSquared);
		a += tex0.SampleLevel(sampler0, i * d + tc, mipLevel) * weight;
	}

	return a / sqrt(twoSigmaSquared * PI);
}

[numthreads(16, 16, 1)] void csRadialBlur(int3 id:SV_DispatchThreadID)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 tc = (id.xy + 0.5) / resolution;

		out0[id.xy] = rcfBlur(tc, resolution, rcfStrengthRadial, 0);
}

[numthreads(16, 16, 1)] void csCircumferentialBlur(int3 id:SV_DispatchThreadID)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 tc = (id.xy + 0.5) / resolution;

		out0[id.xy] = rcfBlur(tc, resolution, rcfStrengthCircumferential, 1);
}

//---
// Sensor dirt
//---

[numthreads(16, 16, 1)] void csSensorDirt(int3 id:SV_DispatchThreadID)
{
	float2 tc = id.xy + .5;
}

//---
// Lens dirt
//---
static const float ldMinRadius = 0.025;
static const float ldMaxRadius = 0.075;
static const float ldCellWidth = 3 * ldMaxRadius;
static const float ldBorderWidthHalf = 0.00125;
static const float ldSeed = 3;
static const float ldNumLayers = 4;

[numthreads(16, 16, 1)] void csLensDirt(int3 id:SV_DispatchThreadID)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 tc = (id.xy + 0.5) / resolution;
		tc *= float2(resolution.x / resolution.y, 1);
	//float2 tc = id.xy + .5;

	rndSeed = ldSeed;

	float4 a = 0;
	for (int i = 0; i < ldNumLayers; ++i) {
		// Modulo repeat, find cell
		float2 p = mod(tc, ldCellWidth) - ldCellWidth / 2;
			float2 c = floor(tc / ldCellWidth);

			// Backup seed
			uint seedBackup = rndSeed;

		// Modifiy seed with cell coordinates
		rndSeed += (c.x + c.y*ldCellWidth + i*ldCellWidth*ldCellWidth) * resolution.x;

		// Determine radius and jitter
		float r = lerp(ldMinRadius, ldMaxRadius, rnd());
		p += float2(srnd(), srnd()) * (ldCellWidth / 2 - r);

		// Shapes
		// Hexagon
		//p = abs(p);
		//float d = max(p.y + p.x*0.57735, p.x*1.1547);

		// Circle
		//float d = length(p);

		// Pentagon
		//float phi = 0.145;
		//float2 n[] = {
		//	{ sin(0*PI/5 + phi), cos(0*PI/5 + phi) },
		//	{ sin(2*PI/5 + phi), cos(2*PI/5 + phi) },
		//	{ sin(4*PI/5 + phi), cos(4*PI/5 + phi) },
		//	{ sin(6*PI/5 + phi), cos(6*PI/5 + phi) },
		//	{ sin(8*PI/5 + phi), cos(8*PI/5 + phi) }
		//};
		//// Difference between circumcircle and incircle radii
		//float delta = r - (1 + sqrt(5)) / 4 * r;
		//float d = max(max(max(max(dot(p, n[0]), dot(p, n[1])), dot(p, n[2])), dot(p, n[3])), dot(p, n[4]));
		//// Mix between sphere and pentagon
		//d = lerp(length(p), d+ delta, 0.5);
		float d = length(p);

		// Random color
		a += (float4(rnd(), rnd(), rnd(), 1) + 0.5) * (smoothstep(r, r - ldBorderWidthHalf * 2, d) + 0.25 * smoothstep(ldBorderWidthHalf, 0, abs(d - r + ldBorderWidthHalf * 2)));
		//a += float4(c, 0, 1)*0.1;

		// Restore seed
		rndSeed = seedBackup;

		// Displace grid
		tc += ldCellWidth / ldNumLayers;
	}

	//out0[id.xy] = float4(a.xyz / ldNumLayers, 1);
	out0[id.xy] = float4(a.xyz / ldNumLayers, 1);
}

//---
// Blur
//---
static const float bRadius = 160;
static const float bSigma = bRadius / 3.5;
static const float bTwoSigmaSquared = 2 * bSigma * bSigma;

void bBlur(int3 id, float2 direction)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 sourceResolution;
	tex0.GetDimensions(sourceResolution.x, sourceResolution.y);

	float mipLevel = log2(sourceResolution.x / resolution.x);

	float2 tc = (id.xy + 0.5) / resolution;
		float2 d = direction / resolution;

		float4 a = 0;
	for (float i = -bRadius; i <= bRadius; ++i) {
		float weight = exp(-i*i / bTwoSigmaSquared);
		a += tex0.SampleLevel(sampler0, i * d + tc, mipLevel) * weight;
	}

	out0[id.xy] = a / sqrt(bTwoSigmaSquared * PI);
}

[numthreads(16, 16, 1)] void csBlurH(int3 id:SV_DispatchThreadID) { bBlur(id, float2(1, 0)); }
[numthreads(16, 16, 1)] void csBlurV(int3 id:SV_DispatchThreadID) { bBlur(id, float2(0, 1)); }

//---
// Streaks
//---
static const float stRadius = 160;

[numthreads(16, 16, 1)] void csStreaks(int3 id:SV_DispatchThreadID)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 sourceResolution;
	tex0.GetDimensions(sourceResolution.x, sourceResolution.y);

	float mipLevel = log2(sourceResolution.x / resolution.x);

	float2 tc = (id.xy + 0.5) / resolution;
		float2 d = float2(1, 0) / resolution;

		// Convolution with parabolic tent filter
		float4 a = 0;
	for (float i = -stRadius + 1; i < stRadius; ++i) {
		float weight = (stRadius - abs(i)) * (stRadius - abs(i));
		a += tex0.SampleLevel(sampler0, i * d + tc, mipLevel) * weight;
	}

	out0[id.xy] = a * 1.5 / (stRadius * stRadius * stRadius);
}

//---
// Distort Chroma
//---
static const float dcStrength = 10.0;

static const float2 dcCenter = { 0.5, 0.5 };
static const int dcSamples = 12;

float dcRadialFalloff(float radius, float amount)
{
	return radius * (1 + amount*radius*0.01);
}

float4 dcSample(float2 tc, float amount, float2 resolution)
{
	// Direction from cdCenter to the current tc, aspect ratio corrected
	float2 d = (tc - dcCenter) * float2(resolution.x / resolution.y, 1);
		float radius = length(d);
	d /= radius == 0 ? d : radius;
	return tex0.SampleLevel(sampler0, dcCenter + d * dcRadialFalloff(radius, amount) / float2(resolution.x / resolution.y, 1), 0);
}

[numthreads(16, 16, 1)] void csDistortChroma(int3 id:SV_DispatchThreadID)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 tc = (id.xy + 0.5) / resolution;

		float4 original = tex0.SampleLevel(sampler0, tc, 0);
	if (dcStrength == 0) {
		out0[id.xy] = original;
		return;
	}

	// Accumulate along spectrum
	float4 a = 0;
	for (int i = 1; i <= dcSamples; ++i) {
		float lambda = 0.4f * (i / float(dcSamples + 1)) + 0.35f;
		float4 w = float4(pulse(0.65, 0.1, lambda), pulse(0.55, 0.1, lambda), pulse(0.45, 0.1, lambda), 0.25) * 4.0;
			a += w * dcSample(tc, -(i - 1) / float(dcSamples) * dcStrength, resolution);
	}

	a /= dcSamples;

	out0[id.xy] = lerp(original, a, saturate(dcStrength));
}

//---
// Ghosts
//---
float4 ghRainbow(float angle)
{
	return float4(sin(angle), sin(angle + 3.1415*2.0 / 3.0), sin(angle + 3.1415*4.0 / 3.0), 1) * 0.5 + 0.5;
}

[numthreads(16, 16, 1)] void csGhosts(int3 id:SV_DispatchThreadID)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 tc = (id.xy + 0.5) / resolution;
		tc = 1 - tc;
	float2 texelSize = 1 / resolution;
		float2 aspectCorrection = float2(resolution.x / resolution.y, 1);

		float2 direction = (0.5 - tc) * 2;
		float4 a = 0;
	for (int i = 0; i < 5; ++i) {
		float2 sc0 = 1 - frac(tc + direction * i * 0.2);
			float2 sc1 = 1 - frac(tc + direction * i * 0.1999);
			float r = length((sc0 - 0.5) * aspectCorrection);
		a += max(0, tex0.SampleLevel(sampler0, sc0, 0) - 0.125) * lerp(1, ghRainbow(r * 20), 1.5*r);
		a += max(0, tex1.SampleLevel(sampler0, sc0, 0) - 0.125) * lerp(1, ghRainbow(r * 15 + i), 1.5*r);
	}

	out0[id.xy] = float4(a.xyz / 5, 1);
}


//---
// Merge
//---
float3 saturation(float3 color, float saturation)
{
	return lerp(dot(color, float3(0.2126, 0.7152, 0.0722)), color, saturation);
}

float3 liftGammaGain(float3 color, float3 lift, float3 gamma, float3 gain)
{
	return pow(saturate(gain*color + lift*(-gain*color + 1)), 1 / gamma);
}

float3 uncharted2ToneMapping(float3 c)
{
	float A = 0.15;
	float B = 0.50;
	float C = 0.10;
	float D = 0.20;
	float E = 0.02;
	float F = 0.30;
	float W = 11.2;

	c = ((c * (A * c + C * B) + D * E) / (c * (A * c + B) + D * F)) - E / F;
	float white = ((W * (A * W + C * B) + D * E) / (W * (A * W + B) + D * F)) - E / F;
	return c / white;
}

[numthreads(16, 16, 1)] void csMerge(int3 id:SV_DispatchThreadID)
{
	float2 resolution;
	out0.GetDimensions(resolution.x, resolution.y);

	float2 tc = (id.xy + 0.5) / resolution;
		tc.x += sin((tc.y + demoTime) * 44) * 0.05 * distort;

		rndSeed = (id.y * 720 + id.x);// * int(time * 1000);
	float3 rndNoiseXYT = float3(rnd(), rnd(), rnd());

		rndSeed = id.y;
	float3 rndNoiseY = float3(rnd(), rnd(), rnd());


		float3 base = tex0.SampleLevel(sampler0, tc, 0).xyz;
		float3 blur1 = tex1.SampleLevel(sampler0, tc, 0).xyz;
		float3 blur8 = tex2.SampleLevel(sampler0, tc, 0).xyz;
		float3 blur32 = tex3.SampleLevel(sampler0, tc, 0).xyz;
		float3 streaks = tex4.SampleLevel(sampler0, tc, 0).xyz;
		float3 lensDirt = tex5.SampleLevel(sampler0, tc, 0).xyz;
		float3 ghosts = tex6.SampleLevel(sampler0, tc, 0).xyz; // t6

		float3 color = base.xyz;

		color += blur1*0.125;
	color += blur8*0.125;
	color += blur32*0.125;

	// Streaks
	color += streaks * (lerp(1, rndNoiseY.x, 0.25)) * 0.25;// * rnd();

	// Lens dirt
	color += lensDirt * 0.25 * max(0, dot(tex2.SampleLevel(sampler0, frac(1-tc), 0).xyz, float3(0.299, 0.587, 0.114)) - 1.0);

	// Ghosts
	color += ghosts * 0.125;// * ghosts * 0.25;

	// Grain
	color *= lerp(1, rndNoiseXYT, 0.35);

	//color = base;


	// Tonemapping
	color = max(0, uncharted2ToneMapping(max(0, color*0.5)));
	//color *= color;

	color = liftGammaGain(color, float3(0, 0, 0), float3(1, 1, 1), float3(1, 1, 1));
	color = pow(color, 1 / 2.2);
	color = saturation(color, 1.2);
	//color = pow(color, 1 / 2.2);
	color = lerp(color, colorBlend.rgb, colorBlend.a);
	float4 result = float4(color, dot(color, float3(0.299, 0.587, 0.114)));

		out0[id.xy] = result;
}