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gentexture.cpp
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gentexture.cpp
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/****************************************************************************/
/*** ***/
/*** Written by Fabian Giesen. ***/
/*** I hereby place this code in the public domain. ***/
/*** ***/
/****************************************************************************/
#include "gentexture.hpp"
/****************************************************************************/
/*** ***/
/*** Helpers ***/
/*** ***/
/****************************************************************************/
// Return sTRUE if x is a power of 2, sFALSE otherwise
static sBool IsPowerOf2(sInt x)
{
return (x & (x-1)) == 0;
}
// Returns floor(log2(x))
static sInt FloorLog2(sInt x)
{
sInt res = 0;
if(x & 0xffff0000) x >>= 16, res += 16;
if(x & 0x0000ff00) x >>= 8, res += 8;
if(x & 0x000000f0) x >>= 4, res += 4;
if(x & 0x0000000c) x >>= 2, res += 2;
if(x & 0x00000002) res++;
return res;
}
// Multiply intensities.
// Returns the result of round(a*b/65535.0)
static sU32 MulIntens(sU32 a,sU32 b)
{
sU32 x = a*b + 0x8000;
return (x + (x >> 16)) >> 16;
}
// Returns the result of round(a*b/65536)
static sInt MulShift16(sInt a,sInt b)
{
return (sS64(a) * sS64(b) + 0x8000) >> 16;
}
// Returns the result of round(a*b/256)
static sU32 UMulShift8(sU32 a,sU32 b)
{
return (sU64(a) * sU64(b) + 0x80) >> 8;
}
// Linearly interpolate between a and b with t=0..65536 [0,1]
// 0<=a,b<65536.
static sInt Lerp(sInt t,sInt a,sInt b)
{
return a + ((t * (b-a)) >> 16);
}
static sF32 LerpF(sF32 t,sF32 a,sF32 b)
{
return a + t * (b - a);
}
// Perlin permutation table
static sU16 Ptable[4096];
static sU32 *Ptemp;
static sInt P(sInt i)
{
return Ptable[i&4095];
}
// Initialize perlin
static int InitPerlinCompare(const void *e1, const void *e2)
{
unsigned i1 = Ptemp[*((sU16 *) e1)];
unsigned i2 = Ptemp[*((sU16 *) e2)];
return i1-i2;
}
static void InitPerlin()
{
sU32 seed = 0x93638245u;
Ptemp = new sU32[4096];
// generate 4096 pseudorandom numbers using LFSR
for(sInt i=0;i<4096;i++)
{
Ptemp[i] = seed;
seed = (seed << 1) ^ ((seed & 0x80000000u) ? 0xc0000401u : 0);
}
for(sInt i=0;i<4096;i++)
Ptable[i] = i;
qsort(Ptable,4096,sizeof(*Ptable),InitPerlinCompare);
delete[] Ptemp;
Ptemp = 0;
}
// Perlin gradient function
static sF32 PGradient2(sInt hash,sF32 x,sF32 y)
{
hash &= 7;
sF32 u = hash<4 ? x : y;
sF32 v = hash<4 ? y : x;
return ((hash&1) ? -u : u) + ((hash&2) ? -2.0f*v : 2.0f*v);
}
// Perlin smoothstep function
static sF32 SmoothStep(sF32 x)
{
return x*x*x*(10+x*(6*x-15));
}
// 2D non-bandlimited noise function
static sF32 Noise2(sInt x,sInt y,sInt maskx,sInt masky,sInt seed)
{
static const sInt M = 0x10000;
sInt X = x >> 16,Y = y >> 16;
sF32 fx = (x & (M-1)) / 65536.0f;
sF32 fy = (y & (M-1)) / 65536.0f;
sF32 u = SmoothStep(fx);
sF32 v = SmoothStep(fy);
maskx &= 4095;
masky &= 4095;
return
LerpF(v,
LerpF(u,
(P(((X+0)&maskx)+P(((Y+0)&masky))+seed)) / 2047.5f - 1.0f,
(P(((X+1)&maskx)+P(((Y+0)&masky))+seed)) / 2047.5f - 1.0f),
LerpF(u,
(P(((X+0)&maskx)+P(((Y+1)&masky))+seed)) / 2047.5f - 1.0f,
(P(((X+1)&maskx)+P(((Y+1)&masky))+seed)) / 2047.5f - 1.0f));
}
// 2D Perlin noise function
static sF32 PNoise2(sInt x,sInt y,sInt maskx,sInt masky,sInt seed)
{
static const sInt M = 0x10000;
static const sF32 S = sFInvSqrt(5.0f);
sInt X = x >> 16,Y = y >> 16;
sF32 fx = (x & (M-1)) / 65536.0f;
sF32 fy = (y & (M-1)) / 65536.0f;
sF32 u = SmoothStep(fx);
sF32 v = SmoothStep(fy);
maskx &= 4095;
masky &= 4095;
return S *
LerpF(v,
LerpF(u,
PGradient2((P(((X+0)&maskx)+P(((Y+0)&masky))+seed)),fx ,fy),
PGradient2((P(((X+1)&maskx)+P(((Y+0)&masky))+seed)),fx-1.0f,fy)),
LerpF(u,
PGradient2((P(((X+0)&maskx)+P(((Y+1)&masky))+seed)),fx ,fy-1.0f),
PGradient2((P(((X+1)&maskx)+P(((Y+1)&masky))+seed)),fx-1.0f,fy-1.0f)));
}
static sInt GShuffle(sInt x,sInt y,sInt z)
{
/*sU32 seed = ((x & 0x3ff) << 20) | ((y & 0x3ff) << 10) | (z & 0x3ff);
seed ^= seed << 3;
seed += seed >> 5;
seed ^= seed << 4;
seed += seed >> 17;
seed ^= seed << 25;
seed += seed >> 6;
return seed;*/
return P(P(P(x)+y)+z);
}
// 2D grid noise function (tiling)
static sF32 GNoise2(sInt x,sInt y,sInt maskx,sInt masky,sInt seed)
{
// input coordinates
sInt i = x >> 16;
sInt j = y >> 16;
sF32 xp = (x & 0xffff) / 65536.0f;
sF32 yp = (y & 0xffff) / 65536.0f;
sF32 sum = 0.0f;
// sum over grid vertices
for(sInt oy=0;oy<=1;oy++)
{
for(sInt ox=0;ox<=1;ox++)
{
sF32 xr = xp - ox;
sF32 yr = yp - oy;
sF32 t = xr*xr + yr*yr;
if(t < 1.0f)
{
t = 1.0f - t;
t *= t;
t *= t;
sum += t*PGradient2(GShuffle((i+ox)&maskx,(j+oy)&masky,seed),xr,yr);
}
}
}
return sum;
}
/****************************************************************************/
/*** ***/
/*** Pixel ***/
/*** ***/
/****************************************************************************/
void Pixel::Init(sU8 _r,sU8 _g,sU8 _b,sU8 _a)
{
r = (_r << 8) | _r;
g = (_g << 8) | _g;
b = (_b << 8) | _b;
a = (_a << 8) | _a;
}
void Pixel::Init(sU32 rgba)
{
sU8 rv,gv,bv,av;
rv = (rgba >> 16) & 0xff;
gv = (rgba >> 8) & 0xff;
bv = (rgba >> 0) & 0xff;
av = (rgba >> 24) & 0xff;
a = (av << 8) | av;
r = MulIntens((rv << 8) | rv,a);
g = MulIntens((gv << 8) | gv,a);
b = MulIntens((bv << 8) | bv,a);
}
void Pixel::Lerp(sInt t,const Pixel &x,const Pixel &y)
{
r = ::Lerp(t,x.r,y.r);
g = ::Lerp(t,x.g,y.g);
b = ::Lerp(t,x.b,y.b);
a = ::Lerp(t,x.a,y.a);
}
void Pixel::CompositeAdd(const Pixel &x)
{
r = sClamp<sInt>(r + x.r,0,65535);
g = sClamp<sInt>(g + x.g,0,65535);
b = sClamp<sInt>(b + x.b,0,65535);
a = sClamp<sInt>(a + x.a,0,65535);
}
void Pixel::CompositeMulC(const Pixel &x)
{
r = MulIntens(r,x.r);
g = MulIntens(g,x.g);
b = MulIntens(b,x.b);
a = MulIntens(a,x.a);
}
void Pixel::CompositeROver(const Pixel &x)
{
sInt transIn = 65535 - x.a;
r = MulIntens(transIn,r) + x.r;
g = MulIntens(transIn,g) + x.g;
b = MulIntens(transIn,b) + x.b;
a = MulIntens(transIn,a) + x.a;
}
void Pixel::CompositeScreen(const Pixel &x)
{
r += MulIntens(x.r,65535-r);
g += MulIntens(x.g,65535-g);
b += MulIntens(x.b,65535-b);
a += MulIntens(x.a,65535-a);
}
/****************************************************************************/
/*** ***/
/*** GenTexture ***/
/*** ***/
/****************************************************************************/
GenTexture::GenTexture()
{
Data = 0;
XRes = 0;
YRes = 0;
UpdateSize();
}
GenTexture::GenTexture(sInt xres,sInt yres)
{
Data = 0;
XRes = 0;
YRes = 0;
Init(xres,yres);
}
GenTexture::GenTexture(const GenTexture &x)
{
XRes = x.XRes;
YRes = x.YRes;
UpdateSize();
Data = new Pixel[NPixels];
sCopyMem(Data,x.Data,NPixels * sizeof(Pixel));
}
GenTexture::~GenTexture()
{
delete[] Data;
}
void GenTexture::Init(sInt xres,sInt yres)
{
if(XRes != xres || YRes != yres)
{
delete[] Data;
sVERIFY(IsPowerOf2(xres));
sVERIFY(IsPowerOf2(yres));
XRes = xres;
YRes = yres;
UpdateSize();
Data = new Pixel[NPixels];
}
}
void GenTexture::UpdateSize()
{
NPixels = XRes * YRes;
ShiftX = FloorLog2(XRes);
ShiftY = FloorLog2(YRes);
MinX = 1 << (24 - 1 - ShiftX);
MinY = 1 << (24 - 1 - ShiftY);
}
void GenTexture::Swap(GenTexture &x)
{
sSwap(Data,x.Data);
sSwap(XRes,x.XRes);
sSwap(YRes,x.YRes);
sSwap(NPixels,x.NPixels);
sSwap(ShiftX,x.ShiftX);
sSwap(ShiftY,x.ShiftY);
sSwap(MinX,x.MinX);
sSwap(MinY,x.MinY);
}
GenTexture &GenTexture::operator =(const GenTexture &x)
{
GenTexture t=x;
Swap(t);
return *this;
}
sBool GenTexture::SizeMatchesWith(const GenTexture &x) const
{
return XRes == x.XRes && YRes == x.YRes;
}
// ---- Sampling helpers
void GenTexture::SampleNearest(Pixel &result,sInt x,sInt y,sInt wrapMode) const
{
if(wrapMode & 1) x = sClamp(x,MinX,0x1000000-MinX);
if(wrapMode & 2) y = sClamp(y,MinY,0x1000000-MinY);
x &= 0xffffff;
y &= 0xffffff;
sInt ix = x >> (24 - ShiftX);
sInt iy = y >> (24 - ShiftY);
result = Data[(iy << ShiftX) + ix];
}
void GenTexture::SampleBilinear(Pixel &result,sInt x,sInt y,sInt wrapMode) const
{
if(wrapMode & 1) x = sClamp(x,MinX,0x1000000-MinX);
if(wrapMode & 2) y = sClamp(y,MinY,0x1000000-MinY);
x = (x - MinX) & 0xffffff;
y = (y - MinY) & 0xffffff;
sInt x0 = x >> (24 - ShiftX);
sInt x1 = (x0 + 1) & (XRes - 1);
sInt y0 = y >> (24 - ShiftY);
sInt y1 = (y0 + 1) & (YRes - 1);
sInt fx = sU32(x << (ShiftX + 8)) >> 16;
sInt fy = sU32(y << (ShiftY + 8)) >> 16;
Pixel t0,t1;
t0.Lerp(fx,Data[(y0 << ShiftX) + x0],Data[(y0 << ShiftX) + x1]);
t1.Lerp(fx,Data[(y1 << ShiftX) + x0],Data[(y1 << ShiftX) + x1]);
result.Lerp(fy,t0,t1);
}
void GenTexture::SampleFiltered(Pixel &result,sInt x,sInt y,sInt filterMode) const
{
if(filterMode & FilterBilinear)
SampleBilinear(result,x,y,filterMode);
else
SampleNearest(result,x,y,filterMode);
}
void GenTexture::SampleGradient(Pixel &result,sInt x) const
{
x = sClamp(x,0,1<<24);
x -= x >> ShiftX; // x=(1<<24) -> Take rightmost pixel
sInt x0 = x >> (24 - ShiftX);
sInt x1 = (x0 + 1) & (XRes - 1);
sInt fx = sU32(x << (ShiftX + 8)) >> 16;
result.Lerp(fx,Data[x0],Data[x1]);
}
// ---- The operators themselves
void GenTexture::Noise(const GenTexture &grad,sInt freqX,sInt freqY,sInt oct,sF32 fadeoff,sInt seed,sInt mode)
{
sVERIFY(oct > 0);
seed = P(seed);
sInt offset;
sF32 scaling;
if(mode & NoiseNormalize)
scaling = (fadeoff - 1.0f) / (sFPow(fadeoff,oct) - 1.0f);
else
scaling = sMin(1.0f,1.0f / fadeoff);
if(mode & NoiseAbs) // absolute mode
{
offset = 0;
scaling *= (1 << 24);
}
else
{
offset = 1 << 23;
scaling *= (1 << 23);
}
sInt offsX = (1 << (16 - ShiftX + freqX)) >> 1;
sInt offsY = (1 << (16 - ShiftY + freqY)) >> 1;
Pixel *out = Data;
for(sInt y=0;y<YRes;y++)
{
for(sInt x=0;x<XRes;x++)
{
sInt n = offset;
sF32 s = scaling;
sInt px = (x << (16 - ShiftX + freqX)) + offsX;
sInt py = (y << (16 - ShiftY + freqY)) + offsY;
sInt mx = (1 << freqX) - 1;
sInt my = (1 << freqY) - 1;
for(sInt i=0;i<oct;i++)
{
sF32 nv = (mode & NoiseBandlimit) ? Noise2(px,py,mx,my,seed) : GNoise2(px,py,mx,my,seed);
if(mode & NoiseAbs)
nv = sFAbs(nv);
n += nv * s;
s *= fadeoff;
px += px;
py += py;
mx += mx + 1;
my += my + 1;
}
grad.SampleGradient(*out,n);
out++;
}
}
}
void GenTexture::GlowRect(const GenTexture &bgTex,const GenTexture &grad,sF32 orgx,sF32 orgy,sF32 ux,sF32 uy,sF32 vx,sF32 vy,sF32 rectu,sF32 rectv)
{
sVERIFY(SizeMatchesWith(bgTex));
// copy background over (if we're not the background texture already)
if(this != &bgTex)
*this = bgTex;
// calculate bounding rect
sInt minX = sMax<sInt>(0,floor((orgx - sFAbs(ux) - sFAbs(vx)) * XRes));
sInt minY = sMax<sInt>(0,floor((orgy - sFAbs(uy) - sFAbs(vy)) * YRes));
sInt maxX = sMin<sInt>(XRes-1,ceil((orgx + sFAbs(ux) + sFAbs(vx)) * XRes));
sInt maxY = sMin<sInt>(YRes-1,ceil((orgy + sFAbs(uy) + sFAbs(vy)) * YRes));
// solve for u0,v0 and deltas (cramer's rule)
sF32 detM = ux*vy - uy*vx;
if(fabs(detM) * XRes * YRes < 0.25f) // smaller than a pixel? skip it.
return;
sF32 invM = (1 << 16) / detM;
sF32 rmx = (minX + 0.5f) / XRes - orgx;
sF32 rmy = (minY + 0.5f) / YRes - orgy;
sInt u0 = (rmx*vy - rmy*vx) * invM;
sInt v0 = (ux*rmy - uy*rmx) * invM;
sInt dudx = vy * invM / XRes;
sInt dvdx = -uy * invM / XRes;
sInt dudy = -vx * invM / YRes;
sInt dvdy = ux * invM / YRes;
sInt ruf = sMin<sInt>(rectu * 65536.0f,65535);
sInt rvf = sMin<sInt>(rectv * 65536.0f,65535);
sF32 gus = 1.0f / (65536.0f - ruf);
sF32 gvs = 1.0f / (65536.0f - rvf);
for(sInt y=minY;y<=maxY;y++)
{
Pixel *out = &Data[y*XRes + minX];
sInt u = u0;
sInt v = v0;
for(sInt x=minX;x<=maxX;x++)
{
if(u>-65536 && u<65536 && v>-65536 && v<65536)
{
Pixel col;
sInt du = sMax(sAbs(u) - ruf,0);
sInt dv = sMax(sAbs(v) - rvf,0);
if(!du && !dv)
{
grad.SampleGradient(col,0);
out->CompositeROver(col);
}
else
{
sF32 dus = du * gus;
sF32 dvs = dv * gvs;
sF32 dist = dus*dus + dvs*dvs;
if(dist < 1.0f)
{
grad.SampleGradient(col,(1 << 24) * sFSqrt(dist));
out->CompositeROver(col);
}
}
}
u += dudx;
v += dvdx;
out++;
}
u0 += dudy;
v0 += dvdy;
}
}
struct CellPoint
{
sInt x;
sInt y;
sInt distY;
sInt node;
};
void GenTexture::Cells(const GenTexture &grad,const CellCenter *centers,sInt nCenters,sF32 amp,sInt mode)
{
sVERIFY(((mode & 1) == 0) ? nCenters >= 1 : nCenters >= 2);
Pixel *out = Data;
CellPoint *points = NULL;
points = new CellPoint[nCenters];
// convert cell center coordinates to fixed point
static const sInt scaleF = 14; // should be <=14 for 32-bit ints.
static const sInt scale = 1<<scaleF;
for(sInt i=0;i<nCenters;i++)
{
points[i].x = sInt(centers[i].x * scale + 0.5f) & (scale - 1);
points[i].y = sInt(centers[i].y * scale + 0.5f) & (scale - 1);
points[i].distY = -1;
points[i].node = i;
}
sInt stepX = 1 << (scaleF - ShiftX);
sInt stepY = 1 << (scaleF - ShiftY);
sInt yc = stepY >> 1;
amp = amp * (1 << 24);
for(sInt y=0;y<YRes;y++)
{
sInt xc = stepX >> 1;
// calculate new y distances
for(sInt i=0;i<nCenters;i++)
{
sInt dy = (yc - points[i].y) & (scale - 1);
points[i].distY = sSquare(sMin(dy,scale-dy));
}
// (insertion) sort by y-distance
for(sInt i=1;i<nCenters;i++)
{
CellPoint v = points[i];
sInt j = i;
while(j && points[j-1].distY > v.distY)
{
points[j] = points[j-1];
j--;
}
points[j] = v;
}
sInt best,best2;
sInt besti,best2i;
best = best2 = sSquare(scale);
besti = best2i = -1;
for(sInt x=0;x<XRes;x++)
{
sInt t,dx;
// update "best point" stats
if(besti != -1 && best2i != -1)
{
dx = (xc - points[besti].x) & (scale - 1);
best = sSquare(sMin(dx,scale-dx)) + points[besti].distY;
dx = (xc - points[best2i].x) & (scale - 1);
best2 = sSquare(sMin(dx,scale-dx)) + points[best2i].distY;
if(best2 < best)
{
sSwap(best,best2);
sSwap(besti,best2i);
}
}
// search for better points
for(sInt i=0;i<nCenters && best2 > points[i].distY;i++)
{
sInt dx = (xc - points[i].x) & (scale - 1);
dx = sSquare(sMin(dx,scale-dx));
sInt dist = dx + points[i].distY;
if(dist < best)
{
best2 = best;
best2i = besti;
best = dist;
besti = i;
}
else if(dist > best && dist < best2)
{
best2 = dist;
best2i = i;
}
}
// color the pixel accordingly
sF32 d0 = sFSqrt(best) / scale;
if((mode & 1) == CellInner) // inner
t = sClamp<sInt>(d0*amp,0,1<<24);
else // outer
{
sF32 d1 = sFSqrt(best2) / scale;
if(d0+d1 > 0.0f)
t = sClamp<sInt>(d0 / (d1 + d0) * 2 * amp,0,1<<24);
else
t = 0;
}
grad.SampleGradient(*out,t);
out[0].CompositeMulC(centers[points[besti].node].color);
out++;
xc += stepX;
}
yc += stepY;
}
delete[] points;
}
void GenTexture::ColorMatrixTransform(const GenTexture &x,const Matrix44 &matrix,sBool clampPremult)
{
sInt m[4][4];
sVERIFY(SizeMatchesWith(x));
for(sInt i=0;i<4;i++)
{
for(sInt j=0;j<4;j++)
{
sVERIFY(matrix[i][j] >= -127.0f && matrix[i][j] <= 127.0f);
m[i][j] = matrix[i][j] * 65536.0f;
}
}
for(sInt i=0;i<NPixels;i++)
{
Pixel &out = Data[i];
const Pixel &in = x.Data[i];
sInt r = MulShift16(m[0][0],in.r) + MulShift16(m[0][1],in.g) + MulShift16(m[0][2],in.b) + MulShift16(m[0][3],in.a);
sInt g = MulShift16(m[1][0],in.r) + MulShift16(m[1][1],in.g) + MulShift16(m[1][2],in.b) + MulShift16(m[1][3],in.a);
sInt b = MulShift16(m[2][0],in.r) + MulShift16(m[2][1],in.g) + MulShift16(m[2][2],in.b) + MulShift16(m[2][3],in.a);
sInt a = MulShift16(m[3][0],in.r) + MulShift16(m[3][1],in.g) + MulShift16(m[3][2],in.b) + MulShift16(m[3][3],in.a);
if(clampPremult)
{
out.a = sClamp<sInt>(a,0,65535);
out.r = sClamp<sInt>(r,0,out.a);
out.g = sClamp<sInt>(g,0,out.a);
out.b = sClamp<sInt>(b,0,out.a);
}
else
{
out.r = sClamp<sInt>(r,0,65535);
out.g = sClamp<sInt>(g,0,65535);
out.b = sClamp<sInt>(b,0,65535);
out.a = sClamp<sInt>(a,0,65535);
}
}
}
void GenTexture::CoordMatrixTransform(const GenTexture &in,const Matrix44 &matrix,sInt mode)
{
sInt scaleX = 1 << (24 - ShiftX);
sInt scaleY = 1 << (24 - ShiftY);
sInt dudx = matrix[0][0] * scaleX;
sInt dudy = matrix[0][1] * scaleY;
sInt dvdx = matrix[1][0] * scaleX;
sInt dvdy = matrix[1][1] * scaleY;
sInt u0 = matrix[0][3] * (1 << 24) + ((dudx + dudy) >> 1);
sInt v0 = matrix[1][3] * (1 << 24) + ((dvdx + dvdy) >> 1);
Pixel *out = Data;
for(sInt y=0;y<YRes;y++)
{
sInt u = u0;
sInt v = v0;
for(sInt x=0;x<XRes;x++)
{
in.SampleFiltered(*out,u,v,mode);
u += dudx;
v += dvdx;
out++;
}
u0 += dudy;
v0 += dvdy;
}
}
void GenTexture::ColorRemap(const GenTexture &inTex,const GenTexture &mapR,const GenTexture &mapG,const GenTexture &mapB)
{
sVERIFY(SizeMatchesWith(inTex));
for(sInt i=0;i<NPixels;i++)
{
const Pixel &in = inTex.Data[i];
Pixel &out = Data[i];
if(in.a == 65535) // alpha==1, everything easy.
{
Pixel colR,colG,colB;
mapR.SampleGradient(colR,(in.r << 8) + ((in.r + 128) >> 8));
mapG.SampleGradient(colG,(in.g << 8) + ((in.g + 128) >> 8));
mapB.SampleGradient(colB,(in.b << 8) + ((in.b + 128) >> 8));
out.r = sMin(colR.r+colG.r+colB.r,65535);
out.g = sMin(colR.g+colG.g+colB.g,65535);
out.b = sMin(colR.b+colG.b+colB.b,65535);
out.a = in.a;
}
else if(in.a) // alpha!=0
{
Pixel colR,colG,colB;
sU32 invA = (65535U << 16) / in.a;
mapR.SampleGradient(colR,UMulShift8(sMin(in.r,in.a),invA));
mapG.SampleGradient(colG,UMulShift8(sMin(in.g,in.a),invA));
mapB.SampleGradient(colB,UMulShift8(sMin(in.b,in.a),invA));
out.r = MulIntens(sMin(colR.r+colG.r+colB.r,65535),in.a);
out.g = MulIntens(sMin(colR.g+colG.g+colB.g,65535),in.a);
out.b = MulIntens(sMin(colR.b+colG.b+colB.b,65535),in.a);
out.a = in.a;
}
else // alpha==0
out = in;
}
}
void GenTexture::CoordRemap(const GenTexture &in,const GenTexture &remapTex,sF32 strengthU,sF32 strengthV,sInt mode)
{
sVERIFY(SizeMatchesWith(remapTex));
const Pixel *remap = remapTex.Data;
Pixel *out = Data;
sInt u0 = MinX;
sInt v0 = MinY;
sInt scaleU = (1 << 24) * strengthU;
sInt scaleV = (1 << 24) * strengthV;
sInt stepU = 1 << (24 - ShiftX);
sInt stepV = 1 << (24 - ShiftY);
for(sInt y=0;y<YRes;y++)
{
sInt u = u0;
sInt v = v0;
for(sInt x=0;x<XRes;x++)
{
sInt dispU = u + MulShift16(scaleU,(remap->r - 32768) * 2);
sInt dispV = v + MulShift16(scaleV,(remap->g - 32768) * 2);
in.SampleFiltered(*out,dispU,dispV,mode);
u += stepU;
remap++;
out++;
}
v0 += stepV;
}
}
void GenTexture::Derive(const GenTexture &in,DeriveOp op,sF32 strength)
{
sVERIFY(SizeMatchesWith(in));
Pixel *out = Data;
for(sInt y=0;y<YRes;y++)
{
for(sInt x=0;x<XRes;x++)
{
sInt dx2 = in.Data[y*XRes + ((x+1) & (XRes-1))].r - in.Data[y*XRes + ((x-1) & (XRes-1))].r;
sInt dy2 = in.Data[x + ((y+1) & (YRes - 1)) * XRes].r - in.Data[x + ((y-1) & (YRes - 1)) * XRes].r;
sF32 dx = dx2 * strength / (2 * 65535.0f);
sF32 dy = dy2 * strength / (2 * 65535.0f);
switch(op)
{
case DeriveGradient:
out->r = sClamp<sInt>(dx*32768.0f + 32768.0f,0,65535);
out->g = sClamp<sInt>(dy*32768.0f + 32768.0f,0,65535);
out->b = 0;
out->a = 65535;
break;
case DeriveNormals:
{
// (1 0 dx)^T x (0 1 dy)^T = (-dx -dy 1)
sF32 scale = 32768.0f * sFInvSqrt(1.0f + dx*dx + dy*dy);
out->r = sClamp<sInt>(-dx*scale + 32768.0f,0,65535);
out->g = sClamp<sInt>(-dy*scale + 32768.0f,0,65535);
out->b = sClamp<sInt>( scale + 32768.0f,0,65535);
out->a = 65535;
}
break;
}
out++;
}
}
}
// Wrap computation on pixel coordinates
static sInt WrapCoord(sInt x,sInt width,sInt mode)
{
if(mode == 0) // wrap
return x & (width - 1);
else
return sClamp(x,0,width-1);
}
// Size is half of edge length in pixels, 26.6 fixed point
static void Blur1DBuffer(Pixel *dst,const Pixel *src,sInt width,sInt sizeFixed,sInt wrapMode)
{
sVERIFY(sizeFixed > 32); // kernel should be wider than one pixel
sInt frac = (sizeFixed - 32) & 63;
sInt offset = (sizeFixed + 32) >> 6;
sVERIFY(((offset - 1) * 64 + frac + 32) == sizeFixed);
sU32 denom = sizeFixed * 2;
sU32 bias = denom / 2;
// initialize accumulators
sU32 accu[4];
if(wrapMode == 0) // wrap around
{
// leftmost and rightmost pixels (the partially covered ones)
sInt xl = WrapCoord(-offset,width,wrapMode);
sInt xr = WrapCoord(offset,width,wrapMode);
accu[0] = frac * (src[xl].r + src[xr].r) + bias;
accu[1] = frac * (src[xl].g + src[xr].g) + bias;
accu[2] = frac * (src[xl].b + src[xr].b) + bias;
accu[3] = frac * (src[xl].a + src[xr].a) + bias;
// inner part of filter kernel
for(sInt x=-offset+1;x<=offset-1;x++)
{
sInt xc = WrapCoord(x,width,wrapMode);
accu[0] += src[xc].r << 6;
accu[1] += src[xc].g << 6;
accu[2] += src[xc].b << 6;
accu[3] += src[xc].a << 6;
}
}
else // clamp on edge
{
// on the left edge, the first pixel is repeated over and over
accu[0] = src[0].r * (sizeFixed + 32) + bias;
accu[1] = src[0].g * (sizeFixed + 32) + bias;
accu[2] = src[0].b * (sizeFixed + 32) + bias;
accu[3] = src[0].a * (sizeFixed + 32) + bias;
// rightmost pixel
sInt xr = WrapCoord(offset,width,wrapMode);
accu[0] += frac * src[xr].r;
accu[1] += frac * src[xr].g;
accu[2] += frac * src[xr].b;
accu[3] += frac * src[xr].a;
// inner part of filter kernel (the right half)
for(sInt x=1;x<=offset-1;x++)
{
sInt xc = WrapCoord(x,width,wrapMode);
accu[0] += src[xc].r << 6;
accu[1] += src[xc].g << 6;
accu[2] += src[xc].b << 6;
accu[3] += src[xc].a << 6;
}
}
// generate output pixels
for(sInt x=0;x<width;x++)
{
// write out state of accumulator
dst[x].r = accu[0] / denom;
dst[x].g = accu[1] / denom;
dst[x].b = accu[2] / denom;
dst[x].a = accu[3] / denom;
// update accumulator
sInt xl0 = WrapCoord(x-offset+0,width,wrapMode);
sInt xl1 = WrapCoord(x-offset+1,width,wrapMode);
sInt xr0 = WrapCoord(x+offset+0,width,wrapMode);
sInt xr1 = WrapCoord(x+offset+1,width,wrapMode);
accu[0] += 64 * (src[xr0].r - src[xl1].r) + frac * (src[xr1].r - src[xr0].r - src[xl0].r + src[xl1].r);
accu[1] += 64 * (src[xr0].g - src[xl1].g) + frac * (src[xr1].g - src[xr0].g - src[xl0].g + src[xl1].g);
accu[2] += 64 * (src[xr0].b - src[xl1].b) + frac * (src[xr1].b - src[xr0].b - src[xl0].b + src[xl1].b);
accu[3] += 64 * (src[xr0].a - src[xl1].a) + frac * (src[xr1].a - src[xr0].a - src[xl0].a + src[xl1].a);
}
}
void GenTexture::Blur(const GenTexture &inImg,sF32 sizex,sF32 sizey,sInt order,sInt wrapMode)
{
sVERIFY(SizeMatchesWith(inImg));
sInt sizePixX = sClamp(sizex,0.0f,1.0f) * 64 * inImg.XRes / 2;
sInt sizePixY = sClamp(sizey,0.0f,1.0f) * 64 * inImg.YRes / 2;