408 lines
12 KiB
C++
408 lines
12 KiB
C++
/*
|
|
* Copyright 2011, Blender Foundation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* Contributor:
|
|
* Jeroen Bakker
|
|
* Monique Dewanchand
|
|
*/
|
|
|
|
#include "COM_GlareFogGlowOperation.h"
|
|
#include "MEM_guardedalloc.h"
|
|
|
|
/*
|
|
* 2D Fast Hartley Transform, used for convolution
|
|
*/
|
|
|
|
typedef float fREAL;
|
|
|
|
// returns next highest power of 2 of x, as well it's log2 in L2
|
|
static unsigned int nextPow2(unsigned int x, unsigned int *L2)
|
|
{
|
|
unsigned int pw, x_notpow2 = x & (x - 1);
|
|
*L2 = 0;
|
|
while (x >>= 1) ++(*L2);
|
|
pw = 1 << (*L2);
|
|
if (x_notpow2) { (*L2)++; pw <<= 1; }
|
|
return pw;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// from FXT library by Joerg Arndt, faster in order bitreversal
|
|
// use: r = revbin_upd(r, h) where h = N>>1
|
|
static unsigned int revbin_upd(unsigned int r, unsigned int h)
|
|
{
|
|
while (!((r ^= h) & h)) h >>= 1;
|
|
return r;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
static void FHT(fREAL *data, unsigned int M, unsigned int inverse)
|
|
{
|
|
double tt, fc, dc, fs, ds, a = M_PI;
|
|
fREAL t1, t2;
|
|
int n2, bd, bl, istep, k, len = 1 << M, n = 1;
|
|
|
|
int i, j = 0;
|
|
unsigned int Nh = len >> 1;
|
|
for (i = 1; i < (len - 1); ++i) {
|
|
j = revbin_upd(j, Nh);
|
|
if (j > i) {
|
|
t1 = data[i];
|
|
data[i] = data[j];
|
|
data[j] = t1;
|
|
}
|
|
}
|
|
|
|
do {
|
|
fREAL *data_n = &data[n];
|
|
|
|
istep = n << 1;
|
|
for (k = 0; k < len; k += istep) {
|
|
t1 = data_n[k];
|
|
data_n[k] = data[k] - t1;
|
|
data[k] += t1;
|
|
}
|
|
|
|
n2 = n >> 1;
|
|
if (n > 2) {
|
|
fc = dc = cos(a);
|
|
fs = ds = sqrt(1.0 - fc * fc); //sin(a);
|
|
bd = n - 2;
|
|
for (bl = 1; bl < n2; bl++) {
|
|
fREAL *data_nbd = &data_n[bd];
|
|
fREAL *data_bd = &data[bd];
|
|
for (k = bl; k < len; k += istep) {
|
|
t1 = fc * (double)data_n[k] + fs * (double)data_nbd[k];
|
|
t2 = fs * (double)data_n[k] - fc * (double)data_nbd[k];
|
|
data_n[k] = data[k] - t1;
|
|
data_nbd[k] = data_bd[k] - t2;
|
|
data[k] += t1;
|
|
data_bd[k] += t2;
|
|
}
|
|
tt = fc * dc - fs * ds;
|
|
fs = fs * dc + fc * ds;
|
|
fc = tt;
|
|
bd -= 2;
|
|
}
|
|
}
|
|
|
|
if (n > 1) {
|
|
for (k = n2; k < len; k += istep) {
|
|
t1 = data_n[k];
|
|
data_n[k] = data[k] - t1;
|
|
data[k] += t1;
|
|
}
|
|
}
|
|
|
|
n = istep;
|
|
a *= 0.5;
|
|
} while (n < len);
|
|
|
|
if (inverse) {
|
|
fREAL sc = (fREAL)1 / (fREAL)len;
|
|
for (k = 0; k < len; ++k)
|
|
data[k] *= sc;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
/* 2D Fast Hartley Transform, Mx/My -> log2 of width/height,
|
|
* nzp -> the row where zero pad data starts,
|
|
* inverse -> see above */
|
|
static void FHT2D(fREAL *data, unsigned int Mx, unsigned int My,
|
|
unsigned int nzp, unsigned int inverse)
|
|
{
|
|
unsigned int i, j, Nx, Ny, maxy;
|
|
|
|
Nx = 1 << Mx;
|
|
Ny = 1 << My;
|
|
|
|
// rows (forward transform skips 0 pad data)
|
|
maxy = inverse ? Ny : nzp;
|
|
for (j = 0; j < maxy; ++j)
|
|
FHT(&data[Nx * j], Mx, inverse);
|
|
|
|
// transpose data
|
|
if (Nx == Ny) { // square
|
|
for (j = 0; j < Ny; ++j)
|
|
for (i = j + 1; i < Nx; ++i) {
|
|
unsigned int op = i + (j << Mx), np = j + (i << My);
|
|
SWAP(fREAL, data[op], data[np]);
|
|
}
|
|
}
|
|
else { // rectangular
|
|
unsigned int k, Nym = Ny - 1, stm = 1 << (Mx + My);
|
|
for (i = 0; stm > 0; i++) {
|
|
#define PRED(k) (((k & Nym) << Mx) + (k >> My))
|
|
for (j = PRED(i); j > i; j = PRED(j)) ;
|
|
if (j < i) continue;
|
|
for (k = i, j = PRED(i); j != i; k = j, j = PRED(j), stm--) {
|
|
SWAP(fREAL, data[j], data[k]);
|
|
}
|
|
#undef PRED
|
|
stm--;
|
|
}
|
|
}
|
|
|
|
SWAP(unsigned int, Nx, Ny);
|
|
SWAP(unsigned int, Mx, My);
|
|
|
|
// now columns == transposed rows
|
|
for (j = 0; j < Ny; ++j)
|
|
FHT(&data[Nx * j], Mx, inverse);
|
|
|
|
// finalize
|
|
for (j = 0; j <= (Ny >> 1); j++) {
|
|
unsigned int jm = (Ny - j) & (Ny - 1);
|
|
unsigned int ji = j << Mx;
|
|
unsigned int jmi = jm << Mx;
|
|
for (i = 0; i <= (Nx >> 1); i++) {
|
|
unsigned int im = (Nx - i) & (Nx - 1);
|
|
fREAL A = data[ji + i];
|
|
fREAL B = data[jmi + i];
|
|
fREAL C = data[ji + im];
|
|
fREAL D = data[jmi + im];
|
|
fREAL E = (fREAL)0.5 * ((A + D) - (B + C));
|
|
data[ji + i] = A - E;
|
|
data[jmi + i] = B + E;
|
|
data[ji + im] = C + E;
|
|
data[jmi + im] = D - E;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
/* 2D convolution calc, d1 *= d2, M/N - > log2 of width/height */
|
|
static void fht_convolve(fREAL *d1, fREAL *d2, unsigned int M, unsigned int N)
|
|
{
|
|
fREAL a, b;
|
|
unsigned int i, j, k, L, mj, mL;
|
|
unsigned int m = 1 << M, n = 1 << N;
|
|
unsigned int m2 = 1 << (M - 1), n2 = 1 << (N - 1);
|
|
unsigned int mn2 = m << (N - 1);
|
|
|
|
d1[0] *= d2[0];
|
|
d1[mn2] *= d2[mn2];
|
|
d1[m2] *= d2[m2];
|
|
d1[m2 + mn2] *= d2[m2 + mn2];
|
|
for (i = 1; i < m2; i++) {
|
|
k = m - i;
|
|
a = d1[i] * d2[i] - d1[k] * d2[k];
|
|
b = d1[k] * d2[i] + d1[i] * d2[k];
|
|
d1[i] = (b + a) * (fREAL)0.5;
|
|
d1[k] = (b - a) * (fREAL)0.5;
|
|
a = d1[i + mn2] * d2[i + mn2] - d1[k + mn2] * d2[k + mn2];
|
|
b = d1[k + mn2] * d2[i + mn2] + d1[i + mn2] * d2[k + mn2];
|
|
d1[i + mn2] = (b + a) * (fREAL)0.5;
|
|
d1[k + mn2] = (b - a) * (fREAL)0.5;
|
|
}
|
|
for (j = 1; j < n2; j++) {
|
|
L = n - j;
|
|
mj = j << M;
|
|
mL = L << M;
|
|
a = d1[mj] * d2[mj] - d1[mL] * d2[mL];
|
|
b = d1[mL] * d2[mj] + d1[mj] * d2[mL];
|
|
d1[mj] = (b + a) * (fREAL)0.5;
|
|
d1[mL] = (b - a) * (fREAL)0.5;
|
|
a = d1[m2 + mj] * d2[m2 + mj] - d1[m2 + mL] * d2[m2 + mL];
|
|
b = d1[m2 + mL] * d2[m2 + mj] + d1[m2 + mj] * d2[m2 + mL];
|
|
d1[m2 + mj] = (b + a) * (fREAL)0.5;
|
|
d1[m2 + mL] = (b - a) * (fREAL)0.5;
|
|
}
|
|
for (i = 1; i < m2; i++) {
|
|
k = m - i;
|
|
for (j = 1; j < n2; j++) {
|
|
L = n - j;
|
|
mj = j << M;
|
|
mL = L << M;
|
|
a = d1[i + mj] * d2[i + mj] - d1[k + mL] * d2[k + mL];
|
|
b = d1[k + mL] * d2[i + mj] + d1[i + mj] * d2[k + mL];
|
|
d1[i + mj] = (b + a) * (fREAL)0.5;
|
|
d1[k + mL] = (b - a) * (fREAL)0.5;
|
|
a = d1[i + mL] * d2[i + mL] - d1[k + mj] * d2[k + mj];
|
|
b = d1[k + mj] * d2[i + mL] + d1[i + mL] * d2[k + mj];
|
|
d1[i + mL] = (b + a) * (fREAL)0.5;
|
|
d1[k + mj] = (b - a) * (fREAL)0.5;
|
|
}
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
static void convolve(float *dst, MemoryBuffer *in1, MemoryBuffer *in2)
|
|
{
|
|
fREAL *data1, *data2, *fp;
|
|
unsigned int w2, h2, hw, hh, log2_w, log2_h;
|
|
fRGB wt, *colp;
|
|
int x, y, ch;
|
|
int xbl, ybl, nxb, nyb, xbsz, ybsz;
|
|
bool in2done = false;
|
|
const unsigned int kernelWidth = in2->getWidth();
|
|
const unsigned int kernelHeight = in2->getHeight();
|
|
const unsigned int imageWidth = in1->getWidth();
|
|
const unsigned int imageHeight = in1->getHeight();
|
|
float *kernelBuffer = in2->getBuffer();
|
|
float *imageBuffer = in1->getBuffer();
|
|
|
|
MemoryBuffer *rdst = new MemoryBuffer(COM_DT_COLOR, in1->getRect());
|
|
memset(rdst->getBuffer(), 0, rdst->getWidth() * rdst->getHeight() * COM_NUM_CHANNELS_COLOR * sizeof(float));
|
|
|
|
// convolution result width & height
|
|
w2 = 2 * kernelWidth - 1;
|
|
h2 = 2 * kernelHeight - 1;
|
|
// FFT pow2 required size & log2
|
|
w2 = nextPow2(w2, &log2_w);
|
|
h2 = nextPow2(h2, &log2_h);
|
|
|
|
// alloc space
|
|
data1 = (fREAL *)MEM_callocN(3 * w2 * h2 * sizeof(fREAL), "convolve_fast FHT data1");
|
|
data2 = (fREAL *)MEM_callocN(w2 * h2 * sizeof(fREAL), "convolve_fast FHT data2");
|
|
|
|
// normalize convolutor
|
|
wt[0] = wt[1] = wt[2] = 0.0f;
|
|
for (y = 0; y < kernelHeight; y++) {
|
|
colp = (fRGB *)&kernelBuffer[y * kernelWidth * COM_NUM_CHANNELS_COLOR];
|
|
for (x = 0; x < kernelWidth; x++)
|
|
add_v3_v3(wt, colp[x]);
|
|
}
|
|
if (wt[0] != 0.0f) wt[0] = 1.0f / wt[0];
|
|
if (wt[1] != 0.0f) wt[1] = 1.0f / wt[1];
|
|
if (wt[2] != 0.0f) wt[2] = 1.0f / wt[2];
|
|
for (y = 0; y < kernelHeight; y++) {
|
|
colp = (fRGB *)&kernelBuffer[y * kernelWidth * COM_NUM_CHANNELS_COLOR];
|
|
for (x = 0; x < kernelWidth; x++)
|
|
mul_v3_v3(colp[x], wt);
|
|
}
|
|
|
|
// copy image data, unpacking interleaved RGBA into separate channels
|
|
// only need to calc data1 once
|
|
|
|
// block add-overlap
|
|
hw = kernelWidth >> 1;
|
|
hh = kernelHeight >> 1;
|
|
xbsz = (w2 + 1) - kernelWidth;
|
|
ybsz = (h2 + 1) - kernelHeight;
|
|
nxb = imageWidth / xbsz;
|
|
if (imageWidth % xbsz) nxb++;
|
|
nyb = imageHeight / ybsz;
|
|
if (imageHeight % ybsz) nyb++;
|
|
for (ybl = 0; ybl < nyb; ybl++) {
|
|
for (xbl = 0; xbl < nxb; xbl++) {
|
|
|
|
// each channel one by one
|
|
for (ch = 0; ch < 3; ch++) {
|
|
fREAL *data1ch = &data1[ch * w2 * h2];
|
|
|
|
// only need to calc fht data from in2 once, can re-use for every block
|
|
if (!in2done) {
|
|
// in2, channel ch -> data1
|
|
for (y = 0; y < kernelHeight; y++) {
|
|
fp = &data1ch[y * w2];
|
|
colp = (fRGB *)&kernelBuffer[y * kernelWidth * COM_NUM_CHANNELS_COLOR];
|
|
for (x = 0; x < kernelWidth; x++)
|
|
fp[x] = colp[x][ch];
|
|
}
|
|
}
|
|
|
|
// in1, channel ch -> data2
|
|
memset(data2, 0, w2 * h2 * sizeof(fREAL));
|
|
for (y = 0; y < ybsz; y++) {
|
|
int yy = ybl * ybsz + y;
|
|
if (yy >= imageHeight) continue;
|
|
fp = &data2[y * w2];
|
|
colp = (fRGB *)&imageBuffer[yy * imageWidth * COM_NUM_CHANNELS_COLOR];
|
|
for (x = 0; x < xbsz; x++) {
|
|
int xx = xbl * xbsz + x;
|
|
if (xx >= imageWidth) continue;
|
|
fp[x] = colp[xx][ch];
|
|
}
|
|
}
|
|
|
|
// forward FHT
|
|
// zero pad data start is different for each == height+1
|
|
if (!in2done) FHT2D(data1ch, log2_w, log2_h, kernelHeight + 1, 0);
|
|
FHT2D(data2, log2_w, log2_h, kernelHeight + 1, 0);
|
|
|
|
// FHT2D transposed data, row/col now swapped
|
|
// convolve & inverse FHT
|
|
fht_convolve(data2, data1ch, log2_h, log2_w);
|
|
FHT2D(data2, log2_h, log2_w, 0, 1);
|
|
// data again transposed, so in order again
|
|
|
|
// overlap-add result
|
|
for (y = 0; y < (int)h2; y++) {
|
|
const int yy = ybl * ybsz + y - hh;
|
|
if ((yy < 0) || (yy >= imageHeight)) continue;
|
|
fp = &data2[y * w2];
|
|
colp = (fRGB *)&rdst->getBuffer()[yy * imageWidth * COM_NUM_CHANNELS_COLOR];
|
|
for (x = 0; x < (int)w2; x++) {
|
|
const int xx = xbl * xbsz + x - hw;
|
|
if ((xx < 0) || (xx >= imageWidth)) continue;
|
|
colp[xx][ch] += fp[x];
|
|
}
|
|
}
|
|
|
|
}
|
|
in2done = true;
|
|
}
|
|
}
|
|
|
|
MEM_freeN(data2);
|
|
MEM_freeN(data1);
|
|
memcpy(dst, rdst->getBuffer(), sizeof(float) * imageWidth * imageHeight * COM_NUM_CHANNELS_COLOR);
|
|
delete(rdst);
|
|
}
|
|
|
|
void GlareFogGlowOperation::generateGlare(float *data, MemoryBuffer *inputTile, NodeGlare *settings)
|
|
{
|
|
int x, y;
|
|
float scale, u, v, r, w, d;
|
|
fRGB fcol;
|
|
MemoryBuffer *ckrn;
|
|
unsigned int sz = 1 << settings->size;
|
|
const float cs_r = 1.0f, cs_g = 1.0f, cs_b = 1.0f;
|
|
|
|
// temp. src image
|
|
// make the convolution kernel
|
|
rcti kernelRect;
|
|
BLI_rcti_init(&kernelRect, 0, sz, 0, sz);
|
|
ckrn = new MemoryBuffer(COM_DT_COLOR, &kernelRect);
|
|
|
|
scale = 0.25f * sqrtf((float)(sz * sz));
|
|
|
|
for (y = 0; y < sz; ++y) {
|
|
v = 2.0f * (y / (float)sz) - 1.0f;
|
|
for (x = 0; x < sz; ++x) {
|
|
u = 2.0f * (x / (float)sz) - 1.0f;
|
|
r = (u * u + v * v) * scale;
|
|
d = -sqrtf(sqrtf(sqrtf(r))) * 9.0f;
|
|
fcol[0] = expf(d * cs_r);
|
|
fcol[1] = expf(d * cs_g);
|
|
fcol[2] = expf(d * cs_b);
|
|
// linear window good enough here, visual result counts, not scientific analysis
|
|
//w = (1.0f-fabs(u))*(1.0f-fabs(v));
|
|
// actually, Hanning window is ok, cos^2 for some reason is slower
|
|
w = (0.5f + 0.5f * cosf(u * (float)M_PI)) * (0.5f + 0.5f * cosf(v * (float)M_PI));
|
|
mul_v3_fl(fcol, w);
|
|
ckrn->writePixel(x, y, fcol);
|
|
}
|
|
}
|
|
|
|
convolve(data, inputTile, ckrn);
|
|
delete ckrn;
|
|
}
|