public Quantizer(MultiDimFloatTexture tex, int qbits, float percent)
{
Globals.Assert(percent > 0.0f && percent <= 100.0f);
ScopeTimer tm = new ScopeTimer("[Quantizer]");
m_Texture = tex;
m_Quantized = new MultiDimIntTexture(tex.width(), tex.height(), tex.numComp());
m_iQBits = qbits;
m_Mean = new float[tex.numComp()];
m_StdDev = new float[tex.numComp()];
m_Center = new float[tex.numComp()];
m_Radius = new float[tex.numComp()];
// . compute std dev and mean of every components
float [] sum = new float[tex.numComp()];
float [] sumsq = new float[tex.numComp()];
for (int j = 0; j < tex.height(); j++)
{
for (int i = 0; i < tex.width(); i++)
{
for (int c = 0; c < tex.numComp(); c++)
{
float f = tex.get(i, j, c);
sum[c] += f;
sumsq[c] += f * f;
}
}
}
float num = (float)(tex.width() * tex.height());
for (int c = 0; c < tex.numComp(); c++)
{
m_Mean[c] = sum[c] / num;
float sqstddev = (sumsq[c] - sum[c] * sum[c] / num) / (num - 1.0f);
if (sqstddev > BMathLib.cFloatCompareEpsilon)
{
m_StdDev[c] = (float)Math.Sqrt(sqstddev);
}
else
{
m_StdDev[c] = 0.0f;
}
}
// . for every component
// compute center and radius so that 'percent' samples are within quantization space
for (int c = 0; c < tex.numComp(); c++)
{
float [] samples = new float[tex.width() * tex.height()];
// add samples to array
for (int j = 0; j < tex.height(); j++)
{
for (int i = 0; i < tex.width(); i++)
{
samples[i + j * tex.width()] = tex.get(i, j, c);
}
}
// sort array
Sort.RadixSort rs = new Sort.RadixSort();
rs.Sort(samples);//sort(samples.begin(),samples.end());
// find left and right elements so that 'percent' elements are inside
float pout = ((100.0f - percent) / 2) / 100.0f;
int left = (int)((samples.Length - 1) * pout);
int right = (int)((samples.Length - 1) * (1.0f - pout));
m_Center[c] = (samples[right] + samples[left]) / 2.0f;
m_Radius[c] = samples[right] - samples[left];
}
// . quantize
int num_outside = 0;
for (int j = 0; j < tex.height(); j++)
{
for (int i = 0; i < tex.width(); i++)
{
if (!quantizePixel(tex.numComp(), tex, tex.getpixIndex(i, j), m_Quantized.getpixIndex(i, j)))
{
num_outside++;
}
}
}
float percent_out = num_outside * 100.0f / (tex.width() * tex.height());
if (Globals.PRINT_DEBUG_MSG)
{
Debug.Print("-----------.>> Quantizer: num outside = " + percent_out + "%");
}
tm.destroy();
tm = null;
}
int computeStackLevels_Box(MultiDimFloatTexture tex, ref MultiDimFloatTexture[] _lvls)
{
List <MultiDimFloatTexture> tmplvls = new List <MultiDimFloatTexture>();
// compute stack of averages on large texture
// . add unmodifed finest level
tmplvls.Clear();
tmplvls.Add(tex);
int l = 0;
MultiDimFloatTexture lvl = tex;
float [] lvlDat = lvl.getData();
int num = (int)(0.01 + BMathLib.log2((float)lvl.getWidth()));
do // TODO: speed this up - extremely unefficient !!! (not critical though)
{
stack_accessor_v2 access = new stack_accessor_v2(l); // l is destination level for children
// (children *are* at level l)
MultiDimFloatTexture stackl = new MultiDimFloatTexture(lvl.getWidth(), lvl.getHeight(), lvl.numComp());
List <float> avg = new List <float>();
for (int q = 0; q < lvl.numComp(); q++)
{
avg.Add(0);
}
for (int i = 0; i < stackl.getWidth(); i++)
{
for (int j = 0; j < stackl.getHeight(); j++)
{
for (int q = 0; q < avg.Count; q++)
{
avg[q] = 0;
}
for (int li = 0; li < 2; li++)
{
for (int lj = 0; lj < 2; lj++)
{
int ci = 0, cj = 0;
access.child_ij(i, j, li, lj, ref ci, ref cj);
//CLM large amount of modification here.. check back w/ origional if problems occur
if (ci < 0 || ci >= lvl.getWidth() ||
cj < 0 || cj >= lvl.getHeight())
{
continue;
}
int idx = lvl.getpixmodIndex(ci, cj);
for (int c = 0; c < stackl.numComp(); c++)
{
avg[c] += lvlDat[idx + c];
}
}
}
int opix = stackl.getpixIndex(i, j);
for (int c = 0; c < stackl.numComp(); c++)
{
stackl.getData()[opix + c] = avg[c] / 4.0f;
}
}
}
lvl = stackl;
tmplvls.Add(lvl);
l++;
} while ((1 << l) <= lvl.getWidth());
// clamp stack
int w = tex.getWidth() / 2;
int h = tex.getHeight() / 2;
_lvls = new MultiDimFloatTexture[m_iNbLevels];
l = 0;
int sz = w;
for (int i = 0; i < tmplvls.Count; i++)
{
MultiDimFloatTexture ktex = tmplvls[i];
MultiDimFloatTexture clamped = ktex.extract(w / 2, h / 2, w, h);
_lvls[i] = clamped;
l++;
sz >>= 1;
if (sz < 1)
{
break;
}
}
for (int i = 0; i < tmplvls.Count; i++)
{
tmplvls[i] = null;
}
tmplvls.Clear();
return((int)_lvls.Length);
}
