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#include <vd2/system/math.h>
#include <vd2/system/vdstl.h>
#include <vd2/Kasumi/resample_kernels.h>
#include "resample_stages.h"
VDSteppedAllocator::VDSteppedAllocator(size_t initialSize)
: mpHead(NULL)
, mpAllocNext(NULL)
, mAllocLeft(0)
, mAllocNext(initialSize)
, mAllocInit(initialSize)
{
}
VDSteppedAllocator::~VDSteppedAllocator() {
clear();
}
void VDSteppedAllocator::clear() {
while(Block *p = mpHead) {
mpHead = mpHead->next;
free(p);
}
mAllocLeft = 0;
mAllocNext = mAllocInit;
}
void *VDSteppedAllocator::allocate(size_type n) {
n = (n+15) & ~15;
if (mAllocLeft < n) {
mAllocLeft = mAllocNext;
mAllocNext += (mAllocNext >> 1);
if (mAllocLeft < n)
mAllocLeft = n;
Block *t = (Block *)malloc(sizeof(Block) + mAllocLeft);
if (mpHead)
mpHead->next = t;
mpHead = t;
mpHead->next = NULL;
mpAllocNext = (char *)(mpHead + 1);
}
void *p = mpAllocNext;
mpAllocNext += n;
mAllocLeft -= n;
return p;
}
void VDResamplerGenerateTable(sint32 *dst, const IVDResamplerFilter& filter) {
const unsigned width = filter.GetFilterWidth();
vdblock<float> filters(width * 256);
float *src = filters.data();
filter.GenerateFilterBank(src);
for(unsigned phase=0; phase < 256; ++phase) {
float sum = 0;
for(unsigned i=0; i<width; ++i)
sum += src[i];
float scalefac = 16384.0f / sum;
for(unsigned j=0; j<width; j += 2) {
int v0 = VDRoundToIntFast(src[j+0] * scalefac);
int v1 = VDRoundToIntFast(src[j+1] * scalefac);
dst[j+0] = v0;
dst[j+1] = v1;
}
src += width;
dst += width;
}
}
void VDResamplerGenerateTableF(float *dst, const IVDResamplerFilter& filter) {
const unsigned width = filter.GetFilterWidth();
filter.GenerateFilterBank(dst);
for(unsigned phase=0; phase < 256; ++phase) {
float sum = 0;
for(unsigned i=0; i<width; ++i)
sum += dst[i];
float scalefac = 1.0f / sum;
for(unsigned j=0; j<width; ++j)
*dst++ *= scalefac;
}
}
void VDResamplerGenerateTable2(sint32 *dst, const IVDResamplerFilter& filter, sint32 count, sint32 u0, sint32 dudx) {
const unsigned width = filter.GetFilterWidth();
vdblock<float> filters(width);
float *src = filters.data();
filter.GenerateFilterBank(src);
for(sint32 i=0; i<count; ++i) {
sint32 u = u0 + dudx*i;
*dst++ = u >> 16;
filter.GenerateFilter(src, (double)(u & 0xffff) / 65536.0);
float sum = 0;
for(uint32 j=0; j<width; ++j)
sum += src[j];
float scalefac = 16384.0f / sum;
sint32 isum = 0;
for(uint32 j=0; j<width; ++j) {
sint32 v = VDRoundToIntFast(src[j] * scalefac);
dst[j] = v;
isum += v;
}
sint32 ierr = 16384 - isum;
sint32 idelta = 2*(ierr >> 31) - 1;
while(ierr) {
for(uint32 j=0; j<width && ierr; ++j) {
if (!dst[j])
continue;
dst[j] += idelta;
ierr -= idelta;
}
}
dst += width;
}
}
void VDResamplerSwizzleTable(sint32 *dst, unsigned pairs) {
do {
sint32 v0 = dst[0];
sint32 v1 = dst[1];
dst[0] = dst[1] = (v0 & 0xffff) + (v1<<16);
dst += 2;
} while(--pairs);
}
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