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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "LegacyAtlasAlloc.h"
#include <vector>
#include <list>
// texture spacing in the atlas (in pixels)
#define TEXMARGIN 2
inline int CLegacyAtlasAlloc::CompareTex(SAtlasEntry* tex1, SAtlasEntry* tex2)
{
// sort in reverse order
if ((tex1)->size.y == (tex2)->size.y) {
return ((tex1)->size.x > (tex2)->size.x);
}
return ((tex1)->size.y > (tex2)->size.y);
}
bool CLegacyAtlasAlloc::IncreaseSize()
{
if (atlasSize.y < atlasSize.x) {
if ((atlasSize.y * 2) <= maxsize.y) {
atlasSize.y *= 2;
return true;
}
if ((atlasSize.x * 2) <= maxsize.x) {
atlasSize.x *= 2;
return true;
}
} else {
if ((atlasSize.x * 2) <= maxsize.x) {
atlasSize.x *= 2;
return true;
}
if ((atlasSize.y * 2) <= maxsize.y) {
atlasSize.y *= 2;
return true;
}
}
return false;
}
bool CLegacyAtlasAlloc::Allocate()
{
atlasSize.x = 32;
atlasSize.y = 32;
std::vector<SAtlasEntry*> memtextures;
for (std::map<std::string, SAtlasEntry>::iterator it = entries.begin(); it != entries.end(); ++it) {
memtextures.push_back(&it->second);
}
sort(memtextures.begin(), memtextures.end(), CLegacyAtlasAlloc::CompareTex);
bool success = true;
int2 max;
int2 cur;
std::list<int2> nextSub;
std::list<int2> thisSub;
bool recalc = false;
for (int a = 0; a < static_cast<int>(memtextures.size()); ++a) {
SAtlasEntry* curtex = memtextures[a];
bool done = false;
while (!done) {
if (thisSub.empty()) {
if (nextSub.empty()) {
cur.y = max.y;
max.y += curtex->size.y + TEXMARGIN;
if (max.y > atlasSize.y) {
if (IncreaseSize()) {
nextSub.clear();
thisSub.clear();
cur.y = max.y = cur.x = 0;
recalc = true;
break;
} else {
success = false;
break;
}
}
thisSub.push_back(int2(0, cur.y));
} else {
thisSub = nextSub;
nextSub.clear();
}
}
if ((thisSub.front().x + curtex->size.x + TEXMARGIN) > atlasSize.x) {
thisSub.clear();
continue;
}
if (thisSub.front().y + curtex->size.y > max.y) {
thisSub.pop_front();
continue;
}
// found space in both dimensions s.t. texture
// PLUS margin fits within current atlas bounds
curtex->texCoords.x1 = thisSub.front().x;
curtex->texCoords.y1 = thisSub.front().y;
curtex->texCoords.x2 = thisSub.front().x + curtex->size.x - 1;
curtex->texCoords.y2 = thisSub.front().y + curtex->size.y - 1;
cur.x = thisSub.front().x + curtex->size.x + TEXMARGIN;
max.x = std::max(max.x, cur.x);
done = true;
if ((thisSub.front().y + curtex->size.y + TEXMARGIN) < max.y) {
nextSub.push_back(int2(thisSub.front().x + TEXMARGIN, thisSub.front().y + curtex->size.y + TEXMARGIN));
}
thisSub.front().x += (curtex->size.x + TEXMARGIN);
while (thisSub.size()>1 && thisSub.front().x >= (++thisSub.begin())->x) {
(++thisSub.begin())->x = thisSub.front().x;
thisSub.erase(thisSub.begin());
}
}
if (recalc) {
// reset all existing texcoords
for (std::vector<SAtlasEntry*>::iterator it = memtextures.begin(); it != memtextures.end(); ++it) {
(*it)->texCoords = float4();
}
recalc = false;
a = -1;
continue;
}
}
if (npot) {
atlasSize = max;
}
return success;
}
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