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TextureAtlas.cpp
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TextureAtlas.cpp
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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "TextureAtlas.h"
#include "Bitmap.h"
#include "LegacyAtlasAlloc.h"
#include "QuadtreeAtlasAlloc.h"
#include "Rendering/GlobalRendering.h"
#include "Rendering/GL/myGL.h"
#include "Rendering/GL/PBO.h"
#include "System/Config/ConfigHandler.h"
#include "System/Log/ILog.h"
#include "System/StringUtil.h"
#include "System/Exceptions.h"
#include <cstring>
CONFIG(int, MaxTextureAtlasSizeX).defaultValue(2048).minimumValue(512).maximumValue(32768);
CONFIG(int, MaxTextureAtlasSizeY).defaultValue(2048).minimumValue(512).maximumValue(32768);
CR_BIND(AtlasedTexture, )
CR_REG_METADATA(AtlasedTexture, (CR_MEMBER(x), CR_MEMBER(y), CR_MEMBER(z), CR_MEMBER(w)))
static AtlasedTexture dummy;
bool CTextureAtlas::debug = false;
CTextureAtlas::CTextureAtlas(unsigned int allocType)
{
switch (allocType) {
case ATLAS_ALLOC_LEGACY : { atlasAllocator = new CLegacyAtlasAlloc(); } break;
case ATLAS_ALLOC_QUADTREE: { atlasAllocator = new CQuadtreeAtlasAlloc(); } break;
default : { assert(false); } break;
}
// NB: maxTextureSize can be as large as 32768, resulting in a 4GB atlas
const int atlasSizeX = std::min(globalRendering->maxTextureSize, configHandler->GetInt("MaxTextureAtlasSizeX"));
const int atlasSizeY = std::min(globalRendering->maxTextureSize, configHandler->GetInt("MaxTextureAtlasSizeY"));
atlasAllocator->SetNonPowerOfTwo(globalRendering->supportNonPowerOfTwoTex);
atlasAllocator->SetMaxSize(atlasSizeX, atlasSizeY);
textures.reserve(256);
memTextures.reserve(128);
}
CTextureAtlas::~CTextureAtlas()
{
if (freeTexture)
glDeleteTextures(1, &atlasTexID);
delete atlasAllocator;
}
size_t CTextureAtlas::AddTex(std::string name, int xsize, int ysize, TextureType texType)
{
memTextures.emplace_back();
MemTex& tex = memTextures.back();
tex.xsize = xsize;
tex.ysize = ysize;
tex.texType = texType;
tex.mem.resize((xsize * ysize * GetBPP(texType)) / 8, 0);
StringToLowerInPlace(name);
tex.names.emplace_back(std::move(name));
atlasAllocator->AddEntry(tex.names.back(), int2(xsize, ysize));
return (memTextures.size() - 1);
}
size_t CTextureAtlas::AddTexFromMem(std::string name, int xsize, int ysize, TextureType texType, void* data)
{
const size_t texIdx = AddTex(std::move(name), xsize, ysize, texType);
MemTex& tex = memTextures[texIdx];
std::memcpy(tex.mem.data(), data, tex.mem.size());
return texIdx;
}
size_t CTextureAtlas::AddTexFromFile(std::string name, std::string file)
{
StringToLowerInPlace(name);
// if the file is already loaded, use that instead
const std::string& lcFile = StringToLower(file);
const auto it = files.find(lcFile);
if (it != files.end()) {
memTextures[it->second].names.emplace_back(std::move(name));
return (it->second);
}
CBitmap bitmap;
if (!bitmap.Load(file)) {
bitmap.Alloc(2, 2, 4);
LOG_L(L_WARNING, "[TexAtlas::%s] could not load texture from file \"%s\"", __func__, file.c_str());
}
// only suport RGBA for now
if (bitmap.channels != 4 || bitmap.compressed)
throw content_error("Unsupported bitmap format in file " + file);
return (files[lcFile] = AddTexFromMem(std::move(name), bitmap.xsize, bitmap.ysize, RGBA32, bitmap.GetRawMem()));
}
bool CTextureAtlas::Finalize()
{
const bool success = atlasAllocator->Allocate() && (initialized = CreateTexture());
memTextures.clear();
files.clear();
return success;
}
bool CTextureAtlas::CreateTexture()
{
const int2 atlasSize = atlasAllocator->GetAtlasSize();
const int maxMipMaps = atlasAllocator->GetMaxMipMaps();
// ATI drivers like to *crash* in glTexImage if x=0 or y=0
if (atlasSize.x <= 0 || atlasSize.y <= 0) {
LOG_L(L_ERROR, "[TextureAtlas::%s] bad allocation for atlas \"%s\" (size=<%d,%d>)", __func__, name.c_str(), atlasSize.x, atlasSize.y);
return false;
}
PBO pbo;
pbo.Bind();
pbo.New(atlasSize.x * atlasSize.y * 4);
unsigned char* data = reinterpret_cast<unsigned char*>(pbo.MapBuffer(GL_WRITE_ONLY));
if (data != nullptr) {
// make spacing between textures black transparent to avoid ugly lines with linear filtering
std::memset(data, 0, atlasSize.x * atlasSize.y * 4);
for (const MemTex& memTex: memTextures) {
const float4 texCoords = atlasAllocator->GetTexCoords(memTex.names[0]);
const float4 absCoords = atlasAllocator->GetEntry(memTex.names[0]);
const int xpos = absCoords.x;
const int ypos = absCoords.y;
const AtlasedTexture tex(texCoords);
for (const auto& name: memTex.names) {
textures[name] = tex;
}
for (int y = 0; y < memTex.ysize; ++y) {
int* dst = ((int*) data ) + xpos + (ypos + y) * atlasSize.x;
int* src = ((int*)memTex.mem.data()) + ( y) * memTex.xsize;
memcpy(dst, src, memTex.xsize * 4);
}
}
if (debug) {
CBitmap tex(data, atlasSize.x, atlasSize.y);
tex.Save(name + "-" + IntToString(atlasSize.x) + "x" + IntToString(atlasSize.y) + ".png");
}
} else {
LOG_L(L_ERROR, "[TextureAtlas::%s] failed to map PBO for atlas \"%s\" (size=<%d,%d>)", __func__, name.c_str(), atlasSize.x, atlasSize.y);
}
pbo.UnmapBuffer();
glGenTextures(1, &atlasTexID);
glBindTexture(GL_TEXTURE_2D, atlasTexID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (maxMipMaps > 0) ? GL_LINEAR_MIPMAP_NEAREST : GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, maxMipMaps);
if (maxMipMaps > 0) {
glBuildMipmaps(GL_TEXTURE_2D, GL_RGBA8, atlasSize.x, atlasSize.y, GL_RGBA, GL_UNSIGNED_BYTE, pbo.GetPtr()); //FIXME disable texcompression, PBO
} else {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, atlasSize.x, atlasSize.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, pbo.GetPtr());
}
pbo.Invalidate();
pbo.Unbind();
return (data != nullptr);
}
void CTextureAtlas::BindTexture()
{
glBindTexture(GL_TEXTURE_2D, atlasTexID);
}
bool CTextureAtlas::TextureExists(const std::string& name)
{
return (textures.find(StringToLower(name)) != textures.end());
}
AtlasedTexture& CTextureAtlas::GetTexture(const std::string& name)
{
if (TextureExists(name))
return textures[StringToLower(name)];
return dummy;
}
AtlasedTexture& CTextureAtlas::GetTextureWithBackup(const std::string& name, const std::string& backupName)
{
if (TextureExists(name))
return textures[StringToLower(name)];
if (TextureExists(backupName))
return textures[StringToLower(backupName)];
return dummy;
}
int2 CTextureAtlas::GetSize() const {
return (atlasAllocator->GetAtlasSize());
}