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#include "chunk.hpp"
namespace app {
//
// CHUNK CONSTRUCTORS AND DECONSTUCTORS
//
Chunk::Chunk(int32_t gridX, int32_t gridZ, uint32_t world_seed)
: world_seed{world_seed},
chunk_seed{(world_seed * gridX) + (world_seed * gridZ) / 2},
gridX{gridX},
gridZ{gridZ} {
chunkMesh = nullptr;
generate();
}
Chunk::~Chunk() {
if(chunkMesh != nullptr)
delete chunkMesh;
if(worker.joinable())
worker.join();
}
//
// CHUNK CREATION AND DELETION
//
static std::map<std::pair<int32_t, int32_t>, Chunk*> chunks{};
Chunk* Chunk::newChunk(int32_t gridX, int32_t gridZ, uint32_t world_seed) {
Chunk* chunk = new Chunk(gridX, gridZ, world_seed);
chunks[{gridX, gridZ}] = std::move(chunk);
return chunks[{gridX, gridZ}];
}
Chunk* Chunk::getChunk(int32_t gridX, int32_t gridZ) {
if(chunks.count({gridX, gridZ})) {
return chunks[{gridX, gridZ}];
} else {
return NULL;
}
}
//
// CHUNK TEXTURE AND BLOCK LOADING
//
static std::map<uint8_t, Block> blocks{};
static std::map<std::string, uint32_t> texturesIds{};
static std::vector<xe::Image*> textures{};
void loadTexture(const std::string& filePath) {
xe::Image* image = xe::Engine::getInstance()->loadImageFromFile(filePath, false);
texturesIds[filePath] = static_cast<uint32_t>(textures.size());
textures.push_back(image);
}
uint32_t getTexture(const std::string& filePath) {
return texturesIds[filePath];
}
std::vector<xe::Image*>& Chunk::getTextures() {
return textures;
}
void Chunk::load() {
loadTexture(DIRT_TEXTURE);
loadTexture(GRASS_TEXTURE);
loadTexture(GRASS_TOP_TEXTURE);
blocks[DIRT] = {{getTexture(DIRT_TEXTURE), getTexture(DIRT_TEXTURE), getTexture(DIRT_TEXTURE), getTexture(DIRT_TEXTURE), getTexture(DIRT_TEXTURE), getTexture(DIRT_TEXTURE)}};
blocks[GRASS] = {{getTexture(GRASS_TEXTURE), getTexture(GRASS_TEXTURE), getTexture(GRASS_TOP_TEXTURE), getTexture(DIRT_TEXTURE), getTexture(GRASS_TEXTURE), getTexture(GRASS_TEXTURE)}};
}
void Chunk::unload() {
for(const auto &image: textures) {
delete image;
}
for(const auto &[key, chunk]: chunks) {
delete chunk;
}
chunks.clear();
textures.clear();
}
//
// CHUNK MESH CREATION FOR BOTH SYNC AND ASYNC
//
void Chunk::createMeshAsync(Chunk* c) {
if(c->working) return;
c->worker = std::thread(createMesh, c);
}
void Chunk::createMesh(Chunk* c) {
c->working = true;
c->vertexData.data.clear();
for(int32_t x=0;x<16;x++) {
for(int32_t y=0; y<256; y++) {
for(int32_t z=0; z<16; z++) {
uint8_t block = c->getBlock(x,y,z);
if(block == AIR) continue;
if(c->getBlock(x+1,y,z) == AIR) {
c->addVerticies(c, 0, x, y, z, block);
}
if(c->getBlock(x-1,y,z) == AIR) {
c->addVerticies(c, 1, x, y, z, block);
}
if(c->getBlock(x,y+1,z) == AIR) {
c->addVerticies(c, 2, x, y, z, block);
}
if(c->getBlock(x,y-1,z) == AIR) {
c->addVerticies(c, 3, x, y, z, block);
}
if(c->getBlock(x,y,z+1) == AIR) {
c->addVerticies(c, 4, x, y, z, block);
}
if(c->getBlock(x,y,z-1) == AIR) {
c->addVerticies(c, 5, x, y, z, block);
}
}
}
}
c->working = false;
c->reloadRequired = true;
}
void Chunk::addVerticies(Chunk* c, uint8_t side, int32_t x, int32_t y, int32_t z, uint8_t block) {
for(int i = 0; i < 6; i ++) {
c->vertexData.write<float>(px[side * 6 + i][0] + x);
c->vertexData.write<float>(px[side * 6 + i][1] + y);
c->vertexData.write<float>(px[side * 6 + i][2] + z);
c->vertexData.write<float>(nm[side][0]);
c->vertexData.write<float>(nm[side][1]);
c->vertexData.write<float>(nm[side][2]);
c->vertexData.write<float>(uv[i][0]);
c->vertexData.write<float>(uv[i][1]);
c->vertexData.write<uint32_t>(static_cast<uint32_t>(blocks[block].textures[side]));
}
}
//
// CHUNK GETTERS AND SETTORS
//
xe::Model* Chunk::getMesh() {
if(reloadRequired) {
if(chunkMesh != nullptr)
delete chunkMesh;
if(worker.joinable())
worker.join();
xe::Model::Builder builder{};
builder.vertexData = vertexData;
builder.vertexSize = 36;
chunkMesh = new xe::Model(xe::Engine::getInstance()->getDevice(), builder);
reloadRequired = false;
}
return chunkMesh;
}
uint8_t Chunk::getBlock(int32_t x, int32_t y, int32_t z) {
if(y > 256) return AIR;
if(y < 0) return INVALID;
int chunkX = gridX;
int chunkZ = gridZ;
if(x < 0) {
chunkX--;
} else if(x > 15) {
chunkX++;
}
if(z < 0) {
chunkZ--;
} else if(z > 15) {
chunkZ++;
}
x = (x+16)%16;
z = (z+16)%16;
if(chunkX == gridX && chunkZ == gridZ) {
int index = x + (z * 16) + (y * 256);
return cubes[index];
} else {
Chunk* chunk = getChunk(chunkX, chunkZ);
if(chunk == NULL) {
return INVALID;
} else {
int index = x + (z * 16) + (y * 256);
return chunk->cubes[index];
}
}
}
void Chunk::setBlock(int32_t x, int32_t y, int32_t z, uint8_t block) {
int index = x + (z * 16) + (y * 256);
cubes[index] = block;
}
//
// CHUNK GENERATION
//
void Chunk::generate() {
cubes.resize(16*16*256);
const PerlinNoise perlin{world_seed};
for(int x = 0; x < 16; x++) {
for(int z = 0; z < 16; z++) {
int height = perlin.octave2D_01((( x + gridX * 16) * 0.01), ((z + gridZ * 16) * 0.01), 4) * 10;
for(int y = 0; y < 256; y++) {
if(y == height){
setBlock(x, y, z, GRASS);
} else if(y < height)
setBlock(x, y, z, DIRT);
else
setBlock(x, y, z, AIR);
}
}
}
}
}
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