COSC-3P98-Final-Project/include/world/chunk/world.h

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/*
* Created by Brett on 11/02/23.
* Licensed under GNU General Public License V3.0
* See LICENSE file for license detail
*/
#ifndef FINALPROJECT_WORLD_H
#define FINALPROJECT_WORLD_H
#include <world/chunk/storage.h>
#include <render/gl.h>
#include <unordered_map>
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#include "blt/profiling/profiler.h"
namespace fp {
namespace _static {
/**
* Converts from world coord to chunk-internal coords
* @param coord world space coordinate
* @return chunk internal coord
*/
static inline int world_to_internal(int coord) {
auto val = coord % CHUNK_SIZE;
return val < 0 ? CHUNK_SIZE + val : val;
}
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static inline block_pos world_to_internal(const block_pos& coord) {
return {world_to_internal(coord.x), world_to_internal(coord.y),
world_to_internal(coord.z)};
}
/**
* Converts from world coord to chunk pos coords
*
* consider: (int) (-31 / 32) which equals 0
* but a negative chunk would be stored at -1, not 0 (since that is taken by the positive coord chunk)
* an arithmetic right shift would produce the desired -1 (see Java, which performs a signed right bit shift)
* however in C++ shifting on a signed type is undefined behaviour. So we must emulate an arithmetic right shift.
*
* @param coord x,y, or z coordinate to convert
* @return a right arithmetic bit shift resulting in a signed division of the coordinate by CHUNK_SIZE
*/
static inline int world_to_chunk(int coord) {
auto ucoord = (unsigned int) coord;
ucoord >>= CHUNK_SHIFT;
if (coord < 0) {
// the mask only has to be generated once since it is never modified at runtime beyond assignment
static unsigned int mask = 0;
if (mask == 0) {
for (int i = 0; i < CHUNK_SHIFT; i++)
mask |= (1 << ((sizeof(int) * 8 - 1) - i));
}
ucoord |= mask;
}
return (int) (ucoord);
}
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static inline chunk_pos world_to_chunk(const block_pos& pos) {
return {world_to_chunk(pos.x), world_to_chunk(pos.y), world_to_chunk(pos.z)};
}
}
struct chunk {
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private:
block_storage* storage;
mesh_storage* mesh = nullptr;
VAO* chunk_vao;
chunk_pos pos;
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chunk_mesh_status dirtiness = OKAY;
chunk_update_status status = NONE;
unsigned long render_size = 0;
public:
explicit chunk(chunk_pos pos): pos(pos) {
storage = new block_storage();
chunk_vao = new VAO();
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auto vbo = new VBO(ARRAY_BUFFER, nullptr, 0);
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//auto data_size = 3 * sizeof(float) + 3 * sizeof(float);
//chunk_vao->bindVBO(vbo, 0, 3, GL_FLOAT, (int) data_size, 0);
//chunk_vao->bindVBO(vbo, 1, 3, GL_FLOAT, (int) data_size, 3 * sizeof(float), true);
chunk_vao->bindVBO(vbo, 0, 1, GL_FLOAT, sizeof(float), 0);
chunk_vao->bindElementVBO(new VBO(ELEMENT_BUFFER, nullptr, 0));
}
void render(shader& shader);
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void updateChunkMesh();
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/**
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* Mark the chunk as completely dirty and in need of a full chunk refresh
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*/
inline void markDirty() {
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dirtiness = DIRTY;
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}
/**
* Full chunk mesh is now completely generated and waiting on uploading to the GPU
*/
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inline void markRefresh() {
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dirtiness = REFRESH;
}
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[[nodiscard]] inline block_storage* getBlockStorage() {
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return storage;
}
[[nodiscard]] inline mesh_storage*& getMeshStorage() {
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return mesh;
}
[[nodiscard]] inline VAO*& getVAO() {
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return chunk_vao;
}
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[[nodiscard]] inline chunk_pos getPos() const {
return pos;
}
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[[nodiscard]] inline chunk_mesh_status getDirtiness() const {
return dirtiness;
}
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[[nodiscard]] inline chunk_update_status& getStatus() {
return status;
}
inline void setStatus(const chunk_update_status& new_status) {
status = new_status;
}
~chunk() {
delete storage;
delete chunk_vao;
delete mesh;
}
};
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struct chunk_neighbours {
fp::chunk* neighbours[6];
inline chunk*& operator[](int i) {
return neighbours[i];
}
};
class world {
private:
std::unordered_map<chunk_pos, chunk*, _static::chunk_pos_hash, _static::chunk_pos_equality> chunk_storage;
protected:
void generateChunkMesh(chunk* chunk);
chunk* generateChunk(const chunk_pos& pos);
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inline void getNeighbours(const chunk_pos& pos, chunk_neighbours& neighbours) {
neighbours[X_POS] = getChunk(chunk_pos{pos.x + 1, pos.y, pos.z});
neighbours[X_NEG] = getChunk(chunk_pos{pos.x - 1, pos.y, pos.z});
neighbours[Y_POS] = getChunk(chunk_pos{pos.x, pos.y + 1, pos.z});
neighbours[Y_NEG] = getChunk(chunk_pos{pos.x, pos.y - 1, pos.z});
neighbours[Z_POS] = getChunk(chunk_pos{pos.x, pos.y, pos.z + 1});
neighbours[Z_NEG] = getChunk(chunk_pos{pos.x, pos.y, pos.z - 1});
}
inline void insertChunk(chunk* chunk) {
if (chunk == nullptr)
return;
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chunk_storage.insert({chunk->getPos(), chunk});
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chunk_neighbours chunkNeighbours{};
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getNeighbours(chunk->getPos(), chunkNeighbours);
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for (auto* p : chunkNeighbours.neighbours) {
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if (p)
p->setStatus(NEIGHBOUR_CREATE);
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}
}
inline chunk* getChunk(const chunk_pos& pos) {
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const auto map_pos = chunk_storage.find(pos);
if (map_pos == chunk_storage.end())
return nullptr;
return map_pos->second;
}
inline chunk* getChunk(const block_pos& pos) {
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return chunk_storage[_static::world_to_chunk(pos)];
}
public:
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world() = default;
void update();
void render(fp::shader& shader);
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inline bool setBlock(const block_pos& pos, block_type blockID) {
auto c = getChunk(pos);
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if (!c)
return false;
// mark the chunk for a mesh update
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c->markDirty();
c->getBlockStorage()->set(_static::world_to_internal(pos), blockID);
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return true;
}
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inline block_type getBlock(const block_pos& pos) {
auto c = getChunk(pos);
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if (!c)
return fp::registry::AIR;
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return c->getBlockStorage()->get(_static::world_to_internal(pos));
}
~world() {
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BLT_PRINT_PROFILE("Chunk", blt::logging::TRACE, true);
for (auto& chunk : chunk_storage)
delete (chunk.second);
}
};
}
#endif //FINALPROJECT_WORLD_H