cube-game-plus-plus/world/Chunk.cpp

#include "Chunk.h"
#include <cstdlib>
#include <cmath>

Chunk::Chunk(int chunkX, int chunkZ) : chunkX(chunkX), chunkZ(chunkZ)
{
    mesh = new ChunkMesh[HEIGHT_PARTIONS];
    for(int i = 0; i < HEIGHT_PARTIONS; i++)
    {
        dirty[i] = true;
    }
    for(int z = 0; z < DEPTH; z++)
    {
        for(int x = 0; x < WIDTH; x++)
        {
            int maxY = (int) (sin((x + chunkX * WIDTH) * 0.3) * 20 + 22) + (sin((z + chunkZ * DEPTH) * 0.3) * 20 + 22);
            if(maxY > HEIGHT)
            {
                maxY = HEIGHT;
            }
            
            for(int y = 0; y < maxY; y++)
            {
                blocks[y][x][z] = 1;
            }
            for(int y = maxY; y < HEIGHT; y++)
            {
                blocks[y][x][z] = 0;
            }
        }
    }
}

Chunk::~Chunk()
{
    delete[] mesh;
}

void Chunk::setBlock(int x, int y, int z, unsigned short block)
{
    blocks[y & BITMASK_HEIGHT][x & BITMASK_WIDTH][z & BITMASK_DEPTH] = block;
}

unsigned short Chunk::getBlock(int x, int y, int z)
{
    return blocks[y & BITMASK_HEIGHT][x & BITMASK_WIDTH][z & BITMASK_DEPTH];
}

void Chunk::renderTick(Shader& shader, DirectRenderer& dr, float lag)
{
    shader.translateTo(chunkX * WIDTH, 0, chunkZ * DEPTH);
    shader.updateModelMatrix();
    for(int i = 0; i < HEIGHT_PARTIONS; i++)
    {
        if(dirty[i])
        {
            buildChunk(i);
            dirty[i] = false;
        }
        mesh[i].draw();
    }
}

void Chunk::buildChunk(int partionY)
{    
    Mesh& m = mesh[partionY];
    
    int max = (partionY + 1) * PARTION_HEIGHT;
    for(int y = partionY * PARTION_HEIGHT; y < max; y++)
    {
        for(int x = 0; x < WIDTH; x++)
        {
            for(int z = 0; z < DEPTH; z++)
            {
                if(blocks[y][x][z] == 1)
                {
                    for(int i = 0; i < 36; i++)
                    {
                        m.addColor(1, 0, 0, 1);
                    }
                    
                    // bottom
                    if(y <= 0 || blocks[y - 1][x][z] != 1)
                    {
                        //m.addTexture(0.125f, 0.0f);
                        //m.addTexture(0.1875f, 0.0f);
                        //m.addTexture(0.125f, 0.0625f);
                        //m.addTexture(0.1875f, 0.0f);
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.125f, 0.0625f);

                        for(int i = 0; i < 6; i++)
                        {
                            m.addNormal(0.0f, -1.0f, 0.0f);
                        }

                        m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 0.0f, z + 1.0f);
                        m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                    }

                    // top
                    if(y + 1 >= HEIGHT || blocks[y + 1][x][z] != 1)
                    {
                        //m.addTexture(0.25f, 0.0f);
                        //m.addTexture(0.25f, 0.0625f);
                        //m.addTexture(0.3125f, 0.0f);
                        //m.addTexture(0.3125f, 0.0f);
                        //m.addTexture(0.25f, 0.0625f);
                        //m.addTexture(0.3125f, 0.0625f);

                        for(int i = 0; i < 6; i++)
                        {
                            m.addNormal(0.0f, 1.0f, 0.0f);
                        }

                        m.addPosition(x + 0.0f, y + 1.0f, z + 0.0f);
                        m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                        m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                    }

                    // right
                    if(x + 1 >= WIDTH || blocks[y][x + 1][z] != 1)
                    {
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.25f, 0.0f);
                        //m.addTexture(0.25f, 0.0625f);
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.1875f, 0.0f);
                        //m.addTexture(0.25f, 0.0f);

                        for(int i = 0; i < 6; i++)
                        {
                            m.addNormal(1.0f, 0.0f, 0.0f);
                        }

                        m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 0.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                    }

                    // left
                    if(x <= 0 || blocks[y][x - 1][z] != 1)
                    {
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.25f, 0.0625f);
                        //m.addTexture(0.25f, 0.0f);
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.25f, 0.0f);
                        //m.addTexture(0.1875f, 0.0f);

                        for(int i = 0; i < 6; i++)
                        {
                            m.addNormal(-1.0f, 0.0f, 0.0f);
                        }

                        m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                        m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                        m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                        m.addPosition(x + 0.0f, y + 1.0f, z + 0.0f);
                    }

                    // back
                    if(z + 1 >= DEPTH || blocks[y][x][z + 1] != 1)
                    {
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.25f, 0.0625f);
                        //m.addTexture(0.25f, 0.0f);
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.25f, 0.0f);
                        //m.addTexture(0.1875f, 0.0f);

                        for(int i = 0; i < 6; i++)
                        {
                            m.addNormal(0.0f, 0.0f, -1.0f);
                        }

                        m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 0.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                        m.addPosition(x + 0.0f, y + 0.0f, z + 1.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 1.0f);
                        m.addPosition(x + 0.0f, y + 1.0f, z + 1.0f);
                    }

                    // front
                    if(z <= 0 || blocks[y][x][z - 1] != 1)
                    {
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.25f, 0.0f);
                        //m.addTexture(0.25f, 0.0625f);
                        //m.addTexture(0.1875f, 0.0625f);
                        //m.addTexture(0.1875f, 0.0f);
                        //m.addTexture(0.25f, 0.0f);

                        for(int i = 0; i < 6; i++)
                        {
                            m.addNormal(0.0f, 0.0f, 1.0f);
                        }

                        m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 0.0f, y + 0.0f, z + 0.0f);
                        m.addPosition(x + 0.0f, y + 1.0f, z + 0.0f);
                        m.addPosition(x + 1.0f, y + 1.0f, z + 0.0f);
                    }
                }
            }
        }
    }
    
    m.build();
}