cube-game-plus-plus/client/rendering/renderer/WorldRenderer.cpp

#include "client/rendering/renderer/WorldRenderer.h"
#include <iostream>

WorldRenderer::WorldRenderer(const World& world) : world(world), texture("resources/textures.png"),
normalTexture("resources/textures.png") {
    for(uint x = 0; x < World::WORLD_SIZE; x++) {
        for(uint y = 0; y < World::WORLD_SIZE; y++) {
            for(uint z = 0; z < World::WORLD_SIZE; z++) {
                if(world.getBlock(x, y, z).getId() != 0) {
                    addCube(x, y, z,
                            isAir(x, y - 1, z), isAir(x, y + 1, z),
                            isAir(x - 1, y, z), isAir(x + 1, y, z),
                            isAir(x, y, z + 1), isAir(x, y, z - 1));
                }
            }
        }
    }
    mesh.build();
}

void WorldRenderer::render(float lag, Renderer& renderer) const {
    (void) lag;
    (void) renderer;
    texture.bind(0);
    normalTexture.bind(2);
    mesh.draw();
}

bool WorldRenderer::isAir(uint x, uint y, uint z) const {
    return world.getBlock(x, y, z).getId() == 0;
}

void WorldRenderer::addCube(float x, float y, float z, bool bottom, bool top, bool left, bool right, bool front, bool back) {
    const float ERROR = 1.0f / 1024.0f;
    if(bottom) {
        mesh.add({x - ERROR, y - ERROR, z - ERROR, 0.125f, 0.0f, 0, -1, 0});
        mesh.add({x + 1 + ERROR, y - ERROR, z - ERROR, 0.1875f, 0.0f, 0, -1, 0});
        mesh.add({x - ERROR, y - ERROR, z + 1 + ERROR, 0.125f, 0.0625f, 0, -1, 0});

        mesh.add({x + 1 + ERROR, y - ERROR, z - ERROR, 0.1875f, 0.0f, 0, -1, 0});
        mesh.add({x + 1 + ERROR, y - ERROR, z + 1 + ERROR, 0.1875f, 0.0625f, 0, -1, 0});
        mesh.add({x - ERROR, y - ERROR, z + 1 + ERROR, 0.125f, 0.0625f, 0, -1, 0});
    }
    if(top) {
        mesh.add({x - ERROR, y + 1 + ERROR, z - ERROR, 0.25f, 0.0f, 0, 1, 0});
        mesh.add({x - ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.25f, 0.0625f, 0, 1, 0});
        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z - ERROR, 0.3125f, 0.0f, 0, 1, 0});

        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z - ERROR, 0.3125f, 0.0f, 0, 1, 0});
        mesh.add({x - ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.25f, 0.0625f, 0, 1, 0});
        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.3125f, 0.0625f, 0, 1, 0});
    }
    if(left) {
        mesh.add({x - ERROR, y - ERROR, z - ERROR, 0.1875f, 0.0625f, -1, 0, 0});
        mesh.add({x - ERROR, y - ERROR, z + 1 + ERROR, 0.25f, 0.0625f, -1, 0, 0});
        mesh.add({x - ERROR, y + 1 + ERROR, z - ERROR, 0.1875f, 0.0f, -1, 0, 0});

        mesh.add({x - ERROR, y - ERROR, z + 1 + ERROR, 0.25f, 0.0625f, -1, 0, 0});
        mesh.add({x - ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.25f, 0.0f, -1, 0, 0});
        mesh.add({x - ERROR, y + 1 + ERROR, z - ERROR, 0.1875f, 0.0f, -1, 0, 0});
    }
    if(right) {
        mesh.add({x + 1 + ERROR, y - ERROR, z - ERROR, 0.25f, 0.0625f, 1, 0, 0});
        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z - ERROR, 0.25f, 0.0f, 1, 0, 0});
        mesh.add({x + 1 + ERROR, y - ERROR, z + 1 + ERROR, 0.1875f, 0.0625f, 1, 0, 0});

        mesh.add({x + 1 + ERROR, y - ERROR, z + 1 + ERROR, 0.1875f, 0.0625f, 1, 0, 0});
        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z - ERROR, 0.25f, 0.0f, 1, 0, 0});
        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.1875f, 0.0f, 1, 0, 0});
    }
    if(front) {
        mesh.add({x - ERROR, y - ERROR, z + 1 + ERROR, 0.1875f, 0.0625f, 0, 0, 1});
        mesh.add({x + 1 + ERROR, y - ERROR, z + 1 + ERROR, 0.25f, 0.0625f, 0, 0, 1});
        mesh.add({x - ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.1875f, 0.0f, 0, 0, 1});

        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.25f, 0.0f, 0, 0, 1});
        mesh.add({x - ERROR, y + 1 + ERROR, z + 1 + ERROR, 0.1875f, 0.0f, 0, 0, 1});
        mesh.add({x + 1 + ERROR, y - ERROR, z + 1 + ERROR, 0.25f, 0.0625f, 0, 0, 1});
    }
    if(back) {
        mesh.add({x - ERROR, y - ERROR, z - ERROR, 0.25f, 0.0625f, 0, 0, -1});
        mesh.add({x - ERROR, y + 1 + ERROR, z - ERROR, 0.25f, 0.0f, 0, 0, -1});
        mesh.add({x + 1 + ERROR, y - ERROR, z - ERROR, 0.1875f, 0.0625f, 0, 0, -1});

        mesh.add({x + 1 + ERROR, y + 1 + ERROR, z - ERROR, 0.1875f, 0.0f, 0, 0, -1});
        mesh.add({x + 1 + ERROR, y - ERROR, z - ERROR, 0.1875f, 0.0625f, 0, 0, -1});
        mesh.add({x - ERROR, y + 1 + ERROR, z - ERROR, 0.25f, 0.0f, 0, 0, -1});
    }
}