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#include "Chunk.hpp"
#include "BlockSide.hpp"
namespace MC::World {
void Chunk::set(uint32_t x, uint32_t y, uint32_t z, BlockData data) {
m_blocks.at(pos(x, y, z)) = data;
}
Chunk::BlockData Chunk::get(uint32_t x, uint32_t y, uint32_t z) const {
return m_blocks.at(pos(x, y, z));
}
GFX::Mesh Chunk::mesh() {
std::vector<Vector<3>> positions{};
std::vector<Vector<3>> normals{};
std::vector<Vector<2>> tex_coords{};
std::vector<uint32_t> indices{};
for (int x = 0; x < Width; x++) {
for (int y = 0; y < Height; y++) {
for (int z = 0; z < Width; z++) {
auto type = get(x, y, z).type;
if (type == BlockType::Air) {
continue;
}
for (auto side: BlockSide::all()) {
if (!is_face_visible(x, y, z, side)) {
continue;
}
auto side_positions = side.face();
auto side_normals = face_normals(side);
auto side_tex_coords = face_tex_coords(type, side);
for (auto& position : side_positions) {
position = position + Vector<3>{static_cast<float>(x), static_cast<float>(y), static_cast<float>(z)};
}
uint32_t s = positions.size();
positions.insert(positions.end(), side_positions.begin(), side_positions.end());
normals.insert(normals.end(), side_normals.begin(), side_normals.end());
tex_coords.insert(tex_coords.end(), side_tex_coords.begin(), side_tex_coords.end());
indices.insert(indices.end(), {s, s + 1, s + 3, s + 1, s + 2, s + 3});
}
}
}
}
return {
{positions, normals, tex_coords},
indices,
};
}
Vector<3> Chunk::position() {
return m_position;
}
bool Chunk::is_face_visible(uint32_t x, uint32_t y, uint32_t z, BlockSide side) {
Vector<3, int32_t> offset{};
switch (side) {
case BlockSide::Front:
offset[2] = 1;
break;
case BlockSide::Back:
offset[2] = -1;
break;
case BlockSide::Top:
offset[1] = 1;
break;
case BlockSide::Bottom:
offset[1] = -1;
break;
case BlockSide::Left:
offset[0] = -1;
break;
case BlockSide::Right:
offset[0] = 1;
break;
}
Vector<3, uint32_t> neighbor_pos{
x + offset.x(), y + offset.y(), z + offset.z(),
};
if (
neighbor_pos.x() >= Width || neighbor_pos.x() < 0 ||
neighbor_pos.y() >= Height || neighbor_pos.y() < 0 ||
neighbor_pos.z() >= Width || neighbor_pos.z() < 0
) {
return true;
}
auto neighbor = get(neighbor_pos.x(), neighbor_pos.y(), neighbor_pos.z());
if (neighbor.type == BlockType::Air) {
return true;
}
return false;
}
std::array<Vector<2>, 4> Chunk::face_tex_coords(BlockType type, BlockSide side) {
uint8_t atlas_width = 4;
uint8_t atlas_height = 4;
float width_step = 1.0f / atlas_width;
float height_step = 1.0f / atlas_height;
auto block_coords = [=](uint8_t x, uint8_t y) {
auto t = y * height_step;
auto l = x * width_step;
auto b = t + height_step;
auto r = l + width_step;
return std::array<Vector<2>, 4>{{
{l, b}, {r, b}, {r, t}, {l, t},
}};
};
switch (type) {
case BlockType::Dirt:
return block_coords(1, 0);
case BlockType::Grass:
switch (side) {
case BlockSide::Front:
case BlockSide::Back:
case BlockSide::Left:
case BlockSide::Right:
return block_coords(2, 0);
case BlockSide::Bottom:
return block_coords(1, 0);
case BlockSide::Top:
return block_coords(0, 0);
}
case BlockType::Stone:
return block_coords(3, 0);
case BlockType::Sand:
return block_coords(0, 1);
case BlockType::Water:
return block_coords(1, 1);
case BlockType::Snow:
switch (side) {
case BlockSide::Front:
case BlockSide::Back:
case BlockSide::Left:
case BlockSide::Right:
return block_coords(3, 1);
case BlockSide::Bottom:
return block_coords(1, 0);
case BlockSide::Top:
return block_coords(2, 1);
}
case BlockType::Air:
return {};
}
}
std::array<Vector<3>, 4> Chunk::face_normals(BlockSide side) {
auto is_side = [=](BlockSide s) -> float { return s == side; };
Vector<3> normal = {
is_side(BlockSide::Right) - is_side(BlockSide::Left),
is_side(BlockSide::Top) - is_side(BlockSide::Bottom),
is_side(BlockSide::Front) - is_side(BlockSide::Back),
};
return {normal, normal, normal, normal};
}
uint64_t Chunk::pos(uint32_t x, uint32_t y, uint32_t z) {
return x + Width * y + Width * Height * z;
}
}
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