void VoxelMap::get_buffer_copy(Vector3i min_pos, VoxelBuffer & dst_buffer, unsigned int channel) {
ERR_FAIL_INDEX(channel, VoxelBuffer::MAX_CHANNELS);
Vector3i max_pos = min_pos + dst_buffer.get_size();
Vector3i min_block_pos = voxel_to_block(min_pos);
Vector3i max_block_pos = voxel_to_block(max_pos - Vector3i(1,1,1)) + Vector3i(1,1,1);
ERR_FAIL_COND((max_block_pos - min_block_pos) != Vector3(3, 3, 3));
Vector3i bpos;
for (bpos.z = min_block_pos.z; bpos.z < max_block_pos.z; ++bpos.z) {
for (bpos.x = min_block_pos.x; bpos.x < max_block_pos.x; ++bpos.x) {
for (bpos.y = min_block_pos.y; bpos.y < max_block_pos.y; ++bpos.y) {
VoxelBlock * block = get_block(bpos);
if (block) {
VoxelBuffer & src_buffer = **block->voxels;
Vector3i offset = block_to_voxel(bpos);
// Note: copy_from takes care of clamping the area if it's on an edge
dst_buffer.copy_from(src_buffer, min_pos - offset, max_pos - offset, offset - min_pos, channel);
}
else {
Vector3i offset = block_to_voxel(bpos);
dst_buffer.fill_area(
_default_voxel[channel],
offset - min_pos,
offset - min_pos + Vector3i(VoxelBlock::SIZE,VoxelBlock::SIZE, VoxelBlock::SIZE)
);
}
}
}
}
}
Array VoxelMesher::build(const VoxelBuffer &buffer, unsigned int channel, Vector3i min, Vector3i max) {
uint64_t time_before = OS::get_singleton()->get_ticks_usec();
ERR_FAIL_COND_V(_library.is_null(), Array());
ERR_FAIL_COND_V(channel >= VoxelBuffer::MAX_CHANNELS, Array());
const VoxelLibrary &library = **_library;
for (unsigned int i = 0; i < MAX_MATERIALS; ++i) {
Arrays &a = _arrays[i];
a.positions.clear();
a.normals.clear();
a.uvs.clear();
a.colors.clear();
a.indices.clear();
}
float baked_occlusion_darkness;
if (_bake_occlusion)
baked_occlusion_darkness = _baked_occlusion_darkness / 3.0;
// The technique is Culled faces.
// Could be improved with greedy meshing: https://0fps.net/2012/06/30/meshing-in-a-minecraft-game/
// However I don't feel it's worth it yet:
// - Not so much gain for organic worlds with lots of texture variations
// - Works well with cubes but not with any shape
// - Slower
// => Could be implemented in a separate class?
// Data must be padded, hence the off-by-one
Vector3i::sort_min_max(min, max);
const Vector3i pad(1, 1, 1);
min.clamp_to(pad, max);
max.clamp_to(min, buffer.get_size() - pad);
int index_offset = 0;
// Iterate 3D padded data to extract voxel faces.
// This is the most intensive job in this class, so all required data should be as fit as possible.
// The buffer we receive MUST be dense (i.e not compressed, and channels allocated).
// That means we can use raw pointers to voxel data inside instead of using the higher-level getters,
// and then save a lot of time.
uint8_t *type_buffer = buffer.get_channel_raw(Voxel::CHANNEL_TYPE);
// _
// | \
// /\ \\
// / /|\\\
// | |\ \\\
// | \_\ \\|
// | | )
// \ | |
// \ /
CRASH_COND(type_buffer == NULL);
//CRASH_COND(memarr_len(type_buffer) != buffer.get_volume() * sizeof(uint8_t));
// Build lookup tables so to speed up voxel access.
// These are values to add to an address in order to get given neighbor.
int row_size = buffer.get_size().y;
int deck_size = buffer.get_size().x * row_size;
int side_neighbor_lut[Cube::SIDE_COUNT];
side_neighbor_lut[Cube::SIDE_LEFT] = row_size;
side_neighbor_lut[Cube::SIDE_RIGHT] = -row_size;
side_neighbor_lut[Cube::SIDE_BACK] = -deck_size;
side_neighbor_lut[Cube::SIDE_FRONT] = deck_size;
side_neighbor_lut[Cube::SIDE_BOTTOM] = -1;
side_neighbor_lut[Cube::SIDE_TOP] = 1;
int edge_neighbor_lut[Cube::EDGE_COUNT];
edge_neighbor_lut[Cube::EDGE_BOTTOM_BACK] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_BACK];
edge_neighbor_lut[Cube::EDGE_BOTTOM_FRONT] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_FRONT];
edge_neighbor_lut[Cube::EDGE_BOTTOM_LEFT] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_LEFT];
edge_neighbor_lut[Cube::EDGE_BOTTOM_RIGHT] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_RIGHT];
edge_neighbor_lut[Cube::EDGE_BACK_LEFT] = side_neighbor_lut[Cube::SIDE_BACK] + side_neighbor_lut[Cube::SIDE_LEFT];
edge_neighbor_lut[Cube::EDGE_BACK_RIGHT] = side_neighbor_lut[Cube::SIDE_BACK] + side_neighbor_lut[Cube::SIDE_RIGHT];
edge_neighbor_lut[Cube::EDGE_FRONT_LEFT] = side_neighbor_lut[Cube::SIDE_FRONT] + side_neighbor_lut[Cube::SIDE_LEFT];
edge_neighbor_lut[Cube::EDGE_FRONT_RIGHT] = side_neighbor_lut[Cube::SIDE_FRONT] + side_neighbor_lut[Cube::SIDE_RIGHT];
edge_neighbor_lut[Cube::EDGE_TOP_BACK] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_BACK];
edge_neighbor_lut[Cube::EDGE_TOP_FRONT] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_FRONT];
edge_neighbor_lut[Cube::EDGE_TOP_LEFT] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_LEFT];
edge_neighbor_lut[Cube::EDGE_TOP_RIGHT] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_RIGHT];
int corner_neighbor_lut[Cube::CORNER_COUNT];
corner_neighbor_lut[Cube::CORNER_BOTTOM_BACK_LEFT] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_BACK] + side_neighbor_lut[Cube::SIDE_LEFT];
corner_neighbor_lut[Cube::CORNER_BOTTOM_BACK_RIGHT] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_BACK] + side_neighbor_lut[Cube::SIDE_RIGHT];
corner_neighbor_lut[Cube::CORNER_BOTTOM_FRONT_RIGHT] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_FRONT] + side_neighbor_lut[Cube::SIDE_RIGHT];
corner_neighbor_lut[Cube::CORNER_BOTTOM_FRONT_LEFT] = side_neighbor_lut[Cube::SIDE_BOTTOM] + side_neighbor_lut[Cube::SIDE_FRONT] + side_neighbor_lut[Cube::SIDE_LEFT];
corner_neighbor_lut[Cube::CORNER_TOP_BACK_LEFT] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_BACK] + side_neighbor_lut[Cube::SIDE_LEFT];
corner_neighbor_lut[Cube::CORNER_TOP_BACK_RIGHT] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_BACK] + side_neighbor_lut[Cube::SIDE_RIGHT];
corner_neighbor_lut[Cube::CORNER_TOP_FRONT_RIGHT] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_FRONT] + side_neighbor_lut[Cube::SIDE_RIGHT];
corner_neighbor_lut[Cube::CORNER_TOP_FRONT_LEFT] = side_neighbor_lut[Cube::SIDE_TOP] + side_neighbor_lut[Cube::SIDE_FRONT] + side_neighbor_lut[Cube::SIDE_LEFT];
uint64_t time_prep = OS::get_singleton()->get_ticks_usec() - time_before;
time_before = OS::get_singleton()->get_ticks_usec();
for (unsigned int z = min.z; z < max.z; ++z) {
for (unsigned int x = min.x; x < max.x; ++x) {
for (unsigned int y = min.y; y < max.y; ++y) {
// min and max are chosen such that you can visit 1 neighbor away from the current voxel without size check
// TODO In this intensive routine, there is a way to make voxel access fastest by getting a pointer to the channel,
// and using offset lookup to get neighbors rather than going through get_voxel validations
int voxel_index = y + x * row_size + z * deck_size;
int voxel_id = type_buffer[voxel_index];
if (voxel_id != 0 && library.has_voxel(voxel_id)) {
const Voxel &voxel = library.get_voxel_const(voxel_id);
Arrays &arrays = _arrays[voxel.get_material_id()];
// Hybrid approach: extract cube faces and decimate those that aren't visible,
// and still allow voxels to have geometry that is not a cube
// Sides
for (unsigned int side = 0; side < Cube::SIDE_COUNT; ++side) {
const PoolVector<Vector3> &positions = voxel.get_model_side_positions(side);
int vertex_count = positions.size();
if (vertex_count != 0) {
int neighbor_voxel_id = type_buffer[voxel_index + side_neighbor_lut[side]];
// TODO Better face visibility test
if (is_face_visible(library, voxel, neighbor_voxel_id)) {
// The face is visible
int shaded_corner[8] = { 0 };
if (_bake_occlusion) {
// Combinatory solution for https://0fps.net/2013/07/03/ambient-occlusion-for-minecraft-like-worlds/
for (unsigned int j = 0; j < 4; ++j) {
unsigned int edge = Cube::g_side_edges[side][j];
int edge_neighbor_id = type_buffer[voxel_index + edge_neighbor_lut[edge]];
if (!is_transparent(library, edge_neighbor_id)) {
shaded_corner[Cube::g_edge_corners[edge][0]] += 1;
shaded_corner[Cube::g_edge_corners[edge][1]] += 1;
}
}
for (unsigned int j = 0; j < 4; ++j) {
unsigned int corner = Cube::g_side_corners[side][j];
if (shaded_corner[corner] == 2) {
shaded_corner[corner] = 3;
} else {
int corner_neigbor_id = type_buffer[voxel_index + corner_neighbor_lut[corner]];
if (!is_transparent(library, corner_neigbor_id)) {
shaded_corner[corner] += 1;
}
}
}
}
PoolVector<Vector3>::Read rv = positions.read();
PoolVector<Vector2>::Read rt = voxel.get_model_side_uv(side).read();
// Subtracting 1 because the data is padded
Vector3 pos(x - 1, y - 1, z - 1);
// Append vertices of the faces in one go, don't use push_back
{
int append_index = arrays.positions.size();
arrays.positions.resize(arrays.positions.size() + vertex_count);
Vector3 *w = arrays.positions.ptrw() + append_index;
for (unsigned int i = 0; i < vertex_count; ++i) {
w[i] = rv[i] + pos;
}
}
{
int append_index = arrays.uvs.size();
arrays.uvs.resize(arrays.uvs.size() + vertex_count);
memcpy(arrays.uvs.ptrw() + append_index, rt.ptr(), vertex_count * sizeof(Vector2));
}
{
int append_index = arrays.normals.size();
arrays.normals.resize(arrays.normals.size() + vertex_count);
Vector3 *w = arrays.normals.ptrw() + append_index;
for (unsigned int i = 0; i < vertex_count; ++i) {
w[i] = Cube::g_side_normals[side].to_vec3();
}
}
if (_bake_occlusion) {
// Use color array
int append_index = arrays.colors.size();
arrays.colors.resize(arrays.colors.size() + vertex_count);
Color *w = arrays.colors.ptrw() + append_index;
for (unsigned int i = 0; i < vertex_count; ++i) {
Vector3 v = rv[i];
// General purpose occlusion colouring.
// TODO Optimize for cubes
// TODO Fix occlusion inconsistency caused by triangles orientation? Not sure if worth it
float shade = 0;
for (unsigned int j = 0; j < 4; ++j) {
unsigned int corner = Cube::g_side_corners[side][j];
if (shaded_corner[corner]) {
float s = baked_occlusion_darkness * static_cast<float>(shaded_corner[corner]);
float k = 1.0 - Cube::g_corner_position[corner].distance_to(v);
if (k < 0.0)
k = 0.0;
s *= k;
if (s > shade)
shade = s;
}
}
float gs = 1.0 - shade;
w[i] = Color(gs, gs, gs);
}
}
const PoolVector<int> &side_indices = voxel.get_model_side_indices(side);
PoolVector<int>::Read ri = side_indices.read();
unsigned int index_count = side_indices.size();
{
int i = arrays.indices.size();
arrays.indices.resize(arrays.indices.size() + index_count);
int *w = arrays.indices.ptrw();
for(unsigned int j = 0; j < index_count; ++j) {
w[i++] = index_offset + ri[j];
}
}
index_offset += vertex_count;
}
}
}
// Inside
if (voxel.get_model_positions().size() != 0) {
// TODO Get rid of push_backs
const PoolVector<Vector3> &vertices = voxel.get_model_positions();
int vertex_count = vertices.size();
PoolVector<Vector3>::Read rv = vertices.read();
PoolVector<Vector3>::Read rn = voxel.get_model_normals().read();
PoolVector<Vector2>::Read rt = voxel.get_model_uv().read();
Vector3 pos(x - 1, y - 1, z - 1);
for (unsigned int i = 0; i < vertex_count; ++i) {
arrays.normals.push_back(rn[i]);
arrays.uvs.push_back(rt[i]);
arrays.positions.push_back(rv[i] + pos);
}
if(_bake_occlusion) {
// TODO handle ambient occlusion on inner parts
arrays.colors.push_back(Color(1,1,1));
}
const PoolVector<int> &indices = voxel.get_model_indices();
PoolVector<int>::Read ri = indices.read();
unsigned int index_count = indices.size();
for(unsigned int i = 0; i < index_count; ++i) {
arrays.indices.push_back(index_offset + ri[i]);
}
index_offset += vertex_count;
}
}
}
}
}
uint64_t time_meshing = OS::get_singleton()->get_ticks_usec() - time_before;
time_before = OS::get_singleton()->get_ticks_usec();
// Commit mesh
// print_line(String("Made mesh v: ") + String::num(_arrays[0].positions.size())
// + String(", i: ") + String::num(_arrays[0].indices.size()));
Array surfaces;
// TODO We could return a single byte array and use Mesh::add_surface down the line?
for (int i = 0; i < MAX_MATERIALS; ++i) {
const Arrays &arrays = _arrays[i];
if (arrays.positions.size() != 0) {
/*print_line("Arrays:");
for(int i = 0; i < arrays.positions.size(); ++i)
print_line(String(" P {0}").format(varray(arrays.positions[i])));
for(int i = 0; i < arrays.normals.size(); ++i)
print_line(String(" N {0}").format(varray(arrays.normals[i])));
for(int i = 0; i < arrays.uvs.size(); ++i)
print_line(String(" UV {0}").format(varray(arrays.uvs[i])));*/
Array mesh_arrays;
mesh_arrays.resize(Mesh::ARRAY_MAX);
{
PoolVector<Vector3> positions;
PoolVector<Vector2> uvs;
PoolVector<Vector3> normals;
PoolVector<Color> colors;
PoolVector<int> indices;
raw_copy_to(positions, arrays.positions);
raw_copy_to(uvs, arrays.uvs);
raw_copy_to(normals, arrays.normals);
raw_copy_to(colors, arrays.colors);
raw_copy_to(indices, arrays.indices);
mesh_arrays[Mesh::ARRAY_VERTEX] = positions;
mesh_arrays[Mesh::ARRAY_TEX_UV] = uvs;
mesh_arrays[Mesh::ARRAY_NORMAL] = normals;
mesh_arrays[Mesh::ARRAY_COLOR] = colors;
mesh_arrays[Mesh::ARRAY_INDEX] = indices;
}
surfaces.append(mesh_arrays);
}
}
uint64_t time_commit = OS::get_singleton()->get_ticks_usec() - time_before;
//print_line(String("P: {0}, M: {1}, C: {2}").format(varray(time_prep, time_meshing, time_commit)));
return surfaces;
}