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maszyna/scene/logiccontainer.cpp
maj00r 2660d14565 Stream the scenery: a baked terrain heightfield, a logic container, and prefabs 
Today's work on the binary scene format plan (binary-scene-format-plan.md), from the
first measurement to a terrain that bakes itself on first run and streams from a
thread. The step-by-step history is kept on backup/scene-streaming-format-presquash-0916.

Measuring first. -loadprofile times a scenery load by stage and by node kind and reports
node counts and resident memory. On l204 terrain is 95% of the bytes and 99.8% of the
nodes; on quarkmce2007 vehicles, not models, dominate what is left. The terrain turned
out to be a heightfield in all but name, a ribbon covering 12% of its bounding box.

The heightfield. scene/heightfieldformat.h is the .ehf layout: Morton-ordered tiles
of 128 samples with one shared edge sample, a point-sampled mip chain, zstd per tile,
a nodata sentinel, a material palette with a measured tiling per material, and a stamp
of the rules that decided what counted as terrain. scene/heightfieldreader.h reads it
for the tool, the renderer and the loader alike, and scene/terraincooker.h writes it,
shared by the terraincook tool and the engine so a first-run bake is the file the tool
would have made. The cooker rasterises every triangle where it is drawn (through
scene::place_in_world, the placement the region applies too), keeps an upper surface
laid within half a metre over another and the lower of two further apart, and then
asks each triangle whether the heightfield shows it: laid, reaching a sample, keeping
nearly all it claimed, and with the ground around it drawn at every level out to 2 km.

Baking on first run. simulation/terrainbake bakes <scenario>.ehf the first time a
scenery is opened, choosing the grid step from the first 200,000 vertices, and on later
loads leaves out the triangles its node table says the heightfield shows. Everything
else - trees, grass tufts, gantries, bridge decks - is drawn as written, so a bad bake
can at worst draw something twice, and the heightfield sits 2 cm under the triangles so
the original wins there. Nodes are keyed by file, line, include parameters and
placement; an edited file changes its keys and those nodes are drawn again. A bake under
older rules, or without its table, is thrown away and redone. A launcher copy named
$scenario shares the scenario's files. -nobaketerrain shows the triangles as written.
A scenery can still name hand-cooked fields, several at different steps.

Drawing and streaming. rendering/terrainclipmap draws resident tiles at the mip level
their distance earns, deriving the grid from gl_VertexID and texturing in world space
with the scenery's own materials. rendering/terraintileloader reads and decodes tiles on
a thread of its own; the renderer rescans what is in range only after moving a quarter
of a tile, asks for what is missing nearest first, uploads at most 32 tiles a frame,
drops arrivals the camera has moved past, and keeps drawing a tile at the level it has
until the right one arrives. The terrain has its own range, terrainrange in the ini and
a slider in the debug panel, 20 km by default and independent of basedrawrange; the far
plane of an ordinary view is pushed out to it. The debug panel shows the range, tiles in
view, on the gpu, wanted and queued, and how many sit at each level.

Events. The event queue moved out of the events into a binary heap with a deterministic
tie-break, and an event is handed its activator instead of storing it, so basic_event
is a definition and nothing else.

The logic container. scene/logicformat.h and scene/logiccontainer write a scenery's
events, their targets and sibling chains as flat, deterministic arrays with a schema
hash that refuses a mismatched build. simulation/logiccook cooks it from the loaded
state whenever it is missing, stale or unreadable, reads it straight back to check it,
and resolves each target to a position in the registry its event kind searches.
-cooklogic forces a cook, -verifylogic only checks. Nothing reads it at load yet.

Prefabs. scene/prefab describes a signal by the aspects it can show - lights, speeds,
animation channels, a sound - instead of pasting an .inc per variant, and expands an
instance to ordinary scenery text. Tried on a light signal and a shape signal.

Screenshots without a person present: -shot x,y,z[,yaw[,pitch]], -shotsettle, -shotstay.
2026-09-16 23:18:09 +02:00

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/*
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
*/
module;
#include <array>
#include <cstdint>
#include <cstring>
#include <fstream>
#include <string>
#include <string_view>
#include <vector>
#include "scene/logicformat.h"
module eu07.scene.logiccontainer;
import eu07.utilities.logs;
import eu07.utilities.utilities;
namespace scene::logic {
namespace {
// pads the stream out to the next section boundary with zeroes, so a cooked file has no
// uninitialised bytes in it and two cooks of the same scenery compare equal
void
pad( std::ofstream &Output ) {
std::array<char, alignment> zeroes {};
auto const position { static_cast<std::size_t>( Output.tellp() ) };
auto const padding { aligned( position ) - position };
if( padding > 0 ) {
Output.write( zeroes.data(), static_cast<std::streamsize>( padding ) );
}
}
template <typename Type_>
void
write_array( std::ofstream &Output, std::vector<Type_> const &Data ) {
if( false == Data.empty() ) {
Output.write( reinterpret_cast<char const *>( Data.data() ), static_cast<std::streamsize>( Data.size() * sizeof( Type_ ) ) );
}
}
template <typename Type_>
bool
read_array( std::ifstream &Input, section_entry const &Section, std::vector<Type_> &Data ) {
if( Section.elementsize != sizeof( Type_ ) ) { return false; }
if( Section.bytes != Section.count * sizeof( Type_ ) ) { return false; }
Data.resize( Section.count );
Input.seekg( static_cast<std::streamoff>( Section.offset ) );
if( Section.count > 0 ) {
Input.read( reinterpret_cast<char *>( Data.data() ), static_cast<std::streamsize>( Section.bytes ) );
}
return static_cast<bool>( Input );
}
} // anonymous namespace
std::uint32_t
container_writer::intern( std::string const &Text ) {
auto const lookup { m_interned.find( Text ) };
if( lookup != m_interned.end() ) {
return lookup->second;
}
auto const index { static_cast<std::uint32_t>( m_strings.size() ) };
m_strings.emplace_back( Text );
m_interned.emplace( Text, index );
return index;
}
void
container_writer::add_event( event_record Record, std::vector<target_entry> const &Targets ) {
Record.targetfirst = static_cast<std::uint32_t>( m_targets.size() );
Record.targetcount = static_cast<std::uint32_t>( Targets.size() );
m_targets.insert( m_targets.end(), Targets.begin(), Targets.end() );
m_events.emplace_back( Record );
}
bool
container_writer::write( std::string const &Path ) const {
std::ofstream output( Path, std::ios::binary | std::ios::trunc );
if( false == output.good() ) {
ErrorLog( "Logic container: cannot write \"" + Path + "\"" );
return false;
}
// the strings blob and its table are built first, since the header has to know how big
// every section is before any of them is written
std::vector<char> blob;
std::vector<string_entry> table;
table.reserve( m_strings.size() );
for( auto const &text : m_strings ) {
table.emplace_back( string_entry{ static_cast<std::uint32_t>( blob.size() ), static_cast<std::uint32_t>( text.size() ) } );
blob.insert( blob.end(), text.begin(), text.end() );
}
std::array<section_entry, static_cast<std::size_t>( section::count )> sections {};
auto offset { aligned( sizeof( file_header ) + sizeof( sections ) ) };
auto const place {
[ &offset, &sections ]( section const Kind, std::size_t const Elementsize, std::size_t const Count ) {
auto &entry { sections[ static_cast<std::size_t>( Kind ) ] };
entry.kind = static_cast<std::uint32_t>( Kind );
entry.elementsize = static_cast<std::uint32_t>( Elementsize );
entry.count = Count;
entry.bytes = Elementsize * Count;
entry.offset = offset;
offset = aligned( offset + entry.bytes );
} };
place( section::strings, 1, blob.size() );
place( section::stringtable, sizeof( string_entry ), table.size() );
place( section::events, sizeof( event_record ), m_events.size() );
place( section::targets, sizeof( target_entry ), m_targets.size() );
file_header header {};
header.magic = magic;
header.version = version;
header.schema_hash = schema_hash;
header.endian = endian_marker;
header.sectioncount = static_cast<std::uint32_t>( section::count );
header.filesize = offset;
output.write( reinterpret_cast<char const *>( &header ), sizeof( header ) );
output.write( reinterpret_cast<char const *>( sections.data() ), sizeof( sections ) );
pad( output );
write_array( output, blob );
pad( output );
write_array( output, table );
pad( output );
write_array( output, m_events );
pad( output );
write_array( output, m_targets );
pad( output );
if( false == output.good() ) {
ErrorLog( "Logic container: failed while writing \"" + Path + "\"" );
return false;
}
WriteLog(
"Logic container: wrote \"" + Path + "\", "
+ std::to_string( m_events.size() ) + " events, "
+ std::to_string( m_targets.size() ) + " targets, "
+ std::to_string( m_strings.size() ) + " strings, "
+ std::to_string( offset ) + " bytes" );
return true;
}
// reads the header and checks it, and the file's size, against what this build writes. a
// cooked container is a cache, so anything unexpected means fall back to the text, not guess
// at what an older writer meant
static bool
accepted( std::ifstream &Input, std::string const &Path ) {
if( false == Input.good() ) { return false; }
file_header header {};
Input.read( reinterpret_cast<char *>( &header ), sizeof( header ) );
if( false == static_cast<bool>( Input ) ) { return false; }
if( header.magic != magic ) {
ErrorLog( "Logic container \"" + Path + "\" is not one" );
return false;
}
if( ( header.version != version ) || ( header.schema_hash != schema_hash ) ) {
WriteLog( "Logic container \"" + Path + "\" was cooked by a different build, ignoring it" );
return false;
}
if( header.endian != endian_marker ) {
ErrorLog( "Logic container \"" + Path + "\" was cooked on the other endianness" );
return false;
}
if( header.sectioncount != static_cast<std::uint32_t>( section::count ) ) {
WriteLog( "Logic container \"" + Path + "\" holds a different set of sections, ignoring it" );
return false;
}
Input.seekg( 0, std::ios::end );
if( static_cast<std::uint64_t>( Input.tellg() ) != header.filesize ) {
ErrorLog( "Logic container \"" + Path + "\" is truncated" );
return false;
}
return true;
}
bool
container_reader::readable( std::string const &Path ) {
std::ifstream input( Path, std::ios::binary );
return accepted( input, Path );
}
bool
container_reader::open( std::string const &Path ) {
close();
std::ifstream input( Path, std::ios::binary );
if( false == accepted( input, Path ) ) { return false; }
input.seekg( sizeof( file_header ) );
std::array<section_entry, static_cast<std::size_t>( section::count )> sections {};
input.read( reinterpret_cast<char *>( sections.data() ), sizeof( sections ) );
if( false == static_cast<bool>( input ) ) { return false; }
auto const &strings { sections[ static_cast<std::size_t>( section::strings ) ] };
m_strings.resize( strings.count );
input.seekg( static_cast<std::streamoff>( strings.offset ) );
if( strings.count > 0 ) {
input.read( m_strings.data(), static_cast<std::streamsize>( strings.bytes ) );
}
if( ( false == read_array( input, sections[ static_cast<std::size_t>( section::stringtable ) ], m_stringtable ) )
|| ( false == read_array( input, sections[ static_cast<std::size_t>( section::events ) ], m_events ) )
|| ( false == read_array( input, sections[ static_cast<std::size_t>( section::targets ) ], m_targets ) ) ) {
ErrorLog( "Logic container \"" + Path + "\" has a section this build cannot read" );
close();
return false;
}
m_ready = true;
return true;
}
void
container_reader::close() {
m_ready = false;
m_strings.clear();
m_stringtable.clear();
m_events.clear();
m_targets.clear();
}
std::string_view
container_reader::string( std::uint32_t const Index ) const {
if( Index >= m_stringtable.size() ) { return {}; }
auto const &entry { m_stringtable[ Index ] };
return { m_strings.data() + entry.offset, entry.length };
}
std::string
container_path( std::string const &Sceneryfile ) {
return scenery_sidecar( Sceneryfile, ".logic" );
}
event_kind
kind_of( std::string const &Type ) {
if( Type == "updatevalues" ) { return event_kind::updatevalues; }
else if( Type == "addvalues" ) { return event_kind::addvalues; }
else if( Type == "copyvalues" ) { return event_kind::copyvalues; }
else if( Type == "getvalues" ) { return event_kind::getvalues; }
else if( Type == "putvalues" ) { return event_kind::putvalues; }
else if( Type == "whois" ) { return event_kind::whois; }
else if( Type == "logvalues" ) { return event_kind::logvalues; }
else if( Type == "multiple" ) { return event_kind::multiple; }
else if( Type == "switch" ) { return event_kind::switchevent; }
else if( Type == "trackvel" ) { return event_kind::trackvel; }
else if( Type == "sound" ) { return event_kind::sound; }
else if( Type == "texture" ) { return event_kind::texture; }
else if( Type == "animation" ) { return event_kind::animation; }
else if( Type == "lights" ) { return event_kind::lights; }
else if( Type == "voltage" ) { return event_kind::voltage; }
else if( Type == "visible" ) { return event_kind::visible; }
else if( Type == "friction" ) { return event_kind::friction; }
else if( Type == "message" ) { return event_kind::message; }
else if( Type == "lua" ) { return event_kind::lua; }
return event_kind::unknown;
}
} // namespace scene::logic
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