prust 0.2.2

Rust bindings for the Procedural Runtime of ArcGIS CityEngine.
Documentation 
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#include "bindings.h"

#include "prt/API.h"
#include "prt/EncoderInfo.h"
#include "prt/ResolveMap.h"

#include <filesystem>
#include <map>
#include <string>
#include <vector>

namespace {

using AttributeMapBuilderUPtr = std::unique_ptr<prt::AttributeMapBuilder, PRTObjectDestroyer>;
using AttributeMapUPtr = std::unique_ptr<const prt::AttributeMap, PRTObjectDestroyer>;
using EncoderInfoUPtr = std::unique_ptr<const prt::EncoderInfo, PRTObjectDestroyer>;
using InitialShapeBuilderUPtr = std::unique_ptr<prt::InitialShapeBuilder, PRTObjectDestroyer>;
using InitialShapeUPtr = std::unique_ptr<const prt::InitialShape, PRTObjectDestroyer>;
using InitialShapeNOPtrVector = std::vector<const prt::InitialShape*>;
using ResolveMapUPtr = std::unique_ptr<const prt::ResolveMap, PRTObjectDestroyer>;
using ResolveMapBuilderUPtr = std::unique_ptr<prt::ResolveMapBuilder, PRTObjectDestroyer>;

template <typename inC, typename outC, typename FUNC>
std::basic_string<outC> callAPI(FUNC f, const std::basic_string<inC>& s) {
	std::vector<outC> buffer(s.size());
	size_t size = buffer.size();
	f(s.c_str(), buffer.data(), &size, nullptr);
	if (size > buffer.size()) {
		buffer.resize(size);
		f(s.c_str(), buffer.data(), &size, nullptr);
	}
	return std::basic_string<outC>{buffer.data()};
}

std::string toUTF8FromUTF16(const std::wstring& utf16String) {
	return callAPI<wchar_t, char>(prt::StringUtils::toUTF8FromUTF16, utf16String);
}

std::wstring toUTF16FromUTF8(const std::string& utf8String) {
	return callAPI<char, wchar_t>(prt::StringUtils::toUTF16FromUTF8, utf8String);
}

const prt::AttributeMap* createValidatedOptions(const wchar_t* encID,
                                                const prt::AttributeMap* unvalidatedOptions = nullptr) {
	const EncoderInfoUPtr encInfo(prt::createEncoderInfo(encID));
	const prt::AttributeMap* validatedOptions = nullptr;
	const prt::AttributeMap* optionStates = nullptr;
	const prt::Status s =
	        encInfo->createValidatedOptionsAndStates(unvalidatedOptions, &validatedOptions, &optionStates);
	if (optionStates != nullptr)
		optionStates->destroy();
	return (s == prt::STATUS_OK) ? validatedOptions : nullptr;
}

} // namespace

void InitialShapeWrapper::setAttributes(prt::InitialShapeBuilder& isb, const prt::AttributeMap* am,
                                        const prt::ResolveMap* rm) const {
	std::wstring wRuleFile = toUTF16FromUTF8(ruleFile);
	std::wstring wStartRule = toUTF16FromUTF8(startRule);
	std::wstring wName = toUTF16FromUTF8(name);
	isb.setAttributes(wRuleFile.c_str(), wStartRule.c_str(), randomSeed, wName.c_str(), am, rm);
}

RustCallbacksBinding::RustCallbacksBinding(AbstractCallbacksBinding* binding) : mBinding(binding) {
	auto prustTempPath = std::filesystem::temp_directory_path() / "prust";
	std::filesystem::create_directories(prustTempPath);
	mDelegate.reset(prt::FileOutputCallbacks::create(prustTempPath.wstring().c_str()));
}

prt::Status RustCallbacksBinding::generateError(size_t isIndex, prt::Status status, const wchar_t* message) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::assetError(size_t isIndex, prt::CGAErrorLevel level, const wchar_t* key,
                                             const wchar_t* uri, const wchar_t* message) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::cgaError(size_t isIndex, int32_t shapeID, prt::CGAErrorLevel level, int32_t methodId,
                                           int32_t pc, const wchar_t* message) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::cgaPrint(size_t isIndex, int32_t shapeID, const wchar_t* txt) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::cgaReportBool(size_t isIndex, int32_t shapeID, const wchar_t* key, bool value) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::cgaReportFloat(size_t isIndex, int32_t shapeID, const wchar_t* key, double value) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::cgaReportString(size_t isIndex, int32_t shapeID, const wchar_t* key,
                                                  const wchar_t* value) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::attrBool(size_t isIndex, int32_t shapeID, const wchar_t* key, bool value) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::attrFloat(size_t isIndex, int32_t shapeID, const wchar_t* key, double value) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::attrString(size_t isIndex, int32_t shapeID, const wchar_t* key,
                                             const wchar_t* value) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::attrBoolArray(size_t isIndex, int32_t /*shapeID*/, const wchar_t* key,
                                                const bool* values, size_t size, size_t /*nRows*/) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::attrFloatArray(size_t isIndex, int32_t /*shapeID*/, const wchar_t* key,
                                                 const double* values, size_t size, size_t /*nRows*/) {
	return prt::STATUS_OK;
}

prt::Status RustCallbacksBinding::attrStringArray(size_t isIndex, int32_t /*shapeID*/, const wchar_t* key,
                                                  const wchar_t* const* values, size_t size, size_t /*nRows*/) {
	return prt::STATUS_OK;
}

prt::Status ffi_generate(const InitialShapeWrapper* const* ffiInitialShapes, size_t initialShapeCount,
                         const prt::OcclusionSet::Handle* occlusionHandles, const wchar_t* const* encoders,
                         size_t encodersCount, const prt::AttributeMap* const* /*encoderOptions*/,
                         AbstractCallbacksBinding* callbacks, prt::Cache* cache, const prt::OcclusionSet* occlSet,
                         const prt::AttributeMap* generateOptions) {
	std::vector<InitialShapeUPtr> initialShapes; // keeps the initial shapes alive
	initialShapes.reserve(initialShapeCount);
	std::vector<AttributeMapUPtr> initialShapeAttributes; // keeps the initial shape attrs alive
	initialShapeAttributes.reserve(initialShapeCount);
	std::vector<ResolveMapUPtr> resolveMaps; // keeps the initial shape resolve maps alive
	resolveMaps.reserve(initialShapeCount);

	InitialShapeNOPtrVector initialShapePtrs(initialShapeCount, nullptr);
	InitialShapeBuilderUPtr isb(prt::InitialShapeBuilder::create());
	AttributeMapBuilderUPtr amb(prt::AttributeMapBuilder::create());
	ResolveMapBuilderUPtr rmb(prt::ResolveMapBuilder::create());
	for (size_t i = 0; i < initialShapeCount; i++) {
		const InitialShapeWrapper& isw = *ffiInitialShapes[i];
		isb->setGeometry(isw.vertexCoords, isw.vertexCoordsCount, isw.indices, isw.indicesCount, isw.faceCounts,
		                 isw.faceCountsCount);
		initialShapeAttributes.emplace_back(amb->createAttributeMapAndReset()); // TODO
		resolveMaps.emplace_back(rmb->createResolveMapAndReset());              // TODO

		isw.setAttributes(*isb, initialShapeAttributes.back().get(), resolveMaps.back().get());

		initialShapes.emplace_back(isb->createInitialShapeAndReset());
		initialShapePtrs[i] = initialShapes.back().get();
	}

	AttributeMapUPtr validatedEncOpts(createValidatedOptions(encoders[0]));
	std::vector<const prt::AttributeMap*> tmpEncoderOpts{validatedEncOpts.get()};

	auto callbacksBinding = std::make_unique<RustCallbacksBinding>(callbacks);
	prt::Status status =
	        prt::generate(initialShapePtrs.data(), initialShapePtrs.size(), occlusionHandles, encoders, encodersCount,
	                      tmpEncoderOpts.data(), callbacksBinding.get(), cache, occlSet, generateOptions);
	return status;
}

namespace {

using HandlerHolder = std::map<void*, std::unique_ptr<RustLogHandlerBinding>>;
HandlerHolder logHandlerHolder;

} // namespace

void ffi_add_log_handler(AbstractLogHandlerBinding* logHandler) {
	auto [handlerIt, done] =
	        logHandlerHolder.emplace(logHandler->context, std::make_unique<RustLogHandlerBinding>(logHandler));
	prt::addLogHandler(handlerIt->second.get());
};

void ffi_remove_log_handler(AbstractLogHandlerBinding* logHandler) {
	auto it = logHandlerHolder.find(logHandler->context);
	if (it != logHandlerHolder.end()) {
		prt::removeLogHandler(it->second.get());
	}
	delete logHandler;
}

void RustLogHandlerBinding::handleLogEvent(const wchar_t* msg, prt::LogLevel /*level*/) {
	std::string nMsg = toUTF8FromUTF16(msg);
	(*mBinding->handle_log_event)(mBinding->context, nMsg.c_str());
}

const prt::LogLevel* RustLogHandlerBinding::getLevels(size_t* count) {
	*count = prt::LogHandler::ALL_COUNT;
	return prt::LogHandler::ALL;
}

void RustLogHandlerBinding::getFormat(bool* dateTime, bool* level) {
	*dateTime = false;
	*level = false;
}