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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "Wind.h"
#include "GlobalSynced.h"
#include "Sim/Units/Unit.h"
#include "Sim/Units/UnitHandler.h"
#include "System/ContainerUtil.h"
#include "System/SpringMath.h"
CR_BIND(EnvResourceHandler, )
CR_REG_METADATA(EnvResourceHandler, (
CR_MEMBER(curTidalStrength),
CR_MEMBER(curWindStrength),
CR_MEMBER(minWindStrength),
CR_MEMBER(maxWindStrength),
CR_MEMBER(curWindVec),
CR_MEMBER(curWindDir),
CR_MEMBER(newWindVec),
CR_MEMBER(oldWindVec),
CR_MEMBER(windDirTimer),
CR_MEMBER(allGeneratorIDs),
CR_MEMBER(newGeneratorIDs)
))
EnvResourceHandler envResHandler;
void EnvResourceHandler::ResetState()
{
curTidalStrength = 0.0f;
curWindStrength = 0.0f;
minWindStrength = 0.0f;
maxWindStrength = 100.0f;
curWindDir = RgtVector;
curWindVec = ZeroVector;
newWindVec = ZeroVector;
oldWindVec = ZeroVector;
windDirTimer = 0;
allGeneratorIDs.clear();
allGeneratorIDs.reserve(256);
newGeneratorIDs.clear();
newGeneratorIDs.reserve(256);
}
void EnvResourceHandler::LoadWind(float minStrength, float maxStrength)
{
minWindStrength = std::min(minStrength, maxStrength);
maxWindStrength = std::max(minStrength, maxStrength);
curWindVec = mix(curWindDir * GetAverageWindStrength(), RgtVector * GetAverageWindStrength(), curWindDir == RgtVector);
oldWindVec = curWindVec;
}
bool EnvResourceHandler::AddGenerator(CUnit* u) {
// duplicates should never happen, no need to check
return (spring::VectorInsertUnique(newGeneratorIDs, u->id));
}
bool EnvResourceHandler::DelGenerator(CUnit* u) {
// id is never present in both
return (spring::VectorErase(newGeneratorIDs, u->id) || spring::VectorErase(allGeneratorIDs, u->id));
}
void EnvResourceHandler::Update()
{
// zero-strength wind does not need updates
if (maxWindStrength <= 0.0f)
return;
if (windDirTimer == 0) {
oldWindVec = curWindVec;
newWindVec = oldWindVec;
// generate new wind direction
float newStrength = 0.0f;
do {
newWindVec.x -= (gsRNG.NextFloat() - 0.5f) * maxWindStrength;
newWindVec.z -= (gsRNG.NextFloat() - 0.5f) * maxWindStrength;
newStrength = newWindVec.Length();
} while (newStrength == 0.0f);
// normalize and clamp s.t. minWindStrength <= strength <= maxWindStrength
newWindVec /= newStrength;
newWindVec *= (newStrength = Clamp(newStrength, minWindStrength, maxWindStrength));
// update generators
for (const int unitID: allGeneratorIDs) {
(unitHandler.GetUnit(unitID))->UpdateWind(newWindVec.x, newWindVec.z, newStrength);
}
} else {
const float mod = smoothstep(0.0f, 1.0f, windDirTimer / float(WIND_UPDATE_RATE));
// blend between old & new wind directions
// note: generators added on simframes when timer is 0
// do not receive a snapshot of the blended direction
curWindVec = mix(oldWindVec, newWindVec, mod);
curWindStrength = curWindVec.LengthNormalize();
curWindDir = curWindVec;
curWindVec = curWindDir * (curWindStrength = Clamp(curWindStrength, minWindStrength, maxWindStrength));
for (const int unitID: newGeneratorIDs) {
// make newly added generators point in direction of wind
(unitHandler.GetUnit(unitID))->UpdateWind(curWindDir.x, curWindDir.z, curWindStrength);
allGeneratorIDs.push_back(unitID);
}
newGeneratorIDs.clear();
}
windDirTimer = (windDirTimer + 1) % (WIND_UPDATE_RATE + 1);
}
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