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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "myGL.h"
#include "LightHandler.h"
#include "Game/GlobalUnsynced.h"
#include "Rendering/Shaders/Shader.h"
#include "Sim/Misc/GlobalSynced.h"
#include "Sim/Misc/LosHandler.h"
#include "Sim/Projectiles/Projectile.h"
void GL::LightHandler::Init(unsigned int cfgMaxLights) {
maxLights = std::min(MaxConfigLights(), cfgMaxLights);
for (unsigned int i = 0; i < maxLights; i++) {
glLights[i].SetID(GL_LIGHT0 + i);
}
}
unsigned int GL::LightHandler::AddLight(const GL::Light& light) {
if (light.GetTTL() == 0 || light.GetRadius() <= 0.0f)
return -1u;
if ((light.GetIntensityWeight()).SqLength() <= 0.01f)
return -1u;
const auto it = std::find_if(glLights.begin(), glLights.end(), [&](const GL::Light& lgt) { return (lgt.GetTTL() == 0); });
if (it == glLights.end()) {
// if all are claimed, find the lowest-priority light we can evict
unsigned int minPriorityValue = light.GetPriority();
unsigned int minPriorityIndex = -1u;
for (unsigned int n = 0; n < glLights.size(); n++) {
const GL::Light& lgt = glLights[n];
if (lgt.GetPriority() < minPriorityValue) {
minPriorityValue = lgt.GetPriority();
minPriorityIndex = n;
}
}
if (minPriorityIndex != -1u)
return (SetLight(minPriorityIndex, light));
// no available light to replace
return -1u;
}
return (SetLight(it - glLights.begin(), light));
}
unsigned int GL::LightHandler::SetLight(unsigned int lgtIndex, const GL::Light& light) {
const unsigned int lightID = glLights[lgtIndex].GetID();
// clear any previous dependence this light might have
glLights[lgtIndex].ClearDeathDependencies();
glLights[lgtIndex] = light;
glLights[lgtIndex].SetID(lightID);
glLights[lgtIndex].SetUID(lightHandle++);
glLights[lgtIndex].SetRelativeTime(0);
glLights[lgtIndex].SetAbsoluteTime(gs->frameNum);
memset(GetRawLightDataPtr(lgtIndex), 0, sizeof(RawLight));
return (glLights[lgtIndex].GetUID());
}
GL::Light* GL::LightHandler::GetLight(unsigned int lgtHandle) {
const auto pred = [&](const GL::Light& lgt) { return (lgt.GetUID() == lgtHandle); };
const auto iter = std::find_if(glLights.begin(), glLights.end(), pred);
if (iter != glLights.end())
return &(*iter);
return nullptr;
}
void GL::LightHandler::Update() {
assert(maxLights != 0);
// float3 sumWeight;
float3 maxWeight = OnesVector * 0.01f;
for (const GL::Light& light: glLights) {
if (light.GetTTL() == 0)
continue;
// sumWeight += light.GetIntensityWeight();
maxWeight = float3::max(maxWeight, light.GetIntensityWeight());
}
for (unsigned int i = 0; i < maxLights; i++) {
GL::Light& light = glLights[i];
// dead light, ignore (but kill its contribution)
if (light.GetTTL() == 0) {
memset(GetRawLightDataPtr(i), 0, sizeof(RawLight));
continue;
}
if (light.GetAbsoluteTime() != gs->frameNum) {
light.SetRelativeTime(light.GetRelativeTime() + 1);
light.SetAbsoluteTime(gs->frameNum);
light.DecayColors();
light.ClampColors();
}
// rescale by max (not sum!), otherwise 1) the intensity would
// change if any light is added or removed when all have equal
// weight and 2) a non-uniform set would cause a reduction for
// all
const float3 weight = light.GetIntensityWeight() / maxWeight;
const float4 weightedAmbientCol = light.GetAmbientColor() * weight.x;
const float4 weightedDiffuseCol = light.GetDiffuseColor() * weight.y;
const float4 weightedSpecularCol = light.GetSpecularColor() * weight.z;
float4 lightPos = light.GetPosition();
float4 lightDir = light.GetDirection(); // w=0, make sure to pick mat::oper*(float4)
if (light.GetTrackObject() != nullptr) {
switch (light.GetTrackType()) {
case GL::Light::TRACK_TYPE_UNIT: {
const CSolidObject* so = static_cast<const CSolidObject*>(light.GetTrackObject());
if (light.LocalSpace()) {
lightPos = so->GetObjectSpaceDrawPos(lightPos);
lightDir = so->GetObjectSpaceVec(lightDir);
} else {
lightPos = so->drawPos;
lightDir = so->frontdir;
}
} break;
case GL::Light::TRACK_TYPE_PROJ: {
const CProjectile* po = static_cast<const CProjectile*>(light.GetTrackObject());
if (light.LocalSpace()) {
const CMatrix44f m = po->GetTransformMatrix();
lightPos = m * lightPos;
lightDir = m * lightDir;
} else {
lightPos = po->drawPos;
lightDir = po->dir;
}
} break;
default: {} break;
}
}
if (light.GetRelativeTime() > light.GetTTL()) {
// mark light as dead
light.SetTTL(0);
continue;
}
rawLights[i].worldPos = lightPos;
rawLights[i].worldDir = lightDir;
if (gu->spectatingFullView || light.IgnoreLOS() || losHandler->InLos(lightPos, gu->myAllyTeam)) {
// light is visible
rawLights[i].diffColor = weightedDiffuseCol;
rawLights[i].specColor = weightedSpecularCol;
rawLights[i].ambiColor = weightedAmbientCol;
} else {
// zero contribution from this light if not in LOS
// (whether or not camera can see it is irrelevant
// since the light always takes up a slot anyway)
memset(GetRawLightDataPtr(i), 0, sizeof(RawLight));
}
#if (OGL_SPEC_ATTENUATION == 1)
rawLights[i].fovRadius = {light.GetFOV(), light.GetAttenuation()};
#else
rawLights[i].fovRadius = {light.GetFOV(), light.GetRadius(), light.GetRadius(), light.GetRadius()};
#endif
}
}
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