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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"
static const float4 ZeroVector4 = float4(0.0f, 0.0f, 0.0f, 0.0f);
void GL::LightHandler::Init(unsigned int cfgBaseLight, unsigned int cfgMaxLights) {
glGetIntegerv(GL_MAX_LIGHTS, reinterpret_cast<int*>(&maxLights));
baseLight = cfgBaseLight;
maxLights -= baseLight;
maxLights = std::min(maxLights, cfgMaxLights);
lights.resize(maxLights);
for (unsigned int i = 0; i < maxLights; i++) {
const unsigned int lightID = GL_LIGHT0 + baseLight + i;
glEnable(lightID);
glLightfv(lightID, GL_POSITION, &ZeroVector4.x);
glLightfv(lightID, GL_AMBIENT, &ZeroVector4.x);
glLightfv(lightID, GL_DIFFUSE, &ZeroVector4.x);
glLightfv(lightID, GL_SPECULAR, &ZeroVector4.x);
glLightfv(lightID, GL_SPOT_DIRECTION, &ZeroVector4.x);
glLightf(lightID, GL_SPOT_CUTOFF, 180.0f);
glLightf(lightID, GL_CONSTANT_ATTENUATION, 1.0f);
glLightf(lightID, GL_LINEAR_ATTENUATION, 0.0f);
glLightf(lightID, GL_QUADRATIC_ATTENUATION, 0.0f);
glDisable(lightID);
lights[i].SetID(lightID);
}
}
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(lights.begin(), lights.end(), [&](const GL::Light& lgt) { return (lgt.GetTTL() == 0); });
if (it == lights.end()) {
// 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 < lights.size(); n++) {
const GL::Light& lgt = lights[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 - lights.begin(), light));
}
unsigned int GL::LightHandler::SetLight(unsigned int lgtIndex, const GL::Light& light) {
const unsigned int lightID = lights[lgtIndex].GetID();
// clear any previous dependence this light might have
lights[lgtIndex].ClearDeathDependencies();
lights[lgtIndex] = light;
lights[lgtIndex].SetID(lightID);
lights[lgtIndex].SetUID(lightHandle++);
lights[lgtIndex].SetRelativeTime(0);
lights[lgtIndex].SetAbsoluteTime(gs->frameNum);
return (lights[lgtIndex].GetUID());
}
GL::Light* GL::LightHandler::GetLight(unsigned int lgtHandle) {
const auto it = std::find_if(lights.begin(), lights.end(), [&](const GL::Light& lgt) { return (lgt.GetUID() == lgtHandle); });
if (it != lights.end())
return &(*it);
return nullptr;
}
void GL::LightHandler::Update(Shader::IProgramObject* shader) {
if (lights.size() != numLights) {
numLights = lights.size();
// update the active light-count (note: unused, number of lights
// to iterate over needs to be known at shader compilation-time)
// shader->SetUniform1i(uniformIndex, numLights);
}
if (numLights == 0)
return;
// float3 sumWeight;
float3 maxWeight = OnesVector * 0.01f;
for (const GL::Light& light: lights) {
if (light.GetTTL() == 0)
continue;
// sumWeight += light.GetIntensityWeight();
maxWeight = float3::max(maxWeight, light.GetIntensityWeight());
}
for (GL::Light& light: lights) {
const unsigned int lightID = light.GetID();
// dead light, ignore (but kill its contribution)
if (light.GetTTL() == 0) {
glEnable(lightID);
glLightfv(lightID, GL_AMBIENT, &ZeroVector4.x);
glLightfv(lightID, GL_DIFFUSE, &ZeroVector4.x);
glLightfv(lightID, GL_SPECULAR, &ZeroVector4.x);
glDisable(lightID);
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;
const float3* lightTrackPos = light.GetTrackPosition();
const float3* lightTrackDir = light.GetTrackDirection();
const float4& lightPos = (lightTrackPos != nullptr)? float4(*lightTrackPos, 1.0f): light.GetPosition();
const float3& lightDir = (lightTrackDir != nullptr)? float3(*lightTrackDir ): light.GetDirection();
const bool lightVisible = (gu->spectatingFullView || light.GetIgnoreLOS() || losHandler->InLos(lightPos, gu->myAllyTeam));
if (light.GetRelativeTime() > light.GetTTL()) {
// mark light as dead
light.SetTTL(0);
} else {
// communicate properties via the FFP to save uniforms
// note: we want MV to be identity here
glEnable(lightID);
glLightfv(lightID, GL_POSITION, &lightPos.x);
if (lightVisible) {
glLightfv(lightID, GL_AMBIENT, &weightedAmbientCol.x);
glLightfv(lightID, GL_DIFFUSE, &weightedDiffuseCol.x);
glLightfv(lightID, GL_SPECULAR, &weightedSpecularCol.x);
} 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)
glLightfv(lightID, GL_AMBIENT, &ZeroVector4.x);
glLightfv(lightID, GL_DIFFUSE, &ZeroVector4.x);
glLightfv(lightID, GL_SPECULAR, &ZeroVector4.x);
}
glLightfv(lightID, GL_SPOT_DIRECTION, &lightDir.x);
glLightf(lightID, GL_SPOT_CUTOFF, light.GetFOV());
glLightf(lightID, GL_CONSTANT_ATTENUATION, light.GetRadius()); //!
#if (OGL_SPEC_ATTENUATION == 1)
glLightf(lightID, GL_CONSTANT_ATTENUATION, light.GetAttenuation().x);
glLightf(lightID, GL_LINEAR_ATTENUATION, light.GetAttenuation().y);
glLightf(lightID, GL_QUADRATIC_ATTENUATION, light.GetAttenuation().z);
#endif
glDisable(lightID);
}
}
}
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