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openmw/components/sceneutil/shadow.cpp

144 lines
6.2 KiB
C++

#include "shadow.hpp"
#include <osgShadow/ShadowedScene>
#include <osg/CullFace>
#include <osg/Geode>
#include <osg/io_utils>
#include <osgDB/FileUtils>
#include <osgDB/ReadFile>
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#include <components/settings/settings.hpp>
namespace SceneUtil
{
using namespace osgShadow;
void ShadowManager::setupShadowSettings()
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{
mEnableShadows = Settings::Manager::getBool("enable shadows", "Shadows");
if (!mEnableShadows)
{
mShadowTechnique->disableShadows();
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return;
}
mShadowTechnique->enableShadows();
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mShadowSettings->setLightNum(0);
mShadowSettings->setReceivesShadowTraversalMask(~0u);
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int numberOfShadowMapsPerLight = Settings::Manager::getInt("number of shadow maps", "Shadows");
mShadowSettings->setNumShadowMapsPerLight(numberOfShadowMapsPerLight);
mShadowSettings->setBaseShadowTextureUnit(8 - numberOfShadowMapsPerLight);
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mShadowSettings->setMinimumShadowMapNearFarRatio(Settings::Manager::getFloat("minimum lispsm near far ratio", "Shadows"));
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if (Settings::Manager::getBool("compute tight scene bounds", "Shadows"))
mShadowSettings->setComputeNearFarModeOverride(osg::CullSettings::COMPUTE_NEAR_FAR_USING_PRIMITIVES);
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int mapres = Settings::Manager::getInt("shadow map resolution", "Shadows");
mShadowSettings->setTextureSize(osg::Vec2s(mapres, mapres));
mShadowTechnique->setSplitPointUniformLogarithmicRatio(Settings::Manager::getFloat("split point uniform logarithmic ratio", "Shadows"));
mShadowTechnique->setSplitPointDeltaBias(Settings::Manager::getFloat("split point bias", "Shadows"));
if (Settings::Manager::getBool("allow shadow map overlap", "Shadows"))
mShadowSettings->setMultipleShadowMapHint(osgShadow::ShadowSettings::CASCADED);
else
mShadowSettings->setMultipleShadowMapHint(osgShadow::ShadowSettings::PARALLEL_SPLIT);
if (Settings::Manager::getBool("enable debug hud", "Shadows"))
mShadowTechnique->enableDebugHUD();
else
mShadowTechnique->disableDebugHUD();
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}
void ShadowManager::disableShadowsForStateSet(osg::ref_ptr<osg::StateSet> stateset)
{
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int numberOfShadowMapsPerLight = Settings::Manager::getInt("number of shadow maps", "Shadows");
int baseShadowTextureUnit = 8 - numberOfShadowMapsPerLight;
osg::ref_ptr<osg::Image> fakeShadowMapImage = new osg::Image();
fakeShadowMapImage->allocateImage(1, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT);
*(float*)fakeShadowMapImage->data() = std::numeric_limits<float>::infinity();
osg::ref_ptr<osg::Texture> fakeShadowMapTexture = new osg::Texture2D(fakeShadowMapImage);
fakeShadowMapTexture->setShadowComparison(true);
fakeShadowMapTexture->setShadowCompareFunc(osg::Texture::ShadowCompareFunc::ALWAYS);
for (int i = baseShadowTextureUnit; i < baseShadowTextureUnit + numberOfShadowMapsPerLight; ++i)
{
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stateset->setTextureAttributeAndModes(i, fakeShadowMapTexture, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE | osg::StateAttribute::PROTECTED);
stateset->addUniform(new osg::Uniform(("shadowTexture" + std::to_string(i - baseShadowTextureUnit)).c_str(), i));
stateset->addUniform(new osg::Uniform(("shadowTextureUnit" + std::to_string(i - baseShadowTextureUnit)).c_str(), i));
}
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}
ShadowManager::ShadowManager(osg::ref_ptr<osg::Group> sceneRoot, osg::ref_ptr<osg::Group> rootNode, unsigned int outdoorShadowCastingMask, unsigned int indoorShadowCastingMask, Shader::ShaderManager &shaderManager) : mShadowedScene(new osgShadow::ShadowedScene),
mShadowTechnique(new MWShadowTechnique),
mOutdoorShadowCastingMask(outdoorShadowCastingMask),
mIndoorShadowCastingMask(indoorShadowCastingMask)
{
mShadowedScene->setShadowTechnique(mShadowTechnique);
mShadowedScene->addChild(sceneRoot);
rootNode->addChild(mShadowedScene);
mShadowSettings = mShadowedScene->getShadowSettings();
setupShadowSettings();
mShadowTechnique->setupCastingShader(shaderManager);
enableOutdoorMode();
}
Shader::ShaderManager::DefineMap ShadowManager::getShadowDefines()
{
if (!mEnableShadows)
return getShadowsDisabledDefines();
Shader::ShaderManager::DefineMap definesWithShadows;
definesWithShadows.insert(std::make_pair(std::string("shadows_enabled"), std::string("1")));
for (unsigned int i = 0; i < mShadowSettings->getNumShadowMapsPerLight(); ++i)
definesWithShadows["shadow_texture_unit_list"] += std::to_string(i) + ",";
// remove extra comma
definesWithShadows["shadow_texture_unit_list"] = definesWithShadows["shadow_texture_unit_list"].substr(0, definesWithShadows["shadow_texture_unit_list"].length() - 1);
if (Settings::Manager::getBool("allow shadow map overlap", "Shadows"))
definesWithShadows["shadowMapsOverlap"] = "1";
else
definesWithShadows["shadowMapsOverlap"] = "0";
if (Settings::Manager::getBool("enable debug overlay", "Shadows"))
definesWithShadows["useShadowDebugOverlay"] = "1";
else
definesWithShadows["useShadowDebugOverlay"] = "0";
return definesWithShadows;
}
Shader::ShaderManager::DefineMap ShadowManager::getShadowsDisabledDefines()
{
Shader::ShaderManager::DefineMap definesWithShadows;
definesWithShadows.insert(std::make_pair(std::string("shadows_enabled"), std::string("0")));
definesWithShadows["shadow_texture_unit_list"] = "";
definesWithShadows["shadowMapsOverlap"] = "0";
definesWithShadows["useShadowDebugOverlay"] = "0";
return definesWithShadows;
}
void ShadowManager::enableIndoorMode()
{
if (Settings::Manager::getBool("enable indoor shadows", "Shadows"))
mShadowSettings->setCastsShadowTraversalMask(mIndoorShadowCastingMask);
else
mShadowTechnique->disableShadows();
}
void ShadowManager::enableOutdoorMode()
{
if (mEnableShadows)
mShadowTechnique->enableShadows();
mShadowSettings->setCastsShadowTraversalMask(mOutdoorShadowCastingMask);
}
}