mirror of
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208 lines
9.4 KiB
C++
208 lines
9.4 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2021 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#ifndef __OPENSPACE_MODULE_ATMOSPHERE___ATMOSPHEREDEFERREDCASTER___H__
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#define __OPENSPACE_MODULE_ATMOSPHERE___ATMOSPHEREDEFERREDCASTER___H__
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#include <openspace/rendering/deferredcaster.h>
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#include <modules/atmosphere/rendering/renderableatmosphere.h>
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#include <ghoul/glm.h>
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#include <ghoul/opengl/textureunit.h>
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#include <ghoul/opengl/uniformcache.h>
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#include <string>
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#include <vector>
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namespace ghoul::opengl {
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class Texture;
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class ProgramObject;
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} // namespace ghoul::opengl
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namespace openspace {
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struct RenderData;
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struct DeferredcastData;
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struct ShadowConfiguration;
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class AtmosphereDeferredcaster : public Deferredcaster {
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public:
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virtual ~AtmosphereDeferredcaster() = default;
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void initialize();
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void deinitialize();
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void preRaycast(const RenderData& renderData, const DeferredcastData& deferredData,
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ghoul::opengl::ProgramObject& program) override;
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void postRaycast(const RenderData& renderData, const DeferredcastData& deferredData,
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ghoul::opengl::ProgramObject& program) override;
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std::string deferredcastPath() const override;
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std::string deferredcastVSPath() const override;
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std::string deferredcastFSPath() const override;
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std::string helperPath() const override;
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void initializeCachedVariables(ghoul::opengl::ProgramObject&) override;
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void update(const UpdateData&) override;
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void preCalculateAtmosphereParam();
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void setModelTransform(const glm::dmat4 &transform);
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void setTime(double time);
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void setAtmosphereRadius(float atmRadius);
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void setPlanetRadius(float planetRadius);
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void setPlanetAverageGroundReflectance(float averageGReflectance);
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void setPlanetGroundRadianceEmittion(float groundRadianceEmittion);
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void setRayleighHeightScale(float rayleighHeightScale);
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void enableOzone(bool enable);
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void setOzoneHeightScale(float ozoneHeightScale);
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void setMieHeightScale(float mieHeightScale);
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void setMiePhaseConstant(float miePhaseConstant);
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void setSunRadianceIntensity(float sunRadiance);
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void setRayleighScatteringCoefficients(glm::vec3 rayScattCoeff);
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void setOzoneExtinctionCoefficients(glm::vec3 ozoneExtCoeff);
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void setMieScatteringCoefficients(glm::vec3 mieScattCoeff);
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void setMieExtinctionCoefficients(glm::vec3 mieExtCoeff);
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void setEllipsoidRadii(glm::dvec3 radii);
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void setShadowConfigArray(std::vector<ShadowConfiguration> shadowConfigArray);
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void setHardShadows(bool enabled);
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void enableSunFollowing(bool enable);
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void setPrecalculationTextureScale(float preCalculatedTexturesScale);
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void enablePrecalculationTexturesSaving();
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private:
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void loadComputationPrograms();
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void unloadComputationPrograms();
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void createComputationTextures();
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void deleteComputationTextures();
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void deleteUnusedComputationTextures();
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void executeCalculations(GLuint quadCalcVAO, GLenum drawBuffers[1],
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GLsizei vertexSize);
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void step3DTexture(std::unique_ptr<ghoul::opengl::ProgramObject>& shaderProg,
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int layer, bool doCalculation = true);
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void checkFrameBufferState(const std::string& codePosition) const;
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void loadAtmosphereDataIntoShaderProgram(
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std::unique_ptr<ghoul::opengl::ProgramObject> & shaderProg
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);
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void renderQuadForCalc(GLuint vao, GLsizei numberOfVertices);
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void saveTextureToPPMFile(GLenum color_buffer_attachment, const std::string& fileName,
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int width, int height) const;
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bool isAtmosphereInFrustum(const glm::dmat4& MVMatrix, const glm::dvec3& position,
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double radius) const;
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// Number of planet radii to use as distance threshold for culling
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const double DISTANCE_CULLING_RADII = 5000;
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std::unique_ptr<ghoul::opengl::ProgramObject> _transmittanceProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _irradianceProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _irradianceSupTermsProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _irradianceFinalProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _inScatteringProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _inScatteringSupTermsProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _deltaEProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _deltaSProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _deltaSSupTermsProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _deltaJProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _atmosphereProgramObject;
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std::unique_ptr<ghoul::opengl::ProgramObject> _deferredAtmosphereProgramObject;
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UniformCache(cullAtmosphere, Rg, Rt,
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groundRadianceEmittion, HR, betaRayleigh, HM,
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betaMieExtinction, mieG, sunRadiance, ozoneLayerEnabled,
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HO, betaOzoneExtinction, SAMPLES_R,
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SAMPLES_MU, SAMPLES_MU_S, SAMPLES_NU) _uniformCache;
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UniformCache(dInverseModelTransformMatrix, dModelTransformMatrix,
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dSgctProjectionToModelTransformMatrix,
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dSGCTViewToWorldMatrix, dCamPosObj, sunDirectionObj,
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hardShadows, transmittanceTexture, irradianceTexture,
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inscatterTexture) _uniformCache2;
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GLuint _transmittanceTableTexture = 0;
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GLuint _irradianceTableTexture = 0;
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GLuint _inScatteringTableTexture = 0;
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GLuint _deltaETableTexture = 0;
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GLuint _deltaSRayleighTableTexture = 0;
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GLuint _deltaSMieTableTexture = 0;
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GLuint _deltaJTableTexture = 0;
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GLuint _atmosphereTexture = 0;
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ghoul::opengl::TextureUnit _transmittanceTableTextureUnit;
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ghoul::opengl::TextureUnit _irradianceTableTextureUnit;
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ghoul::opengl::TextureUnit _inScatteringTableTextureUnit;
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// Atmosphere Data
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bool _atmosphereCalculated = false;
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bool _ozoneEnabled = false;
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bool _sunFollowingCameraEnabled = false;
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float _atmosphereRadius = 0.f;
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float _atmospherePlanetRadius = 0.f;
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float _planetAverageGroundReflectance = 0.f;
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float _planetGroundRadianceEmittion = 0.f;
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float _rayleighHeightScale = 0.f;
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float _ozoneHeightScale = 0.f;
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float _mieHeightScale = 0.f;
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float _miePhaseConstant = 0.f;
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float _sunRadianceIntensity = 5.f;
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glm::vec3 _rayleighScatteringCoeff = glm::vec3(0.f);
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glm::vec3 _ozoneExtinctionCoeff = glm::vec3(0.f);
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glm::vec3 _mieScatteringCoeff = glm::vec3(0.f);
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glm::vec3 _mieExtinctionCoeff = glm::vec3(0.f);
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glm::dvec3 _ellipsoidRadii = glm::vec3(0.f);
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// Atmosphere Textures Dimmensions
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int _transmittance_table_width = 256;
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int _transmittance_table_height = 64;
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int _irradiance_table_width = 64;
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int _irradiance_table_height = 16;
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int _delta_e_table_width = 64;
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int _delta_e_table_height = 16;
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int _r_samples = 32;
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int _mu_samples = 128;
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int _mu_s_samples = 32;
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int _nu_samples = 8;
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glm::dmat4 _modelTransform;
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double _time = 0.0;
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// Eclipse Shadows
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std::vector<ShadowConfiguration> _shadowConfArray;
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bool _hardShadowsEnabled = false;
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// Atmosphere Debugging
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float _calculationTextureScale = 1.f;
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bool _saveCalculationTextures = false;
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std::vector<ShadowRenderingStruct> _shadowDataArrayCache;
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// Assuming < 1000 shadow casters, the longest uniform name that we are getting is
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// shadowDataArray[999].casterPositionVec
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// which needs to fit into the uniform buffer
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char _uniformNameBuffer[40];
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};
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} // openspace
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#endif // __OPENSPACE_MODULE_ATMOSPHERE___ATMOSPHEREDEFERREDCASTER___H__
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