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72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
#pragma once
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#include "gl/vao.h"
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#include "gl/shader.h"
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#include "gl/buffer.h"
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#include <memory>
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// sky gradient based on "A practical analytic model for daylight"
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// by A. J. Preetham Peter Shirley Brian Smits (University of Utah)
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class CSkyDome {
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public:
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CSkyDome( int const Tesselation = 54 );
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~CSkyDome();
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void Generate();
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void RebuildColors();
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bool SetSunPosition( glm::vec3 const &Direction );
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void SetTurbidity( const float Turbidity = 5.0f );
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void SetExposure( const bool Linearexposure, const float Expfactor );
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void SetOvercastFactor( const float Overcast = 0.0f );
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void SetGammaCorrection( const float Gamma = 2.2f );
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// update skydome
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void Update( glm::vec3 const &Sun );
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// render skydome to screen
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void Render();
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// retrieves average colour of the sky dome
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glm::vec3 GetAverageColor() { return m_averagecolour * 8.f / 6.f; }
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glm::vec3 GetAverageHorizonColor() { return m_averagehorizoncolour; }
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private:
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// shading parametrs
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glm::vec3 m_sundirection;
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float m_thetasun, m_phisun;
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float m_turbidity;
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bool m_linearexpcontrol;
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float m_expfactor;
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float m_overcast;
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float m_gammacorrection;
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glm::vec3 m_averagecolour;
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glm::vec3 m_averagehorizoncolour;
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// data
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int const m_tesselation;
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std::vector<glm::vec3> m_vertices;
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std::vector<std::uint16_t> m_indices;
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// std::vector<float3> m_normals;
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std::vector<glm::vec3> m_colours;
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static float m_distributionluminance[ 5 ][ 2 ];
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static float m_distributionxcomp[ 5 ][ 2 ];
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static float m_distributionycomp[ 5 ][ 2 ];
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static float m_zenithxmatrix[ 3 ][ 4 ];
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static float m_zenithymatrix[ 3 ][ 4 ];
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// coloring
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void GetPerez( float *Perez, float Distribution[ 5 ][ 2 ], const float Turbidity );
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float GetZenith( float Zenithmatrix[ 3 ][ 4 ], const float Theta, const float Turbidity );
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float PerezFunctionO1( float Perezcoeffs[ 5 ], const float Thetasun, const float Zenithval );
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float PerezFunctionO2( float Perezcoeffs[ 5 ], const float Icostheta, const float Gamma, const float Cosgamma2, const float Zenithval );
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std::optional<gl::buffer> m_vertexbuffer;
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std::optional<gl::buffer> m_indexbuffer;
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std::optional<gl::buffer> m_coloursbuffer;
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std::optional<gl::program> m_shader;
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std::optional<gl::vao> m_vao;
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};
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