dynamicshadows.h

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/*
Minetest
Copyright (C) 2021 Liso <anlismon@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
#pragma once
 
#include "irrlichttypes_bloated.h"
#include <matrix4.h>
#include "util/basic_macros.h"
#include "constants.h"
 
class Camera;
class Client;
 
struct shadowFrustum
{
        f32 zNear{0.0f};
        f32 zFar{0.0f};
        f32 length{0.0f};
        f32 radius{0.0f};
        core::matrix4 ProjOrthMat;
        core::matrix4 ViewMat;
        v3f position;
        v3f player;
        v3s16 camera_offset;
};
 
class DirectionalLight
{
public:
        DirectionalLight(const u32 shadowMapResolution,
                        const v3f &position,
                        video::SColorf lightColor = video::SColor(0xffffffff),
                        f32 farValue = 100.0f);
        ~DirectionalLight() = default;
 
        //DISABLE_CLASS_COPY(DirectionalLight)
 
        void update_frustum(const Camera *cam, Client *client, bool force = false);
 
        // when set direction is updated to negative normalized(direction)
        void setDirection(v3f dir);
        v3f getDirection() const{
                return direction;
        };
        v3f getPosition() const;
        v3f getPlayerPos() const;
        v3f getFuturePlayerPos() const;
 
        const core::matrix4 &getViewMatrix() const;
        const core::matrix4 &getProjectionMatrix() const;
        const core::matrix4 &getFutureViewMatrix() const;
        const core::matrix4 &getFutureProjectionMatrix() const;
        core::matrix4 getViewProjMatrix();
 
        f32 getMaxFarValue() const
        {
                return farPlane * BS;
        }
 
        f32 getFarValue() const
        {
                return shadow_frustum.zFar;
        }
 
 
        const video::SColorf &getLightColor() const
        {
                return diffuseColor;
        }
 
        void setLightColor(const video::SColorf &lightColor)
        {
                diffuseColor = lightColor;
        }
 
        u32 getMapResolution() const
        {
                return mapRes;
        }
 
        bool should_update_map_shadow{true};
 
        void commitFrustum();
 
private:
        void createSplitMatrices(const Camera *cam);
 
        video::SColorf diffuseColor;
 
        f32 farPlane;
        u32 mapRes;
 
        v3f pos;
        v3f direction{0};
 
        v3f last_cam_pos_world{0,0,0};
        v3f last_look{0,1,0};
 
        shadowFrustum shadow_frustum;
        shadowFrustum future_frustum;
        bool dirty{false};
};