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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;
/// Gets the light's matrices.
const core::matrix4 &getViewMatrix() const;
const core::matrix4 &getProjectionMatrix() const;
const core::matrix4 &getFutureViewMatrix() const;
const core::matrix4 &getFutureProjectionMatrix() const;
core::matrix4 getViewProjMatrix();
/// Gets the light's maximum far value, i.e. the shadow boundary
f32 getMaxFarValue() const
{
return farPlane * BS;
}
/// Gets the current far value of the light
f32 getFarValue() const
{
return shadow_frustum.zFar;
}
/// Gets the light's color.
const video::SColorf &getLightColor() const
{
return diffuseColor;
}
/// Sets the light's color.
void setLightColor(const video::SColorf &lightColor)
{
diffuseColor = lightColor;
}
/// Gets the shadow map resolution for this light.
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};
shadowFrustum shadow_frustum;
shadowFrustum future_frustum;
bool dirty{false};
};
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