mirror of https://github.com/minetest/minetest.git
183 lines
5.5 KiB
C++
183 lines
5.5 KiB
C++
/*
|
|
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.
|
|
*/
|
|
|
|
#include <cmath>
|
|
|
|
#include "client/shadows/dynamicshadows.h"
|
|
#include "client/client.h"
|
|
#include "client/clientenvironment.h"
|
|
#include "client/clientmap.h"
|
|
#include "client/camera.h"
|
|
|
|
using m4f = core::matrix4;
|
|
|
|
void DirectionalLight::createSplitMatrices(const Camera *cam)
|
|
{
|
|
float radius;
|
|
v3f newCenter;
|
|
v3f look = cam->getDirection();
|
|
|
|
// camera view tangents
|
|
float tanFovY = tanf(cam->getFovY() * 0.5f);
|
|
float tanFovX = tanf(cam->getFovX() * 0.5f);
|
|
|
|
// adjusted frustum boundaries
|
|
float sfNear = future_frustum.zNear;
|
|
float sfFar = adjustDist(future_frustum.zFar, cam->getFovY());
|
|
|
|
// adjusted camera positions
|
|
v3f camPos2 = cam->getPosition();
|
|
v3f camPos = v3f(camPos2.X - cam->getOffset().X * BS,
|
|
camPos2.Y - cam->getOffset().Y * BS,
|
|
camPos2.Z - cam->getOffset().Z * BS);
|
|
camPos += look * sfNear;
|
|
camPos2 += look * sfNear;
|
|
|
|
// center point of light frustum
|
|
float end = sfNear + sfFar;
|
|
newCenter = camPos + look * (sfNear + 0.05f * end);
|
|
v3f world_center = camPos2 + look * (sfNear + 0.05f * end);
|
|
|
|
// Create a vector to the frustum far corner
|
|
const v3f &viewUp = cam->getCameraNode()->getUpVector();
|
|
v3f viewRight = look.crossProduct(viewUp);
|
|
|
|
v3f farCorner = look + viewRight * tanFovX + viewUp * tanFovY;
|
|
// Compute the frustumBoundingSphere radius
|
|
v3f boundVec = (camPos + farCorner * sfFar) - newCenter;
|
|
radius = boundVec.getLength() * 2.0f;
|
|
// boundVec.getLength();
|
|
float vvolume = radius * 2.0f;
|
|
|
|
float texelsPerUnit = getMapResolution() / vvolume;
|
|
m4f mTexelScaling;
|
|
mTexelScaling.setScale(texelsPerUnit);
|
|
|
|
m4f mLookAt, mLookAtInv;
|
|
|
|
mLookAt.buildCameraLookAtMatrixLH(v3f(0.0f, 0.0f, 0.0f), -direction, v3f(0.0f, 1.0f, 0.0f));
|
|
|
|
mLookAt *= mTexelScaling;
|
|
mLookAtInv = mLookAt;
|
|
mLookAtInv.makeInverse();
|
|
|
|
v3f frustumCenter = newCenter;
|
|
mLookAt.transformVect(frustumCenter);
|
|
frustumCenter.X = floorf(frustumCenter.X); // clamp to texel increment
|
|
frustumCenter.Y = floorf(frustumCenter.Y); // clamp to texel increment
|
|
frustumCenter.Z = floorf(frustumCenter.Z);
|
|
mLookAtInv.transformVect(frustumCenter);
|
|
// probar radius multipliacdor en funcion del I, a menor I mas multiplicador
|
|
v3f eye_displacement = direction * vvolume;
|
|
|
|
// we must compute the viewmat with the position - the camera offset
|
|
// but the future_frustum position must be the actual world position
|
|
v3f eye = frustumCenter - eye_displacement;
|
|
future_frustum.position = world_center - eye_displacement;
|
|
future_frustum.length = vvolume;
|
|
future_frustum.ViewMat.buildCameraLookAtMatrixLH(eye, frustumCenter, v3f(0.0f, 1.0f, 0.0f));
|
|
future_frustum.ProjOrthMat.buildProjectionMatrixOrthoLH(future_frustum.length,
|
|
future_frustum.length, -future_frustum.length,
|
|
future_frustum.length,false);
|
|
future_frustum.camera_offset = cam->getOffset();
|
|
}
|
|
|
|
DirectionalLight::DirectionalLight(const u32 shadowMapResolution,
|
|
const v3f &position, video::SColorf lightColor,
|
|
f32 farValue) :
|
|
diffuseColor(lightColor),
|
|
farPlane(farValue), mapRes(shadowMapResolution), pos(position)
|
|
{}
|
|
|
|
void DirectionalLight::update_frustum(const Camera *cam, Client *client, bool force)
|
|
{
|
|
if (dirty && !force)
|
|
return;
|
|
|
|
float zNear = cam->getCameraNode()->getNearValue();
|
|
float zFar = getMaxFarValue();
|
|
|
|
///////////////////////////////////
|
|
// update splits near and fars
|
|
future_frustum.zNear = zNear;
|
|
future_frustum.zFar = zFar;
|
|
|
|
// update shadow frustum
|
|
createSplitMatrices(cam);
|
|
// get the draw list for shadows
|
|
client->getEnv().getClientMap().updateDrawListShadow(
|
|
getPosition(), getDirection(), future_frustum.length);
|
|
should_update_map_shadow = true;
|
|
dirty = true;
|
|
|
|
// when camera offset changes, adjust the current frustum view matrix to avoid flicker
|
|
v3s16 cam_offset = cam->getOffset();
|
|
if (cam_offset != shadow_frustum.camera_offset) {
|
|
v3f rotated_offset;
|
|
shadow_frustum.ViewMat.rotateVect(rotated_offset, intToFloat(cam_offset - shadow_frustum.camera_offset, BS));
|
|
shadow_frustum.ViewMat.setTranslation(shadow_frustum.ViewMat.getTranslation() + rotated_offset);
|
|
shadow_frustum.camera_offset = cam_offset;
|
|
}
|
|
}
|
|
|
|
void DirectionalLight::commitFrustum()
|
|
{
|
|
if (!dirty)
|
|
return;
|
|
|
|
shadow_frustum = future_frustum;
|
|
dirty = false;
|
|
}
|
|
|
|
void DirectionalLight::setDirection(v3f dir)
|
|
{
|
|
direction = -dir;
|
|
direction.normalize();
|
|
}
|
|
|
|
v3f DirectionalLight::getPosition() const
|
|
{
|
|
return shadow_frustum.position;
|
|
}
|
|
|
|
const m4f &DirectionalLight::getViewMatrix() const
|
|
{
|
|
return shadow_frustum.ViewMat;
|
|
}
|
|
|
|
const m4f &DirectionalLight::getProjectionMatrix() const
|
|
{
|
|
return shadow_frustum.ProjOrthMat;
|
|
}
|
|
|
|
const m4f &DirectionalLight::getFutureViewMatrix() const
|
|
{
|
|
return future_frustum.ViewMat;
|
|
}
|
|
|
|
const m4f &DirectionalLight::getFutureProjectionMatrix() const
|
|
{
|
|
return future_frustum.ProjOrthMat;
|
|
}
|
|
|
|
m4f DirectionalLight::getViewProjMatrix()
|
|
{
|
|
return shadow_frustum.ProjOrthMat * shadow_frustum.ViewMat;
|
|
}
|