void VShadowMapGenSpotDir::Update(bool force)
{
VisContextCamera_cl *pMainCam = m_pRendererNode->GetReferenceContext()->GetCamera();
VASSERT(pMainCam);
float fCamAngle = hkvMath::Abs (hkvMath::acosDeg (pMainCam->GetDirection().dot (m_vLastCameraDir)));
hkvVec3 vCamMove = pMainCam->GetPosition() - m_vLastCameraPos;
m_pRendererNode->GetReferenceContext()->GetViewFrustum(m_MainViewFrustum);
float fFovX, fFovY;
m_pRendererNode->GetReferenceContext()->GetFinalFOV(fFovX, fFovY);
float fNear, fFar;
m_pRendererNode->GetReferenceContext()->GetClipPlanes(fNear, fFar);
VBaseShadowMapComponentSpotDirectional* pComponent = static_cast<VBaseShadowMapComponentSpotDirectional*>(m_pShadowComponent);
if (m_eProjectionType == SHADOW_PROJECTION_ORTHOGRAPHIC)
{
bool bOverestimateCascades = pComponent->GetOverestimateCascades() ? true : false;
if (bOverestimateCascades)
{
if (m_fFovX != fFovX || m_fFovY != fFovY || m_fNear != fNear)
{
// In case user switches the FOV at runtime we need to update it here
float fStartDistance = fNear;
for (int iCascade = 0; iCascade < m_iNumParts; iCascade++)
{
float fEndDistance = pComponent->GetCascadeRange(iCascade) + fNear;
m_pParts[iCascade].ComputeOffset(fStartDistance, fEndDistance);
fStartDistance = fEndDistance;
}
m_fFovX = fFovX;
m_fFovY = fFovY;
m_fNear = fNear;
force = true;
}
if (force || m_vLastLightPos != m_pLightSource->GetPosition() ||
m_vLastLightDir != m_pLightSource->GetDirection() ||
vCamMove.getLength() > pComponent->GetShadowMapCameraUpdateInterval() ||
fCamAngle > pComponent->GetShadowMapCameraUpdateAngle())
{
for (int iCascade = 0; iCascade < m_iNumParts; iCascade++)
{
VShadowMapPart& part = m_pParts[iCascade];
VisContextCamera_cl* pCam = part.GetRenderContext()->GetCamera();
VisContextCamera_cl *pReferenceCam = m_pRendererNode->GetReferenceContext()->GetCamera();
hkvVec3 vCascadeCenter = pReferenceCam->GetPosition() + pReferenceCam->GetDirection() * part.m_fCenterOffset;
pCam->SetDirection(GetDirection());
float fRadius = part.m_fRadius + pComponent->GetShadowMapCameraUpdateInterval();
float fCameraDistanceFromCenter = fFar;
hkvVec3 vCamPos = vCascadeCenter - GetDirection() * fCameraDistanceFromCenter;
pCam->SetPosition(vCamPos);
//snapping
hkvVec3 offset = pCam->GetWorldToCameraTransformation().getColumn(3).getAsVec3();
float fPixelSize = (fRadius * 2) / (float)m_pShadowComponent->GetShadowMapSize();
offset.x -= floorf(offset.x / fPixelSize) * fPixelSize;
offset.y -= floorf(offset.y / fPixelSize) * fPixelSize;
vCamPos -= pCam->GetObjDir_Right() * offset.x - pCam->GetObjDir_Up() * offset.y;
pCam->SetPosition(vCamPos);
// Set far clip plane so that we have z = 1 at the far side of the sphere - the shader expects this when using the BoundingBox cascade selection method.
part.GetRenderContext()->SetClipPlanes(0.0f, fCameraDistanceFromCenter + fRadius);
part.GetRenderContext()->SetOrthographicSize(fRadius * 2, fRadius * 2);
part.Update();
}
m_vLastLightPos = m_pLightSource->GetPosition();
m_vLastLightDir = m_pLightSource->GetDirection();
m_vLastCameraPos = pMainCam->GetPosition();
m_vLastCameraDir = pMainCam->GetDirection();
}
}
else
{
float fStartDistance = 0.0f;
for (int iCascade = 0; iCascade < m_iNumParts; iCascade++)
{
VShadowMapPart& part = m_pParts[iCascade];
VisContextCamera_cl* pCam = part.GetRenderContext()->GetCamera();
// TODO: Performance
// Compute the extremes of the view frustum fragment for this cascade
hkvVec3 vCorners[8];
float fEndDistance = pComponent->GetCascadeRange(iCascade);
part.m_fCullDistance = fEndDistance;
part.GetViewFrustumCornersAtDistance(m_pRendererNode->GetReferenceContext(), fStartDistance, &vCorners[0]);
part.GetViewFrustumCornersAtDistance(m_pRendererNode->GetReferenceContext(), fEndDistance, &vCorners[4]);
fStartDistance = fEndDistance;
pCam->SetDirection(GetDirection());
float fMinRight = FLT_MAX;
float fMinUp = FLT_MAX;
float fMaxRight = -FLT_MAX;
float fMaxUp = -FLT_MAX;
float fMinDist = FLT_MAX;
float fMaxDist = -FLT_MAX;
for (int iCorner = 0; iCorner < 8; iCorner ++ )
{
float fRight = pCam->GetObjDir_Right().dot (vCorners[iCorner]);
if (fRight < fMinRight)
fMinRight = fRight;
if (fRight > fMaxRight)
fMaxRight = fRight;
float fUp = pCam->GetObjDir_Up().dot (vCorners[iCorner]);
if (fUp < fMinUp)
fMinUp = fUp;
if (fUp > fMaxUp)
fMaxUp = fUp;
float fDist = pCam->GetDirection().dot (vCorners[iCorner]);
if (fDist < fMinDist)
fMinDist = fDist;
if (fDist > fMaxDist)
fMaxDist = fDist;
}
// Since we need to take geometry into account which lies in front of the view frustum, we need to
// offset the near clip plane (in this case, the camera position) away from the view frustum
fMinDist -= (fFar - fNear);
hkvVec3 vCamPos = pCam->GetObjDir_Right() * ((fMinRight + fMaxRight)*0.5f)
+ pCam->GetObjDir_Up() * ((fMinUp + fMaxUp)*0.5f)
+ pCam->GetDirection() * fMinDist;
float fPadding = pComponent->GetShadowMapCameraUpdateInterval();
pCam->SetPosition(vCamPos);
part.GetRenderContext()->SetClipPlanes(0.0f, fMaxDist - fMinDist);
part.GetRenderContext()->SetOrthographicSize(fMaxRight - fMinRight + fPadding, fMaxUp - fMinUp + fPadding);
part.Update();
}
}
}
else if (m_eProjectionType == SHADOW_PROJECTION_PERSPECTIVE)
{
if (m_pLightSource->GetRadius() <= 0) //this is the case if triggered is set to false for the light
{
return; //do render the light at all
}
if (force || m_vLastLightPos != m_pLightSource->GetPosition() || m_vLastLightDir != m_pLightSource->GetDirection() ||
m_fLastRadius != m_pLightSource->GetRadius() || m_fLastAngle != m_pLightSource->GetProjectionAngle())
{
VShadowMapPart& part = m_pParts[0];
VisContextCamera_cl* pCam = part.GetRenderContext()->GetCamera();
pCam->SetDirection(GetDirection());
pCam->SetPosition(GetPosition());
part.GetRenderContext()->SetClipPlanes(m_pShadowComponent->GetNearClip(), m_pLightSource->GetRadius());
float fAngle = m_pLightSource->GetProjectionAngle();
part.GetRenderContext()->SetFOV(fAngle, fAngle);
part.Update();
m_vLastLightPos = m_pLightSource->GetPosition();
m_vLastLightDir = m_pLightSource->GetDirection();
m_fLastRadius = m_pLightSource->GetRadius();
m_fLastAngle = fAngle;
}
}
m_iPartsRendered = 0;
}
