/// update all internal data
//////////////////////////////////////////////////////////////////////////
bool CScaler::UpdateInternalsAndGetVisibility()
{
VisRenderContext_cl* pCtx = Vision::Contexts.GetCurrentContext();
const VisMatrix4x4_cl& mtxProjection = pCtx->GetProjectionMatrix();
VisContextCamera_cl* pContextCam = pCtx->GetCamera();
pContextCam->GetWorldMatrix( m_mtxViewProjection ); // it`s View mtx and not all cells are filled?!?, fix below
// ogl View to dx View mtx crap
float* pGlmatrix = m_mtxViewProjection.GetFloatPtr();
pGlmatrix[ 2 ] = -pGlmatrix[ 2 ];
pGlmatrix[ 6 ] = -pGlmatrix[ 6 ];
pGlmatrix[ 10 ] = -pGlmatrix[ 10 ];
pGlmatrix[ 14 ] = -pGlmatrix[ 14 ];
pGlmatrix[ 15 ] = 1.f; //this must be here, GetWorldMatrix DOES NOT fill all cells !!!
// multiply is now DX style (ogl is projection*view*world)
m_mtxViewProjection *= mtxProjection;
// get transpose mtx of ViewProjection
m_mtxViewProjectionT = m_mtxViewProjection;
m_mtxViewProjectionT.Transpose();
// gen VPInverse mtx (if sended to shader, must be transposed)
m_mtxViewProjectionInv = m_mtxViewProjection;
m_mtxViewProjectionInv.InvertEx();
// calculate -far & far plane vectors (homogeneous space)
m_NearPlane.v1.SetXYZW( -1, 1, 0, 1 );
m_NearPlane.v2.SetXYZW( 1, 1, 0, 1 );
m_NearPlane.v3.SetXYZW( 1, -1, 0, 1 );
m_NearPlane.v4.SetXYZW( -1, -1, 0, 1 );
m_FarPlane.v1.SetXYZW( -1, 1, 1, 1 );
m_FarPlane.v2.SetXYZW( 1, 1, 1, 1 );
m_FarPlane.v3.SetXYZW( 1, -1, 1, 1 );
m_FarPlane.v4.SetXYZW( -1, -1, 1, 1 );
// w are all ones so Vision may be used
m_NearPlane.v1 *= m_mtxViewProjectionInv;
m_NearPlane.v2 *= m_mtxViewProjectionInv;
m_NearPlane.v3 *= m_mtxViewProjectionInv;
m_NearPlane.v4 *= m_mtxViewProjectionInv;
m_FarPlane.v1 *= m_mtxViewProjectionInv;
m_FarPlane.v2 *= m_mtxViewProjectionInv;
m_FarPlane.v3 *= m_mtxViewProjectionInv;
m_FarPlane.v4 *= m_mtxViewProjectionInv;
_GetWorldPos( m_NearPlane, m_WorldNearPlane );
_GetWorldPos( m_FarPlane, m_WorldFarPlane );
GetIntersectionsAndPointsBeetween(); // will fill m_aIntesections & counter
// skip if can`t generate proper matrix ( volume is outside of frustum )
if( m_iInterectionsCount >= 4 ) // valid
{
// get clip space coords to calculate XY span
for( int i=0; i<m_iInterectionsCount; i++ )
{
//m_aIntersections[ i ].w = 1.f; // Vision use w as 1 so don`t set
m_aIntersections[ i ].z = 0.f; // TODO: should be water level
m_aIntersections[ i ] *= m_mtxViewProjectionT; // use transposed mtx
m_aIntersections[ i ].x /= m_aIntersections[ i ].w;
m_aIntersections[ i ].y /= m_aIntersections[ i ].w;
//m_aIntersections[ i ].z /= m_aIntersections[ i ].w; // we dont need Z
}
float fXMin = FLT_MAX; float fXMax = -FLT_MAX;
float fYMin = FLT_MAX; float fYMax = -FLT_MAX;
for( int i=0; i<m_iInterectionsCount; i++ )
{
if( m_aIntersections[ i ].x > fXMax )
fXMax = m_aIntersections[ i ].x;
if ( m_aIntersections[ i ].x < fXMin )
fXMin = m_aIntersections[ i ].x;
if( m_aIntersections[ i ].y > fYMax )
fYMax = m_aIntersections[ i ].y;
if ( m_aIntersections[ i ].y < fYMin )
fYMin = m_aIntersections[ i ].y;
}
// build scaling matrix. it prevents h-space verts in shader to run out of range
/* normal way
VisMatrix4x4_cl mtxScale;
mtxScale.Identity();
mtxScale[ 0 ] = fXMax - fXMin;
mtxScale[ 5 ] = fYMax - fYMin;
mtxScale[ 12 ] = fXMin;
mtxScale[ 13 ] = fYMin;
mtxScale.Transpose();
*/
// faster way
m_mtxScale[ 0 ] = fXMax - fXMin;
m_mtxScale[ 5 ] = fYMax - fYMin;
m_mtxScale[ 3 ] = fXMin;
m_mtxScale[ 7 ] = fYMin;
m_mtxViewProjectionInv *= m_mtxScale;
m_NearPlane.v1.SetXYZW( 0, 1, 0, 1 );
m_NearPlane.v2.SetXYZW( 1, 1, 0, 1 );
m_NearPlane.v3.SetXYZW( 1, 0, 0, 1 );
m_NearPlane.v4.SetXYZW( 0, 0, 0, 1 );
m_FarPlane.v1.SetXYZW( 0, 1, 1, 1 );
m_FarPlane.v2.SetXYZW( 1, 1, 1, 1 );
m_FarPlane.v3.SetXYZW( 1, 0, 1, 1 );
m_FarPlane.v4.SetXYZW( 0, 0, 1, 1 );
m_NearPlane.v1 *= m_mtxViewProjectionInv;
m_NearPlane.v2 *= m_mtxViewProjectionInv;
m_NearPlane.v3 *= m_mtxViewProjectionInv;
m_NearPlane.v4 *= m_mtxViewProjectionInv;
m_FarPlane.v1 *= m_mtxViewProjectionInv;
m_FarPlane.v2 *= m_mtxViewProjectionInv;
m_FarPlane.v3 *= m_mtxViewProjectionInv;
m_FarPlane.v4 *= m_mtxViewProjectionInv;
return true;
}else
{
// do not render
return false;
}
}
