//----------------------------------------------------------------//
void ZLFrustum::Init ( const ZLMatrix4x4& invViewProjMtx ) {
// set up the homogenous coordinates of the canonical view volume
ZLVec3D nlt ( -1.0f, 1.0f, -1.0f );
ZLVec3D nrt ( 1.0f, 1.0f, -1.0f );
ZLVec3D nrb ( 1.0f, -1.0f, -1.0f );
ZLVec3D nlb ( -1.0f, -1.0f, -1.0f );
ZLVec3D flt ( -1.0f, 1.0f, 1.0f );
ZLVec3D frt ( 1.0f, 1.0f, 1.0f );
ZLVec3D frb ( 1.0f, -1.0f, 1.0f );
ZLVec3D flb ( -1.0f, -1.0f, 1.0f );
// compute the corners of the frustum
invViewProjMtx.Project ( nlt );
invViewProjMtx.Project ( nrt );
invViewProjMtx.Project ( nrb );
invViewProjMtx.Project ( nlb );
invViewProjMtx.Project ( flt );
invViewProjMtx.Project ( frt );
invViewProjMtx.Project ( frb );
invViewProjMtx.Project ( flb );
this->mPoints [ NEAR_LT_POINT ].Init ( nlt.mX, nlt.mY, nlt.mZ );
this->mPoints [ NEAR_RT_POINT ].Init ( nrt.mX, nrt.mY, nrt.mZ );
this->mPoints [ NEAR_RB_POINT ].Init ( nrb.mX, nrb.mY, nrb.mZ );
this->mPoints [ NEAR_LB_POINT ].Init ( nlb.mX, nlb.mY, nlb.mZ );
this->mPoints [ FAR_LT_POINT ].Init ( flt.mX, flt.mY, flt.mZ );
this->mPoints [ FAR_RT_POINT ].Init ( frt.mX, frt.mY, frt.mZ );
this->mPoints [ FAR_RB_POINT ].Init ( frb.mX, frb.mY, frb.mZ );
this->mPoints [ FAR_LB_POINT ].Init ( flb.mX, flb.mY, flb.mZ );
// Compute the frustum's axis-aligned bounding box
this->mAABB.Init ( nlt );
this->mAABB.Grow ( nrt );
this->mAABB.Grow ( nrb );
this->mAABB.Grow ( nlb );
this->mAABB.Grow ( flt );
this->mAABB.Grow ( frt );
this->mAABB.Grow ( frb );
this->mAABB.Grow ( flb );
// intialize the planes
this->mPlanes [ LEFT_PLANE ].Init ( nlt, flt, flb );
this->mPlanes [ RIGHT_PLANE ].Init ( nrb, frb, frt );
this->mPlanes [ TOP_PLANE ].Init ( nrt, frt, flt );
this->mPlanes [ BOTTOM_PLANE ].Init ( nlb, flb, frb );
this->mPlanes [ NEAR_PLANE ].Init ( nrt, nlt, nlb );
this->mPlanes [ FAR_PLANE ].Init ( flt, frt, frb );
double frustArea = _frustArea ( *this );
double boxArea = this->mAABB.Area ();
this->mUsePlanesForCull = (( float )( frustArea / boxArea )) < MIN_FILL_RATIO;
}
//----------------------------------------------------------------//
void ZLPrism::Transform ( const ZLMatrix4x4& mtx ) {
mtx.Transform ( mLoc );
mtx.TransformVec ( mXAxis );
mtx.TransformVec ( mYAxis );
mtx.TransformVec ( mZAxis );
}
//----------------------------------------------------------------//
ZLRect MOAILayoutFrame::GetScissorRect () {
ZLRect scissorRect = this->GetFrame ();
ZLMatrix4x4 mtx;
// TODO:
mtx.Init ( this->mLocalToWorldMtx );
//mtx.Append ( MOAIGfxDevice::Get ().GetWorldToWndMtx ( 1.0f, 1.0f ));
mtx.Transform ( scissorRect );
return scissorRect;
}
//----------------------------------------------------------------//
ZLRect MOAIScissorRect::GetScissorRect ( const ZLMatrix4x4& worldToWndMtx ) const {
ZLVec3D vtx3D [ 4 ];
vtx3D [ 0 ].mX = this->mRect.mXMin;
vtx3D [ 0 ].mY = this->mRect.mYMin;
vtx3D [ 0 ].mZ = 0.0f;
vtx3D [ 1 ].mX = this->mRect.mXMin;
vtx3D [ 1 ].mY = this->mRect.mYMax;
vtx3D [ 1 ].mZ = 0.0f;
vtx3D [ 2 ].mX = this->mRect.mXMax;
vtx3D [ 2 ].mY = this->mRect.mYMax;
vtx3D [ 2 ].mZ = 0.0f;
vtx3D [ 3 ].mX = this->mRect.mXMax;
vtx3D [ 3 ].mY = this->mRect.mYMin;
vtx3D [ 3 ].mZ = 0.0f;
ZLMatrix4x4 mtx;
mtx.Init ( this->GetLocalToWorldMtx ());
mtx.Append ( worldToWndMtx );
mtx.Project ( vtx3D [ 0 ]);
mtx.Project ( vtx3D [ 1 ]);
mtx.Project ( vtx3D [ 2 ]);
mtx.Project ( vtx3D [ 3 ]);
ZLRect scissorRect;
scissorRect.Init ( vtx3D [ 0 ]);
scissorRect.Grow ( vtx3D [ 1 ]);
scissorRect.Grow ( vtx3D [ 2 ]);
scissorRect.Grow ( vtx3D [ 3 ]);
if ( this->mScissorRect ) {
ZLRect parentRect = this->mScissorRect->GetScissorRect ( worldToWndMtx );
parentRect.Clip ( scissorRect );
}
return scissorRect;
}
//----------------------------------------------------------------//
void MOAIDraw::DrawRay ( float x, float y, float dx, float dy ) {
USVec2D loc ( x, y );
USVec2D vec ( dx, dy );
ZLMatrix4x4 mtx = MOAIGfxDevice::Get ().GetViewProjMtx ();
ZLMatrix4x4 invMtx;
invMtx.Inverse ( mtx );
mtx.Transform ( loc );
mtx.TransformVec ( vec );
ZLRect viewRect;
viewRect.Init ( -1.0f, -1.0f, 1.0f, 1.0f );
USVec2D p0;
USVec2D p1;
if ( viewRect.GetIntersection ( loc, vec, p0, p1 )) {
invMtx.Transform ( p0 );
invMtx.Transform ( p1 );
MOAIGfxDevice& gfxDevice = MOAIGfxDevice::Get ();
gfxDevice.BeginPrim ( ZGL_PRIM_LINES );
gfxDevice.WriteVtx ( p0.mX, p0.mY, 0.0f );
gfxDevice.WriteFinalColor4b ();
gfxDevice.WriteVtx ( p1.mX, p1.mY, 0.0f );
gfxDevice.WriteFinalColor4b ();
gfxDevice.EndPrim ();
}
}
//----------------------------------------------------------------//
void ZLQuaternion::Get ( ZLMatrix4x4& m ) const {
ZLAffine3D affine;
this->Get ( affine );
m.Init ( affine );
}
//----------------------------------------------------------------//
void MOAIDraw::DrawAxisGrid ( USVec2D loc, USVec2D vec, float size ) {
ZLMatrix4x4 mtx = MOAIGfxDevice::Get ().GetViewProjMtx ();
ZLMatrix4x4 invMtx;
invMtx.Inverse ( mtx );
// Set the axis to the grid length so we can get the length back post-transform
vec.SetLength ( size );
mtx.Transform ( loc );
mtx.TransformVec ( vec );
// Get the axis unit vector
USVec2D norm = vec;
size = norm.NormSafe ();
// Get the axis normal
USVec2D perpNorm ( norm.mY, -norm.mX );
// Project the corners of the viewport onto the axis to get the mix/max bounds
float dot;
float min;
float max;
USVec2D corner;
// left, top
corner.Init ( -1.0f, 1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = dot;
max = dot;
// right, top
corner.Init ( 1.0f, 1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = ( dot < min ) ? dot : min;
max = ( dot > max ) ? dot : max;
// right, bottom
corner.Init ( 1.0f, -1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = ( dot < min ) ? dot : min;
max = ( dot > max ) ? dot : max;
// left, bottom
corner.Init ( -1.0f, -1.0f );
corner.Sub ( loc );
dot = norm.Dot ( corner );
min = ( dot < min ) ? dot : min;
max = ( dot > max ) ? dot : max;
// Get the start andstop grids
s32 start = ( s32 )( min / size ) - 1;
s32 stop = ( s32 )( max / size ) + 1;
// Set the pen to the first...
USVec2D pen = norm;
pen.Scale (( float )start * size );
pen.Add ( loc );
// Step along the axis to draw perpendicular grid lines
ZLRect viewRect;
viewRect.Init ( -1.0f, -1.0f, 1.0f, 1.0f );
for ( ; start < stop; ++start ) {
USVec2D p0;
USVec2D p1;
if ( viewRect.GetIntersection ( pen, perpNorm, p0, p1 )) {
invMtx.Transform ( p0 );
invMtx.Transform ( p1 );
MOAIDraw::DrawLine ( p0, p1 );
}
pen.Add ( vec );
}
}
