mirror of
https://github.com/ptitSeb/Serious-Engine
synced 2024-11-22 18:30:27 +01:00
532 lines
18 KiB
C++
532 lines
18 KiB
C++
/* Copyright (c) 2002-2012 Croteam Ltd.
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of version 2 of the GNU General Public License as published by
|
|
the Free Software Foundation
|
|
|
|
|
|
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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU 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. */
|
|
|
|
/////////////////////////////////////////////////////////////////////
|
|
// Clipping functions
|
|
|
|
// check if a polygon is to be visible
|
|
__forceinline ULONG CRenderer::GetPolygonVisibility(const CBrushPolygon &bpo)
|
|
{
|
|
// get transformed polygon's plane
|
|
CWorkingPlane *pwplPolygonPlane = bpo.bpo_pbplPlane->bpl_pwplWorking;
|
|
CWorkingPlane wplReverse;
|
|
BOOL bInvertPolygon = FALSE;
|
|
|
|
// if the polygon should be inverted or double sided
|
|
if((re_bRenderingShadows
|
|
&&!re_bDirectionalShadows
|
|
&&re_ubLightIllumination!=0
|
|
&&bpo.bpo_bppProperties.bpp_ubIlluminationType==re_ubLightIllumination)
|
|
|| (re_pbrCurrent->br_pfsFieldSettings!=NULL && !pwplPolygonPlane->wpl_bVisible)
|
|
) {
|
|
bInvertPolygon = TRUE;
|
|
}
|
|
|
|
if (bInvertPolygon) {
|
|
// make temporary inverted polygon plane
|
|
pwplPolygonPlane = &wplReverse;
|
|
pwplPolygonPlane->wpl_plView = -bpo.bpo_pbplPlane->bpl_pwplWorking->wpl_plView;
|
|
pwplPolygonPlane->wpl_bVisible =
|
|
re_pbrCurrent->br_prProjection->IsViewerPlaneVisible(pwplPolygonPlane->wpl_plView);
|
|
}
|
|
|
|
// if the poly is double-sided and detail
|
|
if( !re_bRenderingShadows && (bpo.bpo_ulFlags&BPOF_DOUBLESIDED) && (bpo.bpo_ulFlags&BPOF_DETAILPOLYGON)) {
|
|
// it's definately visible
|
|
return PDF_POLYGONVISIBLE;
|
|
}
|
|
|
|
// if the plane is invisible
|
|
if (!pwplPolygonPlane->wpl_bVisible) {
|
|
// polygon is invisible
|
|
return 0;
|
|
}
|
|
|
|
// if the polygon is invisible
|
|
if ((bpo.bpo_ulFlags&BPOF_INVISIBLE)
|
|
||(re_bRenderingShadows && (bpo.bpo_ulFlags&BPOF_DOESNOTCASTSHADOW))) {
|
|
// skip it
|
|
return 0;
|
|
}
|
|
|
|
ULONG ulDirection = PDF_POLYGONVISIBLE;
|
|
BOOL bProjectionInverted = re_prProjection->pr_bInverted;
|
|
if (bProjectionInverted && !bInvertPolygon) {
|
|
ulDirection |= PDF_FLIPEDGESPRE;
|
|
} else if (!bProjectionInverted && bInvertPolygon){
|
|
ulDirection |= PDF_FLIPEDGESPOST;
|
|
}
|
|
|
|
// else, polygon is visible
|
|
return ulDirection;
|
|
}
|
|
|
|
|
|
// check if polygon is outside viewfrustum
|
|
__forceinline BOOL CRenderer::IsPolygonCulled(const CBrushPolygon &bpo)
|
|
{
|
|
CBrushSector &bsc = *bpo.bpo_pbscSector;
|
|
// setup initial mask
|
|
ULONG ulMask = 0xFFFFFFFF;
|
|
|
|
// for each vertex
|
|
INDEX ctVtx = bpo.bpo_apbvxTriangleVertices.Count();
|
|
{for(INDEX i=0; i<ctVtx; i++) {
|
|
CBrushVertex *pbvx = bpo.bpo_apbvxTriangleVertices[i];
|
|
INDEX ivx = bsc.bsc_abvxVertices.Index(pbvx);
|
|
// get the outcodes for that vertex
|
|
ULONG ulCode = re_avvxViewVertices[bsc.bsc_ivvx0+ivx].vvx_ulOutcode;
|
|
// and them to the mask
|
|
ulMask &= ulCode;
|
|
}}
|
|
|
|
// if any bit in the mask is still set, it means that all points are out
|
|
// wtr to that plane
|
|
return ulMask;
|
|
}
|
|
|
|
// find which portals should be rendered as portals or as pretenders
|
|
void CRenderer::FindPretenders(void)
|
|
{
|
|
re_pbscCurrent->bsc_ispo0 = re_aspoScreenPolygons.Count();
|
|
// for all polygons in sector
|
|
FOREACHINSTATICARRAY(re_pbscCurrent->bsc_abpoPolygons, CBrushPolygon, itpo) {
|
|
CBrushPolygon &bpo = *itpo;
|
|
// initially not rendered as portal
|
|
bpo.bpo_ulFlags&=~BPOF_RENDERASPORTAL;
|
|
// if it is portal,
|
|
if (bpo.bpo_ulFlags&BPOF_PORTAL) {
|
|
// initially rendered as portal
|
|
bpo.bpo_ulFlags|=BPOF_RENDERASPORTAL;
|
|
|
|
// if could be a pretender
|
|
if (bpo.bpo_bppProperties.bpp_uwPretenderDistance!=0) {
|
|
// get distance at which it is a pretender
|
|
FLOAT fPretenderDistance = bpo.bpo_bppProperties.bpp_uwPretenderDistance;
|
|
|
|
// for each vertex in the polygon
|
|
INDEX ctVtx = bpo.bpo_apbvxTriangleVertices.Count();
|
|
CBrushSector &bsc = *bpo.bpo_pbscSector;
|
|
{for(INDEX i=0; i<ctVtx; i++) {
|
|
CBrushVertex *pbvx = bpo.bpo_apbvxTriangleVertices[i];
|
|
INDEX ivx = bsc.bsc_abvxVertices.Index(pbvx);
|
|
// get distance of the vertex from the view plane
|
|
FLOAT fx = re_avvxViewVertices[bsc.bsc_ivvx0+ivx].vvx_vView(1);
|
|
FLOAT fy = re_avvxViewVertices[bsc.bsc_ivvx0+ivx].vvx_vView(2);
|
|
FLOAT fz = re_avvxViewVertices[bsc.bsc_ivvx0+ivx].vvx_vView(3);
|
|
FLOAT fD = fx*fx+fy*fy+fz*fz;
|
|
// if nearer than allowed pretender distance
|
|
if (fD<fPretenderDistance*fPretenderDistance) {
|
|
// this polygon is not a pretender
|
|
goto nextpolygon;
|
|
}
|
|
}}
|
|
// if all vertices passed the check, mark as pretender
|
|
bpo.bpo_ulFlags&=~BPOF_RENDERASPORTAL;
|
|
}
|
|
}
|
|
nextpolygon:;
|
|
}
|
|
}
|
|
|
|
// make screen polygons for nondetail polygons in current sector
|
|
void CRenderer::MakeNonDetailScreenPolygons(void)
|
|
{
|
|
_pfRenderProfile.StartTimer(CRenderProfile::PTI_MAKENONDETAILSCREENPOLYGONS);
|
|
|
|
re_pbscCurrent->bsc_ispo0 = re_aspoScreenPolygons.Count();
|
|
// detail polygons are not skipped if rendering shadows
|
|
const ULONG ulDetailMask = re_bRenderingShadows ? 0 : BPOF_DETAILPOLYGON;
|
|
|
|
// for all polygons in sector
|
|
FOREACHINSTATICARRAY(re_pbscCurrent->bsc_abpoPolygons, CBrushPolygon, itpo) {
|
|
CBrushPolygon &bpo = *itpo;
|
|
|
|
// if polygon does not contribute to the visibility determination
|
|
if ( (bpo.bpo_ulFlags&ulDetailMask)
|
|
&&!(bpo.bpo_ulFlags&BPOF_RENDERASPORTAL)) {
|
|
// skip it
|
|
continue;
|
|
}
|
|
|
|
// no screen polygon by default
|
|
bpo.bpo_pspoScreenPolygon = NULL;
|
|
|
|
// skip if the polygon is not visible
|
|
ASSERT( !IsPolygonCulled(bpo)); // cannot be culled yet!
|
|
const ULONG ulVisible = GetPolygonVisibility(bpo);
|
|
if( ulVisible==0) continue;
|
|
|
|
_sfStats.IncrementCounter(CStatForm::SCI_POLYGONS);
|
|
_pfRenderProfile.IncrementCounter(CRenderProfile::PCI_NONDETAILPOLYGONS);
|
|
|
|
// make screen polygon for the polygon
|
|
CScreenPolygon &spo = *MakeScreenPolygon(bpo);
|
|
|
|
// add its edges
|
|
MakeInitialPolygonEdges(bpo, spo, ulVisible);
|
|
}
|
|
|
|
// remember number of polygons in sector
|
|
re_pbscCurrent->bsc_ctspo = re_aspoScreenPolygons.Count()-re_pbscCurrent->bsc_ispo0;
|
|
|
|
_pfRenderProfile.StopTimer(CRenderProfile::PTI_MAKENONDETAILSCREENPOLYGONS);
|
|
}
|
|
|
|
|
|
// make screen polygons for detail polygons in current sector
|
|
void CRenderer::MakeDetailScreenPolygons(void)
|
|
{
|
|
// if rendering shadows or not rendering detail polygons
|
|
if (re_bRenderingShadows
|
|
||!wld_bRenderDetailPolygons) {
|
|
// do nothing
|
|
return;
|
|
}
|
|
|
|
_pfRenderProfile.StartTimer(CRenderProfile::PTI_MAKEDETAILSCREENPOLYGONS);
|
|
// for all polygons in sector
|
|
FOREACHINSTATICARRAY(re_pbscCurrent->bsc_abpoPolygons, CBrushPolygon, itpo) {
|
|
CBrushPolygon &bpo = *itpo;
|
|
|
|
// if polygon is not detail
|
|
if (!(bpo.bpo_ulFlags&BPOF_DETAILPOLYGON)
|
|
|| (bpo.bpo_ulFlags&BPOF_RENDERASPORTAL)) {
|
|
// skip it
|
|
continue;
|
|
}
|
|
|
|
// no screen polygon by default
|
|
bpo.bpo_pspoScreenPolygon = NULL;
|
|
|
|
// skip if the polygon is not visible
|
|
if( GetPolygonVisibility(bpo)==0) continue;
|
|
// skip if outside the frustum
|
|
if( (re_pbscCurrent->bsc_ulFlags&BSCF_NEEDSCLIPPING) && IsPolygonCulled(bpo)) continue;
|
|
|
|
_sfStats.IncrementCounter(CStatForm::SCI_DETAILPOLYGONS);
|
|
_pfRenderProfile.IncrementCounter(CRenderProfile::PCI_DETAILPOLYGONS);
|
|
|
|
// make screen polygon for the polygon
|
|
CScreenPolygon &spo = *MakeScreenPolygon(bpo);
|
|
|
|
// if it is portal
|
|
if (spo.IsPortal()) {
|
|
// pass it immediately
|
|
PassPortal(spo);
|
|
} else {
|
|
// add polygon to scene polygons for rendering
|
|
AddPolygonToScene(&spo);
|
|
}
|
|
}
|
|
_pfRenderProfile.StopTimer(CRenderProfile::PTI_MAKEDETAILSCREENPOLYGONS);
|
|
}
|
|
|
|
// make initial edges for a polygon
|
|
void CRenderer::MakeInitialPolygonEdges(CBrushPolygon &bpo, CScreenPolygon &spo, BOOL ulDirection)
|
|
{
|
|
// get number of edges
|
|
INDEX ctEdges = bpo.bpo_abpePolygonEdges.Count();
|
|
spo.spo_ubDirectionFlags = ulDirection&PDF_FLIPEDGESPOST;
|
|
BOOL bInvert = (ulDirection&PDF_FLIPEDGESPRE)!=0;
|
|
|
|
// remember edge vertex start and count
|
|
spo.spo_ctEdgeVx = ctEdges*2;
|
|
spo.spo_iEdgeVx0 = re_aiEdgeVxClipSrc.Count();
|
|
|
|
// create edge vertices
|
|
INDEX *ai = re_aiEdgeVxClipSrc.Push(ctEdges*2);
|
|
|
|
// for each edge
|
|
for (INDEX iEdge=0; iEdge<ctEdges; iEdge++) {
|
|
// set the two vertices
|
|
CBrushPolygonEdge &bpe = bpo.bpo_abpePolygonEdges[iEdge];
|
|
CWorkingEdge &wed = *bpe.bpe_pbedEdge->bed_pwedWorking;
|
|
if (bpe.bpe_bReverse^bInvert) {
|
|
ai[iEdge*2+0] = wed.wed_iwvx1+re_iViewVx0;
|
|
ai[iEdge*2+1] = wed.wed_iwvx0+re_iViewVx0;
|
|
} else {
|
|
ai[iEdge*2+0] = wed.wed_iwvx0+re_iViewVx0;
|
|
ai[iEdge*2+1] = wed.wed_iwvx1+re_iViewVx0;
|
|
}
|
|
}
|
|
}
|
|
|
|
// make final edges for all polygons in current sector
|
|
void CRenderer::MakeFinalPolygonEdges(void)
|
|
{
|
|
_pfRenderProfile.StartTimer(CRenderProfile::PTI_MAKEFINALPOLYGONEDGES);
|
|
// for each polygon
|
|
INDEX ispo0 = re_pbscCurrent->bsc_ispo0;
|
|
INDEX ispoTop = re_pbscCurrent->bsc_ispo0+re_pbscCurrent->bsc_ctspo;
|
|
for(INDEX ispo = ispo0; ispo<ispoTop; ispo++) {
|
|
CScreenPolygon &spo = re_aspoScreenPolygons[ispo];
|
|
|
|
// if polygon has no edges
|
|
if (spo.spo_ctEdgeVx==0) {
|
|
// skip it
|
|
continue;
|
|
}
|
|
|
|
INDEX iEdgeVx0New = re_aiEdgeVxMain.Count();
|
|
INDEX *piVertices = re_aiEdgeVxMain.Push(spo.spo_ctEdgeVx);
|
|
|
|
// for each vertex
|
|
INDEX ivxTop = spo.spo_iEdgeVx0+spo.spo_ctEdgeVx;
|
|
for(INDEX ivx=spo.spo_iEdgeVx0; ivx<ivxTop; ivx++) {
|
|
// copy to final array
|
|
*piVertices++ = re_aiEdgeVxClipSrc[ivx];
|
|
}
|
|
|
|
// remember new edge vertex positions
|
|
spo.spo_iEdgeVx0 = iEdgeVx0New;
|
|
}
|
|
|
|
// clear temporary arrays
|
|
re_aiEdgeVxClipSrc.PopAll();
|
|
re_aiEdgeVxClipDst.PopAll();
|
|
_pfRenderProfile.StopTimer(CRenderProfile::PTI_MAKEFINALPOLYGONEDGES);
|
|
}
|
|
|
|
// clip all polygons to one clip plane
|
|
void CRenderer::ClipToOnePlane(const FLOATplane3D &plView)
|
|
{
|
|
// remember clip plane
|
|
re_plClip = plView;
|
|
// no need for clipping if no vertices are outside
|
|
ASSERT( re_pbscCurrent->bsc_ulFlags&BSCF_NEEDSCLIPPING);
|
|
if( !MakeOutcodes()) return;
|
|
|
|
// for each polygon
|
|
INDEX ispo0 = re_pbscCurrent->bsc_ispo0;
|
|
INDEX ispoTop = re_pbscCurrent->bsc_ispo0+re_pbscCurrent->bsc_ctspo;
|
|
for(INDEX ispo = ispo0; ispo<ispoTop; ispo++) {
|
|
// clip to the plane
|
|
ClipOnePolygon(re_aspoScreenPolygons[ispo]);
|
|
}
|
|
|
|
// swap edge buffers
|
|
Swap(re_aiEdgeVxClipSrc.sa_Count , re_aiEdgeVxClipDst.sa_Count );
|
|
Swap(re_aiEdgeVxClipSrc.sa_Array , re_aiEdgeVxClipDst.sa_Array );
|
|
Swap(re_aiEdgeVxClipSrc.sa_UsedCount, re_aiEdgeVxClipDst.sa_UsedCount);
|
|
re_aiEdgeVxClipDst.PopAll();
|
|
}
|
|
|
|
// clip all polygons to all clip planes of a projection
|
|
void CRenderer::ClipToAllPlanes(CAnyProjection3D &pr)
|
|
{
|
|
_pfRenderProfile.StartTimer(CRenderProfile::PTI_CLIPTOALLPLANES);
|
|
// clip to up/down/left/right clip planes
|
|
FLOATplane3D pl;
|
|
pl = pr->pr_plClipU; pl.Offset(-0.001f); ClipToOnePlane(pl);
|
|
pl = pr->pr_plClipD; pl.Offset(-0.001f); ClipToOnePlane(pl);
|
|
pl = pr->pr_plClipL; pl.Offset(-0.001f); ClipToOnePlane(pl);
|
|
pl = pr->pr_plClipR; pl.Offset(-0.001f); ClipToOnePlane(pl);
|
|
// clip to near clip plane
|
|
ClipToOnePlane(FLOATplane3D(FLOAT3D(0,0,-1), pr->pr_NearClipDistance));
|
|
// clip to far clip plane if existing
|
|
if (pr->pr_FarClipDistance>0) {
|
|
ClipToOnePlane(FLOATplane3D(FLOAT3D(0,0,1), -pr->pr_FarClipDistance));
|
|
}
|
|
|
|
// if projection is mirrored or warped
|
|
if (pr->pr_bMirror||pr->pr_bWarp) {
|
|
// clip to mirror plane
|
|
ClipToOnePlane(pr->pr_plMirrorView);
|
|
}
|
|
_pfRenderProfile.StopTimer(CRenderProfile::PTI_CLIPTOALLPLANES);
|
|
}
|
|
|
|
// make outcodes for current clip plane for all active vertices
|
|
__forceinline BOOL CRenderer::MakeOutcodes(void)
|
|
{
|
|
SLONG slMask = 0;
|
|
// for each active view vertex
|
|
INDEX iVxTop = re_avvxViewVertices.Count();
|
|
for(INDEX ivx = re_iViewVx0; ivx<iVxTop; ivx++) {
|
|
CViewVertex &vvx = re_avvxViewVertices[ivx];
|
|
// calculate the distance
|
|
vvx.vvx_fD = re_plClip.PointDistance(vvx.vvx_vView);
|
|
// calculate the outcode
|
|
const ULONG ulOutCode = (*(SLONG*)&vvx.vvx_fD) & 0x80000000;
|
|
// add to the outcode of the vertex
|
|
vvx.vvx_ulOutcode = (vvx.vvx_ulOutcode>>1)|ulOutCode;
|
|
// add to mask
|
|
slMask|=ulOutCode;
|
|
}
|
|
// if any was negative, return true -- needs clipping
|
|
return slMask;
|
|
}
|
|
|
|
// clip one polygon to current clip plane
|
|
void CRenderer::ClipOnePolygon(CScreenPolygon &spo)
|
|
{
|
|
//
|
|
// NOTE: There is one ugly problem with this loop.
|
|
// I don't know any better way to fix it, so I have commented it.
|
|
// If the vertex references (vvx0 and vvx1) are taken _before_ pushing the vvxNew,
|
|
// it can cause access violation, because pushing can move array in memory.
|
|
// Therefore, it is important to take the references _after_ the Push() call.
|
|
|
|
INDEX iEdgeVx0New = re_aiEdgeVxClipDst.Count();
|
|
|
|
// for each edge
|
|
INDEX ivxTop = spo.spo_iEdgeVx0+spo.spo_ctEdgeVx;
|
|
for(INDEX ivx=spo.spo_iEdgeVx0; ivx<ivxTop; ivx+=2) {
|
|
INDEX ivx0 = re_aiEdgeVxClipSrc[ivx+0];
|
|
INDEX ivx1 = re_aiEdgeVxClipSrc[ivx+1];
|
|
|
|
// get vertices
|
|
FLOAT fD0 = re_avvxViewVertices[ivx0].vvx_fD;
|
|
FLOAT fD1 = re_avvxViewVertices[ivx1].vvx_fD;
|
|
if (fD0<=0) {
|
|
// if both are back
|
|
if (fD1<=0) {
|
|
// no screen edge remains
|
|
continue;
|
|
// if first is back, second front
|
|
} else {
|
|
// make new vertex
|
|
INDEX ivxNew = re_avvxViewVertices.Count();
|
|
CViewVertex &vvxNew = re_avvxViewVertices.Push();
|
|
CViewVertex &vvx0 = re_avvxViewVertices[ivx0]; // must do this after push, see note above!
|
|
CViewVertex &vvx1 = re_avvxViewVertices[ivx1]; // must do this after push, see note above!
|
|
// clip first
|
|
FLOAT fDivisor = 1.0f/(fD0-fD1);
|
|
FLOAT fFactor = fD0*fDivisor;
|
|
vvxNew.vvx_vView(1) = vvx0.vvx_vView(1)-(vvx0.vvx_vView(1)-vvx1.vvx_vView(1))*fFactor;
|
|
vvxNew.vvx_vView(2) = vvx0.vvx_vView(2)-(vvx0.vvx_vView(2)-vvx1.vvx_vView(2))*fFactor;
|
|
vvxNew.vvx_vView(3) = vvx0.vvx_vView(3)-(vvx0.vvx_vView(3)-vvx1.vvx_vView(3))*fFactor;
|
|
// remember new edge
|
|
re_aiEdgeVxClipDst.Push() = ivxNew;
|
|
re_aiEdgeVxClipDst.Push() = ivx1;
|
|
// add new vertex to clip buffer
|
|
re_aiClipBuffer.Push() = ivxNew;
|
|
}
|
|
} else {
|
|
// if first is front, second back
|
|
if ((SLONG&)fD1<=0) {
|
|
// make new vertex
|
|
INDEX ivxNew = re_avvxViewVertices.Count();
|
|
CViewVertex &vvxNew = re_avvxViewVertices.Push();
|
|
CViewVertex &vvx0 = re_avvxViewVertices[ivx0]; // must do this after push, see note above!
|
|
CViewVertex &vvx1 = re_avvxViewVertices[ivx1]; // must do this after push, see note above!
|
|
// clip second
|
|
FLOAT fDivisor = 1.0f/(fD0-fD1);
|
|
FLOAT fFactor = fD1*fDivisor;
|
|
vvxNew.vvx_vView(1) = vvx1.vvx_vView(1)-(vvx0.vvx_vView(1)-vvx1.vvx_vView(1))*fFactor;
|
|
vvxNew.vvx_vView(2) = vvx1.vvx_vView(2)-(vvx0.vvx_vView(2)-vvx1.vvx_vView(2))*fFactor;
|
|
vvxNew.vvx_vView(3) = vvx1.vvx_vView(3)-(vvx0.vvx_vView(3)-vvx1.vvx_vView(3))*fFactor;
|
|
// remember new edge
|
|
re_aiEdgeVxClipDst.Push() = ivx0;
|
|
re_aiEdgeVxClipDst.Push() = ivxNew;
|
|
// add new vertex to clip buffer
|
|
re_aiClipBuffer.Push() = ivxNew;
|
|
// if both are front
|
|
} else {
|
|
// just copy the edge
|
|
re_aiEdgeVxClipDst.Push() = ivx0;
|
|
re_aiEdgeVxClipDst.Push() = ivx1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// if there is anything in clip buffer
|
|
if (re_aiClipBuffer.Count()>0) {
|
|
// generate clip edges
|
|
GenerateClipEdges(spo);
|
|
}
|
|
|
|
// remember new edge vertex positions
|
|
spo.spo_ctEdgeVx = re_aiEdgeVxClipDst.Count()-iEdgeVx0New;
|
|
spo.spo_iEdgeVx0 = iEdgeVx0New;
|
|
}
|
|
|
|
/*
|
|
* Compare two vertices for quick-sort.
|
|
*/
|
|
static UBYTE *_aVertices=NULL;
|
|
static int qsort_CompareVertices_plus( const void *ppvVertex0, const void *ppvVertex1)
|
|
{
|
|
INDEX ivx0 = *(const INDEX*)ppvVertex0;
|
|
INDEX ivx1 = *(const INDEX*)ppvVertex1;
|
|
FLOAT f0 = *(FLOAT*)(_aVertices+ivx0*sizeof(CViewVertex));
|
|
FLOAT f1 = *(FLOAT*)(_aVertices+ivx1*sizeof(CViewVertex));
|
|
if (f0<f1) return -1;
|
|
else if (f0>f1) return +1;
|
|
else return 0;
|
|
}
|
|
static int qsort_CompareVertices_minus( const void *ppvVertex0, const void *ppvVertex1)
|
|
{
|
|
INDEX ivx0 = *(const INDEX*)ppvVertex0;
|
|
INDEX ivx1 = *(const INDEX*)ppvVertex1;
|
|
FLOAT f0 = *(FLOAT*)(_aVertices+ivx0*sizeof(CViewVertex));
|
|
FLOAT f1 = *(FLOAT*)(_aVertices+ivx1*sizeof(CViewVertex));
|
|
if (f0<f1) return +1;
|
|
else if (f0>f1) return -1;
|
|
else return 0;
|
|
}
|
|
|
|
// generate clip edges for one polygon
|
|
void CRenderer::GenerateClipEdges(CScreenPolygon &spo)
|
|
{
|
|
ASSERT(re_aiClipBuffer.Count()>0);
|
|
|
|
FLOATplane3D &plPolygonPlane = spo.spo_pbpoBrushPolygon->bpo_pbplPlane->bpl_pwplWorking->wpl_plView;
|
|
// calculate the clip buffer direction in 3d as:
|
|
// clip_normal_vector x polygon_normal_vector
|
|
FLOAT3D vClipDir = ((FLOAT3D &)re_plClip)*((FLOAT3D &)plPolygonPlane);
|
|
|
|
// get max axis
|
|
INDEX iMaxAxis = 1;
|
|
FLOAT fMaxAbs = Abs(vClipDir(1));
|
|
if (Abs(vClipDir(2))>fMaxAbs) {
|
|
iMaxAxis = 2;
|
|
fMaxAbs = Abs(vClipDir(2));
|
|
}
|
|
if (Abs(vClipDir(3))>fMaxAbs) {
|
|
iMaxAxis = 3;
|
|
fMaxAbs = Abs(vClipDir(3));
|
|
}
|
|
|
|
_aVertices = (UBYTE*) &re_avvxViewVertices[0].vvx_vView(iMaxAxis);
|
|
|
|
INDEX *aIndices = &re_aiClipBuffer[0];
|
|
INDEX ctIndices = re_aiClipBuffer.Count();
|
|
|
|
// there must be even number of vertices in the buffer
|
|
ASSERT(ctIndices%2 == 0);
|
|
|
|
// if the sign of axis is negative
|
|
if (vClipDir(iMaxAxis)<0) {
|
|
// sort them inversely
|
|
qsort(aIndices, ctIndices, sizeof(INDEX), qsort_CompareVertices_minus);
|
|
// if it is negative
|
|
} else {
|
|
// sort them normally
|
|
qsort(aIndices, ctIndices, sizeof(INDEX), qsort_CompareVertices_plus);
|
|
}
|
|
|
|
// for each two vertices
|
|
for(INDEX iClippedVertex=0; iClippedVertex<ctIndices; iClippedVertex+=2) {
|
|
// add the edge
|
|
re_aiEdgeVxClipDst.Push() = aIndices[iClippedVertex+0];
|
|
re_aiEdgeVxClipDst.Push() = aIndices[iClippedVertex+1];
|
|
}
|
|
|
|
// clear the clip buffer
|
|
re_aiClipBuffer.PopAll();
|
|
}
|