mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-02 08:51:57 +00:00
1055 lines
30 KiB
C++
1055 lines
30 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#pragma hdrstop
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#include "../idlib/precompiled.h"
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#include "tr_local.h"
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// if we hit this many planes, we will just stop cropping the
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// view down, which is still correct, just conservative
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const int MAX_PORTAL_PLANES = 20;
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struct portalStack_t {
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const portal_t * p;
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const portalStack_t * next;
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// positive side is outside the visible frustum
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int numPortalPlanes;
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idPlane portalPlanes[MAX_PORTAL_PLANES+1];
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idScreenRect rect;
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};
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/*
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=======================================================================
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Create viewLights and viewEntitys for the lights and entities that are
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visible in the portal areas that can be seen from the current viewpoint.
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=======================================================================
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*/
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/*
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=============
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R_SetLightDefViewLight
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If the lightDef is not already on the viewLight list, create
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a viewLight and add it to the list with an empty scissor rect.
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=============
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*/
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viewLight_t *R_SetLightDefViewLight( idRenderLightLocal *light ) {
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if ( light->viewCount == tr.viewCount ) {
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// already set up for this frame
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return light->viewLight;
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}
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light->viewCount = tr.viewCount;
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// add to the view light chain
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viewLight_t * vLight = (viewLight_t *)R_ClearedFrameAlloc( sizeof( *vLight ), FRAME_ALLOC_VIEW_LIGHT );
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vLight->lightDef = light;
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// the scissorRect will be expanded as the light bounds is accepted into visible portal chains
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// and the scissor will be reduced in R_AddSingleLight based on the screen space projection
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vLight->scissorRect.Clear();
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// link the view light
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vLight->next = tr.viewDef->viewLights;
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tr.viewDef->viewLights = vLight;
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light->viewLight = vLight;
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return vLight;
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}
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/*
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=============
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R_SetEntityDefViewEntity
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If the entityDef is not already on the viewEntity list, create
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a viewEntity and add it to the list with an empty scissor rect.
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=============
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*/
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viewEntity_t *R_SetEntityDefViewEntity( idRenderEntityLocal *def ) {
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if ( def->viewCount == tr.viewCount ) {
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// already set up for this frame
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return def->viewEntity;
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}
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def->viewCount = tr.viewCount;
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viewEntity_t * vModel = (viewEntity_t *)R_ClearedFrameAlloc( sizeof( *vModel ), FRAME_ALLOC_VIEW_ENTITY );
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vModel->entityDef = def;
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// the scissorRect will be expanded as the model bounds is accepted into visible portal chains
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// It will remain clear if the model is only needed for shadows.
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vModel->scissorRect.Clear();
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vModel->next = tr.viewDef->viewEntitys;
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tr.viewDef->viewEntitys = vModel;
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def->viewEntity = vModel;
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return vModel;
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}
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/*
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================
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CullEntityByPortals
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Return true if the entity reference bounds do not intersect the current portal chain.
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================
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*/
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bool idRenderWorldLocal::CullEntityByPortals( const idRenderEntityLocal *entity, const portalStack_t *ps ) {
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if ( r_useEntityPortalCulling.GetInteger() == 1 ) {
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ALIGNTYPE16 frustumCorners_t corners;
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idRenderMatrix::GetFrustumCorners( corners, entity->inverseBaseModelProject, bounds_unitCube );
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for ( int i = 0; i < ps->numPortalPlanes; i++ ) {
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if ( idRenderMatrix::CullFrustumCornersToPlane( corners, ps->portalPlanes[i] ) == FRUSTUM_CULL_FRONT ) {
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return true;
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}
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}
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} else if ( r_useEntityPortalCulling.GetInteger() >= 2 ) {
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idRenderMatrix baseModelProject;
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idRenderMatrix::Inverse( entity->inverseBaseModelProject, baseModelProject );
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idPlane frustumPlanes[6];
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idRenderMatrix::GetFrustumPlanes( frustumPlanes, baseModelProject, false, true );
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// exact clip of light faces against all planes
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for ( int i = 0; i < 6; i++ ) {
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// the entity frustum planes face inward, so the planes that have the
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// view origin on the positive side will be the "back" faces of the entity,
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// which must have some fragment inside the portal stack planes to be visible
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if ( frustumPlanes[i].Distance( tr.viewDef->renderView.vieworg ) <= 0.0f ) {
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continue;
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}
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// calculate a winding for this frustum side
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idFixedWinding w;
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w.BaseForPlane( frustumPlanes[i] );
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for ( int j = 0; j < 6; j++ ) {
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if ( j == i ) {
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continue;
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}
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if ( !w.ClipInPlace( frustumPlanes[j], ON_EPSILON ) ) {
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break;
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}
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}
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if ( w.GetNumPoints() <= 2 ) {
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continue;
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}
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assert( ps->numPortalPlanes <= MAX_PORTAL_PLANES );
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assert( w.GetNumPoints() + ps->numPortalPlanes < MAX_POINTS_ON_WINDING );
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// now clip the winding against each of the portalStack planes
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// skip the last plane which is the last portal itself
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for ( int j = 0; j < ps->numPortalPlanes - 1; j++ ) {
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if ( !w.ClipInPlace( -ps->portalPlanes[j], ON_EPSILON ) ) {
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break;
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}
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}
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if ( w.GetNumPoints() > 2 ) {
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// part of the winding is visible through the portalStack,
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// so the entity is not culled
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return false;
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}
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}
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// nothing was visible
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return true;
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}
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return false;
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}
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/*
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===================
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AddAreaViewEntities
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Any models that are visible through the current portalStack will have their scissor rect updated.
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===================
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*/
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void idRenderWorldLocal::AddAreaViewEntities( int areaNum, const portalStack_t *ps ) {
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portalArea_t * area = &portalAreas[ areaNum ];
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for ( areaReference_t * ref = area->entityRefs.areaNext; ref != &area->entityRefs; ref = ref->areaNext ) {
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idRenderEntityLocal * entity = ref->entity;
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// debug tool to allow viewing of only one entity at a time
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if ( r_singleEntity.GetInteger() >= 0 && r_singleEntity.GetInteger() != entity->index ) {
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continue;
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}
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// remove decals that are completely faded away
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R_FreeEntityDefFadedDecals( entity, tr.viewDef->renderView.time[0] );
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// check for completely suppressing the model
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if ( !r_skipSuppress.GetBool() ) {
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if ( entity->parms.suppressSurfaceInViewID
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&& entity->parms.suppressSurfaceInViewID == tr.viewDef->renderView.viewID ) {
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continue;
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}
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if ( entity->parms.allowSurfaceInViewID
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&& entity->parms.allowSurfaceInViewID != tr.viewDef->renderView.viewID ) {
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continue;
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}
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}
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// cull reference bounds
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if ( CullEntityByPortals( entity, ps ) ) {
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// we are culled out through this portal chain, but it might
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// still be visible through others
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continue;
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}
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viewEntity_t * vEnt = R_SetEntityDefViewEntity( entity );
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// possibly expand the scissor rect
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vEnt->scissorRect.Union( ps->rect );
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}
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}
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/*
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================
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CullLightByPortals
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Return true if the light frustum does not intersect the current portal chain.
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================
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*/
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bool idRenderWorldLocal::CullLightByPortals( const idRenderLightLocal *light, const portalStack_t *ps ) {
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if ( r_useLightPortalCulling.GetInteger() == 1 ) {
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ALIGNTYPE16 frustumCorners_t corners;
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idRenderMatrix::GetFrustumCorners( corners, light->inverseBaseLightProject, bounds_zeroOneCube );
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for ( int i = 0; i < ps->numPortalPlanes; i++ ) {
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if ( idRenderMatrix::CullFrustumCornersToPlane( corners, ps->portalPlanes[i] ) == FRUSTUM_CULL_FRONT ) {
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return true;
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}
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}
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} else if ( r_useLightPortalCulling.GetInteger() >= 2 ) {
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idPlane frustumPlanes[6];
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idRenderMatrix::GetFrustumPlanes( frustumPlanes, light->baseLightProject, true, true );
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// exact clip of light faces against all planes
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for ( int i = 0; i < 6; i++ ) {
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// the light frustum planes face inward, so the planes that have the
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// view origin on the positive side will be the "back" faces of the light,
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// which must have some fragment inside the the portal stack planes to be visible
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if ( frustumPlanes[i].Distance( tr.viewDef->renderView.vieworg ) <= 0.0f ) {
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continue;
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}
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// calculate a winding for this frustum side
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idFixedWinding w;
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w.BaseForPlane( frustumPlanes[i] );
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for ( int j = 0; j < 6; j++ ) {
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if ( j == i ) {
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continue;
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}
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if ( !w.ClipInPlace( frustumPlanes[j], ON_EPSILON ) ) {
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break;
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}
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}
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if ( w.GetNumPoints() <= 2 ) {
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continue;
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}
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assert( ps->numPortalPlanes <= MAX_PORTAL_PLANES );
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assert( w.GetNumPoints() + ps->numPortalPlanes < MAX_POINTS_ON_WINDING );
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// now clip the winding against each of the portalStack planes
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// skip the last plane which is the last portal itself
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for ( int j = 0; j < ps->numPortalPlanes - 1; j++ ) {
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if ( !w.ClipInPlace( -ps->portalPlanes[j], ON_EPSILON ) ) {
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break;
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}
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}
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if ( w.GetNumPoints() > 2 ) {
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// part of the winding is visible through the portalStack,
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// so the light is not culled
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return false;
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}
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}
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// nothing was visible
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return true;
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}
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return false;
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}
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/*
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===================
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AddAreaViewLights
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This is the only point where lights get added to the viewLights list.
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Any lights that are visible through the current portalStack will have their scissor rect updated.
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===================
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*/
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void idRenderWorldLocal::AddAreaViewLights( int areaNum, const portalStack_t *ps ) {
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portalArea_t * area = &portalAreas[ areaNum ];
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for ( areaReference_t * lref = area->lightRefs.areaNext; lref != &area->lightRefs; lref = lref->areaNext ) {
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idRenderLightLocal * light = lref->light;
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// debug tool to allow viewing of only one light at a time
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if ( r_singleLight.GetInteger() >= 0 && r_singleLight.GetInteger() != light->index ) {
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continue;
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}
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// check for being closed off behind a door
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// a light that doesn't cast shadows will still light even if it is behind a door
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if ( r_useLightAreaCulling.GetBool() && !light->LightCastsShadows()
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&& light->areaNum != -1 && !tr.viewDef->connectedAreas[ light->areaNum ] ) {
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continue;
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}
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// cull frustum
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if ( CullLightByPortals( light, ps ) ) {
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// we are culled out through this portal chain, but it might
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// still be visible through others
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continue;
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}
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viewLight_t * vLight = R_SetLightDefViewLight( light );
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// expand the scissor rect
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vLight->scissorRect.Union( ps->rect );
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}
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}
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/*
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===================
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AddAreaToView
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This may be entered multiple times with different planes
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if more than one portal sees into the area
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===================
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*/
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void idRenderWorldLocal::AddAreaToView( int areaNum, const portalStack_t *ps ) {
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// mark the viewCount, so r_showPortals can display the considered portals
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portalAreas[ areaNum ].viewCount = tr.viewCount;
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// add the models and lights, using more precise culling to the planes
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AddAreaViewEntities( areaNum, ps );
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AddAreaViewLights( areaNum, ps );
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}
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/*
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===================
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idRenderWorldLocal::ScreenRectForWinding
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===================
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*/
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idScreenRect idRenderWorldLocal::ScreenRectFromWinding( const idWinding * w, const viewEntity_t * space ) {
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const float viewWidth = (float) tr.viewDef->viewport.x2 - (float) tr.viewDef->viewport.x1;
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const float viewHeight = (float) tr.viewDef->viewport.y2 - (float) tr.viewDef->viewport.y1;
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idScreenRect r;
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r.Clear();
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for ( int i = 0; i < w->GetNumPoints(); i++ ) {
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idVec3 v;
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idVec3 ndc;
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R_LocalPointToGlobal( space->modelMatrix, (*w)[i].ToVec3(), v );
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R_GlobalToNormalizedDeviceCoordinates( v, ndc );
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float windowX = ( ndc[0] * 0.5f + 0.5f ) * viewWidth;
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float windowY = ( ndc[1] * 0.5f + 0.5f ) * viewHeight;
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r.AddPoint( windowX, windowY );
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}
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r.Expand();
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return r;
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}
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/*
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===================
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idRenderWorldLocal::PortalIsFoggedOut
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===================
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*/
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bool idRenderWorldLocal::PortalIsFoggedOut( const portal_t *p ) {
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idRenderLightLocal * ldef = p->doublePortal->fogLight;
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if ( ldef == NULL ) {
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return false;
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}
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// find the current density of the fog
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const idMaterial * lightShader = ldef->lightShader;
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const int size = lightShader->GetNumRegisters() * sizeof( float );
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float * regs = (float *)_alloca( size );
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lightShader->EvaluateRegisters( regs, ldef->parms.shaderParms,
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tr.viewDef->renderView.shaderParms, tr.viewDef->renderView.time[0] * 0.001f, ldef->parms.referenceSound );
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const shaderStage_t *stage = lightShader->GetStage(0);
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const float alpha = regs[ stage->color.registers[3] ];
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// if they left the default value on, set a fog distance of 500
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float a;
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if ( alpha <= 1.0f ) {
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a = -0.5f / DEFAULT_FOG_DISTANCE;
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} else {
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// otherwise, distance = alpha color
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a = -0.5f / alpha;
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}
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idPlane forward;
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forward[0] = a * tr.viewDef->worldSpace.modelViewMatrix[0*4+2];
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forward[1] = a * tr.viewDef->worldSpace.modelViewMatrix[1*4+2];
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forward[2] = a * tr.viewDef->worldSpace.modelViewMatrix[2*4+2];
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forward[3] = a * tr.viewDef->worldSpace.modelViewMatrix[3*4+2];
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const idWinding * w = p->w;
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for ( int i = 0; i < w->GetNumPoints(); i++ ) {
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const float d = forward.Distance( (*w)[i].ToVec3() );
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if ( d < 0.5f ) {
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return false; // a point not clipped off
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}
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}
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return true;
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}
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/*
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===================
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idRenderWorldLocal::FloodViewThroughArea_r
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===================
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*/
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void idRenderWorldLocal::FloodViewThroughArea_r( const idVec3 & origin, int areaNum, const portalStack_t *ps ) {
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portalArea_t * area = &portalAreas[ areaNum ];
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// cull models and lights to the current collection of planes
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AddAreaToView( areaNum, ps );
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if ( areaScreenRect[areaNum].IsEmpty() ) {
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areaScreenRect[areaNum] = ps->rect;
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} else {
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areaScreenRect[areaNum].Union( ps->rect );
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}
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// go through all the portals
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for ( const portal_t * p = area->portals; p != NULL; p = p->next ) {
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// an enclosing door may have sealed the portal off
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if ( p->doublePortal->blockingBits & PS_BLOCK_VIEW ) {
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continue;
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}
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// make sure this portal is facing away from the view
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const float d = p->plane.Distance( origin );
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if ( d < -0.1f ) {
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continue;
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}
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// make sure the portal isn't in our stack trace,
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// which would cause an infinite loop
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const portalStack_t * check = ps;
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for ( ; check != NULL; check = check->next ) {
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if ( check->p == p ) {
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break; // don't recursively enter a stack
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}
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}
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if ( check ) {
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continue; // already in stack
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}
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// if we are very close to the portal surface, don't bother clipping
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// it, which tends to give epsilon problems that make the area vanish
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if ( d < 1.0f ) {
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// go through this portal
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portalStack_t newStack;
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newStack = *ps;
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newStack.p = p;
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newStack.next = ps;
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FloodViewThroughArea_r( origin, p->intoArea, &newStack );
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continue;
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}
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// clip the portal winding to all of the planes
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idFixedWinding w; // we won't overflow because MAX_PORTAL_PLANES = 20
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w = *p->w;
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for ( int j = 0; j < ps->numPortalPlanes; j++ ) {
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if ( !w.ClipInPlace( -ps->portalPlanes[j], 0 ) ) {
|
|
break;
|
|
}
|
|
}
|
|
if ( !w.GetNumPoints() ) {
|
|
continue; // portal not visible
|
|
}
|
|
|
|
// see if it is fogged out
|
|
if ( PortalIsFoggedOut( p ) ) {
|
|
continue;
|
|
}
|
|
|
|
// go through this portal
|
|
portalStack_t newStack;
|
|
newStack.p = p;
|
|
newStack.next = ps;
|
|
|
|
// find the screen pixel bounding box of the remaining portal
|
|
// so we can scissor things outside it
|
|
newStack.rect = ScreenRectFromWinding( &w, &tr.identitySpace );
|
|
|
|
// slop might have spread it a pixel outside, so trim it back
|
|
newStack.rect.Intersect( ps->rect );
|
|
|
|
// generate a set of clipping planes that will further restrict
|
|
// the visible view beyond just the scissor rect
|
|
|
|
int addPlanes = w.GetNumPoints();
|
|
if ( addPlanes > MAX_PORTAL_PLANES ) {
|
|
addPlanes = MAX_PORTAL_PLANES;
|
|
}
|
|
|
|
newStack.numPortalPlanes = 0;
|
|
for ( int i = 0; i < addPlanes; i++ ) {
|
|
int j = i + 1;
|
|
if ( j == w.GetNumPoints() ) {
|
|
j = 0;
|
|
}
|
|
|
|
const idVec3 & v1 = origin - w[i].ToVec3();
|
|
const idVec3 & v2 = origin - w[j].ToVec3();
|
|
|
|
newStack.portalPlanes[newStack.numPortalPlanes].Normal().Cross( v2, v1 );
|
|
|
|
// if it is degenerate, skip the plane
|
|
if ( newStack.portalPlanes[newStack.numPortalPlanes].Normalize() < 0.01f ) {
|
|
continue;
|
|
}
|
|
newStack.portalPlanes[newStack.numPortalPlanes].FitThroughPoint( origin );
|
|
|
|
newStack.numPortalPlanes++;
|
|
}
|
|
|
|
// the last stack plane is the portal plane
|
|
newStack.portalPlanes[newStack.numPortalPlanes] = p->plane;
|
|
newStack.numPortalPlanes++;
|
|
|
|
FloodViewThroughArea_r( origin, p->intoArea, &newStack );
|
|
}
|
|
}
|
|
|
|
/*
|
|
=======================
|
|
idRenderWorldLocal::FlowViewThroughPortals
|
|
|
|
Finds viewLights and viewEntities by flowing from an origin through the visible
|
|
portals that the origin point can see into. The planes array defines a volume with
|
|
the planes pointing outside the volume. Zero planes assumes an unbounded volume.
|
|
=======================
|
|
*/
|
|
void idRenderWorldLocal::FlowViewThroughPortals( const idVec3 & origin, int numPlanes, const idPlane *planes ) {
|
|
portalStack_t ps;
|
|
ps.next = NULL;
|
|
ps.p = NULL;
|
|
|
|
assert( numPlanes <= MAX_PORTAL_PLANES );
|
|
for ( int i = 0; i < numPlanes; i++ ) {
|
|
ps.portalPlanes[i] = planes[i];
|
|
}
|
|
|
|
ps.numPortalPlanes = numPlanes;
|
|
ps.rect = tr.viewDef->scissor;
|
|
|
|
// if outside the world, mark everything
|
|
if ( tr.viewDef->areaNum < 0 ){
|
|
for ( int i = 0; i < numPortalAreas; i++ ) {
|
|
areaScreenRect[i] = tr.viewDef->scissor;
|
|
AddAreaToView( i, &ps );
|
|
}
|
|
} else {
|
|
// flood out through portals, setting area viewCount
|
|
FloodViewThroughArea_r( origin, tr.viewDef->areaNum, &ps );
|
|
}
|
|
}
|
|
|
|
/*
|
|
===================
|
|
idRenderWorldLocal::BuildConnectedAreas_r
|
|
===================
|
|
*/
|
|
void idRenderWorldLocal::BuildConnectedAreas_r( int areaNum ) {
|
|
if ( tr.viewDef->connectedAreas[areaNum] ) {
|
|
return;
|
|
}
|
|
|
|
tr.viewDef->connectedAreas[areaNum] = true;
|
|
|
|
// flood through all non-blocked portals
|
|
portalArea_t * area = &portalAreas[ areaNum ];
|
|
for ( const portal_t * portal = area->portals; portal; portal = portal->next ) {
|
|
if ( ( portal->doublePortal->blockingBits & PS_BLOCK_VIEW ) == 0 ) {
|
|
BuildConnectedAreas_r( portal->intoArea );
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
===================
|
|
idRenderWorldLocal::BuildConnectedAreas
|
|
|
|
This is only valid for a given view, not all views in a frame
|
|
===================
|
|
*/
|
|
void idRenderWorldLocal::BuildConnectedAreas() {
|
|
tr.viewDef->connectedAreas = (bool *)R_FrameAlloc( numPortalAreas * sizeof( tr.viewDef->connectedAreas[0] ) );
|
|
|
|
// if we are outside the world, we can see all areas
|
|
if ( tr.viewDef->areaNum == -1 ) {
|
|
for ( int i = 0; i < numPortalAreas; i++ ) {
|
|
tr.viewDef->connectedAreas[i] = true;
|
|
}
|
|
return;
|
|
}
|
|
|
|
// start with none visible, and flood fill from the current area
|
|
memset( tr.viewDef->connectedAreas, 0, numPortalAreas * sizeof( tr.viewDef->connectedAreas[0] ) );
|
|
BuildConnectedAreas_r( tr.viewDef->areaNum );
|
|
}
|
|
|
|
/*
|
|
=============
|
|
idRenderWorldLocal::FindViewLightsAndEntites
|
|
|
|
All the modelrefs and lightrefs that are in visible areas
|
|
will have viewEntitys and viewLights created for them.
|
|
|
|
The scissorRects on the viewEntitys and viewLights may be empty if
|
|
they were considered, but not actually visible.
|
|
|
|
Entities and lights can have cached viewEntities / viewLights that
|
|
will be used if the viewCount variable matches.
|
|
=============
|
|
*/
|
|
void idRenderWorldLocal::FindViewLightsAndEntities() {
|
|
SCOPED_PROFILE_EVENT( "FindViewLightsAndEntities" );
|
|
|
|
// bumping this counter invalidates cached viewLights / viewEntities,
|
|
// when a light or entity is next considered, it will create a new
|
|
// viewLight / viewEntity
|
|
tr.viewCount++;
|
|
|
|
// clear the visible lightDef and entityDef lists
|
|
tr.viewDef->viewLights = NULL;
|
|
tr.viewDef->viewEntitys = NULL;
|
|
|
|
// all areas are initially not visible, but each portal
|
|
// chain that leads to them will expand the visible rectangle
|
|
for ( int i = 0; i < numPortalAreas; i++ ) {
|
|
areaScreenRect[i].Clear();
|
|
}
|
|
|
|
// find the area to start the portal flooding in
|
|
if ( !r_usePortals.GetBool() ) {
|
|
// debug tool to force no portal culling
|
|
tr.viewDef->areaNum = -1;
|
|
} else {
|
|
tr.viewDef->areaNum = PointInArea( tr.viewDef->initialViewAreaOrigin );
|
|
}
|
|
|
|
// determine all possible connected areas for
|
|
// light-behind-door culling
|
|
BuildConnectedAreas();
|
|
|
|
// flow through all the portals and add models / lights
|
|
if ( r_singleArea.GetBool() ) {
|
|
// if debugging, only mark this area
|
|
// if we are outside the world, don't draw anything
|
|
if ( tr.viewDef->areaNum >= 0 ) {
|
|
static int lastPrintedAreaNum;
|
|
if ( tr.viewDef->areaNum != lastPrintedAreaNum ) {
|
|
lastPrintedAreaNum = tr.viewDef->areaNum;
|
|
common->Printf( "entering portal area %i\n", tr.viewDef->areaNum );
|
|
}
|
|
|
|
portalStack_t ps;
|
|
for ( int i = 0; i < 5; i++ ) {
|
|
ps.portalPlanes[i] = tr.viewDef->frustum[i];
|
|
}
|
|
ps.numPortalPlanes = 5;
|
|
ps.rect = tr.viewDef->scissor;
|
|
|
|
AddAreaToView( tr.viewDef->areaNum, &ps );
|
|
}
|
|
} else {
|
|
// note that the center of projection for flowing through portals may
|
|
// be a different point than initialViewAreaOrigin for subviews that
|
|
// may have the viewOrigin in a solid/invalid area
|
|
FlowViewThroughPortals( tr.viewDef->renderView.vieworg, 5, tr.viewDef->frustum );
|
|
}
|
|
}
|
|
|
|
/*
|
|
=======================================================================
|
|
|
|
Light linking into the BSP tree by flooding through portals
|
|
|
|
=======================================================================
|
|
*/
|
|
|
|
/*
|
|
===================
|
|
idRenderWorldLocal::FloodLightThroughArea_r
|
|
===================
|
|
*/
|
|
void idRenderWorldLocal::FloodLightThroughArea_r( idRenderLightLocal *light, int areaNum,
|
|
const portalStack_t *ps ) {
|
|
assert( ps != NULL ); // compiler warning
|
|
portal_t* p = NULL;
|
|
float d;
|
|
portalArea_t * area = NULL;
|
|
const portalStack_t *check = NULL, *firstPortalStack = NULL;
|
|
portalStack_t newStack;
|
|
int i, j;
|
|
idVec3 v1, v2;
|
|
int addPlanes;
|
|
idFixedWinding w; // we won't overflow because MAX_PORTAL_PLANES = 20
|
|
|
|
area = &portalAreas[ areaNum ];
|
|
|
|
// add an areaRef
|
|
AddLightRefToArea( light, area );
|
|
|
|
// go through all the portals
|
|
for ( p = area->portals; p; p = p->next ) {
|
|
// make sure this portal is facing away from the view
|
|
d = p->plane.Distance( light->globalLightOrigin );
|
|
if ( d < -0.1f ) {
|
|
continue;
|
|
}
|
|
|
|
// make sure the portal isn't in our stack trace,
|
|
// which would cause an infinite loop
|
|
for ( check = ps; check; check = check->next ) {
|
|
firstPortalStack = check;
|
|
if ( check->p == p ) {
|
|
break; // don't recursively enter a stack
|
|
}
|
|
}
|
|
if ( check ) {
|
|
continue; // already in stack
|
|
}
|
|
|
|
// if we are very close to the portal surface, don't bother clipping
|
|
// it, which tends to give epsilon problems that make the area vanish
|
|
if ( d < 1.0f ) {
|
|
// go through this portal
|
|
newStack = *ps;
|
|
newStack.p = p;
|
|
newStack.next = ps;
|
|
FloodLightThroughArea_r( light, p->intoArea, &newStack );
|
|
continue;
|
|
}
|
|
|
|
// clip the portal winding to all of the planes
|
|
w = *p->w;
|
|
for ( j = 0; j < ps->numPortalPlanes; j++ ) {
|
|
if ( !w.ClipInPlace( -ps->portalPlanes[j], 0 ) ) {
|
|
break;
|
|
}
|
|
}
|
|
if ( !w.GetNumPoints() ) {
|
|
continue; // portal not visible
|
|
}
|
|
// also always clip to the original light planes, because they aren't
|
|
// necessarily extending to infinitiy like a view frustum
|
|
for ( j = 0; j < firstPortalStack->numPortalPlanes; j++ ) {
|
|
if ( !w.ClipInPlace( -firstPortalStack->portalPlanes[j], 0 ) ) {
|
|
break;
|
|
}
|
|
}
|
|
if ( !w.GetNumPoints() ) {
|
|
continue; // portal not visible
|
|
}
|
|
|
|
// go through this portal
|
|
newStack.p = p;
|
|
newStack.next = ps;
|
|
|
|
// generate a set of clipping planes that will further restrict
|
|
// the visible view beyond just the scissor rect
|
|
|
|
addPlanes = w.GetNumPoints();
|
|
if ( addPlanes > MAX_PORTAL_PLANES ) {
|
|
addPlanes = MAX_PORTAL_PLANES;
|
|
}
|
|
|
|
newStack.numPortalPlanes = 0;
|
|
for ( i = 0; i < addPlanes; i++ ) {
|
|
j = i+1;
|
|
if ( j == w.GetNumPoints() ) {
|
|
j = 0;
|
|
}
|
|
|
|
v1 = light->globalLightOrigin - w[i].ToVec3();
|
|
v2 = light->globalLightOrigin - w[j].ToVec3();
|
|
|
|
newStack.portalPlanes[newStack.numPortalPlanes].Normal().Cross( v2, v1 );
|
|
|
|
// if it is degenerate, skip the plane
|
|
if ( newStack.portalPlanes[newStack.numPortalPlanes].Normalize() < 0.01f ) {
|
|
continue;
|
|
}
|
|
newStack.portalPlanes[newStack.numPortalPlanes].FitThroughPoint( light->globalLightOrigin );
|
|
|
|
newStack.numPortalPlanes++;
|
|
}
|
|
|
|
FloodLightThroughArea_r( light, p->intoArea, &newStack );
|
|
}
|
|
}
|
|
|
|
/*
|
|
=======================
|
|
idRenderWorldLocal::FlowLightThroughPortals
|
|
|
|
Adds an arearef in each area that the light center flows into.
|
|
This can only be used for shadow casting lights that have a generated
|
|
prelight, because shadows are cast from back side which may not be in visible areas.
|
|
=======================
|
|
*/
|
|
void idRenderWorldLocal::FlowLightThroughPortals( idRenderLightLocal *light ) {
|
|
// if the light origin areaNum is not in a valid area,
|
|
// the light won't have any area refs
|
|
if ( light->areaNum == -1 ) {
|
|
return;
|
|
}
|
|
|
|
idPlane frustumPlanes[6];
|
|
idRenderMatrix::GetFrustumPlanes( frustumPlanes, light->baseLightProject, true, true );
|
|
|
|
portalStack_t ps;
|
|
memset( &ps, 0, sizeof( ps ) );
|
|
ps.numPortalPlanes = 6;
|
|
for ( int i = 0; i < 6; i++ ) {
|
|
ps.portalPlanes[i] = -frustumPlanes[i];
|
|
}
|
|
|
|
FloodLightThroughArea_r( light, light->areaNum, &ps );
|
|
}
|
|
|
|
/*
|
|
=======================================================================
|
|
|
|
Portal State Management
|
|
|
|
=======================================================================
|
|
*/
|
|
|
|
/*
|
|
==============
|
|
NumPortals
|
|
==============
|
|
*/
|
|
int idRenderWorldLocal::NumPortals() const {
|
|
return numInterAreaPortals;
|
|
}
|
|
|
|
/*
|
|
==============
|
|
FindPortal
|
|
|
|
Game code uses this to identify which portals are inside doors.
|
|
Returns 0 if no portal contacts the bounds
|
|
==============
|
|
*/
|
|
qhandle_t idRenderWorldLocal::FindPortal( const idBounds &b ) const {
|
|
int i, j;
|
|
idBounds wb;
|
|
doublePortal_t *portal;
|
|
idWinding *w;
|
|
|
|
for ( i = 0; i < numInterAreaPortals; i++ ) {
|
|
portal = &doublePortals[i];
|
|
w = portal->portals[0]->w;
|
|
|
|
wb.Clear();
|
|
for ( j = 0; j < w->GetNumPoints(); j++ ) {
|
|
wb.AddPoint( (*w)[j].ToVec3() );
|
|
}
|
|
if ( wb.IntersectsBounds( b ) ) {
|
|
return i + 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
=============
|
|
FloodConnectedAreas
|
|
=============
|
|
*/
|
|
void idRenderWorldLocal::FloodConnectedAreas( portalArea_t *area, int portalAttributeIndex ) {
|
|
if ( area->connectedAreaNum[portalAttributeIndex] == connectedAreaNum ) {
|
|
return;
|
|
}
|
|
area->connectedAreaNum[portalAttributeIndex] = connectedAreaNum;
|
|
|
|
for ( portal_t *p = area->portals; p != NULL; p = p->next ) {
|
|
if ( !(p->doublePortal->blockingBits & (1<<portalAttributeIndex) ) ) {
|
|
FloodConnectedAreas( &portalAreas[p->intoArea], portalAttributeIndex );
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
==============
|
|
AreasAreConnected
|
|
==============
|
|
*/
|
|
bool idRenderWorldLocal::AreasAreConnected( int areaNum1, int areaNum2, portalConnection_t connection ) const {
|
|
if ( areaNum1 == -1 || areaNum2 == -1 ) {
|
|
return false;
|
|
}
|
|
if ( areaNum1 > numPortalAreas || areaNum2 > numPortalAreas || areaNum1 < 0 || areaNum2 < 0 ) {
|
|
common->Error( "idRenderWorldLocal::AreAreasConnected: bad parms: %i, %i", areaNum1, areaNum2 );
|
|
}
|
|
|
|
int attribute = 0;
|
|
|
|
int intConnection = (int)connection;
|
|
|
|
while ( intConnection > 1 ) {
|
|
attribute++;
|
|
intConnection >>= 1;
|
|
}
|
|
if ( attribute >= NUM_PORTAL_ATTRIBUTES || ( 1 << attribute ) != (int)connection ) {
|
|
common->Error( "idRenderWorldLocal::AreasAreConnected: bad connection number: %i\n", (int)connection );
|
|
}
|
|
|
|
return portalAreas[areaNum1].connectedAreaNum[attribute] == portalAreas[areaNum2].connectedAreaNum[attribute];
|
|
}
|
|
|
|
/*
|
|
==============
|
|
SetPortalState
|
|
|
|
doors explicitly close off portals when shut
|
|
==============
|
|
*/
|
|
void idRenderWorldLocal::SetPortalState( qhandle_t portal, int blockTypes ) {
|
|
if ( portal == 0 ) {
|
|
return;
|
|
}
|
|
|
|
if ( portal < 1 || portal > numInterAreaPortals ) {
|
|
common->Error( "SetPortalState: bad portal number %i", portal );
|
|
}
|
|
int old = doublePortals[portal-1].blockingBits;
|
|
if ( old == blockTypes ) {
|
|
return;
|
|
}
|
|
doublePortals[portal-1].blockingBits = blockTypes;
|
|
|
|
// leave the connectedAreaGroup the same on one side,
|
|
// then flood fill from the other side with a new number for each changed attribute
|
|
for ( int i = 0; i < NUM_PORTAL_ATTRIBUTES; i++ ) {
|
|
if ( ( old ^ blockTypes ) & ( 1 << i ) ) {
|
|
connectedAreaNum++;
|
|
FloodConnectedAreas( &portalAreas[doublePortals[portal-1].portals[1]->intoArea], i );
|
|
}
|
|
}
|
|
|
|
if ( common->WriteDemo() ) {
|
|
common->WriteDemo()->WriteInt( DS_RENDER );
|
|
common->WriteDemo()->WriteInt( DC_SET_PORTAL_STATE );
|
|
common->WriteDemo()->WriteInt( portal );
|
|
common->WriteDemo()->WriteInt( blockTypes );
|
|
}
|
|
}
|
|
|
|
/*
|
|
==============
|
|
GetPortalState
|
|
==============
|
|
*/
|
|
int idRenderWorldLocal::GetPortalState( qhandle_t portal ) {
|
|
if ( portal == 0 ) {
|
|
return 0;
|
|
}
|
|
|
|
if ( portal < 1 || portal > numInterAreaPortals ) {
|
|
common->Error( "GetPortalState: bad portal number %i", portal );
|
|
}
|
|
|
|
return doublePortals[portal-1].blockingBits;
|
|
}
|
|
|
|
/*
|
|
=====================
|
|
idRenderWorldLocal::ShowPortals
|
|
|
|
Debugging tool, won't work correctly with SMP or when mirrors are present
|
|
=====================
|
|
*/
|
|
void idRenderWorldLocal::ShowPortals() {
|
|
int i, j;
|
|
portalArea_t *area;
|
|
portal_t *p;
|
|
idWinding *w;
|
|
|
|
// flood out through portals, setting area viewCount
|
|
for ( i = 0; i < numPortalAreas; i++ ) {
|
|
area = &portalAreas[i];
|
|
if ( area->viewCount != tr.viewCount ) {
|
|
continue;
|
|
}
|
|
for ( p = area->portals; p; p = p->next ) {
|
|
w = p->w;
|
|
if ( !w ) {
|
|
continue;
|
|
}
|
|
|
|
if ( portalAreas[ p->intoArea ].viewCount != tr.viewCount ) {
|
|
// red = can't see
|
|
GL_Color( 1, 0, 0 );
|
|
} else {
|
|
// green = see through
|
|
GL_Color( 0, 1, 0 );
|
|
}
|
|
|
|
qglBegin( GL_LINE_LOOP );
|
|
for ( j = 0; j < w->GetNumPoints(); j++ ) {
|
|
qglVertex3fv( (*w)[j].ToFloatPtr() );
|
|
}
|
|
qglEnd();
|
|
}
|
|
}
|
|
}
|