mirror of
https://github.com/w23/xash3d-fwgs
synced 2024-12-15 21:50:59 +01:00
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/*
|
|
gl_cull.c - render culling routines
|
|
Copyright (C) 2010 Uncle Mike
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
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.
|
|
*/
|
|
|
|
#include "gl_local.h"
|
|
#include "entity_types.h"
|
|
|
|
/*
|
|
=============================================================
|
|
|
|
FRUSTUM AND PVS CULLING
|
|
|
|
=============================================================
|
|
*/
|
|
/*
|
|
=================
|
|
R_CullBox
|
|
|
|
Returns true if the box is completely outside the frustum
|
|
=================
|
|
*/
|
|
qboolean R_CullBox( const vec3_t mins, const vec3_t maxs )
|
|
{
|
|
return GL_FrustumCullBox( &RI.frustum, mins, maxs, 0 );
|
|
}
|
|
|
|
/*
|
|
=================
|
|
R_CullSphere
|
|
|
|
Returns true if the sphere is completely outside the frustum
|
|
=================
|
|
*/
|
|
qboolean R_CullSphere( const vec3_t centre, const float radius )
|
|
{
|
|
return GL_FrustumCullSphere( &RI.frustum, centre, radius, 0 );
|
|
}
|
|
|
|
/*
|
|
=============
|
|
R_CullModel
|
|
=============
|
|
*/
|
|
int R_CullModel( cl_entity_t *e, const vec3_t absmin, const vec3_t absmax )
|
|
{
|
|
if( e == gEngfuncs.GetViewModel() )
|
|
{
|
|
if( ENGINE_GET_PARM( PARM_DEV_OVERVIEW ))
|
|
return 1;
|
|
|
|
if( RP_NORMALPASS() && !ENGINE_GET_PARM( PARM_THIRDPERSON ) && CL_IsViewEntityLocalPlayer())
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
// local client can't view himself if camera or thirdperson is not active
|
|
if( RP_LOCALCLIENT( e ) && !ENGINE_GET_PARM( PARM_THIRDPERSON ) && CL_IsViewEntityLocalPlayer())
|
|
return 1;
|
|
|
|
if( R_CullBox( absmin, absmax ))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
=================
|
|
R_CullSurface
|
|
|
|
cull invisible surfaces
|
|
=================
|
|
*/
|
|
int R_CullSurface( msurface_t *surf, gl_frustum_t *frustum, uint clipflags )
|
|
{
|
|
cl_entity_t *e = RI.currententity;
|
|
|
|
if( !surf || !surf->texinfo || !surf->texinfo->texture )
|
|
return CULL_OTHER;
|
|
|
|
if( r_nocull->value )
|
|
return CULL_VISIBLE;
|
|
|
|
// world surfaces can be culled by vis frame too
|
|
if( RI.currententity == gEngfuncs.GetEntityByIndex( 0 ) && surf->visframe != tr.framecount )
|
|
return CULL_VISFRAME;
|
|
|
|
// only static ents can be culled by frustum
|
|
if( !R_StaticEntity( e )) frustum = NULL;
|
|
|
|
if( !VectorIsNull( surf->plane->normal ))
|
|
{
|
|
float dist;
|
|
|
|
// can use normal.z for world (optimisation)
|
|
if( RI.drawOrtho )
|
|
{
|
|
vec3_t orthonormal;
|
|
|
|
if( e == gEngfuncs.GetEntityByIndex( 0 ) ) orthonormal[2] = surf->plane->normal[2];
|
|
else Matrix4x4_VectorRotate( RI.objectMatrix, surf->plane->normal, orthonormal );
|
|
dist = orthonormal[2];
|
|
}
|
|
else dist = PlaneDiff( tr.modelorg, surf->plane );
|
|
|
|
if( glState.faceCull == GL_FRONT )
|
|
{
|
|
if( FBitSet( surf->flags, SURF_PLANEBACK ))
|
|
{
|
|
if( dist >= -BACKFACE_EPSILON )
|
|
return CULL_BACKSIDE; // wrong side
|
|
}
|
|
else
|
|
{
|
|
if( dist <= BACKFACE_EPSILON )
|
|
return CULL_BACKSIDE; // wrong side
|
|
}
|
|
}
|
|
else if( glState.faceCull == GL_BACK )
|
|
{
|
|
if( FBitSet( surf->flags, SURF_PLANEBACK ))
|
|
{
|
|
if( dist <= BACKFACE_EPSILON )
|
|
return CULL_BACKSIDE; // wrong side
|
|
}
|
|
else
|
|
{
|
|
if( dist >= -BACKFACE_EPSILON )
|
|
return CULL_BACKSIDE; // wrong side
|
|
}
|
|
}
|
|
}
|
|
|
|
if( frustum && GL_FrustumCullBox( frustum, surf->info->mins, surf->info->maxs, clipflags ))
|
|
return CULL_FRUSTUM;
|
|
|
|
return CULL_VISIBLE;
|
|
}
|