You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
3.0 KiB
133 lines
3.0 KiB
/* |
|
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_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; |
|
} |
|
|
|
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; |
|
}
|
|
|