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145 lines
3.3 KiB
145 lines
3.3 KiB
/* |
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gl_cull.c - render culling routines |
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Copyright (C) 2010 Uncle Mike |
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This program 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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This program 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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*/ |
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#include "gl_local.h" |
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#include "entity_types.h" |
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/* |
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============================================================= |
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FRUSTUM AND PVS CULLING |
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============================================================= |
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*/ |
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/* |
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================= |
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R_CullBox |
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Returns true if the box is completely outside the frustum |
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================= |
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*/ |
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qboolean R_CullBox( const vec3_t mins, const vec3_t maxs ) |
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{ |
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return GL_FrustumCullBox( &RI.frustum, mins, maxs, 0 ); |
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} |
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/* |
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================= |
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R_CullSphere |
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Returns true if the sphere is completely outside the frustum |
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================= |
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*/ |
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qboolean R_CullSphere( const vec3_t centre, const float radius ) |
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{ |
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return GL_FrustumCullSphere( &RI.frustum, centre, radius, 0 ); |
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} |
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/* |
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============= |
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R_CullModel |
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============= |
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*/ |
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int R_CullModel( cl_entity_t *e, const vec3_t absmin, const vec3_t absmax ) |
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{ |
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if( e == gEngfuncs.GetViewModel() ) |
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{ |
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if( ENGINE_GET_PARM( PARM_DEV_OVERVIEW )) |
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return 1; |
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if( RP_NORMALPASS() && !ENGINE_GET_PARM( PARM_THIRDPERSON ) && CL_IsViewEntityLocalPlayer()) |
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return 0; |
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return 1; |
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} |
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if( R_CullBox( absmin, absmax )) |
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return 1; |
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return 0; |
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} |
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/* |
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================= |
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R_CullSurface |
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cull invisible surfaces |
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================= |
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*/ |
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int R_CullSurface( msurface_t *surf, gl_frustum_t *frustum, uint clipflags ) |
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{ |
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cl_entity_t *e = RI.currententity; |
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if( !surf || !surf->texinfo || !surf->texinfo->texture ) |
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return CULL_OTHER; |
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if( r_nocull->value ) |
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return CULL_VISIBLE; |
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// world surfaces can be culled by vis frame too |
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if( RI.currententity == gEngfuncs.GetEntityByIndex( 0 ) && surf->visframe != tr.framecount ) |
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return CULL_VISFRAME; |
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// only static ents can be culled by frustum |
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if( !R_StaticEntity( e )) frustum = NULL; |
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if( !VectorIsNull( surf->plane->normal )) |
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{ |
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float dist; |
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// can use normal.z for world (optimisation) |
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if( RI.drawOrtho ) |
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{ |
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vec3_t orthonormal; |
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if( e == gEngfuncs.GetEntityByIndex( 0 ) ) orthonormal[2] = surf->plane->normal[2]; |
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else Matrix4x4_VectorRotate( RI.objectMatrix, surf->plane->normal, orthonormal ); |
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dist = orthonormal[2]; |
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} |
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else dist = PlaneDiff( tr.modelorg, surf->plane ); |
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if( glState.faceCull == GL_FRONT ) |
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{ |
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if( FBitSet( surf->flags, SURF_PLANEBACK )) |
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{ |
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if( dist >= -BACKFACE_EPSILON ) |
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return CULL_BACKSIDE; // wrong side |
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} |
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else |
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{ |
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if( dist <= BACKFACE_EPSILON ) |
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return CULL_BACKSIDE; // wrong side |
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} |
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} |
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else if( glState.faceCull == GL_BACK ) |
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{ |
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if( FBitSet( surf->flags, SURF_PLANEBACK )) |
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{ |
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if( dist <= BACKFACE_EPSILON ) |
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return CULL_BACKSIDE; // wrong side |
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} |
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else |
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{ |
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if( dist >= -BACKFACE_EPSILON ) |
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return CULL_BACKSIDE; // wrong side |
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} |
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} |
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} |
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if( frustum && GL_FrustumCullBox( frustum, surf->info->mins, surf->info->maxs, clipflags )) |
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return CULL_FRUSTUM; |
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return CULL_VISIBLE; |
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}
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