2006-03-20 16:43:15 +00:00
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/*
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2014-06-12 08:41:03 +00:00
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* This file is part of the DXX-Rebirth project <http://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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2006-03-20 16:43:15 +00:00
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/*
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*
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* Instancing routines
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*
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*/
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#include <stdlib.h>
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2012-07-07 18:35:06 +00:00
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#include "dxxerror.h"
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2006-03-20 16:43:15 +00:00
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#include "3d.h"
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#include "globvars.h"
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#define MAX_INSTANCE_DEPTH 5
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struct instance_context {
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vms_matrix m;
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vms_vector p;
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} instance_stack[MAX_INSTANCE_DEPTH];
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int instance_depth = 0;
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//instance at specified point with specified orientation
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//if matrix==NULL, don't modify matrix. This will be like doing an offset
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2013-06-08 22:24:17 +00:00
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void g3_start_instance_matrix(const vms_vector *pos,const vms_matrix *orient)
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2006-03-20 16:43:15 +00:00
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{
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vms_vector tempv;
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Assert(instance_depth<MAX_INSTANCE_DEPTH);
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instance_stack[instance_depth].m = View_matrix;
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instance_stack[instance_depth].p = View_position;
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instance_depth++;
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//step 1: subtract object position from view position
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vm_vec_sub(&tempv,&View_position,pos);
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if (orient) {
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//step 2: rotate view vector through object matrix
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vm_vec_rotate(&View_position,&tempv,orient);
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//step 3: rotate object matrix through view_matrix (vm = ob * vm)
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2014-07-13 17:37:41 +00:00
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View_matrix = vm_matrix_x_matrix(vm_transposed_matrix(*orient),View_matrix);
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2006-03-20 16:43:15 +00:00
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}
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}
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//instance at specified point with specified orientation
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//if angles==NULL, don't modify matrix. This will be like doing an offset
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2013-06-08 22:24:17 +00:00
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void g3_start_instance_angles(const vms_vector *pos,const vms_angvec *angles)
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2006-03-20 16:43:15 +00:00
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{
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vms_matrix tm;
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if (angles==NULL) {
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g3_start_instance_matrix(pos,NULL);
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return;
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}
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vm_angles_2_matrix(&tm,angles);
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g3_start_instance_matrix(pos,&tm);
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}
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//pops the old context
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void g3_done_instance()
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{
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instance_depth--;
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Assert(instance_depth >= 0);
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View_position = instance_stack[instance_depth].p;
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View_matrix = instance_stack[instance_depth].m;
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}
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