104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
/*
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* Portions of this file are copyright Rebirth contributors and licensed as
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* described in COPYING.txt.
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* Portions of this file are copyright Parallax Software and licensed
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* according to the Parallax license below.
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* See COPYING.txt for license details.
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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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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#include "dxxerror.h"
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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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void g3_start_instance_matrix(const vms_vector *pos,const vms_matrix *orient)
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{
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vms_vector tempv;
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vms_matrix tempm,tempm2;
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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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vm_copy_transpose_matrix(&tempm2,orient);
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vm_matrix_x_matrix(&tempm,&tempm2,&View_matrix);
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View_matrix = tempm;
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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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void g3_start_instance_angles(const vms_vector *pos,const vms_angvec *angles)
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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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