80 lines
2.3 KiB
C++
80 lines
2.3 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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* Matrix setup & manipulation routines
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*
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*/
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#include "3d.h"
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#include "globvars.h"
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static void scale_matrix(void);
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//set view from x,y,z & p,b,h, zoom. Must call one of g3_set_view_*()
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void g3_set_view_angles(const vms_vector *view_pos,const vms_angvec *view_orient,fix zoom)
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{
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View_zoom = zoom;
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View_position = *view_pos;
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vm_angles_2_matrix(&View_matrix,view_orient);
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scale_matrix();
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}
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//set view from x,y,z, viewer matrix, and zoom. Must call one of g3_set_view_*()
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void g3_set_view_matrix(const vms_vector *view_pos,const vms_matrix *view_matrix,fix zoom)
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{
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View_zoom = zoom;
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View_position = *view_pos;
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View_matrix = *view_matrix;
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scale_matrix();
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}
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//performs aspect scaling on global view matrix
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static void scale_matrix(void)
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{
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Unscaled_matrix = View_matrix; //so we can use unscaled if we want
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Matrix_scale = Window_scale;
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if (View_zoom <= f1_0) //zoom in by scaling z
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Matrix_scale.z = fixmul(Matrix_scale.z,View_zoom);
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else { //zoom out by scaling x&y
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fix s = fixdiv(f1_0,View_zoom);
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Matrix_scale.x = fixmul(Matrix_scale.x,s);
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Matrix_scale.y = fixmul(Matrix_scale.y,s);
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}
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//now scale matrix elements
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vm_vec_scale(&View_matrix.rvec,Matrix_scale.x);
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vm_vec_scale(&View_matrix.uvec,Matrix_scale.y);
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vm_vec_scale(&View_matrix.fvec,Matrix_scale.z);
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}
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