57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <https://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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/*
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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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namespace dcx {
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static void scale_matrix(fix);
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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_position = view_pos;
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View_matrix = view_matrix;
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scale_matrix(zoom);
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}
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//performs aspect scaling on global view matrix
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static void scale_matrix(const fix View_zoom)
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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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}
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