CydandClaude Fable 5
db7745fcd0
Un-ignored: the dev drive is the ground truth the restoration and emulator work constantly reference (DPL3/LIBDPL + VRENDER i860 renderer source, BT/RP live+dev game trees, VGL_LABS pod boot, scene/audio content). Kept in-repo for the pod-owner community. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
62 lines
1.1 KiB
C++
62 lines
1.1 KiB
C++
#include <stdlib.h>
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#include <math.h>
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#include "dpltypes.h"
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#include "matrix.h"
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float billboard_rotY=0.0f;
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/*{{{ static float _atan2deg ( float dz, float dx )*/
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static float _atan2deg ( float dz, float dx )
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{
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float angle;
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if ((dx*dx) < 0.0001f) {
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angle=(dz>0) ? 90.0f : -90.0f;
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return angle;
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}
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else {
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return (180.0f / 3.1415926535f) * atan2 ( dz, dx );
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}
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}
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/*}}} */
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void billboardize ( dpl_MATRIX front, dpl_MATRIX back )
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{
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float dx, dy, dz;
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dx=front[3][0];
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dy=front[3][1];
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dz=front[3][2];
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dpl_Translate ( front, -dx, -dy, -dz );
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dpl_Rotate ( front, billboard_rotY, dpl_Y );
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dpl_Translate ( front, dx, dy, dz );
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if (back) dpl_Invert ( back, front );
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return;
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}
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void billboardstuff ( dpl_MATRIX m )
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{
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/* pass 0,0,-1 thru view matrix to find Y angle */
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dpl_POINT a, b;
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if (m) {
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a[0]= 0;
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a[1]= 0;
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a[2]= 0;
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dpl_XformPoint ( a, a, m );
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b[0]= 0;
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b[1]= 0;
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b[2]=-1;
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dpl_XformPoint ( b, b, m );
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billboard_rotY=90.0f - _atan2deg (b[2]-a[2], b[0]-a[0]);
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}
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}
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