mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-14 08:50:58 +00:00
bce7d5b832
This moves the common camera setup code out of the individual drivers, and completely removes vup/vright/vpn from the non-software renderers. This has highlighted the craziness around AngleVectors with it putting +X forward, -Y right and +Z up. The main issue with this is it requires a 90 degree pre-rotation about the Z axis to get the camera pointing in the right direction, and that's for the native sw renderer (vulkan needs a 90 degree pre-rotation about X, and gl and glsl need to invert an axis, too), though at least it's just a matrix swizzle and vector negation. However, it does mean the camera matrices can't be used directly. Also rename vpn to vfwd (still abbreviated, but fwd is much clearer in meaning (to me, at least) than pn (plane normal, I guess, but which way?)).
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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r_billboard.c
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Billboard frame setup
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <string.h>
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#endif
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#include <math.h>
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#include "QF/render.h"
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#include "QF/sys.h"
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#include "QF/scene/entity.h"
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#include "r_internal.h"
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int
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R_BillboardFrame (entity_t *ent, int orientation, const vec3_t cameravec,
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vec3_t bbup, vec3_t bbright, vec3_t bbfwd)
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{
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vec3_t tvec;
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float dot;
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switch (orientation) {
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case SPR_FACING_UPRIGHT:
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// the billboard has its up vector parallel with world up, and
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// its right vector perpendicular to cameravec.
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// Undefined if the camera is too close to the entity.
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VectorNegate (cameravec, tvec);
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VectorNormalize (tvec);
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dot = tvec[2]; // DotProduct (tvec, world up)
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if ((dot > 0.999848) || (dot < -0.999848)) // cos(1 degree)
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return 0;
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VectorSet (0, 0, 1, bbup);
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//CrossProduct(bbup, -cameravec, bbright)
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VectorSet (tvec[1], -tvec[0], 0, bbright);
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VectorNormalize (bbright);
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//CrossProduct (bbright, bbup, bbfwd)
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VectorSet (-bbright[1], bbright[0], 0, bbfwd);
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break;
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case SPR_VP_PARALLEL:
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// the billboard always has the same orientation as the camera
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VectorCopy (r_refdef.frame.up, bbup);
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VectorCopy (r_refdef.frame.right, bbright);
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VectorCopy (r_refdef.frame.forward, bbfwd);
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break;
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case SPR_VP_PARALLEL_UPRIGHT:
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// the billboar has its up vector parallel with world up, and
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// its right vector parallel with the view plane.
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// Undefined if the camera is looking straight up or down.
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dot = r_refdef.frame.forward[2];
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if ((dot > 0.999848) || (dot < -0.999848)) // cos(1 degree)
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return 0;
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VectorSet (0, 0, 1, bbup);
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VectorSet (r_refdef.frame.forward[1], -r_refdef.frame.forward[0], 0, bbright);
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VectorNormalize (bbright);
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VectorSet (-bbright[1], bbright[0], 0, bbfwd);
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break;
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case SPR_ORIENTED:
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{
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// The billboard's orientation is fully specified by the
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// entity's orientation.
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mat4f_t mat;
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Transform_GetWorldMatrix (ent->transform, mat);
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VectorCopy (mat[0], bbfwd);
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VectorNegate (mat[1], bbright);
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VectorCopy (mat[2], bbup);
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}
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break;
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case SPR_VP_PARALLEL_ORIENTED:
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{
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// The billboard is rotated relative to the camera using
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// the entity's local rotation.
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mat4f_t entmat;
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mat4f_t spmat;
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Transform_GetLocalMatrix (ent->transform, entmat);
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// FIXME needs proper testing (need to find, make, or fake a
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// parallel oriented sprite)
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mmulf (spmat, r_refdef.camera, entmat);
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VectorCopy (spmat[0], bbfwd);
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VectorNegate (spmat[1], bbright);
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VectorCopy (spmat[1], bbup);
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}
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break;
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default:
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Sys_Error ("R_BillboardFrame: Bad orientation %d", orientation);
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}
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return 1;
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}
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