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/*
===========================================================================
Copyright (C) 2023 the OpenMoHAA team
This file is part of OpenMoHAA source code.
OpenMoHAA source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
OpenMoHAA source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenMoHAA source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
// tr_sky_portal.cpp: sky portal
#include "tr_local.h"
/*
=================
R_Sky_Init
=================
*/
void R_Sky_Init()
{
tr.viewParms.isPortalSky = qfalse;
tr.portalsky.numSurfs = 0;
}
/*
=================
R_Sky_Reset
=================
*/
void R_Sky_Reset()
{
if (tr.viewParms.isPortalSky) {
return;
}
tr.portalsky.mins[0] = 8192.0;
tr.portalsky.mins[1] = 8192.0;
tr.portalsky.mins[2] = 8192.0;
tr.portalsky.maxs[0] = -8192.0;
tr.portalsky.maxs[1] = -8192.0;
tr.portalsky.maxs[2] = -8192.0;
tr.portalsky.cntNode = 0;
tr.portalsky.numSurfs = 0;
}
/*
=================
R_Sky_AddSurf
=================
*/
void R_Sky_AddSurf(msurface_t *surf)
{
if (tr.viewParms.isPortalSky) {
static int last_sky_warning = 0;
if (tr.refdef.time - 1000 > last_sky_warning) {
ri.Printf(3, "WARNING: sky being drawn in a sky portal! Bad! Bad!\n");
last_sky_warning = tr.refdef.time;
}
return;
}
if (tr.portalsky.numSurfs < 32) {
tr.portalsky.skySurfs[tr.portalsky.numSurfs++] = surf;
}
if (tr.portalsky.cntNode) {
int i;
for (i = 0; i < 3; i++) {
if (tr.portalsky.mins[i] >= tr.portalsky.cntNode->mins[i]) {
tr.portalsky.mins[i] = tr.portalsky.cntNode->mins[i];
}
if (tr.portalsky.maxs[i] >= tr.portalsky.cntNode->maxs[i]) {
tr.portalsky.maxs[i] = tr.portalsky.cntNode->maxs[i];
}
}
}
}
/*
=================
R_Sky_Render
=================
*/
void R_Sky_Render()
{
int i;
viewParms_t newParms, oldParms;
mnode_t *leaf;
if (!tr.portalsky.numSurfs) {
return;
}
if (!tr.refdef.sky_portal) {
return;
}
if (tr.skyRendered) {
// already rendered
return;
}
if (tr.viewParms.isPortalSky) {
return;
}
for (i = 0; i < tr.portalsky.numSurfs; i++) {
if (!SurfIsOffscreen2(
(const srfBspSurface_t*)tr.portalsky.skySurfs[i]->data,
tr.portalsky.skySurfs[i]->shader,
ENTITYNUM_WORLD
)) {
break;
}
}
if (i == tr.portalsky.numSurfs) {
return;
}
oldParms = tr.viewParms;
newParms = tr.viewParms;
if (r_skyportal->integer) {
if (sscanf(
r_skyportal_origin->string,
"%f %f %f",
&newParms.or.origin[0],
&newParms.or.origin[1],
&newParms.or.origin[2]
)
!= 3) {
ri.Printf(PRINT_WARNING, "WARNING: Invalid sky portal origin: %s\n", r_skyportal_origin->string);
return;
}
} else {
VectorCopy(tr.refdef.sky_origin, newParms.or.origin);
MatrixMultiply(newParms.or.axis, tr.refdef.sky_axis, newParms.or.axis);
}
VectorCopy(newParms.or.origin, newParms.pvsOrigin);
newParms.isPortalSky = qtrue;
newParms.farplane_distance = tr.refdef.skybox_farplane;
newParms.renderTerrain = tr.refdef.render_terrain;
if (oldParms.farplane_bias == 0.0 || oldParms.farplane_distance == 0.0) {
newParms.farplane_bias = 0.0;
} else {
newParms.farplane_bias = newParms.farplane_distance / oldParms.farplane_distance * oldParms.farplane_bias;
}
leaf = R_PointInLeaf(newParms.pvsOrigin);
if (leaf) {
R_RenderView(&newParms);
}
tr.viewParms = oldParms;
tr.portalsky.numSurfs = 0;
tr.skyRendered = qtrue;
R_RotateForViewer();
R_SetupFrustum();
}
/*
=================
R_Sky_ChangeFrustum
=================
*/
void R_Sky_ChangeFrustum()
{
cplane_t *frust;
int i;
vec3_t bounds[2];
vec3_t origin;
cplane_t abouts[4];
VectorCopy(tr.portalsky.mins, bounds[0]);
VectorCopy(tr.portalsky.maxs, bounds[1]);
VectorCopy(tr.viewParms.or.origin, origin);
VectorCopy(tr.viewParms.or.axis[2], abouts[0].normal);
VectorNegate(tr.viewParms.or.axis[2], abouts[1].normal);
VectorCopy(tr.viewParms.or.axis[1], abouts[2].normal);
VectorNegate(tr.viewParms.or.axis[1], abouts[3].normal);
for (i = 0; i < 4; i++) {
cplane_t out;
int i1;
float leastfov = 99999;
frust = &tr.viewParms.frustum[i];
abouts[i].dist = DotProduct(tr.viewParms.or.origin, abouts[i].normal);
CrossProduct(frust->normal, abouts[i].normal, out.normal);
for (i1 = 0; i1 < 8; i1++) {
vec3_t point;
vec_t distFromFrustum;
float angle;
int i2;
for (i2 = 0; i2 < 3; i2++) {
point[i2] = bounds[i1 % 3][i2];
}
VectorSubtract(point, origin, point);
distFromFrustum = DotProduct(point, frust->normal);
if (distFromFrustum <= 0) {
break;
}
angle = atan2(DotProduct(point, out.normal), distFromFrustum);
if (angle >= 0) {
angle = RAD2DEG(angle);
if (leastfov > angle) {
leastfov = angle;
}
}
}
if (leastfov > 0 && leastfov < 180) {
RotatePointAroundVector(frust->normal, abouts[i].normal, frust->normal, leastfov);
VectorNormalize(frust->normal);
frust->type = PLANE_NON_AXIAL;
frust->dist = DotProduct(origin, frust->normal);
SetPlaneSignbits(frust);
}
}
}
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