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openmohaa/code/renderergl1/tr_light.c

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/*
===========================================================================
Copyright (C) 2015-2024 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_light.c
#include "tr_local.h"
#define DLIGHT_AT_RADIUS 16
// at the edge of a dlight's influence, this amount of light will be added
#define DLIGHT_MINIMUM_RADIUS 16
// never calculate a range less than this to prevent huge light numbers
typedef struct {
dlight_t *dl;
float power;
vec3_t origin;
} incidentLight_t;
typedef struct {
int dlightMap;
int allocated[LIGHTMAP_SIZE];
byte lightmap_buffer[LIGHTMAP_SIZE * LIGHTMAP_SIZE * 4];
byte *srcBase;
byte *dstBase;
incidentLight_t lights[32];
int numLights;
} dlightInfo_t;
typedef struct {
vec3_t point;
int s;
int t;
} patchLightBlock_t;
dlightInfo_t dli;
void R_SetupEntityLightingGrid(trRefEntity_t *ent);
qboolean R_DlightSample(byte *src, const vec3_t vec, byte *dst);
qboolean R_AllocLMBlock(int w, int h, int *x, int *y);
/*
===============
R_RecursiveDlightPatch
===============
*/
static int R_RecursiveDlightPatch(patchLightBlock_t *plb)
{
patchLightBlock_t cut[4];
qboolean added;
int index;
if (plb[0].s < plb[1].s - 1) {
cut[0] = plb[0];
cut[2] = plb[2];
VectorAdd(plb[0].point, plb[1].point, cut[1].point);
VectorScale(cut[1].point, 0.5f, cut[1].point);
VectorAdd(plb[2].point, plb[3].point, cut[3].point);
VectorScale(cut[3].point, 0.5f, cut[3].point);
cut[3].s = (plb[0].s + plb[1].s) >> 1;
cut[1].s = cut[3].s;
cut[1].t = plb[0].t;
cut[3].t = plb[2].t;
added = R_RecursiveDlightPatch(cut);
cut[0] = cut[1];
cut[2] = cut[3];
index = 1;
} else if (plb[0].t < plb[2].t - 1) {
cut[0] = plb[0];
cut[1] = plb[1];
VectorAdd(plb[0].point, plb[2].point, cut[2].point);
VectorScale(cut[2].point, 0.5f, cut[2].point);
VectorAdd(plb[1].point, plb[3].point, cut[3].point);
VectorScale(cut[3].point, 0.5f, cut[3].point);
cut[3].t = (plb[0].t + plb[2].t) >> 1;
cut[2].t = cut[3].t;
cut[2].s = plb[0].s;
cut[3].s = plb[1].s;
added = R_RecursiveDlightPatch(cut);
cut[0] = cut[2];
cut[1] = cut[3];
index = 2;
} else {
return R_DlightSample(
&dli.srcBase[plb[0].t * (LIGHTMAP_SIZE * 3) + plb[0].s * 3],
plb[0].point,
&dli.dstBase[plb[0].t * (LIGHTMAP_SIZE * 4) + plb[0].s * 4]
);
}
cut[index] = plb[index];
cut[3] = plb[3];
return R_RecursiveDlightPatch(cut) + added;
}
/*
===============
R_RealDlightPatch
===============
*/
int R_RealDlightPatch(srfGridMesh_t *srf, int dlightBits)
{
int x, y;
int i, j;
int i2, j2;
int steps[2][2];
dlight_t *dl;
qboolean added;
float *origin;
drawVert_t *dv;
if (!srf->lmHeight || !srf->lmWidth) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
dli.numLights = 0;
for (i = 0; i < tr.refdef.num_dlights; i++) {
if (!(dlightBits & (1 << i))) {
continue;
}
dl = &tr.refdef.dlights[i];
if (dl->origin[0] + dl->radius < srf->meshBounds[0][0] || dl->origin[0] - dl->radius > srf->meshBounds[1][0]
|| dl->origin[1] + dl->radius < srf->meshBounds[0][1] || dl->origin[1] - dl->radius > srf->meshBounds[1][1]
|| dl->origin[2] + dl->radius < srf->meshBounds[0][2]
|| dl->origin[2] - dl->radius > srf->meshBounds[1][2]) {
dlightBits &= ~(1 << i);
continue;
}
VectorCopy(dl->transformed, dli.lights[dli.numLights].origin);
dli.lights[dli.numLights].dl = dl;
dli.lights[dli.numLights].power = 1.f / dl->radius;
dli.numLights++;
}
if (!dli.numLights) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
if (!R_AllocLMBlock(srf->lmWidth, srf->lmHeight, &x, &y)) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
dli.srcBase = srf->lmData;
dli.dstBase = &dli.lightmap_buffer[y * 4 * LIGHTMAP_SIZE + x * 4];
srf->lightmapOffset[0] = (float)x / LIGHTMAP_SIZE - (float)srf->lmX / LIGHTMAP_SIZE;
srf->lightmapOffset[1] = (float)y / LIGHTMAP_SIZE - (float)srf->lmY / LIGHTMAP_SIZE;
tr.pc.c_dlightSurfaces++;
tr.pc.c_dlightTexels += srf->lmWidth * srf->lmHeight;
added = qfalse;
if (srf->verts[srf->width - 1].lightmap[0] != srf->verts[0].lightmap[0]) {
if (srf->verts[srf->width - 1].lightmap[0] < srf->verts[0].lightmap[0]) {
steps[0][0] = 0;
steps[0][1] = -1;
} else {
steps[0][0] = 0;
steps[0][1] = 1;
}
if (srf->verts[srf->width * (srf->height - 1)].lightmap[1] < srf->verts[0].lightmap[1]) {
steps[1][0] = -1;
steps[1][1] = 0;
} else {
steps[1][0] = 1;
steps[1][1] = 0;
}
} else {
if (srf->verts[srf->width * (srf->height - 1)].lightmap[0] < srf->verts[0].lightmap[0]) {
steps[0][0] = -1;
steps[0][1] = 0;
} else {
steps[0][0] = 1;
steps[0][1] = 0;
}
if (srf->verts[srf->width - 1].lightmap[1] < srf->verts[0].lightmap[1]) {
steps[1][0] = 0;
steps[1][1] = -1;
} else {
steps[1][0] = 0;
steps[1][1] = 1;
}
}
for (i = 0; i < srf->height; i++) {
for (j = 0; j < srf->width; j++) {
patchLightBlock_t plb[4];
//
// Vert 1
//
dv = &srf->verts[i * srf->width + j];
VectorCopy(dv->xyz, plb[0].point);
plb[0].s = (int)(dv->lightmap[0] * LIGHTMAP_SIZE) - srf->lmX;
plb[0].t = (int)(dv->lightmap[1] * LIGHTMAP_SIZE) - srf->lmY;
//
// Vert 2
//
i2 = Q_clamp_int(steps[0][0] + i, 0, srf->height - 1);
j2 = Q_clamp_int(steps[0][1] + j, 0, srf->width - 1);
dv = &srf->verts[i2 * srf->width + j2];
VectorCopy(dv->xyz, plb[1].point);
plb[1].s = (int)(dv->lightmap[0] * LIGHTMAP_SIZE) - srf->lmX;
plb[1].t = (int)(dv->lightmap[1] * LIGHTMAP_SIZE) - srf->lmY;
//
// Vert 3
//
i2 = Q_clamp_int(steps[1][0] + i, 0, srf->height - 1);
j2 = Q_clamp_int(steps[1][1] + j, 0, srf->width - 1);
dv = &srf->verts[i2 * srf->width + j2];
VectorCopy(dv->xyz, plb[2].point);
plb[2].s = (int)(dv->lightmap[0] * LIGHTMAP_SIZE) - srf->lmX;
plb[2].t = (int)(dv->lightmap[1] * LIGHTMAP_SIZE) - srf->lmY;
//
// Vert 4
//
i2 = Q_clamp_int(steps[1][0] + steps[0][0] + i, 0, srf->height - 1);
j2 = Q_clamp_int(steps[1][1] + steps[0][1] + j, 0, srf->width - 1);
dv = &srf->verts[i2 * srf->width + j2];
VectorCopy(dv->xyz, plb[3].point);
plb[3].s = (int)(dv->lightmap[0] * LIGHTMAP_SIZE) - srf->lmX;
plb[3].t = (int)(dv->lightmap[1] * LIGHTMAP_SIZE) - srf->lmY;
added |= R_RecursiveDlightPatch(plb);
}
}
if (!added) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
for (i = 0; i < srf->lmWidth; i++) {
dli.allocated[x + i] = srf->lmHeight + y;
}
srf->dlightMap[tr.smpFrame] = dli.dlightMap + 1;
return srf->dlightMap[tr.smpFrame];
}
/*
===============
R_RealDlightFace
===============
*/
int R_RealDlightFace(srfSurfaceFace_t *srf, int dlightBits)
{
int x, y;
byte *src, *dst;
int i, j;
vec3_t vec;
vec3_t vecStepS, vecStepT;
dlight_t *dl;
float d;
qboolean added;
float *origin;
if (!srf->lmHeight || !srf->lmWidth) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
dli.numLights = 0;
for (i = 0; i < tr.refdef.num_dlights; i++) {
if (!(dlightBits & (1 << i))) {
continue;
}
dl = &tr.refdef.dlights[i];
d = DotProduct(dl->transformed, srf->plane.normal) - srf->plane.dist;
if ((d < 0.f && !r_dlightBacks->integer) || (d > dl->radius || d < -dl->radius)) {
// dlight doesn't reach the plane
dlightBits &= ~(1 << i);
} else {
VectorCopy(dl->transformed, dli.lights[dli.numLights].origin);
dli.lights[dli.numLights].dl = dl;
dli.lights[dli.numLights].power = 1.0 / dl->radius;
dli.numLights++;
}
}
if (!dli.numLights) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
if (!R_AllocLMBlock(srf->lmWidth, srf->lmHeight, &x, &y)) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
src = srf->lmData;
dst = &dli.lightmap_buffer[y * 4 * LIGHTMAP_SIZE + x * 4];
srf->lightmapOffset[0] = (float)x / LIGHTMAP_SIZE - (float)srf->lmX / LIGHTMAP_SIZE;
srf->lightmapOffset[1] = (float)y / LIGHTMAP_SIZE - (float)srf->lmY / LIGHTMAP_SIZE;
tr.pc.c_dlightSurfaces++;
tr.pc.c_dlightTexels += srf->lmWidth * srf->lmHeight;
VectorCopy(srf->lmVecs[0], vecStepS);
VectorMA(srf->lmVecs[1], -srf->lmWidth, srf->lmVecs[0], vecStepT);
added = qfalse;
VectorCopy(srf->lmOrigin, vec);
for (i = 0; i < srf->lmHeight; i++) {
for (j = 0; j < srf->lmWidth; j++) {
added |= R_DlightSample(src, vec, dst);
VectorAdd(vec, vecStepS, vec);
src += 3;
dst += 4;
}
VectorAdd(vec, vecStepT, vec);
src += (LIGHTMAP_SIZE - j) * 3;
dst += (LIGHTMAP_SIZE - j) * 4;
}
if (!added) {
srf->dlightMap[tr.smpFrame] = 0;
return 0;
}
for (i = 0; i < srf->lmWidth; i++) {
dli.allocated[x + i] = srf->lmHeight + y;
}
srf->dlightMap[tr.smpFrame] = dli.dlightMap + 1;
return srf->dlightMap[tr.smpFrame];
}
/*
===============
R_RealDlightTerrain
===============
*/
int R_RealDlightTerrain(cTerraPatchUnpacked_t *srf, int dlightBits)
{
dlight_t *dl;
int x, y;
byte *dst, *src;
vec3_t vec;
float delta, dist;
float *origin;
int i, j, k;
int di, dj;
qboolean added;
float lmScale;
int lumelsPerHeight;
float heightPerLumelSquared;
float z00, z01;
float z10, z11;
dli.numLights = 0;
for (i = 0; i < tr.refdef.num_dlights; i++) {
dl = &tr.refdef.dlights[i];
if (dl->radius < srf->x0 - dl->transformed[0] || -512.f - dl->radius > srf->x0 - dl->transformed[0]
|| -512.f - dl->radius > srf->y0 - dl->transformed[1] || dl->radius < srf->y0 - dl->transformed[1]) {
continue;
}
if (dl->radius > 128.f) {
dist = 0.f;
delta = dl->transformed[0] - srf->x0;
if (delta <= 0.f) {
dist += delta * delta;
} else {
delta -= 512.f;
if (delta > 0.f) {
dist += delta * delta;
}
}
delta = dl->transformed[1] - srf->y0;
if (delta <= 0.f) {
dist += delta * delta;
} else {
delta -= 512.f;
if (delta > 0.f) {
dist += delta * delta;
}
}
delta = dl->transformed[2] - srf->z0;
if (delta <= 0.f) {
dist += delta * delta;
} else {
delta -= srf->zmax;
if (delta > 0.f) {
dist += delta * delta;
}
}
if (dl->radius * dl->radius < dist) {
continue;
}
}
VectorCopy(dl->origin, dli.lights[dli.numLights].origin);
dli.lights[dli.numLights].dl = dl;
dli.lights[dli.numLights].power = 1.f / dl->radius;
dli.numLights++;
}
if (!dli.numLights) {
srf->drawinfo.dlightMap[tr.smpFrame] = 0;
return 0;
}
if (!R_AllocLMBlock(srf->drawinfo.lmapSize, srf->drawinfo.lmapSize, &x, &y)) {
srf->drawinfo.dlightMap[tr.smpFrame] = 0;
return 0;
}
src = srf->drawinfo.lmData;
dst = &dli.lightmap_buffer[y * 4 * LIGHTMAP_SIZE + x * 4];
srf->drawinfo.lmapX = x / (float)LIGHTMAP_SIZE;
srf->drawinfo.lmapY = y / (float)LIGHTMAP_SIZE;
tr.pc.c_dlightSurfaces++;
tr.pc.c_dlightTexels += srf->drawinfo.lmapSize * srf->drawinfo.lmapSize;
added = qfalse;
lumelsPerHeight = 64.f / srf->drawinfo.lmapStep;
if (lumelsPerHeight == 1) {
vec[1] = srf->y0;
for (i = 0; i < 9; i++) {
vec[0] = srf->x0;
for (j = 0; j < 9; j++) {
vec[2] = srf->z0 + (int)(srf->heightmap[0] << 1);
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
vec[0] += srf->drawinfo.lmapStep;
}
src += (LIGHTMAP_SIZE - 9) * 3;
dst += (LIGHTMAP_SIZE - 9) * 4;
vec[1] += srf->drawinfo.lmapStep;
}
} else if (lumelsPerHeight == 2) {
vec[1] = srf->y0;
k = 0;
for (j = 0; j < 8; j++) {
vec[0] = srf->x0;
for (i = 0; i < 8; i++) {
z00 = (int)srf->heightmap[k];
vec[2] = srf->z0 + z00 + z00;
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
// increase lightmap step
vec[0] += srf->drawinfo.lmapStep;
k++;
z01 = (int)srf->heightmap[k];
vec[2] = srf->z0 + z00 + z01;
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
vec[0] += srf->drawinfo.lmapStep;
}
vec[2] = srf->z0 + z01 + z01;
added |= R_DlightSample(src, vec, dst);
src += (LIGHTMAP_SIZE - 16) * 3;
dst += (LIGHTMAP_SIZE - 16) * 4;
k -= 8;
vec[0] = srf->x0;
vec[1] += srf->drawinfo.lmapStep;
for (i = 0; i < 8; i++) {
z00 = (int)srf->heightmap[k] + (int)srf->heightmap[k + 9];
vec[2] = srf->z0 + z00;
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
k++;
vec[0] += srf->drawinfo.lmapStep;
z01 = (int)srf->heightmap[k] + (int)srf->heightmap[k + 9];
vec[2] = srf->z0 + (z00 + z01) * 0.5f;
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
vec[0] += srf->drawinfo.lmapStep;
}
vec[2] = srf->z0 + z01;
added |= R_DlightSample(src, vec, dst);
src += (LIGHTMAP_SIZE - 16) * 3;
dst += (LIGHTMAP_SIZE - 16) * 4;
k++;
vec[0] += srf->drawinfo.lmapStep;
vec[1] += srf->drawinfo.lmapStep;
}
vec[0] = srf->x0;
for (i = 0; i < 8; i++) {
z00 = (int)srf->heightmap[k];
vec[2] = srf->z0 + z00 + z00;
k++;
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
vec[0] += srf->drawinfo.lmapStep;
z01 = (int)srf->heightmap[k];
vec[2] = srf->z0 + z00 + z01;
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
vec[0] += srf->drawinfo.lmapStep;
}
vec[2] = srf->z0 + z01 + z01;
added |= R_DlightSample(src, vec, dst);
vec[0] += srf->drawinfo.lmapStep;
vec[1] += srf->drawinfo.lmapStep;
} else {
vec[1] = srf->y0;
for (j = 0; j < 8; j++) {
dj = 0;
for (;;) {
if (j == 7) {
if (dj >= lumelsPerHeight + 1) {
break;
}
} else if (dj >= lumelsPerHeight) {
break;
}
vec[0] = srf->x0;
for (i = 0; i < 8; i++) {
for (;;) {
if (i == 7) {
if (di >= lumelsPerHeight + 1) {
break;
}
} else if (dj >= lumelsPerHeight) {
break;
}
di = 0;
z00 = (int)srf->heightmap[9 * j + i];
z01 = (int)srf->heightmap[9 * (j + 1) + i];
z10 = (int)srf->heightmap[9 * j + (i + 1)];
z11 = (int)srf->heightmap[9 * (j + 1) + (i + 1)];
heightPerLumelSquared = 2.f / (lumelsPerHeight * lumelsPerHeight);
vec[2] =
srf->z0
+ (dj * (di * z11) + (lumelsPerHeight - dj) * (z10 * di) + z01 * (lumelsPerHeight - di) * dj
+ z00 * (lumelsPerHeight - di) * (lumelsPerHeight - dj))
* heightPerLumelSquared;
added |= R_DlightSample(src, vec, dst);
src += 3;
dst += 4;
vec[0] += srf->drawinfo.lmapStep;
}
}
src += (LIGHTMAP_SIZE - 1 - (8 * lumelsPerHeight)) * 3;
dst += (LIGHTMAP_SIZE - 1 - (8 * lumelsPerHeight)) * 4;
vec[1] += srf->drawinfo.lmapStep;
}
}
}
if (!added) {
srf->drawinfo.dlightMap[tr.smpFrame] = 0;
return 0;
}
for (i = 0; i < srf->drawinfo.lmapSize; i++) {
dli.allocated[x + i] = srf->drawinfo.lmapSize + y;
}
lmScale = (1.0 / LIGHTMAP_SIZE) / srf->drawinfo.lmapStep;
srf->drawinfo.lmapX -= (srf->x0 * lmScale - (0.5 / LIGHTMAP_SIZE));
srf->drawinfo.lmapY -= (srf->y0 * lmScale - (0.5 / LIGHTMAP_SIZE));
srf->drawinfo.dlightMap[tr.smpFrame] = dli.dlightMap + 1;
return srf->drawinfo.dlightMap[tr.smpFrame];
}
/*
===============
R_TransformDlights
Transforms the origins of an array of dlights.
Used by both the front end (for DlightBmodel) and
the back end (before doing the lighting calculation)
===============
*/
void R_TransformDlights(int count, dlight_t *dl, orientationr_t *ori)
{
int i;
vec3_t temp;
for (i = 0; i < count; i++, dl++) {
VectorSubtract(dl->origin, ori->origin, temp);
dl->transformed[0] = DotProduct(temp, ori->axis[0]);
dl->transformed[1] = DotProduct(temp, ori->axis[1]);
dl->transformed[2] = DotProduct(temp, ori->axis[2]);
}
}
/*
=============
R_DlightBmodel
Determine which dynamic lights may effect this bmodel
=============
*/
void R_DlightBmodel(bmodel_t *bmodel)
{
int i, j;
dlight_t *dl;
int mask;
msurface_t *surf;
// transform all the lights
R_TransformDlights(tr.refdef.num_dlights, tr.refdef.dlights, &tr.ori);
mask = 0;
for (i = 0; i < tr.refdef.num_dlights; i++) {
dl = &tr.refdef.dlights[i];
// see if the point is close enough to the bounds to matter
for (j = 0; j < 3; j++) {
if (dl->transformed[j] - bmodel->bounds[1][j] > dl->radius) {
break;
}
if (bmodel->bounds[0][j] - dl->transformed[j] > dl->radius) {
break;
}
}
if (j < 3) {
continue;
}
// we need to check this light
mask |= 1 << i;
}
tr.currentEntity->needDlights = (mask != 0);
// set the dlight bits in all the surfaces
for (i = 0; i < bmodel->numSurfaces; i++) {
surf = bmodel->firstSurface + i;
if (*surf->data == SF_FACE) {
((srfSurfaceFace_t *)surf->data)->dlightBits[tr.smpFrame] = mask;
} else if (*surf->data == SF_GRID) {
((srfGridMesh_t *)surf->data)->dlightBits[tr.smpFrame] = mask;
} else if (*surf->data == SF_TRIANGLES) {
((srfTriangles_t *)surf->data)->dlightBits[tr.smpFrame] = mask;
}
}
}
/*
===============
R_GetLightGridPalettedColor
===============
*/
static byte *R_GetLightGridPalettedColor(int iColor)
{
return &tr.world->lightGridPalette[iColor * 3];
}
/*
===============
R_GetLightingGridValue
===============
*/
void R_GetLightingGridValue(const vec3_t vPos, vec3_t vLight)
{
byte *pColor;
int iBaseOffset;
int i;
int iOffset;
int iRowPos;
int iData;
int iLen;
int iGridPos[3];
int iArrayXStep;
float fV;
float fFrac[3];
float fOMFrac[3];
float fWeight, fWeight2;
float fTotalFactor;
int iCurData;
vec3_t vLightOrigin;
byte *pCurData;
if (!tr.world || !tr.world->lightGridData || !tr.world->lightGridOffsets) {
vLight[0] = vLight[1] = vLight[2] = tr.identityLightByte;
return;
}
VectorSubtract(vPos, tr.world->lightGridMins, vLightOrigin);
for (i = 0; i < 3; i++) {
fV = vLightOrigin[i] * tr.world->lightGridOOSize[i];
iGridPos[i] = floor(fV);
fFrac[i] = fV - iGridPos[i];
fOMFrac[i] = 1.0 - fFrac[i];
if (iGridPos[i] < 0) {
iGridPos[i] = 0;
} else if (iGridPos[i] > tr.world->lightGridBounds[i] - 2) {
iGridPos[i] = tr.world->lightGridBounds[i] - 2;
}
}
fTotalFactor = 0;
iArrayXStep = tr.world->lightGridBounds[1];
iBaseOffset = tr.world->lightGridBounds[0] + iGridPos[1] + iArrayXStep * iGridPos[0];
VectorClear(vLight);
for (i = 0; i < 4; i++) {
qboolean bContinue = qfalse;
switch (i) {
case 0:
fWeight = fOMFrac[0] * fOMFrac[1] * fOMFrac[2];
fWeight2 = fOMFrac[0] * fOMFrac[1] * fFrac[2];
iOffset = tr.world->lightGridOffsets[iBaseOffset] + (tr.world->lightGridOffsets[iGridPos[0]] << 8);
break;
case 1:
fWeight = fOMFrac[0] * fFrac[1] * fOMFrac[2];
fWeight2 = fOMFrac[0] * fFrac[1] * fFrac[2];
iOffset = tr.world->lightGridOffsets[iBaseOffset + 1] + (tr.world->lightGridOffsets[iGridPos[0]] << 8);
break;
case 2:
fWeight = fFrac[0] * fOMFrac[1] * fOMFrac[2];
fWeight2 = fFrac[0] * fOMFrac[1] * fFrac[2];
iOffset = tr.world->lightGridOffsets[iBaseOffset + iArrayXStep]
+ (tr.world->lightGridOffsets[iGridPos[0] + 1] << 8);
break;
case 3:
fWeight = fFrac[0] * fFrac[1] * fOMFrac[2];
fWeight2 = fFrac[0] * fFrac[1] * fFrac[2];
iOffset = tr.world->lightGridOffsets[iBaseOffset + iArrayXStep + 1]
+ (tr.world->lightGridOffsets[iGridPos[0] + 1] << 8);
break;
}
iRowPos = iGridPos[2];
pCurData = &tr.world->lightGridData[iOffset];
iData = 0;
while (1) {
while (1) {
iCurData = (char)pCurData[iData];
iData++;
if (iCurData >= 0) {
break;
}
iLen = -iCurData;
if (iLen > iRowPos) {
iData += iRowPos;
if (pCurData[iData]) {
pColor = R_GetLightGridPalettedColor(pCurData[iData]);
VectorMA(vLight, fWeight, pColor, vLight);
fTotalFactor += fWeight;
}
iData++;
if (iLen - 1 == iRowPos) {
iData++;
}
if (pCurData[iData]) {
pColor = R_GetLightGridPalettedColor(pCurData[iData]);
VectorMA(vLight, fWeight2, pColor, vLight);
fTotalFactor += fWeight2;
}
bContinue = qtrue;
break;
}
iRowPos -= iLen;
iData += iLen;
}
if (bContinue) {
break;
}
iLen = iCurData + 2;
if (iLen - 1 >= iRowPos) {
break;
}
iRowPos -= iLen;
iData++;
}
if (bContinue) {
continue;
}
if (iLen - 1 > iRowPos) {
if (!pCurData[iData]) {
continue;
}
pColor = R_GetLightGridPalettedColor(pCurData[iData]);
VectorMA(vLight, fWeight + fWeight2, pColor, vLight);
fTotalFactor += fWeight + fWeight2;
} else {
if (pCurData[iData]) {
pColor = R_GetLightGridPalettedColor(pCurData[iData]);
VectorMA(vLight, fWeight, pColor, vLight);
fTotalFactor += fWeight;
}
iData += 2;
if (pCurData[iData]) {
pColor = R_GetLightGridPalettedColor(pCurData[iData]);
VectorMA(vLight, fWeight2, pColor, vLight);
fTotalFactor += fWeight2;
}
}
}
if (fTotalFactor > 0.0 && fTotalFactor < 0.99) {
VectorScale(vLight, 1.0 / fTotalFactor, vLight);
}
if (fTotalFactor) {
if (vLight[0] > 255.0 || vLight[1] > 255.0 || vLight[2] > 255.0) {
float t;
// normalize color values
t = 255.0 / Q_max(vLight[0], Q_max(vLight[1], vLight[2]));
VectorScale(vLight, t, vLight);
}
} else {
vLight[0] = vLight[1] = vLight[2] = tr.identityLightByte;
}
}
/*
===============
R_GetLightingGridValueFast
===============
*/
void R_GetLightingGridValueFast(const vec3_t vPos, vec3_t vLight)
{
byte *pColor;
int i;
int iRowPos;
int iGridPos[3];
int iArrayXStep;
float fV[3];
vec3_t vLightOrigin;
int iData;
int iLen;
int iBaseOffset;
byte *pCurData;
int iOrder;
int iToggle;
int iSample[8];
float fDist[3];
int j, k;
static int iSearch[8][8] = {
{0, 4, 2, 6, 1, 5, 3, 7},
{0, 2, 4, 6, 1, 3, 5, 7},
{0, 0, 0, 0, 0, 0, 0, 0},
{0, 2, 1, 3, 4, 6, 5, 7},
{0, 4, 1, 5, 2, 6, 3, 7},
{0, 0, 0, 0, 0, 0, 0, 0},
{0, 1, 4, 5, 2, 3, 6, 7},
{0, 1, 2, 3, 4, 5, 6, 7}
};
if (!tr.world->lightGridData || !tr.world->lightGridOffsets) {
vLight[0] = vLight[1] = vLight[2] = tr.identityLightByte;
return;
}
iOrder = 0;
iToggle = 0;
for (i = 0; i < 3; i++) {
fV[i] =
(tr.world->lightGridSize[i] * 0.5 + vPos[i] - tr.world->lightGridMins[i]) * tr.world->lightGridOOSize[i];
iGridPos[i] = floor(fV[i]);
fV[i] -= iGridPos[i];
if (iGridPos[i] < 0) {
iGridPos[i] = 0;
fV[i] = 0.0;
} else if (iGridPos[i] > tr.world->lightGridBounds[i] - 2) {
iGridPos[i] = tr.world->lightGridBounds[i] - 2;
fV[i] = 1.0;
}
fDist[i] = 0.5 - fV[i];
if (fDist[i] < 0) {
fDist[i] = -fDist[i];
iToggle |= 1 << i;
}
}
if (fDist[1] >= fDist[0]) {
iOrder = 1;
}
if (fDist[2] >= fDist[0]) {
iOrder |= 2;
}
if (fDist[2] >= fDist[1]) {
iOrder |= 4;
}
for (i = 0; i < 8; i++) {
iSample[i] = -1;
}
iArrayXStep = tr.world->lightGridBounds[1];
iBaseOffset = iGridPos[1] + tr.world->lightGridBounds[0] + iGridPos[0] * tr.world->lightGridBounds[1];
for (i = 0; i < 8; i++) {
j = iSearch[iOrder][i] ^ iToggle;
if (iSample[j] < 0) {
switch (j & 3) {
case 0:
pCurData =
&tr.world->lightGridData
[tr.world->lightGridOffsets[iGridPos[0]] * 256 + tr.world->lightGridOffsets[iBaseOffset]];
break;
case 1:
pCurData =
&tr.world->lightGridData
[tr.world->lightGridOffsets[iGridPos[0]] * 256 + tr.world->lightGridOffsets[iBaseOffset + 1]];
break;
case 2:
pCurData = &tr.world->lightGridData
[tr.world->lightGridOffsets[iGridPos[0] + 1] * 256
+ tr.world->lightGridOffsets[iBaseOffset + iArrayXStep]];
break;
case 3:
default:
pCurData = &tr.world->lightGridData
[tr.world->lightGridOffsets[iGridPos[0] + 1] * 256
+ tr.world->lightGridOffsets[iBaseOffset + iArrayXStep + 1]];
break;
}
k = j & ~1;
iRowPos = iGridPos[2];
iData = 0;
while (1) {
qboolean bShouldBreak = qfalse;
for (; (char)pCurData[iData] >= 0; iData += 2, iRowPos -= iLen) {
iLen = (char)pCurData[iData] + 2;
if (iLen - 1 < iRowPos) {
continue;
}
if (iLen - 1 > iRowPos) {
iSample[k + 1] = pCurData[iData + 1];
iSample[k] = pCurData[iData + 1];
} else {
iSample[k] = pCurData[iData + 1];
iSample[k + 1] = pCurData[iData + 3];
}
bShouldBreak = qtrue;
break;
}
if (bShouldBreak) {
break;
}
if (-(char)pCurData[iData] > iRowPos) {
iSample[k] = pCurData[iRowPos + iData + 1];
if ((-(char)pCurData[iData] - 1) == iRowPos) {
iSample[k + 1] = pCurData[iRowPos + iData + 3];
} else {
iSample[k + 1] = pCurData[iRowPos + iData + 2];
}
break;
}
iRowPos -= -(char)pCurData[iData];
iData += -(char)pCurData[iData] + 1;
}
}
if (iSample[j] > 0) {
pColor = R_GetLightGridPalettedColor(iSample[j]);
vLight[0] = pColor[0];
vLight[1] = pColor[1];
vLight[2] = pColor[2];
return;
}
}
vLight[0] = vLight[1] = vLight[2] = tr.identityLightByte;
}
/*
===============
R_GetLightingForDecal
===============
*/
void R_GetLightingForDecal(vec3_t vLight, const vec3_t vFacing, const vec3_t vOrigin)
{
float fMax;
R_GetLightingGridValue(vOrigin, vLight);
if (!tr.overbrightShift) {
return;
}
VectorScale(vLight, tr.overbrightMult, vLight);
if (vLight[0] > 255.0 || vLight[1] > 255.0 || vLight[2] > 255.0) {
float scale = 255.0 / Q_max(vLight[0], Q_max(vLight[1], vLight[2]));
VectorScale(vLight, scale, vLight);
}
}
/*
===============
R_GetLightingForSmoke
===============
*/
void R_GetLightingForSmoke(vec3_t vLight, const vec3_t vOrigin)
{
int i;
dlight_t *dl;
float power;
vec3_t dir;
float d;
if (r_smoothsmokelight->integer) {
R_GetLightingGridValue(vOrigin, vLight);
} else {
R_GetLightingGridValueFast(vOrigin, vLight);
}
for (i = 0; i < backEnd.refdef.num_dlights; i++) {
dl = &backEnd.refdef.dlights[i];
VectorSubtract(dl->origin, vOrigin, dir);
d = VectorLengthSquared(dir);
power = dl->radius * dl->radius;
if (power >= d) {
d = dl->radius * 7500.0 / d;
VectorMA(vLight, d, dl->color, vLight);
}
}
if (tr.overbrightShift) {
vLight[0] = tr.overbrightMult * vLight[0];
vLight[1] = tr.overbrightMult * vLight[1];
vLight[2] = tr.overbrightMult * vLight[2];
}
// normalize
if (vLight[0] > 255.0 || vLight[1] > 255.0 || vLight[2] > 255.0) {
float scale = 255.0 / Q_max(vLight[0], Q_max(vLight[1], vLight[2]));
VectorScale(vLight, scale, vLight);
}
vLight[0] /= 255.0;
vLight[1] /= 255.0;
vLight[2] /= 255.0;
}
/*
===============
RB_GetEntityGridLighting
===============
*/
static int RB_GetEntityGridLighting()
{
int iColor;
int i;
dlight_t *dl;
float power;
vec3_t vLight;
vec3_t dir;
float d;
float *lightOrigin;
lightOrigin = backEnd.currentSphere->traceOrigin;
if (!(backEnd.refdef.rdflags & RDF_NOWORLDMODEL) && tr.world->lightGridData) {
R_GetLightingGridValue(backEnd.currentSphere->traceOrigin, vLight);
} else {
vLight[0] = vLight[1] = vLight[2] = tr.identityLight * 150.0;
}
for (i = 0; i < backEnd.refdef.num_dlights; i++) {
dl = &backEnd.refdef.dlights[i];
VectorSubtract(dl->origin, lightOrigin, dir);
d = VectorLengthSquared(dir);
power = dl->radius * dl->radius;
if (power >= d) {
d = dl->radius * 7500.0 / d;
VectorMA(vLight, d, dl->color, vLight);
}
}
if (tr.overbrightShift) {
vLight[0] = tr.overbrightMult * vLight[0];
vLight[1] = tr.overbrightMult * vLight[1];
vLight[2] = tr.overbrightMult * vLight[2];
}
// normalize
if (vLight[0] > 255.0 || vLight[1] > 255.0 || vLight[2] > 255.0) {
float scale = 255.0 / Q_max(vLight[0], Q_max(vLight[1], vLight[2]));
VectorScale(vLight, scale, vLight);
}
// clamp ambient
for (i = 0; i < 3; i++) {
if (vLight[i] > tr.identityLightByte) {
vLight[i] = tr.identityLightByte;
}
}
// save out the byte packet version
((byte *)&iColor)[0] = myftol(vLight[0]);
((byte *)&iColor)[1] = myftol(vLight[1]);
((byte *)&iColor)[2] = myftol(vLight[2]);
((byte *)&iColor)[3] = 0xff;
return iColor;
#if 0
int i;
dlight_t* dl;
float power;
vec3_t dir;
float d;
vec3_t lightDir;
vec3_t lightOrigin;
int ambientlightInt = 0;
trRefEntity_t *ent = backEnd.currentEntity;
trRefdef_t *refdef = &backEnd.refdef;
//
// trace a sample point down to find ambient light
//
if (ent->e.renderfx & RF_LIGHTING_ORIGIN) {
// seperate lightOrigins are needed so an object that is
// sinking into the ground can still be lit, and so
// multi-part models can be lit identically
VectorCopy(ent->e.lightingOrigin, lightOrigin);
}
else {
VectorCopy(ent->e.origin, lightOrigin);
}
// if NOWORLDMODEL, only use dynamic lights (menu system, etc)
if (!(refdef->rdflags & RDF_NOWORLDMODEL)
&& tr.world->lightGridData) {
R_SetupEntityLightingGrid(ent);
}
else {
ent->ambientLight[0] = ent->ambientLight[1] =
ent->ambientLight[2] = tr.identityLight * 150;
ent->directedLight[0] = ent->directedLight[1] =
ent->directedLight[2] = tr.identityLight * 150;
VectorCopy(tr.sunDirection, ent->lightDir);
}
// bonus items and view weapons have a fixed minimum add
if (1 /* ent->e.renderfx & RF_MINLIGHT */) {
// give everything a minimum light add
ent->ambientLight[0] += tr.identityLight * 32;
ent->ambientLight[1] += tr.identityLight * 32;
ent->ambientLight[2] += tr.identityLight * 32;
}
//
// modify the light by dynamic lights
//
d = VectorLength(ent->directedLight);
VectorScale(ent->lightDir, d, lightDir);
for (i = 0; i < refdef->num_dlights; i++) {
dl = &refdef->dlights[i];
VectorSubtract(dl->origin, lightOrigin, dir);
d = VectorNormalize(dir);
power = DLIGHT_AT_RADIUS * (dl->radius * dl->radius);
if (d < DLIGHT_MINIMUM_RADIUS) {
d = DLIGHT_MINIMUM_RADIUS;
}
d = power / (d * d);
VectorMA(ent->directedLight, d, dl->color, ent->directedLight);
VectorMA(lightDir, d, dir, lightDir);
}
// clamp ambient
for (i = 0; i < 3; i++) {
if (ent->ambientLight[i] > tr.identityLightByte) {
ent->ambientLight[i] = tr.identityLightByte;
}
}
// save out the byte packet version
((byte*)&ambientlightInt)[0] = myftol(ent->ambientLight[0]);
((byte*)&ambientlightInt)[1] = myftol(ent->ambientLight[1]);
((byte*)&ambientlightInt)[2] = myftol(ent->ambientLight[2]);
((byte*)&ambientlightInt)[3] = 0xff;
// transform the direction to local space
VectorNormalize(lightDir);
ent->lightDir[0] = DotProduct(lightDir, ent->e.axis[0]);
ent->lightDir[1] = DotProduct(lightDir, ent->e.axis[1]);
ent->lightDir[2] = DotProduct(lightDir, ent->e.axis[2]);
return ambientlightInt;
#endif
}
/*
===============
RB_SetupEntityGridLighting
===============
*/
void RB_SetupEntityGridLighting()
{
trRefEntity_t *ent;
int iColor;
if (backEnd.currentEntity->bLightGridCalculated) {
return;
}
for (ent = backEnd.currentEntity; ent->e.parentEntity != ENTITYNUM_NONE;
ent = &backEnd.refdef.entities[ent->e.parentEntity]) {
trRefEntity_t *newref = &backEnd.refdef.entities[ent->e.parentEntity];
if (newref == ent) {
assert(!"backEnd.refdef.entities[ent->e.parentEntity] refers to itself\n");
iColor = newref->iGridLighting;
break;
}
if (newref->bLightGridCalculated) {
iColor = newref->iGridLighting;
break;
}
}
if (ent->e.parentEntity == ENTITYNUM_NONE) {
iColor = RB_GetEntityGridLighting();
}
ent = backEnd.currentEntity;
for (;;) {
ent->bLightGridCalculated = qtrue;
ent->iGridLighting = iColor;
if (ent->e.parentEntity == ENTITYNUM_NONE) {
break;
}
if (ent == &backEnd.refdef.entities[ent->e.parentEntity]) {
assert(!"backEnd.refdef.entities[ent->e.parentEntity] refers to itself\n");
break;
}
ent = &backEnd.refdef.entities[ent->e.parentEntity];
}
}
/*
===============
RB_SetupStaticModelGridLighting
===============
*/
void RB_SetupStaticModelGridLighting(trRefdef_t *refdef, cStaticModelUnpacked_t *ent, const vec3_t lightOrigin)
{
int iColor;
int i;
dlight_t *dl;
float power;
vec3_t vLight;
vec3_t dir;
float d;
if (ent->bLightGridCalculated) {
return;
}
ent->bLightGridCalculated = qtrue;
if (!(refdef->rdflags & RDF_NOWORLDMODEL) && tr.world->lightGridData) {
R_GetLightingGridValue(lightOrigin, vLight);
} else {
vLight[0] = vLight[1] = vLight[2] = tr.identityLight * 150.0;
}
for (i = 0; i < refdef->num_dlights; i++) {
dl = &refdef->dlights[i];
VectorSubtract(dl->origin, lightOrigin, dir);
d = VectorLengthSquared(dir);
power = dl->radius * dl->radius;
if (power >= d) {
d = dl->radius * 7500.0 / d;
VectorMA(vLight, d, dl->color, vLight);
}
}
if (tr.overbrightShift) {
vLight[0] = tr.overbrightMult * vLight[0];
vLight[1] = tr.overbrightMult * vLight[1];
vLight[2] = tr.overbrightMult * vLight[2];
}
// normalize
if (vLight[0] > 255.0 || vLight[1] > 255.0 || vLight[2] > 255.0) {
float scale = 255.0 / Q_max(vLight[0], Q_max(vLight[1], vLight[2]));
VectorScale(vLight, scale, vLight);
}
// clamp ambient
for (i = 0; i < 3; i++) {
if (vLight[i] > tr.identityLightByte) {
vLight[i] = tr.identityLightByte;
}
}
// save out the byte packet version
((byte *)&ent->iGridLighting)[0] = myftol(vLight[0]);
((byte *)&ent->iGridLighting)[1] = myftol(vLight[1]);
((byte *)&ent->iGridLighting)[2] = myftol(vLight[2]);
((byte *)&ent->iGridLighting)[3] = 0xff;
}
/*
=============================================================================
LIGHT SAMPLING
=============================================================================
*/
extern cvar_t *r_ambientScale;
extern cvar_t *r_directedScale;
/*
===============
LogLight
===============
*/
static void LogLight(trRefEntity_t *ent)
{
int max1, max2;
if (!(ent->e.renderfx & RF_FIRST_PERSON)) {
return;
}
max1 = ent->ambientLight[0];
if (ent->ambientLight[1] > max1) {
max1 = ent->ambientLight[1];
} else if (ent->ambientLight[2] > max1) {
max1 = ent->ambientLight[2];
}
max2 = ent->directedLight[0];
if (ent->directedLight[1] > max2) {
max2 = ent->directedLight[1];
} else if (ent->directedLight[2] > max2) {
max2 = ent->directedLight[2];
}
ri.Printf(PRINT_ALL, "amb:%i dir:%i\n", max1, max2);
}
/*
===============
R_ClearRealDlights
===============
*/
void R_ClearRealDlights()
{
memset(dli.allocated, 0, sizeof(dli.allocated));
dli.dlightMap = 0;
}
/*
===============
R_UploadDlights
===============
*/
void R_UploadDlights()
{
int i, h;
if (!tr.pc.c_dlightSurfaces) {
return;
}
h = 0;
for (i = 0; i < LIGHTMAP_SIZE; i++) {
if (h < dli.allocated[i]) {
h = dli.allocated[i];
}
}
if (h) {
if (h > LIGHTMAP_SIZE) {
ri.Error(ERR_DROP, "R_UploadDlights: bad allocated height");
}
GL_Bind(tr.dlightImages[dli.dlightMap]);
qglTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, LIGHTMAP_SIZE, h, GL_RGBA, GL_UNSIGNED_BYTE, dli.lightmap_buffer);
tr.pc.c_dlightMaps++;
memset(dli.allocated, 0, sizeof(dli.allocated));
}
}
/*
===============
R_AllocLMBlock
===============
*/
qboolean R_AllocLMBlock(int w, int h, int *x, int *y)
{
int i, j;
int best, best2;
for (;;) {
best = LIGHTMAP_SIZE;
for (i = 0; i < LIGHTMAP_SIZE - w; i++) {
best2 = 0;
for (j = 0; j < w && dli.allocated[i + j] < best; j++) {
if (best2 < dli.allocated[i + j]) {
best2 = dli.allocated[i + j];
}
}
if (j == w) {
*x = i;
*y = best2;
best = best2;
}
}
if (h + best <= LIGHTMAP_SIZE) {
break;
}
if (dli.dlightMap == 14) {
return qfalse;
}
R_UploadDlights();
dli.dlightMap++;
}
return qtrue;
}
/*
===============
R_DlightSample
===============
*/
qboolean R_DlightSample(byte *src, const vec3_t vec, byte *dst)
{
int r, g, b;
int k;
qboolean added;
vec3_t dir;
float add;
added = qfalse;
r = src[0];
g = src[1];
b = src[2];
for (k = 0; k < dli.numLights; k++) {
incidentLight_t *light = &dli.lights[k];
VectorSubtract(vec, light->origin, dir);
add = VectorLength(dir) * light->power;
if (add <= 1.f) {
float t = (1.0 - add) * (1.0 - add) * 375.0;
r = (int)(t * light->dl->color[0] + (float)r);
g = (int)(t * light->dl->color[1] + (float)g);
b = (int)(t * light->dl->color[2] + (float)b);
// light was added
added = qtrue;
}
}
if (tr.overbrightShift) {
r <<= tr.overbrightShift & 0xFF;
g <<= tr.overbrightShift & 0xFF;
b <<= tr.overbrightShift & 0xFF;
}
if (r > 0xFF || g > 0xFF || b > 0xFF) {
float t;
// normalize color values
t = 255.0 / (float)Q_max(r, Q_max(g, b));
r = (int)((float)r * t);
g = (int)((float)g * t);
b = (int)((float)b * t);
}
dst[0] = (byte)r;
dst[1] = (byte)g;
dst[2] = (byte)b;
dst[3] = -1;
return added;
}
int R_LightForPoint(vec3_t point, vec3_t ambientLight, vec3_t directedLight, vec3_t lightDir) {
// Stub
return 0;
}
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