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light_ydnar.c
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/* -------------------------------------------------------------------------------
Copyright (C) 1999-2006 Id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.
This file is part of GtkRadiant.
GtkRadiant 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.
GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
----------------------------------------------------------------------------------
This code has been altered significantly from its original form, to support
several games based on the Quake III Arena engine, in the form of "Q3Map2."
------------------------------------------------------------------------------- */
/* marker */
#define LIGHT_YDNAR_C
/* dependencies */
//#include "q3map2.h"
#include "kmap2.h" //add hypov8
/*
ColorToBytes()
ydnar: moved to here 2001-02-04
*/
void ColorToBytes(const float *color, byte * colorBytes, float scale)
{
int i;
float max, gamma;
vec3_t sample;
float inv, dif;
/* ydnar: scaling necessary for simulating r_overbrightBits on external lightmaps */
if(scale <= 0.0f)
scale = 1.0f;
/* make a local copy */
VectorScale(color, scale, sample);
/* muck with it */
gamma = 1.0f / lightmapGamma;
for(i = 0; i < 3; i++)
{
/* handle negative light */
if(sample[i] < 0.0f)
{
sample[i] = 0.0f;
continue;
}
/* gamma */
sample[i] = pow(sample[i] / 255.0f, gamma) * 255.0f;
}
if(lightmapExposure == 1)
{
/* clamp with color normalization */
max = sample[0];
if(sample[1] > max)
max = sample[1];
if(sample[2] > max)
max = sample[2];
if(max > 255.0f)
VectorScale(sample, (255.0f / max), sample);
}
else
{
if(lightmapExposure == 0)
{
lightmapExposure = 1.0f;
}
inv = 1.f / lightmapExposure;
//Exposure
max = sample[0];
if(sample[1] > max)
max = sample[1];
if(sample[2] > max)
max = sample[2];
dif = (1 - exp(-max * inv)) * 255;
if(max > 0)
{
dif = dif / max;
}
else
{
dif = 0;
}
for(i = 0; i < 3; i++)
{
sample[i] *= dif;
}
}
/* compensate for ingame overbrighting/bitshifting */
VectorScale(sample, (1.0f / lightmapCompensate), sample);
/* store it off */
colorBytes[0] = sample[0];
colorBytes[1] = sample[1];
colorBytes[2] = sample[2];
}
void ColorToFloats(const float *color, float * colorFloats, float scale)
{
int i;
float max, gamma;
vec3_t sample;
float inv, dif;
/* ydnar: scaling necessary for simulating r_overbrightBits on external lightmaps */
if(scale <= 0.0f)
scale = 1.0f;
/* make a local copy */
VectorScale(color, scale, sample);
/* muck with it */
gamma = 1.0f / lightmapGamma;
for(i = 0; i < 3; i++)
{
/* handle negative light */
if(sample[i] < 0.0f)
{
sample[i] = 0.0f;
continue;
}
/* gamma */
sample[i] = pow(sample[i] / 255.0f, gamma) * 255.0f;
}
if(lightmapExposure == 1)
{
/* clamp with color normalization */
max = sample[0];
if(sample[1] > max)
max = sample[1];
if(sample[2] > max)
max = sample[2];
if(max > 255.0f)
VectorScale(sample, (255.0f / max), sample);
}
else
{
if(lightmapExposure == 0)
{
lightmapExposure = 1.0f;
}
inv = 1.f / lightmapExposure;
//Exposure
max = sample[0];
if(sample[1] > max)
max = sample[1];
if(sample[2] > max)
max = sample[2];
dif = (1 - exp(-max * inv)) * 255;
if(max > 0)
{
dif = dif / max;
}
else
{
dif = 0;
}
for(i = 0; i < 3; i++)
{
sample[i] *= dif;
}
}
/* compensate for ingame overbrighting/bitshifting */
VectorScale(sample, (1.0f / lightmapCompensate), sample);
/* store it off */
colorFloats[0] = sample[0] * (1.0f / 255.0f);
colorFloats[1] = sample[1] * (1.0f / 255.0f);
colorFloats[2] = sample[2] * (1.0f / 255.0f);
}
/*
ColorModVert
hypov8: add color rgb/alpha mods after light for vertex has been calculated
*/
static void ColorModVert(bspDrawVert_t *verts, colorMod_t *cm, int lm)
{
//vertex may have colorModBrushes applied in -bsp. dont wipe alpha(terrain gen)
float alpha = verts->lightColor[lm][3];
if (cm == NULL)
return;
//convert to 0-255
verts->lightColor[lm][0] *= 255;
verts->lightColor[lm][1] *= 255;
verts->lightColor[lm][2] *= 255;
ColorMod(cm, 1, verts);
//converrt back to 0-1
verts->lightColor[lm][0] /= 255;
verts->lightColor[lm][1] /= 255;
verts->lightColor[lm][2] /= 255;
verts->lightColor[lm][3] = alpha;
}
/*
ColorToRGBE()
Tr3B: standard conversion from float pixels to rgbe pixels
*/
void ColorToRGBE(const float *color, unsigned char rgbe[4])
{
vec3_t sample;
float maxComponent;
int e;
VectorCopy(color, sample);
maxComponent = sample[0];
if(sample[1] > maxComponent)
maxComponent = sample[1];
if(sample[2] > maxComponent)
maxComponent = sample[2];
if(maxComponent < 1e-32)
{
rgbe[0] = 0;
rgbe[1] = 0;
rgbe[2] = 0;
rgbe[3] = 0;
}
else
{
#if 1
maxComponent = frexp(maxComponent, &e) * 255.0 / maxComponent;
rgbe[0] = (unsigned char) (sample[0] * maxComponent);
rgbe[1] = (unsigned char) (sample[1] * maxComponent);
rgbe[2] = (unsigned char) (sample[2] * maxComponent);
rgbe[3] = (unsigned char) (e + 128);
#else
e = ceil(log2(maxComponent));
VectorScale(sample, 1.0 / exp2(e), sample);
rgbe[0] = (unsigned char) (sample[0] * 255);
rgbe[1] = (unsigned char) (sample[1] * 255);
rgbe[2] = (unsigned char) (sample[2] * 255);
rgbe[3] = (unsigned char) (e + 128);
#endif
}
}
/* -------------------------------------------------------------------------------
this section deals with phong shading (normal interpolation across brush faces)
------------------------------------------------------------------------------- */
/*
SmoothNormals()
smooths together coincident vertex normals across the bsp
*/
#define MAX_SAMPLES 256
#define THETA_EPSILON 0.000001
#define EQUAL_NORMAL_EPSILON 0.01
void SmoothNormals(void)
{
int i, j, k, f, cs, numVerts, numVotes, fOld, start;
float shadeAngle, defaultShadeAngle, maxShadeAngle, dot, testAngle;
bspDrawSurface_t *ds;
shaderInfo_t *si;
float *shadeAngles;
byte *smoothed;
vec3_t average, diff;
int indexes[MAX_SAMPLES];
vec3_t votes[MAX_SAMPLES];
/* allocate shade angle table */
shadeAngles = safe_malloc(numBSPDrawVerts * sizeof(float));
memset(shadeAngles, 0, numBSPDrawVerts * sizeof(float));
/* allocate smoothed table */
cs = (numBSPDrawVerts / 8) + 1;
smoothed = safe_malloc(cs);
memset(smoothed, 0, cs);
/* set default shade angle */
defaultShadeAngle = DEG2RAD(shadeAngleDegrees);
maxShadeAngle = 0;
/* run through every surface and flag verts belonging to non-lightmapped surfaces
and set per-vertex smoothing angle */
for(i = 0; i < numBSPDrawSurfaces; i++)
{
/* get drawsurf */
ds = &bspDrawSurfaces[i];
/* get shader for shade angle */
si = surfaceInfos[i].si;
if(si->shadeAngleDegrees)
shadeAngle = DEG2RAD(si->shadeAngleDegrees);
else
shadeAngle = defaultShadeAngle;
if(shadeAngle > maxShadeAngle)
maxShadeAngle = shadeAngle;
/* flag its verts */
for(j = 0; j < ds->numVerts; j++)
{
f = ds->firstVert + j;
shadeAngles[f] = shadeAngle;
if(ds->surfaceType == MST_TRIANGLE_SOUP)
smoothed[f >> 3] |= (1 << (f & 7));
}
/* ydnar: optional force-to-trisoup */
if(trisoup && ds->surfaceType == MST_PLANAR)
{
ds->surfaceType = MST_TRIANGLE_SOUP;
ds->lightmapNum[0] = -3;
}
}
/* bail if no surfaces have a shade angle */
if(maxShadeAngle == 0)
{
free(shadeAngles);
free(smoothed);
return;
}
/* init pacifier */
fOld = -1;
start = I_FloatTime();
/* go through the list of vertexes */
for(i = 0; i < numBSPDrawVerts; i++)
{
/* print pacifier */
f = 10 * i / numBSPDrawVerts;
if(f != fOld)
{
fOld = f;
Sys_Printf("%i...", f);
}
/* already smoothed? */
if(smoothed[i >> 3] & (1 << (i & 7)))
continue;
/* clear */
VectorClear(average);
numVerts = 0;
numVotes = 0;
/* build a table of coincident vertexes */
for(j = i; j < numBSPDrawVerts && numVerts < MAX_SAMPLES; j++)
{
/* already smoothed? */
if(smoothed[j >> 3] & (1 << (j & 7)))
continue;
/* test vertexes */
if(VectorCompare(yDrawVerts[i].xyz, yDrawVerts[j].xyz) == qfalse)
continue;
/* use smallest shade angle */
shadeAngle = (shadeAngles[i] < shadeAngles[j] ? shadeAngles[i] : shadeAngles[j]);
/* check shade angle */
dot = DotProduct(bspDrawVerts[i].normal, bspDrawVerts[j].normal);
if(dot > 1.0)
dot = 1.0;
else if(dot < -1.0)
dot = -1.0;
testAngle = acos(dot) + THETA_EPSILON;
if(testAngle >= shadeAngle)
{
//Sys_Printf( "F(%3.3f >= %3.3f) ", RAD2DEG( testAngle ), RAD2DEG( shadeAngle ) );
continue;
}
//Sys_Printf( "P(%3.3f < %3.3f) ", RAD2DEG( testAngle ), RAD2DEG( shadeAngle ) );
/* add to the list */
indexes[numVerts++] = j;
/* flag vertex */
smoothed[j >> 3] |= (1 << (j & 7));
/* see if this normal has already been voted */
for(k = 0; k < numVotes; k++)
{
VectorSubtract(bspDrawVerts[j].normal, votes[k], diff);
if(fabs(diff[0]) < EQUAL_NORMAL_EPSILON &&
fabs(diff[1]) < EQUAL_NORMAL_EPSILON && fabs(diff[2]) < EQUAL_NORMAL_EPSILON)
break;
}
/* add a new vote? */
if(k == numVotes && numVotes < MAX_SAMPLES)
{
VectorAdd(average, bspDrawVerts[j].normal, average);
VectorCopy(bspDrawVerts[j].normal, votes[numVotes]);
numVotes++;
}
}
/* don't average for less than 2 verts */
if(numVerts < 2)
continue;
/* average normal */
if(VectorNormalize(average) > 0)
{
/* smooth */
for(j = 0; j < numVerts; j++)
VectorCopy(average, yDrawVerts[indexes[j]].normal);
}
}
/* free the tables */
free(shadeAngles);
free(smoothed);
/* print time */
Sys_Printf(" (%i)\n", (int)(I_FloatTime() - start));
}
/* -------------------------------------------------------------------------------
this section deals with phong shaded lightmap tracing
------------------------------------------------------------------------------- */
/* 9th rewrite (recursive subdivision of a lightmap triangle) */
/*
CalcTangentVectors()
calculates the st tangent vectors for normalmapping
*/
static qboolean CalcTangentVectors(int numVerts, bspDrawVert_t ** dv, vec3_t * stv, vec3_t * ttv)
{
int i;
float bb, s, t;
vec3_t bary;
/* calculate barycentric basis for the triangle */
bb = (dv[1]->st[0] - dv[0]->st[0]) * (dv[2]->st[1] - dv[0]->st[1]) - (dv[2]->st[0] - dv[0]->st[0]) * (dv[1]->st[1] -
dv[0]->st[1]);
if(fabs(bb) < 0.00000001f)
return qfalse;
/* do each vertex */
for(i = 0; i < numVerts; i++)
{
/* calculate s tangent vector */
s = dv[i]->st[0] + 10.0f;
t = dv[i]->st[1];
bary[0] = ((dv[1]->st[0] - s) * (dv[2]->st[1] - t) - (dv[2]->st[0] - s) * (dv[1]->st[1] - t)) / bb;
bary[1] = ((dv[2]->st[0] - s) * (dv[0]->st[1] - t) - (dv[0]->st[0] - s) * (dv[2]->st[1] - t)) / bb;
bary[2] = ((dv[0]->st[0] - s) * (dv[1]->st[1] - t) - (dv[1]->st[0] - s) * (dv[0]->st[1] - t)) / bb;
stv[i][0] = bary[0] * dv[0]->xyz[0] + bary[1] * dv[1]->xyz[0] + bary[2] * dv[2]->xyz[0];
stv[i][1] = bary[0] * dv[0]->xyz[1] + bary[1] * dv[1]->xyz[1] + bary[2] * dv[2]->xyz[1];
stv[i][2] = bary[0] * dv[0]->xyz[2] + bary[1] * dv[1]->xyz[2] + bary[2] * dv[2]->xyz[2];
VectorSubtract(stv[i], dv[i]->xyz, stv[i]);
VectorNormalize(stv[i]);
/* calculate t tangent vector */
s = dv[i]->st[0];
t = dv[i]->st[1] + 10.0f;
bary[0] = ((dv[1]->st[0] - s) * (dv[2]->st[1] - t) - (dv[2]->st[0] - s) * (dv[1]->st[1] - t)) / bb;
bary[1] = ((dv[2]->st[0] - s) * (dv[0]->st[1] - t) - (dv[0]->st[0] - s) * (dv[2]->st[1] - t)) / bb;
bary[2] = ((dv[0]->st[0] - s) * (dv[1]->st[1] - t) - (dv[1]->st[0] - s) * (dv[0]->st[1] - t)) / bb;
ttv[i][0] = bary[0] * dv[0]->xyz[0] + bary[1] * dv[1]->xyz[0] + bary[2] * dv[2]->xyz[0];
ttv[i][1] = bary[0] * dv[0]->xyz[1] + bary[1] * dv[1]->xyz[1] + bary[2] * dv[2]->xyz[1];
ttv[i][2] = bary[0] * dv[0]->xyz[2] + bary[1] * dv[1]->xyz[2] + bary[2] * dv[2]->xyz[2];
VectorSubtract(ttv[i], dv[i]->xyz, ttv[i]);
VectorNormalize(ttv[i]);
/* debug code */
//% Sys_FPrintf( SYS_VRB, "%d S: (%f %f %f) T: (%f %f %f)\n", i,
//% stv[ i ][ 0 ], stv[ i ][ 1 ], stv[ i ][ 2 ], ttv[ i ][ 0 ], ttv[ i ][ 1 ], ttv[ i ][ 2 ] );
}
/* return to caller */
return qtrue;
}
/*
PerturbNormal()
perterbs the normal by the shader's normalmap in tangent space
*/
static void PerturbNormal(bspDrawVert_t * dv, shaderInfo_t * si, vec3_t pNormal, vec3_t stv[3], vec3_t ttv[3])
{
int i;
vec4_t bump;
/* passthrough */
VectorCopy(dv->normal, pNormal);
/* sample normalmap */
if(RadSampleImage(si->normalImage->pixels, si->normalImage->width, si->normalImage->height, dv->st, bump) == qfalse)
return;
/* remap sampled normal from [0,255] to [-1,-1] */
for(i = 0; i < 3; i++)
bump[i] = (bump[i] - 127.0f) * (1.0f / 127.5f);
/* scale tangent vectors and add to original normal */
VectorMA(dv->normal, bump[0], stv[0], pNormal);
VectorMA(pNormal, bump[1], ttv[0], pNormal);
VectorMA(pNormal, bump[2], dv->normal, pNormal);
/* renormalize and return */
VectorNormalize(pNormal);
}
/*
MapSingleLuxel()
maps a luxel for triangle bv at
*/
#define NUDGE 0.5f
#define BOGUS_NUDGE -99999.0f
static int MapSingleLuxel(rawLightmap_t * lm, surfaceInfo_t * info, bspDrawVert_t * dv, vec4_t plane, float pass, vec3_t stv[3],
vec3_t ttv[3], vec3_t worldverts[3])
{
int i, x, y, numClusters, *clusters, pointCluster, *cluster;
float *luxel, *origin, *normal, d, lightmapSampleOffset;
shaderInfo_t *si;
vec3_t pNormal;
vec3_t vecs[3];
vec3_t nudged;
vec3_t cverts[3];
vec3_t temp;
vec4_t sideplane, hostplane;
vec3_t origintwo;
int j, next;
float e;
float *nudge;
static float nudges[][2] = {
//%{ 0, 0 }, /* try center first */
{-NUDGE, 0}, /* left */
{NUDGE, 0}, /* right */
{0, NUDGE}, /* up */
{0, -NUDGE}, /* down */
{-NUDGE, NUDGE}, /* left/up */
{NUDGE, -NUDGE}, /* right/down */
{NUDGE, NUDGE}, /* right/up */
{-NUDGE, -NUDGE}, /* left/down */
{BOGUS_NUDGE, BOGUS_NUDGE}
};
/* find luxel xy coords (fixme: subtract 0.5?) */
x = dv->lightmap[0][0];
y = dv->lightmap[0][1];
if(x < 0)
x = 0;
else if(x >= lm->sw)
x = lm->sw - 1;
if(y < 0)
y = 0;
else if(y >= lm->sh)
y = lm->sh - 1;
/* set shader and cluster list */
if(info != NULL)
{
si = info->si;
numClusters = info->numSurfaceClusters;
clusters = &surfaceClusters[info->firstSurfaceCluster];
}
else
{
si = NULL;
numClusters = 0;
clusters = NULL;
}
/* get luxel, origin, cluster, and normal */
luxel = SUPER_LUXEL(0, x, y);
origin = SUPER_ORIGIN(x, y);
normal = SUPER_NORMAL(x, y);
cluster = SUPER_CLUSTER(x, y);
/* don't attempt to remap occluded luxels for planar surfaces */
if((*cluster) == CLUSTER_OCCLUDED && lm->plane != NULL)
return (*cluster);
/* only average the normal for premapped luxels */
else if((*cluster) >= 0)
{
/* do bumpmap calculations */
if(stv != NULL)
PerturbNormal(dv, si, pNormal, stv, ttv);
else
VectorCopy(dv->normal, pNormal);
/* add the additional normal data */
VectorAdd(normal, pNormal, normal);
luxel[3] += 1.0f;
return (*cluster);
}
/* otherwise, unmapped luxels (*cluster == CLUSTER_UNMAPPED) will have their full attributes calculated */
/* get origin */
/* axial lightmap projection */
if(lm->vecs != NULL)
{
/* calculate an origin for the sample from the lightmap vectors */
VectorCopy(lm->origin, origin);
for(i = 0; i < 3; i++)
{
/* add unless it's the axis, which is taken care of later */
if(i == lm->axisNum)
continue;
origin[i] += (x * lm->vecs[0][i]) + (y * lm->vecs[1][i]);
}
/* project the origin onto the plane */
d = DotProduct(origin, plane) - plane[3];
d /= plane[lm->axisNum];
origin[lm->axisNum] -= d;
}
/* non axial lightmap projection (explicit xyz) */
else
VectorCopy(dv->xyz, origin);
//////////////////////
//27's test to make sure samples stay within the triangle boundaries
//1) Test the sample origin to see if it lays on the wrong side of any edge (x/y)
//2) if it does, nudge it onto the correct side.
if(worldverts != NULL && lightmapTriangleCheck)
{
for(j = 0; j < 3; j++)
{
VectorCopy(worldverts[j], cverts[j]);
}
PlaneFromPoints(hostplane, cverts[0], cverts[1], cverts[2], qtrue);
for(j = 0; j < 3; j++)
{
for(i = 0; i < 3; i++)
{
//build plane using 2 edges and a normal
next = (i + 1) % 3;
VectorCopy(cverts[next], temp);
VectorAdd(temp, hostplane, temp);
PlaneFromPoints(sideplane, cverts[i], cverts[next], temp, qtrue);
//planetest sample point
e = DotProduct(origin, sideplane);
e = e - sideplane[3];
if(e > 0)
{
//we're bad.
//VectorClear(origin);
//Move the sample point back inside triangle bounds
origin[0] -= sideplane[0] * (e + 1);
origin[1] -= sideplane[1] * (e + 1);
origin[2] -= sideplane[2] * (e + 1);
#ifdef DEBUG_27_1
VectorClear(origin);
#endif
}
}
}
}
////////////////////////
/* planar surfaces have precalculated lightmap vectors for nudging */
if(lm->plane != NULL)
{
VectorCopy(lm->vecs[0], vecs[0]);
VectorCopy(lm->vecs[1], vecs[1]);
VectorCopy(lm->plane, vecs[2]);
}
/* non-planar surfaces must calculate them */
else
{
if(plane != NULL)
VectorCopy(plane, vecs[2]);
else
VectorCopy(dv->normal, vecs[2]);
MakeNormalVectors(vecs[2], vecs[0], vecs[1]);
}
/* push the origin off the surface a bit */
if(si != NULL)
lightmapSampleOffset = si->lightmapSampleOffset;
else
lightmapSampleOffset = DEFAULT_LIGHTMAP_SAMPLE_OFFSET;
if(lm->axisNum < 0)
VectorMA(origin, lightmapSampleOffset, vecs[2], origin);
else if(vecs[2][lm->axisNum] < 0.0f)
origin[lm->axisNum] -= lightmapSampleOffset;
else
origin[lm->axisNum] += lightmapSampleOffset;
VectorCopy(origin, origintwo);
if(lightmapExtraVisClusterNudge)
{
origintwo[0] += vecs[2][0];
origintwo[1] += vecs[2][1];
origintwo[2] += vecs[2][2];
}
/* get cluster */
pointCluster = ClusterForPointExtFilter(origintwo, LUXEL_EPSILON, numClusters, clusters);
/* another retarded hack, storing nudge count in luxel[ 1 ] */
luxel[1] = 0.0f;
/* point in solid? (except in dark mode) */
if(pointCluster < 0 && dark == qfalse)
{
/* nudge the the location around */
nudge = nudges[0];
while(nudge[0] > BOGUS_NUDGE && pointCluster < 0)
{
/* nudge the vector around a bit */
for(i = 0; i < 3; i++)
{
/* set nudged point */
nudged[i] = origintwo[i] + (nudge[0] * vecs[0][i]) + (nudge[1] * vecs[1][i]);
}
nudge += 2;
/* get pvs cluster */
pointCluster = ClusterForPointExtFilter(nudged, LUXEL_EPSILON, numClusters, clusters); //% + 0.625 );
if(pointCluster >= 0)
VectorCopy(nudged, origin);
luxel[1] += 1.0f;
}
}
/* as a last resort, if still in solid, try drawvert origin offset by normal (except in dark mode) */
if(pointCluster < 0 && si != NULL && dark == qfalse)
{
VectorMA(dv->xyz, lightmapSampleOffset, dv->normal, nudged);
pointCluster = ClusterForPointExtFilter(nudged, LUXEL_EPSILON, numClusters, clusters);
if(pointCluster >= 0)
VectorCopy(nudged, origin);
luxel[1] += 1.0f;
}
/* valid? */
if(pointCluster < 0)
{
(*cluster) = CLUSTER_OCCLUDED;
VectorClear(origin);
VectorClear(normal);
numLuxelsOccluded++;
return (*cluster);
}
/* debug code */
//% Sys_Printf( "%f %f %f\n", origin[ 0 ], origin[ 1 ], origin[ 2 ] );
/* do bumpmap calculations */
if(stv)
PerturbNormal(dv, si, pNormal, stv, ttv);
else
VectorCopy(dv->normal, pNormal);
/* store the cluster and normal */
(*cluster) = pointCluster;
VectorCopy(pNormal, normal);
/* store explicit mapping pass and implicit mapping pass */
luxel[0] = pass;
luxel[3] = 1.0f;
/* add to count */
numLuxelsMapped++;
/* return ok */
return (*cluster);
}
/*
MapTriangle_r()
recursively subdivides a triangle until its edges are shorter
than the distance between two luxels (thanks jc :)
*/
static void MapTriangle_r(rawLightmap_t * lm, surfaceInfo_t * info, bspDrawVert_t * dv[3], vec4_t plane, vec3_t stv[3],
vec3_t ttv[3], vec3_t worldverts[3])
{
bspDrawVert_t mid, *dv2[3];
int max;
/* map the vertexes */
#if 0
MapSingleLuxel(lm, info, dv[0], plane, 1, stv, ttv);
MapSingleLuxel(lm, info, dv[1], plane, 1, stv, ttv);
MapSingleLuxel(lm, info, dv[2], plane, 1, stv, ttv);
#endif
/* subdivide calc */
{
int i;
float *a, *b, dx, dy, dist, maxDist;
/* find the longest edge and split it */
max = -1;
maxDist = 0;
for(i = 0; i < 3; i++)
{
/* get verts */
a = dv[i]->lightmap[0];
b = dv[(i + 1) % 3]->lightmap[0];
/* get dists */
dx = a[0] - b[0];
dy = a[1] - b[1];
dist = (dx * dx) + (dy * dy); //% sqrt( (dx * dx) + (dy * dy) );
/* longer? */
if(dist > maxDist)
{
maxDist = dist;
max = i;
}
}
/* try to early out */
if(max < 0 || maxDist <= subdivideThreshold) /* ydnar: was i < 0 instead of max < 0 (?) */
return;
}
/* split the longest edge and map it */
LerpDrawVert(dv[max], dv[(max + 1) % 3], &mid);
MapSingleLuxel(lm, info, &mid, plane, 1, stv, ttv, worldverts);
/* push the point up a little bit to account for fp creep (fixme: revisit this) */
//% VectorMA( mid.xyz, 2.0f, mid.normal, mid.xyz );
/* recurse to first triangle */
VectorCopy(dv, dv2);
dv2[max] = ∣
MapTriangle_r(lm, info, dv2, plane, stv, ttv, worldverts);
/* recurse to second triangle */
VectorCopy(dv, dv2);
dv2[(max + 1) % 3] = ∣
MapTriangle_r(lm, info, dv2, plane, stv, ttv, worldverts);
}
/*
MapTriangle()
seed function for MapTriangle_r()
requires a cw ordered triangle
*/
static qboolean MapTriangle(rawLightmap_t * lm, surfaceInfo_t * info, bspDrawVert_t * dv[3], qboolean mapNonAxial)
{
int i;
vec4_t plane;
vec3_t *stv, *ttv, stvStatic[3], ttvStatic[3];
vec3_t worldverts[3];
/* get plane if possible */
if(lm->plane != NULL)
{
VectorCopy(lm->plane, plane);
plane[3] = lm->plane[3];
}
/* otherwise make one from the points */
else if(PlaneFromPoints(plane, dv[0]->xyz, dv[1]->xyz, dv[2]->xyz, qtrue) == qfalse)
return qfalse;
/* check to see if we need to calculate texture->world tangent vectors */
if(info->si->normalImage != NULL && CalcTangentVectors(3, dv, stvStatic, ttvStatic))
{
stv = stvStatic;
ttv = ttvStatic;
}
else
{
stv = NULL;
ttv = NULL;
}
VectorCopy(dv[0]->xyz, worldverts[0]);
VectorCopy(dv[1]->xyz, worldverts[1]);
VectorCopy(dv[2]->xyz, worldverts[2]);
/* map the vertexes */
MapSingleLuxel(lm, info, dv[0], plane, 1, stv, ttv, worldverts);
MapSingleLuxel(lm, info, dv[1], plane, 1, stv, ttv, worldverts);
MapSingleLuxel(lm, info, dv[2], plane, 1, stv, ttv, worldverts);
/* 2002-11-20: prefer axial triangle edges */
if(mapNonAxial)
{
/* subdivide the triangle */
MapTriangle_r(lm, info, dv, plane, stv, ttv, worldverts);
return qtrue;
}
for(i = 0; i < 3; i++)
{
float *a, *b;
bspDrawVert_t *dv2[3];
/* get verts */
a = dv[i]->lightmap[0];
b = dv[(i + 1) % 3]->lightmap[0];
/* make degenerate triangles for mapping edges */
if(fabs(a[0] - b[0]) < 0.01f || fabs(a[1] - b[1]) < 0.01f)
{
dv2[0] = dv[i];
dv2[1] = dv[(i + 1) % 3];
dv2[2] = dv[(i + 1) % 3];
/* map the degenerate triangle */
MapTriangle_r(lm, info, dv2, plane, stv, ttv, worldverts);
}
}
return qtrue;
}
/*
MapQuad_r()
recursively subdivides a quad until its edges are shorter
than the distance between two luxels
*/
static void MapQuad_r(rawLightmap_t * lm, surfaceInfo_t * info, bspDrawVert_t * dv[4], vec4_t plane, vec3_t stv[4], vec3_t ttv[4])
{
bspDrawVert_t mid[2], *dv2[4];
int max;
/* subdivide calc */
{
int i;
float *a, *b, dx, dy, dist, maxDist;
/* find the longest edge and split it */
max = -1;
maxDist = 0;
for(i = 0; i < 4; i++)
{
/* get verts */
a = dv[i]->lightmap[0];