light_bounce.c

/* -------------------------------------------------------------------------------

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_BOUNCE_C



/* dependencies */
#include "kmap2.h"



/* functions */

/*
RadFreeLights()
deletes any existing lights, freeing up memory for the next bounce
*/

void RadFreeLights(void)
{
	light_t        *light, *next;


	/* delete lights */
	for(light = lights; light; light = next)
	{
		next = light->next;
		if(light->w != NULL)
			FreeWinding(light->w);
		free(light);
	}
	numLights = 0;
	lights = NULL;
}



/*
RadClipWindingEpsilon()
clips a rad winding by a plane
based off the regular clip winding code
*/

static void RadClipWindingEpsilon(radWinding_t * in, vec3_t normal, vec_t dist,
								  vec_t epsilon, radWinding_t * front, radWinding_t * back, clipWork_t * cw)
{
	vec_t          *dists;
	int            *sides;
	int             counts[3];
	vec_t           dot;		/* ydnar: changed from static b/c of threading *//* VC 4.2 optimizer bug if not static? */
	int             i, j, k;
	radVert_t      *v1, *v2, mid;
	int             maxPoints;


	/* crutch */
	dists = cw->dists;
	sides = cw->sides;

	/* clear counts */
	counts[0] = counts[1] = counts[2] = 0;

	/* determine sides for each point */
	for(i = 0; i < in->numVerts; i++)
	{
		dot = DotProduct(in->verts[i].xyz, normal);
		dot -= dist;
		dists[i] = dot;
		if(dot > epsilon)
			sides[i] = SIDE_FRONT;
		else if(dot < -epsilon)
			sides[i] = SIDE_BACK;
		else
			sides[i] = SIDE_ON;
		counts[sides[i]]++;
	}
	sides[i] = sides[0];
	dists[i] = dists[0];

	/* clear front and back */
	front->numVerts = back->numVerts = 0;

	/* handle all on one side cases */
	if(counts[0] == 0)
	{
		memcpy(back, in, sizeof(radWinding_t));
		return;
	}
	if(counts[1] == 0)
	{
		memcpy(front, in, sizeof(radWinding_t));
		return;
	}

	/* setup windings */
	maxPoints = in->numVerts + 4;

	/* do individual verts */
	for(i = 0; i < in->numVerts; i++)
	{
		/* do simple vertex copies first */
		v1 = &in->verts[i];

		if(sides[i] == SIDE_ON)
		{
			memcpy(&front->verts[front->numVerts++], v1, sizeof(radVert_t));
			memcpy(&back->verts[back->numVerts++], v1, sizeof(radVert_t));
			continue;
		}

		if(sides[i] == SIDE_FRONT)
			memcpy(&front->verts[front->numVerts++], v1, sizeof(radVert_t));

		if(sides[i] == SIDE_BACK)
			memcpy(&back->verts[back->numVerts++], v1, sizeof(radVert_t));

		if(sides[i + 1] == SIDE_ON || sides[i + 1] == sides[i])
			continue;

		/* generate a split vertex */
		v2 = &in->verts[(i + 1) % in->numVerts];

		dot = dists[i] / (dists[i] - dists[i + 1]);

		/* average vertex values */
		for(j = 0; j < 4; j++)
		{
			/* color */
			if(j < 4)
			{
				for(k = 0; k < MAX_LIGHTMAPS; k++)
					mid.color[k][j] = v1->color[k][j] + dot * (v2->color[k][j] - v1->color[k][j]);
			}

			/* xyz, normal */
			if(j < 3)
			{
				mid.xyz[j] = v1->xyz[j] + dot * (v2->xyz[j] - v1->xyz[j]);
				mid.normal[j] = v1->normal[j] + dot * (v2->normal[j] - v1->normal[j]);
			}

			/* st, lightmap */
			if(j < 2)
			{
				mid.st[j] = v1->st[j] + dot * (v2->st[j] - v1->st[j]);
				for(k = 0; k < MAX_LIGHTMAPS; k++)
					mid.lightmap[k][j] = v1->lightmap[k][j] + dot * (v2->lightmap[k][j] - v1->lightmap[k][j]);
			}
		}

		/* normalize the averaged normal */
		VectorNormalize(mid.normal);

		/* copy the midpoint to both windings */
		memcpy(&front->verts[front->numVerts++], &mid, sizeof(radVert_t));
		memcpy(&back->verts[back->numVerts++], &mid, sizeof(radVert_t));
	}

	/* error check */
	if(front->numVerts > maxPoints || front->numVerts > maxPoints)
		Error("RadClipWindingEpsilon: points exceeded estimate");
	if(front->numVerts > MAX_POINTS_ON_WINDING || front->numVerts > MAX_POINTS_ON_WINDING)
		Error("RadClipWindingEpsilon: MAX_POINTS_ON_WINDING");
}





/*
RadSampleImage()
samples a texture image for a given color
returns qfalse if pixels are bad
*/

qboolean RadSampleImage(byte * pixels, int width, int height, float st[2], float color[4])
{
	float           sto[2];
	int             x, y;


	/* clear color first */
	color[0] = color[1] = color[2] = color[3] = 255;

	/* dummy check */
	if(pixels == NULL || width < 1 || height < 1)
		return qfalse;

	/* bias st */
	sto[0] = st[0];
	while(sto[0] < 0.0f)
		sto[0] += 1.0f;
	sto[1] = st[1];
	while(sto[1] < 0.0f)
		sto[1] += 1.0f;

	/* get offsets */
	x = ((float)width * sto[0]) + 0.5f;
	x %= width;
	y = ((float)height * sto[1]) + 0.5f;
	y %= height;

	/* get pixel */
	pixels += (y * width * 4) + (x * 4);
	VectorCopy(pixels, color);
	color[3] = pixels[3];
	return qtrue;
}



/*
RadSample()
samples a fragment's lightmap or vertex color and returns an
average color and a color gradient for the sample
*/

#define MAX_SAMPLES			150
#define SAMPLE_GRANULARITY	6

static void RadSample(int lightmapNum, bspDrawSurface_t * ds, rawLightmap_t * lm, shaderInfo_t * si, radWinding_t * rw,
					  vec3_t average, vec3_t gradient, int *style)
{
	int             i, j, k, l, v, x, y, samples;
	vec3_t          color, mins, maxs;
	vec4_t          textureColor;
	float           alpha, alphaI, bf;
	vec3_t          blend;
	float           st[2], lightmap[2], *radLuxel;
	radVert_t      *rv[3];


	/* initial setup */
	ClearBounds(mins, maxs);
	VectorClear(average);
	VectorClear(gradient);
	alpha = 0;

	/* dummy check */
	if(rw == NULL || rw->numVerts < 3)
		return;

	/* start sampling */
	samples = 0;

	/* sample vertex colors if no lightmap or this is the initial pass */
	if(lm == NULL || lm->radLuxels[lightmapNum] == NULL || bouncing == qfalse)
	{
		for(samples = 0; samples < rw->numVerts; samples++)
		{
			/* multiply by texture color */
			if(!RadSampleImage
			   (si->lightImage->pixels, si->lightImage->width, si->lightImage->height, rw->verts[samples].st, textureColor))
			{
				VectorCopy(si->averageColor, textureColor);
				textureColor[4] = 255.0f;
			}
			for(i = 0; i < 3; i++)
				color[i] = (textureColor[i] / 255) * (rw->verts[samples].color[lightmapNum][i] / 255.0f);

			AddPointToBounds(color, mins, maxs);
			VectorAdd(average, color, average);

			/* get alpha */
			alpha += (textureColor[3] / 255.0f) * (rw->verts[samples].color[lightmapNum][3] / 255.0f);
		}

		/* set style */
		*style = ds->vertexStyles[lightmapNum];
	}

	/* sample lightmap */
	else
	{
		/* fracture the winding into a fan (including degenerate tris) */
		for(v = 1; v < (rw->numVerts - 1) && samples < MAX_SAMPLES; v++)
		{
			/* get a triangle */
			rv[0] = &rw->verts[0];
			rv[1] = &rw->verts[v];
			rv[2] = &rw->verts[v + 1];

			/* this code is embarassing (really should just rasterize the triangle) */
			for(i = 1; i < SAMPLE_GRANULARITY && samples < MAX_SAMPLES; i++)
			{
				for(j = 1; j < SAMPLE_GRANULARITY && samples < MAX_SAMPLES; j++)
				{
					for(k = 1; k < SAMPLE_GRANULARITY && samples < MAX_SAMPLES; k++)
					{
						/* create a blend vector (barycentric coordinates) */
						blend[0] = i;
						blend[1] = j;
						blend[2] = k;
						bf = (1.0 / (blend[0] + blend[1] + blend[2]));
						VectorScale(blend, bf, blend);

						/* create a blended sample */
						st[0] = st[1] = 0.0f;
						lightmap[0] = lightmap[1] = 0.0f;
						alphaI = 0.0f;
						for(l = 0; l < 3; l++)
						{
							st[0] += (rv[l]->st[0] * blend[l]);
							st[1] += (rv[l]->st[1] * blend[l]);
							lightmap[0] += (rv[l]->lightmap[lightmapNum][0] * blend[l]);
							lightmap[1] += (rv[l]->lightmap[lightmapNum][1] * blend[l]);
							alphaI += (rv[l]->color[lightmapNum][3] * blend[l]);
						}

						/* get lightmap xy coords */
						x = lightmap[0] / (float)superSample;
						y = lightmap[1] / (float)superSample;
						if(x < 0)
							x = 0;
						else if(x >= lm->w)
							x = lm->w - 1;
						if(y < 0)
							y = 0;
						else if(y >= lm->h)
							y = lm->h - 1;

						/* get radiosity luxel */
						radLuxel = RAD_LUXEL(lightmapNum, x, y);

						/* ignore unlit/unused luxels */
						if(radLuxel[0] < 0.0f)
							continue;

						/* inc samples */
						samples++;

						/* multiply by texture color */
						if(!RadSampleImage
						   (si->lightImage->pixels, si->lightImage->width, si->lightImage->height, st, textureColor))
						{
							VectorCopy(si->averageColor, textureColor);
							textureColor[4] = 255;
						}
						for(i = 0; i < 3; i++)
							color[i] = (textureColor[i] / 255) * (radLuxel[i] / 255);

						AddPointToBounds(color, mins, maxs);
						VectorAdd(average, color, average);

						/* get alpha */
						alpha += (textureColor[3] / 255) * (alphaI / 255);
					}
				}
			}
		}

		/* set style */
		*style = ds->lightmapStyles[lightmapNum];
	}

	/* any samples? */
	if(samples <= 0)
		return;

	/* average the color */
	VectorScale(average, (1.0 / samples), average);

	/* create the color gradient */
	//% VectorSubtract( maxs, mins, delta );

	/* new: color gradient will always be 0-1.0, expressed as the range of light relative to overall light */
	//% gradient[ 0 ] = maxs[ 0 ] > 0.0f ? (maxs[ 0 ] - mins[ 0 ]) / maxs[ 0 ] : 0.0f;
	//% gradient[ 1 ] = maxs[ 1 ] > 0.0f ? (maxs[ 1 ] - mins[ 1 ]) / maxs[ 1 ] : 0.0f;
	//% gradient[ 2 ] = maxs[ 2 ] > 0.0f ? (maxs[ 2 ] - mins[ 2 ]) / maxs[ 2 ] : 0.0f;

	/* newer: another contrast function */
	for(i = 0; i < 3; i++)
		gradient[i] = (maxs[i] - mins[i]) * maxs[i];
}



/*
RadSubdivideDiffuseLight()
subdivides a radiosity winding until it is smaller than subdivide, then generates an area light
*/

#define RADIOSITY_MAX_GRADIENT		0.75f	//% 0.25f
#define RADIOSITY_VALUE				500.0f
#define RADIOSITY_MIN				0.0001f
#define RADIOSITY_CLIP_EPSILON		0.125f

static void RadSubdivideDiffuseLight(int lightmapNum, bspDrawSurface_t * ds, rawLightmap_t * lm, shaderInfo_t * si,
									 float scale, float subdivide, qboolean original, radWinding_t * rw, clipWork_t * cw)
{
	int             i, style;
	float           dist, area, value;
	vec3_t          mins, maxs, normal, d1, d2, cross, color, gradient;
	light_t        *light, *splash;
	winding_t      *w;


	/* dummy check */
	if(rw == NULL || rw->numVerts < 3)
		return;

	/* get bounds for winding */
	ClearBounds(mins, maxs);
	for(i = 0; i < rw->numVerts; i++)
		AddPointToBounds(rw->verts[i].xyz, mins, maxs);

	/* subdivide if necessary */
	for(i = 0; i < 3; i++)
	{
		if(maxs[i] - mins[i] > subdivide)
		{
			radWinding_t    front, back;


			/* make axial plane */
			VectorClear(normal);
			normal[i] = 1;
			dist = (maxs[i] + mins[i]) * 0.5f;

			/* clip the winding */
			RadClipWindingEpsilon(rw, normal, dist, RADIOSITY_CLIP_EPSILON, &front, &back, cw);

			/* recurse */
			RadSubdivideDiffuseLight(lightmapNum, ds, lm, si, scale, subdivide, qfalse, &front, cw);
			RadSubdivideDiffuseLight(lightmapNum, ds, lm, si, scale, subdivide, qfalse, &back, cw);
			return;
		}
	}

	/* check area */
	area = 0.0f;
	for(i = 2; i < rw->numVerts; i++)
	{
		VectorSubtract(rw->verts[i - 1].xyz, rw->verts[0].xyz, d1);
		VectorSubtract(rw->verts[i].xyz, rw->verts[0].xyz, d2);
		CrossProduct(d1, d2, cross);
		area += 0.5f * VectorLength(cross);
	}
	if(area < 1.0f || area > 20000000.0f)
		return;

	/* more subdivision may be necessary */
	if(bouncing)
	{
		/* get color sample for the surface fragment */
		RadSample(lightmapNum, ds, lm, si, rw, color, gradient, &style);

		/* if color gradient is too high, subdivide again */
		if(subdivide > minDiffuseSubdivide &&
		   (gradient[0] > RADIOSITY_MAX_GRADIENT || gradient[1] > RADIOSITY_MAX_GRADIENT || gradient[2] > RADIOSITY_MAX_GRADIENT))
		{
			RadSubdivideDiffuseLight(lightmapNum, ds, lm, si, scale, (subdivide / 2.0f), qfalse, rw, cw);
			return;
		}
	}

	/* create a regular winding and an average normal */
	w = AllocWinding(rw->numVerts);
	w->numpoints = rw->numVerts;
	VectorClear(normal);
	for(i = 0; i < rw->numVerts; i++)
	{
		VectorCopy(rw->verts[i].xyz, w->p[i]);
		VectorAdd(normal, rw->verts[i].normal, normal);
	}
	VectorScale(normal, (1.0f / rw->numVerts), normal);
	if(VectorNormalize(normal) == 0.0f)
		return;

	/* early out? */
	if(bouncing && VectorLength(color) < RADIOSITY_MIN)
		return;

	/* debug code */
	//% Sys_Printf( "Size: %d %d %d\n", (int) (maxs[ 0 ] - mins[ 0 ]), (int) (maxs[ 1 ] - mins[ 1 ]), (int) (maxs[ 2 ] - mins[ 2 ]) );
	//% Sys_Printf( "Grad: %f %f %f\n", gradient[ 0 ], gradient[ 1 ], gradient[ 2 ] );

	/* increment counts */
	numDiffuseLights++;
	switch (ds->surfaceType)
	{
		case MST_PLANAR:
			numBrushDiffuseLights++;
			break;

		case MST_TRIANGLE_SOUP:
			numTriangleDiffuseLights++;
			break;

		case MST_PATCH:
			numPatchDiffuseLights++;
			break;
	}

	/* create a light */
	light = safe_malloc(sizeof(*light));
	memset(light, 0, sizeof(*light));

	/* attach it */
	ThreadLock();
	light->next = lights;
	lights = light;
	ThreadUnlock();

	/* initialize the light */
	light->flags = LIGHT_AREA_DEFAULT;
	light->type = EMIT_AREA;
	light->si = si;
	light->fade = 1.0f;
	light->w = w;

	/* set falloff threshold */
	light->falloffTolerance = falloffTolerance;

	/* bouncing light? */
	if(bouncing == qfalse)
	{
		/* handle first-pass lights in normal q3a style */
		value = si->value;
		light->photons = value * area * areaScale;
		light->add = value * formFactorValueScale * areaScale;
		VectorCopy(si->color, light->color);
		VectorScale(light->color, light->add, light->emitColor);
		light->style = noStyles ? LS_NORMAL : si->lightStyle;
		if(light->style < LS_NORMAL || light->style >= LS_NONE)
			light->style = LS_NORMAL;

		/* set origin */
		VectorAdd(mins, maxs, light->origin);
		VectorScale(light->origin, 0.5f, light->origin);

		/* nudge it off the plane a bit */
		VectorCopy(normal, light->normal);
		VectorMA(light->origin, 1.0f, light->normal, light->origin);
		light->dist = DotProduct(light->origin, normal);

		/* optionally create a point splashsplash light for first pass */
		if(original && si->backsplashFraction > 0)
		{
			/* allocate a new point light */
			splash = safe_malloc(sizeof(*splash));
			memset(splash, 0, sizeof(*splash));
			splash->next = lights;
			lights = splash;

			/* set it up */
			splash->flags = LIGHT_Q3A_DEFAULT;
			splash->type = EMIT_POINT;
			splash->photons = light->photons * si->backsplashFraction;
			splash->fade = 1.0f;
			splash->si = si;
			VectorMA(light->origin, si->backsplashDistance, normal, splash->origin);
			VectorCopy(si->color, splash->color);
			splash->falloffTolerance = falloffTolerance;
			splash->style = noStyles ? LS_NORMAL : light->style;

			/* add to counts */
			numPointLights++;
		}
	}
	else
	{
		/* handle bounced light (radiosity) a little differently */
		value = RADIOSITY_VALUE * si->bounceScale * 0.375f;
		light->photons = value * area * bounceScale;
		light->add = value * formFactorValueScale * bounceScale;
		VectorCopy(color, light->color);
		VectorScale(light->color, light->add, light->emitColor);
		light->style = noStyles ? LS_NORMAL : style;
		if(light->style < LS_NORMAL || light->style >= LS_NONE)
			light->style = LS_NORMAL;

		/* set origin */
		WindingCenter(w, light->origin);

		/* nudge it off the plane a bit */
		VectorCopy(normal, light->normal);
		VectorMA(light->origin, 1.0f, light->normal, light->origin);
		light->dist = DotProduct(light->origin, normal);
	}

	/* emit light from both sides? */
	if(si->compileFlags & C_FOG || si->twoSided)
		light->flags |= LIGHT_TWOSIDED;

	//% Sys_Printf( "\nAL: C: (%6f, %6f, %6f) [%6f] N: (%6f, %6f, %6f) %s\n",
	//%     light->color[ 0 ], light->color[ 1 ], light->color[ 2 ], light->add,
	//%     light->normal[ 0 ], light->normal[ 1 ], light->normal[ 2 ],
	//%     light->si->shader );
}



/*
RadLightForTriangles()
creates unbounced diffuse lights for triangle soup (misc_models, etc)
*/

void RadLightForTriangles(int num, int lightmapNum, rawLightmap_t * lm, shaderInfo_t * si, float scale, float subdivide,
						  clipWork_t * cw)
{
	int             i, j, k, v;
	bspDrawSurface_t *ds;
	surfaceInfo_t  *info;
	float          *radVertexLuxel;
	radWinding_t    rw;


	/* get surface */
	ds = &bspDrawSurfaces[num];
	info = &surfaceInfos[num];

	/* each triangle is a potential emitter */
	rw.numVerts = 3;
	for(i = 0; i < ds->numIndexes; i += 3)
	{
		/* copy each vert */
		for(j = 0; j < 3; j++)
		{
			/* get vertex index and rad vertex luxel */
			v = ds->firstVert + bspDrawIndexes[ds->firstIndex + i + j];

			/* get most everything */
			memcpy(&rw.verts[j], &yDrawVerts[v], sizeof(bspDrawVert_t));

			/* fix colors */
			for(k = 0; k < MAX_LIGHTMAPS; k++)
			{
				radVertexLuxel = RAD_VERTEX_LUXEL(k, ds->firstVert + bspDrawIndexes[ds->firstIndex + i + j]);
				VectorCopy(radVertexLuxel, rw.verts[j].color[k]);
				rw.verts[j].color[k][3] = yDrawVerts[v].lightColor[k][3];
			}
		}

		/* subdivide into area lights */
		RadSubdivideDiffuseLight(lightmapNum, ds, lm, si, scale, subdivide, qtrue, &rw, cw);
	}
}



/*
RadLightForPatch()
creates unbounced diffuse lights for patches
*/

#define	PLANAR_EPSILON	0.1f

void RadLightForPatch(int num, int lightmapNum, rawLightmap_t * lm, shaderInfo_t * si, float scale, float subdivide,
					  clipWork_t * cw)
{
	int             i, x, y, v, t, pw[5], r;
	bspDrawSurface_t *ds;
	surfaceInfo_t  *info;
	bspDrawVert_t  *bogus;
	bspDrawVert_t  *dv[4];
	mesh_t          src, *subdivided, *mesh;
	float          *radVertexLuxel;
	float           dist;
	vec4_t          plane;
	qboolean        planar;
	radWinding_t    rw;


	/* get surface */
	ds = &bspDrawSurfaces[num];
	info = &surfaceInfos[num];

	/* construct a bogus vert list with color index stuffed into color[ 0 ] */
	bogus = safe_malloc(ds->numVerts * sizeof(bspDrawVert_t));
	memcpy(bogus, &yDrawVerts[ds->firstVert], ds->numVerts * sizeof(bspDrawVert_t));
	for(i = 0; i < ds->numVerts; i++)
		bogus[i].lightColor[0][0] = i;

	/* build a subdivided mesh identical to shadow facets for this patch */
	/* this MUST MATCH FacetsForPatch() identically! */
	src.width = ds->patchWidth;
	src.height = ds->patchHeight;
	src.verts = bogus;
	//% subdivided = SubdivideMesh( src, 8, 512 );
	subdivided = SubdivideMesh2(src, info->patchIterations);
	PutMeshOnCurve(*subdivided);
	//% MakeMeshNormals( *subdivided );
	mesh = RemoveLinearMeshColumnsRows(subdivided);
	FreeMesh(subdivided);
	free(bogus);

	/* FIXME: build interpolation table into color[ 1 ] */

	/* fix up color indexes */
	for(i = 0; i < (mesh->width * mesh->height); i++)
	{
		dv[0] = &mesh->verts[i];
		if(dv[0]->lightColor[0][0] >= ds->numVerts)
			dv[0]->lightColor[0][0] = ds->numVerts - 1;
	}

	/* iterate through the mesh quads */
	for(y = 0; y < (mesh->height - 1); y++)
	{
		for(x = 0; x < (mesh->width - 1); x++)
		{
			/* set indexes */
			pw[0] = x + (y * mesh->width);
			pw[1] = x + ((y + 1) * mesh->width);
			pw[2] = x + 1 + ((y + 1) * mesh->width);
			pw[3] = x + 1 + (y * mesh->width);
			pw[4] = x + (y * mesh->width);	/* same as pw[ 0 ] */

			/* set radix */
			r = (x + y) & 1;

			/* get drawverts */
			dv[0] = &mesh->verts[pw[r + 0]];
			dv[1] = &mesh->verts[pw[r + 1]];
			dv[2] = &mesh->verts[pw[r + 2]];
			dv[3] = &mesh->verts[pw[r + 3]];

			/* planar? */
			planar = PlaneFromPoints(plane, dv[0]->xyz, dv[1]->xyz, dv[2]->xyz, qtrue);
			if(planar)
			{
				dist = DotProduct(dv[1]->xyz, plane) - plane[3];
				if(fabs(dist) > PLANAR_EPSILON)
					planar = qfalse;
			}

			/* generate a quad */
			if(planar)
			{
				rw.numVerts = 4;
				for(v = 0; v < 4; v++)
				{
					/* get most everything */
					memcpy(&rw.verts[v], dv[v], sizeof(bspDrawVert_t));

					/* fix colors */
					for(i = 0; i < MAX_LIGHTMAPS; i++)
					{
						radVertexLuxel = RAD_VERTEX_LUXEL(i, ds->firstVert + (int) dv[v]->lightColor[0][0]);
						VectorCopy(radVertexLuxel, rw.verts[v].color[i]);
						rw.verts[v].color[i][3] = dv[v]->lightColor[i][3];
					}
				}

				/* subdivide into area lights */
				RadSubdivideDiffuseLight(lightmapNum, ds, lm, si, scale, subdivide, qtrue, &rw, cw);
			}

			/* generate 2 tris */
			else
			{
				rw.numVerts = 3;
				for(t = 0; t < 2; t++)
				{
					for(v = 0; v < 3 + t; v++)
					{
						/* get "other" triangle (stupid hacky logic, but whatevah) */
						if(v == 1 && t == 1)
							v++;

						/* get most everything */
						memcpy(&rw.verts[v], dv[v], sizeof(bspDrawVert_t));

						/* fix colors */
						for(i = 0; i < MAX_LIGHTMAPS; i++)
						{
							radVertexLuxel = RAD_VERTEX_LUXEL(i, ds->firstVert + (int) dv[v]->lightColor[0][0]);
							VectorCopy(radVertexLuxel, rw.verts[v].color[i]);
							rw.verts[v].color[i][3] = dv[v]->lightColor[i][3];
						}
					}

					/* subdivide into area lights */
					RadSubdivideDiffuseLight(lightmapNum, ds, lm, si, scale, subdivide, qtrue, &rw, cw);
				}
			}
		}
	}

	/* free the mesh */
	FreeMesh(mesh);
}




/*
RadLight()
creates unbounced diffuse lights for a given surface
*/

void RadLight(int num)
{
	int             lightmapNum;
	float           scale, subdivide;
	int             contentFlags, surfaceFlags, compileFlags;
	bspDrawSurface_t *ds;
	surfaceInfo_t  *info;
	rawLightmap_t  *lm;
	shaderInfo_t   *si;
	clipWork_t      cw;


	/* get drawsurface, lightmap, and shader info */
	ds = &bspDrawSurfaces[num];
	info = &surfaceInfos[num];
	lm = info->lm;
	si = info->si;
	scale = si->bounceScale;

	/* find nodraw bit */
	contentFlags = surfaceFlags = compileFlags = 0;
	ApplySurfaceParm("nodraw", &contentFlags, &surfaceFlags, &compileFlags);

	// jal : avoid bouncing on trans surfaces
	ApplySurfaceParm("trans", &contentFlags, &surfaceFlags, &compileFlags);
	/* early outs? */
	if(scale <= 0.0f || (si->compileFlags & C_SKY) || si->autosprite ||
	   (bspShaders[ds->shaderNum].contentFlags & contentFlags) || (bspShaders[ds->shaderNum].surfaceFlags & surfaceFlags) ||
	   (si->compileFlags & compileFlags))
		return;

	/* determine how much we need to chop up the surface */
	if(si->lightSubdivide)
		subdivide = si->lightSubdivide;
	else
		subdivide = diffuseSubdivide;

	/* inc counts */
	numDiffuseSurfaces++;

	/* iterate through styles (this could be more efficient, yes) */
	for(lightmapNum = 0; lightmapNum < MAX_LIGHTMAPS; lightmapNum++)
	{
		/* switch on type */
		if(ds->lightmapStyles[lightmapNum] != LS_NONE && ds->lightmapStyles[lightmapNum] != LS_UNUSED)
		{
			switch (ds->surfaceType)
			{
				case MST_PLANAR:
				case MST_TRIANGLE_SOUP:
					RadLightForTriangles(num, lightmapNum, lm, si, scale, subdivide, &cw);
					break;

				case MST_PATCH:
					RadLightForPatch(num, lightmapNum, lm, si, scale, subdivide, &cw);
					break;

				default:
					break;
			}
		}
	}
}



/*
RadCreateDiffuseLights()
creates lights for unbounced light on surfaces in the bsp
*/

int             iterations = 0;

void RadCreateDiffuseLights(void)
{
	/* startup */
	Sys_FPrintf(SYS_VRB, "--- RadCreateDiffuseLights ---\n");
	numDiffuseSurfaces = 0;
	numDiffuseLights = 0;
	numBrushDiffuseLights = 0;
	numTriangleDiffuseLights = 0;
	numPatchDiffuseLights = 0;
	numAreaLights = 0;

	/* hit every surface (threaded) */
	RunThreadsOnIndividual(numBSPDrawSurfaces, qtrue, RadLight);

	/* dump the lights generated to a file */
	if(dump)
	{
		char            dumpName[1024], ext[64];
		FILE           *file;
		light_t        *light;

		strcpy(dumpName, source);
		StripExtension(dumpName);
		sprintf(ext, "_bounce_%03d.map", iterations);
		strcat(dumpName, ext);
		file = fopen(dumpName, "wb");
		Sys_Printf("Writing %s...\n", dumpName);
		if(file)
		{
			for(light = lights; light; light = light->next)
			{
				fprintf(file,
						"{\n"
						"\"classname\" \"light\"\n"
						"\"light\" \"%d\"\n"
						"\"origin\" \"%.0f %.0f %.0f\"\n"
						"\"_color\" \"%.3f %.3f %.3f\"\n"
						"}\n",
						(int)light->add,
						light->origin[0], light->origin[1], light->origin[2], light->color[0], light->color[1], light->color[2]);
			}
			fclose(file);
		}
	}

	/* increment */
	iterations++;

	/* print counts */
	Sys_Printf("%8d diffuse surfaces\n", numDiffuseSurfaces);
	Sys_FPrintf(SYS_VRB, "%8d total diffuse lights\n", numDiffuseLights);
	Sys_FPrintf(SYS_VRB, "%8d brush diffuse lights\n", numBrushDiffuseLights);
	Sys_FPrintf(SYS_VRB, "%8d patch diffuse lights\n", numPatchDiffuseLights);
	Sys_FPrintf(SYS_VRB, "%8d triangle diffuse lights\n", numTriangleDiffuseLights);
}