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light_trace.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_TRACE_C
/* dependencies */
#include "kmap2.h"
#define Vector2Copy( a, b ) ((b)[ 0 ] = (a)[ 0 ], (b)[ 1 ] = (a)[ 1 ])
#define Vector4Copy( a, b ) ((b)[ 0 ] = (a)[ 0 ], (b)[ 1 ] = (a)[ 1 ], (b)[ 2 ] = (a)[ 2 ], (b)[ 3 ] = (a)[ 3 ])
#define MAX_NODE_ITEMS 5
#define MAX_NODE_TRIANGLES 5
#define MAX_TRACE_DEPTH 32
#define MIN_NODE_SIZE 512 //32.0f
#define GROW_TRACE_INFOS 32768 //% 4096
#define GROW_TRACE_WINDINGS 65536 //% 32768
#define GROW_TRACE_TRIANGLES 131072 //% 32768
#define GROW_TRACE_NODES 16384 //% 16384
#define GROW_NODE_ITEMS 16 //% 256
#define MAX_TW_VERTS 24 // vortex: increased from 12 to 24 for ability co compile some insane maps with large curve count
#define TRACE_ON_EPSILON 0.1f
#define TRACE_LEAF -1
#define TRACE_LEAF_SOLID -2
typedef struct traceVert_s
{
vec3_t xyz;
float st[2];
}
traceVert_t;
typedef struct traceInfo_s
{
shaderInfo_t *si;
int surfaceNum, castShadows, skipGrid;
}
traceInfo_t;
typedef struct traceWinding_s
{
vec4_t plane;
int infoNum, numVerts;
traceVert_t v[MAX_TW_VERTS];
}
traceWinding_t;
typedef struct traceTriangle_s
{
vec3_t edge1, edge2;
int infoNum;
traceVert_t v[3];
}
traceTriangle_t;
typedef struct traceNode_s
{
int type;
vec4_t plane;
vec3_t mins, maxs;
int children[2];
int numItems, maxItems;
int *items;
}
traceNode_t;
int noDrawContentFlags, noDrawSurfaceFlags, noDrawCompileFlags;
int numTraceInfos = 0, maxTraceInfos = 0, firstTraceInfo = 0;
traceInfo_t *traceInfos = NULL;
int numTraceWindings = 0, maxTraceWindings = 0, deadWinding = -1;
traceWinding_t *traceWindings = NULL;
int numTraceTriangles = 0, maxTraceTriangles = 0, deadTriangle = -1;
traceTriangle_t *traceTriangles = NULL;
int headNodeNum = 0, skyboxNodeNum = 0, maxTraceDepth = 0, numTraceLeafNodes = 0;
int numTraceNodes = 0, maxTraceNodes = 0;
traceNode_t *traceNodes = NULL;
/* -------------------------------------------------------------------------------
allocation and list management
------------------------------------------------------------------------------- */
/*
AddTraceInfo() - ydnar
adds a trace info structure to the pool
*/
static int AddTraceInfo(traceInfo_t * ti)
{
int num;
void *temp;
/* find an existing info */
for(num = firstTraceInfo; num < numTraceInfos; num++)
{
if(traceInfos[num].si == ti->si &&
traceInfos[num].surfaceNum == ti->surfaceNum &&
traceInfos[num].castShadows == ti->castShadows && traceInfos[num].skipGrid == ti->skipGrid)
return num;
}
/* enough space? */
if(numTraceInfos >= maxTraceInfos)
{
/* allocate more room */
maxTraceInfos += GROW_TRACE_INFOS;
temp = safe_malloc(maxTraceInfos * sizeof(*traceInfos));
if(traceInfos != NULL)
{
memcpy(temp, traceInfos, numTraceInfos * sizeof(*traceInfos));
free(traceInfos);
}
traceInfos = (traceInfo_t *) temp;
}
/* add the info */
memcpy(&traceInfos[num], ti, sizeof(*traceInfos));
if(num == numTraceInfos)
numTraceInfos++;
/* return the ti number */
return num;
}
/*
AllocTraceNode() - ydnar
allocates a new trace node
*/
static int AllocTraceNode(void)
{
traceNode_t *temp;
/* enough space? */
if(numTraceNodes >= maxTraceNodes)
{
/* reallocate more room */
maxTraceNodes += GROW_TRACE_NODES;
temp = safe_malloc(maxTraceNodes * sizeof(traceNode_t));
if(traceNodes != NULL)
{
memcpy(temp, traceNodes, numTraceNodes * sizeof(traceNode_t));
free(traceNodes);
}
traceNodes = temp;
}
/* add the node */
memset(&traceNodes[numTraceNodes], 0, sizeof(traceNode_t));
traceNodes[numTraceNodes].type = TRACE_LEAF;
ClearBounds(traceNodes[numTraceNodes].mins, traceNodes[numTraceNodes].maxs);
/* Sys_Printf("alloc node %d\n", numTraceNodes); */
numTraceNodes++;
/* return the count */
return (numTraceNodes - 1);
}
/*
AddTraceWinding() - ydnar
adds a winding to the raytracing pool
*/
static int AddTraceWinding(traceWinding_t * tw)
{
int num;
void *temp;
/* check for a dead winding */
if(deadWinding >= 0 && deadWinding < numTraceWindings)
num = deadWinding;
else
{
/* put winding at the end of the list */
num = numTraceWindings;
/* enough space? */
if(numTraceWindings >= maxTraceWindings)
{
/* allocate more room */
maxTraceWindings += GROW_TRACE_WINDINGS;
temp = safe_malloc(maxTraceWindings * sizeof(*traceWindings));
if(traceWindings != NULL)
{
memcpy(temp, traceWindings, numTraceWindings * sizeof(*traceWindings));
free(traceWindings);
}
traceWindings = (traceWinding_t *) temp;
}
}
/* add the winding */
memcpy(&traceWindings[num], tw, sizeof(*traceWindings));
if(num == numTraceWindings)
numTraceWindings++;
deadWinding = -1;
/* return the winding number */
return num;
}
/*
AddTraceTriangle() - ydnar
adds a triangle to the raytracing pool
*/
static int AddTraceTriangle(traceTriangle_t * tt)
{
int num;
void *temp;
/* check for a dead triangle */
if(deadTriangle >= 0 && deadTriangle < numTraceTriangles)
num = deadTriangle;
else
{
/* put triangle at the end of the list */
num = numTraceTriangles;
/* enough space? */
if(numTraceTriangles >= maxTraceTriangles)
{
/* allocate more room */
maxTraceTriangles += GROW_TRACE_TRIANGLES;
temp = safe_malloc(maxTraceTriangles * sizeof(*traceTriangles));
if(traceTriangles != NULL)
{
memcpy(temp, traceTriangles, numTraceTriangles * sizeof(*traceTriangles));
free(traceTriangles);
}
traceTriangles = (traceTriangle_t *) temp;
}
}
/* find vectors for two edges sharing the first vert */
VectorSubtract(tt->v[1].xyz, tt->v[0].xyz, tt->edge1);
VectorSubtract(tt->v[2].xyz, tt->v[0].xyz, tt->edge2);
/* add the triangle */
memcpy(&traceTriangles[num], tt, sizeof(*traceTriangles));
if(num == numTraceTriangles)
numTraceTriangles++;
deadTriangle = -1;
/* return the triangle number */
return num;
}
/*
AddItemToTraceNode() - ydnar
adds an item reference (winding or triangle) to a trace node
*/
static int AddItemToTraceNode(traceNode_t * node, int num)
{
void *temp;
/* dummy check */
if(num < 0)
return -1;
/* enough space? */
if(node->numItems >= node->maxItems)
{
/* allocate more room */
if(node == traceNodes)
node->maxItems *= 2;
else
node->maxItems += GROW_NODE_ITEMS;
if(node->maxItems <= 0)
node->maxItems = GROW_NODE_ITEMS;
temp = safe_malloc(node->maxItems * sizeof(*node->items));
if(node->items != NULL)
{
memcpy(temp, node->items, node->numItems * sizeof(*node->items));
free(node->items);
}
node->items = (int *)temp;
}
/* add the poly */
node->items[node->numItems] = num;
node->numItems++;
/* return the count */
return (node->numItems - 1);
}
/* -------------------------------------------------------------------------------
trace node setup
------------------------------------------------------------------------------- */
/*
SetupTraceNodes_r() - ydnar
recursively create the initial trace node structure from the bsp tree
*/
static int SetupTraceNodes_r(int bspNodeNum)
{
int i, nodeNum, bspLeafNum, newNode;
bspPlane_t *plane;
bspNode_t *bspNode;
/* get bsp node and plane */
bspNode = &bspNodes[bspNodeNum];
plane = &bspPlanes[bspNode->planeNum];
/* allocate a new trace node */
nodeNum = AllocTraceNode();
/* setup trace node */
traceNodes[nodeNum].type = PlaneTypeForNormal(plane->normal);
VectorCopy(plane->normal, traceNodes[nodeNum].plane);
traceNodes[nodeNum].plane[3] = plane->dist;
/* setup children */
for(i = 0; i < 2; i++)
{
/* leafnode */
if(bspNode->children[i] < 0)
{
bspLeafNum = -bspNode->children[i] - 1;
/* new code */
newNode = AllocTraceNode();
traceNodes[nodeNum].children[i] = newNode;
/* have to do this separately, as gcc first executes LHS, then RHS, and if a realloc took place, this fails */
if(bspLeafs[bspLeafNum].cluster == -1)
traceNodes[traceNodes[nodeNum].children[i]].type = TRACE_LEAF_SOLID;
}
/* normal node */
else
{
newNode = SetupTraceNodes_r(bspNode->children[i]);
traceNodes[nodeNum].children[i] = newNode;
}
if(traceNodes[nodeNum].children[i] == 0)
Error("Invalid tracenode allocated");
}
/* Sys_Printf("node %d children: %d %d\n", nodeNum, traceNodes[ nodeNum ].children[0], traceNodes[ nodeNum ].children[1]); */
/* return node number */
return nodeNum;
}
/*
ClipTraceWinding() - ydnar
clips a trace winding against a plane into one or two parts
*/
#define TW_ON_EPSILON 0.25f
void ClipTraceWinding(traceWinding_t * tw, vec4_t plane, traceWinding_t * front, traceWinding_t * back)
{
int i, j, k;
int sides[MAX_TW_VERTS], counts[3] = { 0, 0, 0 };
float dists[MAX_TW_VERTS];
float frac;
traceVert_t *a, *b, mid;
/* clear front and back */
front->numVerts = 0;
back->numVerts = 0;
/* classify points */
for(i = 0; i < tw->numVerts; i++)
{
dists[i] = DotProduct(tw->v[i].xyz, plane) - plane[3];
if(dists[i] < -TW_ON_EPSILON)
sides[i] = SIDE_BACK;
else if(dists[i] > TW_ON_EPSILON)
sides[i] = SIDE_FRONT;
else
sides[i] = SIDE_ON;
counts[sides[i]]++;
}
/* entirely on front? */
if(counts[SIDE_BACK] == 0)
memcpy(front, tw, sizeof(*front));
/* entirely on back? */
else if(counts[SIDE_FRONT] == 0)
memcpy(back, tw, sizeof(*back));
/* straddles the plane */
else
{
/* setup front and back */
memcpy(front, tw, sizeof(*front));
front->numVerts = 0;
memcpy(back, tw, sizeof(*back));
back->numVerts = 0;
/* split the winding */
for(i = 0; i < tw->numVerts; i++)
{
/* radix */
j = (i + 1) % tw->numVerts;
/* get verts */
a = &tw->v[i];
b = &tw->v[j];
/* handle points on the splitting plane */
switch (sides[i])
{
case SIDE_FRONT:
if(front->numVerts >= MAX_TW_VERTS)
Error("MAX_TW_VERTS (%d) exceeded", MAX_TW_VERTS);
front->v[front->numVerts++] = *a;
break;
case SIDE_BACK:
if(back->numVerts >= MAX_TW_VERTS)
Error("MAX_TW_VERTS (%d) exceeded", MAX_TW_VERTS);
back->v[back->numVerts++] = *a;
break;
case SIDE_ON:
if(front->numVerts >= MAX_TW_VERTS || back->numVerts >= MAX_TW_VERTS)
Error("MAX_TW_VERTS (%d) exceeded", MAX_TW_VERTS);
front->v[front->numVerts++] = *a;
back->v[back->numVerts++] = *a;
continue;
}
/* check next point to see if we need to split the edge */
if(sides[j] == SIDE_ON || sides[j] == sides[i])
continue;
/* check limit */
if(front->numVerts >= MAX_TW_VERTS || back->numVerts >= MAX_TW_VERTS)
Error("MAX_TW_VERTS (%d) exceeded", MAX_TW_VERTS);
/* generate a split point */
frac = dists[i] / (dists[i] - dists[j]);
for(k = 0; k < 3; k++)
{
/* minimize fp precision errors */
if(plane[k] == 1.0f)
mid.xyz[k] = plane[3];
else if(plane[k] == -1.0f)
mid.xyz[k] = -plane[3];
else
mid.xyz[k] = a->xyz[k] + frac * (b->xyz[k] - a->xyz[k]);
/* set texture coordinates */
if(k > 1)
continue;
mid.st[0] = a->st[0] + frac * (b->st[0] - a->st[0]);
mid.st[1] = a->st[1] + frac * (b->st[1] - a->st[1]);
}
/* copy midpoint to front and back polygons */
front->v[front->numVerts++] = mid;
back->v[back->numVerts++] = mid;
}
}
}
/*
FilterPointToTraceNodes_r() - ydnar
debugging tool
*/
static int FilterPointToTraceNodes_r(vec3_t pt, int nodeNum)
{
float dot;
traceNode_t *node;
if(nodeNum < 0 || nodeNum >= numTraceNodes)
return -1;
node = &traceNodes[nodeNum];
if(node->type >= 0)
{
dot = DotProduct(pt, node->plane) - node->plane[3];
if(dot > -0.001f)
FilterPointToTraceNodes_r(pt, node->children[0]);
if(dot < 0.001f)
FilterPointToTraceNodes_r(pt, node->children[1]);
return -1;
}
Sys_Printf("%d ", nodeNum);
return nodeNum;
}
/*
FilterTraceWindingIntoNodes_r() - ydnar
filters a trace winding into the raytracing tree
*/
static void FilterTraceWindingIntoNodes_r(traceWinding_t * tw, int nodeNum)
{
int num;
vec4_t plane1, plane2, reverse;
traceNode_t *node;
traceWinding_t front, back;
/* don't filter if passed a bogus node (solid, etc) */
if(nodeNum < 0 || nodeNum >= numTraceNodes)
return;
/* get node */
node = &traceNodes[nodeNum];
/* is this a decision node? */
if(node->type >= 0)
{
/* create winding plane if necessary, filtering out bogus windings as well */
if(nodeNum == headNodeNum)
{
if(!PlaneFromPoints(tw->plane, tw->v[0].xyz, tw->v[1].xyz, tw->v[2].xyz, qtrue))
return;
}
/* validate the node */
if(node->children[0] == 0 || node->children[1] == 0)
Error("Invalid tracenode: %d", nodeNum);
/* get node plane */
Vector4Copy(node->plane, plane1);
/* get winding plane */
Vector4Copy(tw->plane, plane2);
/* invert surface plane */
VectorSubtract(vec3_origin, plane2, reverse);
reverse[3] = -plane2[3];
/* front only */
if(DotProduct(plane1, plane2) > 0.999f && fabs(plane1[3] - plane2[3]) < 0.001f)
{
FilterTraceWindingIntoNodes_r(tw, node->children[0]);
return;
}
/* back only */
if(DotProduct(plane1, reverse) > 0.999f && fabs(plane1[3] - reverse[3]) < 0.001f)
{
FilterTraceWindingIntoNodes_r(tw, node->children[1]);
return;
}
/* clip the winding by node plane */
ClipTraceWinding(tw, plane1, &front, &back);
/* filter by node plane */
if(front.numVerts >= 3)
FilterTraceWindingIntoNodes_r(&front, node->children[0]);
if(back.numVerts >= 3)
FilterTraceWindingIntoNodes_r(&back, node->children[1]);
/* return to caller */
return;
}
/* add winding to leaf node */
num = AddTraceWinding(tw);
AddItemToTraceNode(node, num);
}
/*
SubdivideTraceNode_r() - ydnar
recursively subdivides a tracing node until it meets certain size and complexity criteria
*/
static void SubdivideTraceNode_r(int nodeNum, int depth)
{
int i, j, count, num, frontNum, backNum, type;
vec3_t size;
float dist;
double average[3];
traceNode_t *node, *frontNode, *backNode;
traceWinding_t *tw, front, back;
/* dummy check */
if(nodeNum < 0 || nodeNum >= numTraceNodes)
return;
/* get node */
node = &traceNodes[nodeNum];
/* runaway recursion check */
if(depth >= MAX_TRACE_DEPTH)
{
//% Sys_Printf( "Depth: (%d items)\n", node->numItems );
numTraceLeafNodes++;
return;
}
depth++;
/* is this a decision node? */
if(node->type >= 0)
{
/* subdivide children */
frontNum = node->children[0];
backNum = node->children[1];
SubdivideTraceNode_r(frontNum, depth);
SubdivideTraceNode_r(backNum, depth);
return;
}
/* bound the node */
ClearBounds(node->mins, node->maxs);
VectorClear(average);
count = 0;
for(i = 0; i < node->numItems; i++)
{
/* get winding */
tw = &traceWindings[node->items[i]];
/* walk its verts */
for(j = 0; j < tw->numVerts; j++)
{
AddPointToBounds(tw->v[j].xyz, node->mins, node->maxs);
average[0] += tw->v[j].xyz[0];
average[1] += tw->v[j].xyz[1];
average[2] += tw->v[j].xyz[2];
count++;
}
}
/* check triangle limit */
//% if( node->numItems <= MAX_NODE_ITEMS )
if((count - (node->numItems * 2)) < MAX_NODE_TRIANGLES)
{
//% Sys_Printf( "Limit: (%d triangles)\n", (count - (node->numItems * 2)) );
numTraceLeafNodes++;
return;
}
/* the largest dimension of the bounding box will be the split axis */
VectorSubtract(node->maxs, node->mins, size);
if(size[0] >= size[1] && size[0] >= size[2])
type = PLANE_X;
else if(size[1] >= size[0] && size[1] >= size[2])
type = PLANE_Y;
else
type = PLANE_Z;
/* don't split small nodes */
if(size[type] <= MIN_NODE_SIZE)
{
//% Sys_Printf( "Limit: %f %f %f (%d items)\n", size[ 0 ], size[ 1 ], size[ 2 ], node->numItems );
numTraceLeafNodes++;
return;
}
/* set max trace depth */
if(depth > maxTraceDepth)
maxTraceDepth = depth;
/* snap the average */
dist = floor(average[type] / count);
/* dummy check it */
if(dist <= node->mins[type] || dist >= node->maxs[type])
dist = floor(0.5f * (node->mins[type] + node->maxs[type]));
/* allocate child nodes */
frontNum = AllocTraceNode();
backNum = AllocTraceNode();
/* reset pointers */
node = &traceNodes[nodeNum];
frontNode = &traceNodes[frontNum];
backNode = &traceNodes[backNum];
/* attach children */
node->type = type;
node->plane[type] = 1.0f;
node->plane[3] = dist;
node->children[0] = frontNum;
node->children[1] = backNum;
/* setup front node */
frontNode->maxItems = (node->maxItems >> 1);
frontNode->items = safe_malloc(frontNode->maxItems * sizeof(*frontNode->items));
/* setup back node */
backNode->maxItems = (node->maxItems >> 1);
backNode->items = safe_malloc(backNode->maxItems * sizeof(*backNode->items));
/* filter windings into child nodes */
for(i = 0; i < node->numItems; i++)
{
/* get winding */
tw = &traceWindings[node->items[i]];
/* clip the winding by the new split plane */
ClipTraceWinding(tw, node->plane, &front, &back);
/* kill the existing winding */
if(front.numVerts >= 3 || back.numVerts >= 3)
deadWinding = node->items[i];
/* add front winding */
if(front.numVerts >= 3)
{
num = AddTraceWinding(&front);
AddItemToTraceNode(frontNode, num);
}
/* add back winding */
if(back.numVerts >= 3)
{
num = AddTraceWinding(&back);
AddItemToTraceNode(backNode, num);
}
}
/* free original node winding list */
node->numItems = 0;
node->maxItems = 0;
free(node->items);
node->items = NULL;
/* check children */
if(frontNode->numItems <= 0)
{
frontNode->maxItems = 0;
free(frontNode->items);
frontNode->items = NULL;
}
if(backNode->numItems <= 0)
{
backNode->maxItems = 0;
free(backNode->items);
backNode->items = NULL;
}
/* subdivide children */
SubdivideTraceNode_r(frontNum, depth);
SubdivideTraceNode_r(backNum, depth);
}
/*
TriangulateTraceNode_r()
optimizes the tracing data by changing trace windings into triangles
*/
static int TriangulateTraceNode_r(int nodeNum)
{
int i, j, num, frontNum, backNum, numWindings, *windings;
traceNode_t *node;
traceWinding_t *tw;
traceTriangle_t tt;
/* dummy check */
if(nodeNum < 0 || nodeNum >= numTraceNodes)
return 0;
/* get node */
node = &traceNodes[nodeNum];
/* is this a decision node? */
if(node->type >= 0)
{
/* triangulate children */
frontNum = node->children[0];
backNum = node->children[1];
node->numItems = TriangulateTraceNode_r(frontNum);
node->numItems += TriangulateTraceNode_r(backNum);
return node->numItems;
}
/* empty node? */
if(node->numItems == 0)
{
node->maxItems = 0;
if(node->items != NULL)
free(node->items);
return node->numItems;
}
/* store off winding data */
numWindings = node->numItems;
windings = node->items;
/* clear it */
node->numItems = 0;
node->maxItems = numWindings * 2;
node->items = safe_malloc(node->maxItems * sizeof(tt));
/* walk winding list */
for(i = 0; i < numWindings; i++)
{
/* get winding */
tw = &traceWindings[windings[i]];
/* initial setup */
tt.infoNum = tw->infoNum;
tt.v[0] = tw->v[0];
/* walk vertex list */
for(j = 1; j + 1 < tw->numVerts; j++)
{
/* set verts */
tt.v[1] = tw->v[j];
tt.v[2] = tw->v[j + 1];
/* find vectors for two edges sharing the first vert */
VectorSubtract(tt.v[1].xyz, tt.v[0].xyz, tt.edge1);
VectorSubtract(tt.v[2].xyz, tt.v[0].xyz, tt.edge2);
/* add it to the node */
num = AddTraceTriangle(&tt);
AddItemToTraceNode(node, num);
}
}
/* free windings */
if(windings != NULL)
free(windings);
/* return item count */
return node->numItems;
}
/* -------------------------------------------------------------------------------
shadow casting item setup (triangles, patches, entities)
------------------------------------------------------------------------------- */
/*
PopulateWithBSPModel() - ydnar
filters a bsp model's surfaces into the raytracing tree
*/
static void PopulateWithBSPModel(bspModel_t * model, matrix_t transform)
{
int i, j, x, y, pw[5], r, nodeNum;
bspDrawSurface_t *ds;
surfaceInfo_t *info;
bspDrawVert_t *verts;
int *indexes;
mesh_t srcMesh, *mesh, *subdivided;
traceInfo_t ti;
traceWinding_t tw;
/* dummy check */
if(model == NULL || transform == NULL)
return;
/* walk the list of surfaces in this model and fill out the info structs */
for(i = 0; i < model->numBSPSurfaces; i++)
{
/* get surface and info */
ds = &bspDrawSurfaces[model->firstBSPSurface + i];
info = &surfaceInfos[model->firstBSPSurface + i];
if(info->si == NULL)
continue;
/* no shadows */
if(!info->castShadows)
continue;
/* patchshadows? */
if(ds->surfaceType == MST_PATCH && patchShadows == qfalse)
continue;
/* some surfaces in the bsp might have been tagged as nodraw, with a bogus shader */
if((bspShaders[ds->shaderNum].contentFlags & noDrawContentFlags) ||
(bspShaders[ds->shaderNum].surfaceFlags & noDrawSurfaceFlags))
continue;
/* translucent surfaces that are neither alphashadow or lightfilter don't cast shadows */
if((info->si->compileFlags & C_NODRAW))
continue;
if((info->si->compileFlags & C_TRANSLUCENT) &&
!(info->si->compileFlags & C_ALPHASHADOW) && !(info->si->compileFlags & C_LIGHTFILTER))
continue;
/* setup trace info */
ti.si = info->si;
ti.castShadows = info->castShadows;
ti.surfaceNum = model->firstBSPBrush + i;
ti.skipGrid = (ds->surfaceType == MST_PATCH);
/* choose which node (normal or skybox) */
if(info->parentSurfaceNum >= 0)
{
nodeNum = skyboxNodeNum;
/* sky surfaces in portal skies are ignored */
if(info->si->compileFlags & C_SKY)
continue;
}
else
nodeNum = headNodeNum;
/* setup trace winding */
memset(&tw, 0, sizeof(tw));
tw.infoNum = AddTraceInfo(&ti);
tw.numVerts = 3;
/* switch on type */
switch (ds->surfaceType)
{
/* handle patches */
case MST_PATCH:
/* subdivide the surface */
srcMesh.width = ds->patchWidth;
srcMesh.height = ds->patchHeight;
srcMesh.verts = &bspDrawVerts[ds->firstVert];
//% subdivided = SubdivideMesh( srcMesh, 8, 512 );
subdivided = SubdivideMesh2(srcMesh, info->patchIterations);
/* fit it to the curve and remove colinear verts on rows/columns */
PutMeshOnCurve(*subdivided);