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ericw-tools/light/trace_embree.cc

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/* Copyright (C) 2016 Eric Wasylishen
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
See file, 'COPYING', for details.
*/
#include <light/light.hh>
#include <light/bounce.hh>
#include <light/trace_embree.hh>
#include <light/ltface.hh>
#include <common/bsputils.hh>
#include <common/polylib.hh>
#include <embree3/rtcore.h>
#include <embree3/rtcore_ray.h>
#include <vector>
#include <cassert>
#include <cstdlib>
#include <limits>
#ifdef _MSC_VER
#include <malloc.h>
#endif
using namespace std;
using namespace polylib;
class sceneinfo {
public:
unsigned geomID;
std::vector<const bsp2_dface_t *> triToFace;
std::vector<const modelinfo_t *> triToModelinfo;
};
class raystream_embree_common_t;
struct ray_source_info : public RTCIntersectContext {
raystream_embree_common_t *raystream; // may be null if this ray is not from a ray stream
const modelinfo_t *self;
/// only used if raystream == null
int singleRayShadowStyle;
ray_source_info(raystream_embree_common_t *raystream_,
const modelinfo_t *self_) :
raystream(raystream_),
self(self_),
singleRayShadowStyle(0) {
rtcInitIntersectContext(this);
flags = RTC_INTERSECT_CONTEXT_FLAG_COHERENT;
}
};
/**
* Returns 1.0 unless a custom alpha value is set.
* The priority is: "_light_alpha" (read from extended_texinfo_flags), then "alpha"
*/
static float
Face_Alpha(const modelinfo_t *modelinfo, const bsp2_dface_t *face)
{
const uint64_t extended_flags = extended_texinfo_flags[face->texinfo];
// for _light_alpha, 0 is considered unset
const uint64_t alpha_u7 = (extended_flags >> TEX_LIGHT_ALPHA_SHIFT) & 127ULL;
const float alpha_float = (float)alpha_u7 / (float)127;
if (alpha_float != 0.0f) {
return alpha_float;
}
// next check modelinfo alpha (defaults to 1.0)
return modelinfo->alpha.floatValue();
}
sceneinfo
CreateGeometry(const mbsp_t *bsp, RTCDevice g_device, RTCScene scene, const std::vector<const bsp2_dface_t *> &faces)
{
// count triangles
int numtris = 0;
for (const bsp2_dface_t *face : faces) {
if (face->numedges < 3)
continue;
numtris += (face->numedges - 2);
}
unsigned int geomID;
RTCGeometry geom_0 = rtcNewGeometry (g_device, RTC_GEOMETRY_TYPE_TRIANGLE);
rtcSetGeometryBuildQuality(geom_0,RTC_BUILD_QUALITY_MEDIUM);
rtcSetGeometryTimeStepCount(geom_0,1);
geomID = rtcAttachGeometry(scene,geom_0);
rtcReleaseGeometry(geom_0);
struct Vertex { float point[4]; }; //4th element is padding
struct Triangle { int v0, v1, v2; };
// fill in vertices
Vertex* vertices = (Vertex*) rtcSetNewGeometryBuffer(geom_0,RTC_BUFFER_TYPE_VERTEX,0,RTC_FORMAT_FLOAT3,4*sizeof(float),bsp->numvertexes);
for (int i=0; i<bsp->numvertexes; i++) {
const dvertex_t *dvertex = &bsp->dvertexes[i];
Vertex *vert = &vertices[i];
for (int j=0; j<3; j++) {
vert->point[j] = dvertex->point[j];
}
}
sceneinfo s;
s.geomID = geomID;
// fill in triangles
Triangle* triangles = (Triangle*) rtcSetNewGeometryBuffer(geom_0,RTC_BUFFER_TYPE_INDEX,0,RTC_FORMAT_UINT3,3*sizeof(int),numtris);
int tri_index = 0;
for (const bsp2_dface_t *face : faces) {
if (face->numedges < 3)
continue;
// NOTE: can be null for "skip" faces
const modelinfo_t *modelinfo = ModelInfoForFace(bsp, Face_GetNum(bsp, face));
for (int j = 2; j < face->numedges; j++) {
Triangle *tri = &triangles[tri_index];
tri->v0 = Face_VertexAtIndex(bsp, face, j-1);
tri->v1 = Face_VertexAtIndex(bsp, face, j);
tri->v2 = Face_VertexAtIndex(bsp, face, 0);
tri_index++;
s.triToFace.push_back(face);
s.triToModelinfo.push_back(modelinfo);
}
}
rtcCommitGeometry(geom_0);
return s;
}
void
CreateGeometryFromWindings(RTCDevice g_device, RTCScene scene, const std::vector<winding_t *> &windings)
{
if (windings.empty())
return;
// count triangles
int numtris = 0;
int numverts = 0;
for (const auto &winding : windings) {
Q_assert(winding->numpoints >= 3);
numtris += (winding->numpoints - 2);
numverts += winding->numpoints;
}
unsigned int geomID;
RTCGeometry geom_1 = rtcNewGeometry (g_device, RTC_GEOMETRY_TYPE_TRIANGLE);
rtcSetGeometryBuildQuality(geom_1,RTC_BUILD_QUALITY_MEDIUM);
rtcSetGeometryTimeStepCount(geom_1,1);
geomID = rtcAttachGeometry(scene,geom_1);
rtcReleaseGeometry(geom_1);
struct Vertex { float point[4]; }; //4th element is padding
struct Triangle { int v0, v1, v2; };
// fill in vertices
Vertex* vertices = (Vertex*) rtcSetNewGeometryBuffer(geom_1,RTC_BUFFER_TYPE_VERTEX,0,RTC_FORMAT_FLOAT3,4*sizeof(float),numverts);
{
int vert_index = 0;
for (const auto &winding : windings) {
for (int j=0; j<winding->numpoints; j++) {
for (int k=0; k<3; k++) {
vertices[vert_index + j].point[k] = winding->p[j][k];
}
}
vert_index += winding->numpoints;
}
}
// fill in triangles
Triangle* triangles = (Triangle*) rtcSetNewGeometryBuffer(geom_1,RTC_BUFFER_TYPE_INDEX,0,RTC_FORMAT_UINT3,3*sizeof(int),numtris);
int tri_index = 0;
int vert_index = 0;
for (const auto &winding : windings) {
for (int j = 2; j < winding->numpoints; j++) {
Triangle *tri = &triangles[tri_index];
tri->v0 = vert_index + (j-1);
tri->v1 = vert_index + j;
tri->v2 = vert_index + 0;
tri_index++;
}
vert_index += winding->numpoints;
}
Q_assert(vert_index == numverts);
Q_assert(tri_index == numtris);
rtcCommitGeometry(geom_1);
}
RTCDevice device;
RTCScene scene;
sceneinfo skygeom; // sky. always occludes.
sceneinfo solidgeom; // solids. always occludes.
sceneinfo filtergeom; // conditional occluders.. needs to run ray intersection filter
static const mbsp_t *bsp_static;
void ErrorCallback(void* userptr, const RTCError code, const char* str)
{
printf("RTC Error %d: %s\n", code, str);
}
static const sceneinfo &
Embree_SceneinfoForGeomID(unsigned int geomID)
{
if (geomID == skygeom.geomID) {
return skygeom;
} else if (geomID == solidgeom.geomID) {
return solidgeom;
} else if (geomID == filtergeom.geomID) {
return filtergeom;
} else {
Error("unexpected geomID");
throw; //mxd. Added to silence compiler warning
}
}
const bsp2_dface_t *Embree_LookupFace(unsigned int geomID, unsigned int primID)
{
const sceneinfo &info = Embree_SceneinfoForGeomID(geomID);
return info.triToFace.at(primID);
}
const modelinfo_t *Embree_LookupModelinfo(unsigned int geomID, unsigned int primID)
{
const sceneinfo &info = Embree_SceneinfoForGeomID(geomID);
return info.triToModelinfo.at(primID);
}
static void
Embree_RayEndpoint(RTCRayN* ray, size_t N, size_t i, vec3_t endpoint)
{
vec3_t dir;
dir[0] = RTCRayN_dir_x(ray, N, i);
dir[1] = RTCRayN_dir_y(ray, N, i);
dir[2] = RTCRayN_dir_z(ray, N, i);
VectorNormalize(dir);
vec3_t org;
org[0] = RTCRayN_org_x(ray, N, i);
org[1] = RTCRayN_org_y(ray, N, i);
org[2] = RTCRayN_org_z(ray, N, i);
float tfar = RTCRayN_tfar(ray, N, i);
VectorMA(org, tfar, dir, endpoint);
}
enum class filtertype_t {
INTERSECTION, OCCLUSION
};
void AddGlassToRay(RTCIntersectContext* context, unsigned rayIndex, float opacity, const vec3_t glasscolor);
void AddDynamicOccluderToRay(RTCIntersectContext* context, unsigned rayIndex, int style);
// called to evaluate transparency
template<filtertype_t filtertype>
static void
Embree_FilterFuncN(const struct RTCFilterFunctionNArguments* args)
{
int* const valid = args->valid;
void* const userDataPtr = args->geometryUserPtr;
RTCIntersectContext* const context = args->context;
struct RTCRayN* const ray = args->ray;
struct RTCHitN* const potentialHit = args->hit;
const unsigned int N = args->N;
const int VALID = -1;
const int INVALID = 0;
const ray_source_info *rsi = static_cast<const ray_source_info *>(context);
for (size_t i=0; i<N; i++) {
if (valid[i] != VALID) {
// we only need to handle valid rays
continue;
}
const unsigned &rayID = RTCRayN_id(ray, N, i);
const unsigned &geomID = RTCHitN_geomID(potentialHit, N, i);
const unsigned &primID = RTCHitN_primID(potentialHit, N, i);
// unpack ray index
const unsigned rayIndex = rayID;
const modelinfo_t *source_modelinfo = rsi->self;
const modelinfo_t *hit_modelinfo = Embree_LookupModelinfo(geomID, primID);
if (!hit_modelinfo) {
// we hit a "skip" face with no associated model
// reject hit (???)
valid[i] = INVALID;
continue;
}
if (hit_modelinfo->shadowworldonly.boolValue()) {
// we hit "_shadowworldonly" "1" geometry. Ignore the hit unless we are from world.
if (!source_modelinfo || !source_modelinfo->isWorld()) {
// reject hit
valid[i] = INVALID;
continue;
}
}
if (hit_modelinfo->shadowself.boolValue()) {
// only casts shadows on itself
if (source_modelinfo != hit_modelinfo) {
// reject hit
valid[i] = INVALID;
continue;
}
}
if (hit_modelinfo->switchableshadow.boolValue()) {
// we hit a dynamic shadow caster. reject the hit, but store the
// info about what we hit.
const int style = hit_modelinfo->switchshadstyle.intValue();
AddDynamicOccluderToRay(context, rayIndex, style);
// reject hit
valid[i] = INVALID;
continue;
}
// test fence textures and glass
const bsp2_dface_t *face = Embree_LookupFace(geomID, primID);
float alpha = Face_Alpha(hit_modelinfo, face);
//mxd
bool isFence, isGlass;
if(bsp_static->loadversion == Q2_BSPVERSION) {
const int contents = Face_Contents(bsp_static, face);
isFence = ((contents & Q2_SURF_TRANSLUCENT) == Q2_SURF_TRANSLUCENT); // KMQuake 2-specific. Use texture alpha chanel when both flags are set.
isGlass = !isFence && (contents & Q2_SURF_TRANSLUCENT);
if(isGlass)
alpha = (contents & Q2_SURF_TRANS33 ? 0.66f : 0.33f);
} else {
const char *name = Face_TextureName(bsp_static, face);
isFence = (name[0] == '{');
isGlass = (alpha < 1.0f);
}
if (isFence || isGlass) {
vec3_t hitpoint;
Embree_RayEndpoint(ray, N, i, hitpoint);
const color_rgba sample = SampleTexture(face, bsp_static, hitpoint); //mxd. Palette index -> color_rgba
if (isGlass) {
// hit glass...
//mxd. Adjust alpha by texture alpha?
if (sample.a < 255)
alpha = sample.a / 255.0f;
vec3_t rayDir = {
RTCRayN_dir_x(ray, N, i),
RTCRayN_dir_y(ray, N, i),
RTCRayN_dir_z(ray, N, i)
};
vec3_t potentialHitGeometryNormal = {
RTCHitN_Ng_x(potentialHit, N, i),
RTCHitN_Ng_y(potentialHit, N, i),
RTCHitN_Ng_z(potentialHit, N, i)
};
VectorNormalize(rayDir);
VectorNormalize(potentialHitGeometryNormal);
const vec_t raySurfaceCosAngle = DotProduct(rayDir, potentialHitGeometryNormal);
// only pick up the color of the glass on the _exiting_ side of the glass.
// (we currently trace "backwards", from surface point --> light source)
if (raySurfaceCosAngle < 0) {
vec3_t samplecolor { (float)sample.r, (float)sample.g, (float)sample.b };
VectorScale(samplecolor, 1/255.0f, samplecolor);
AddGlassToRay(context, rayIndex, alpha, samplecolor);
}
// reject hit
valid[i] = INVALID;
continue;
}
if (isFence) {
if (sample.a < 255) {
// reject hit
valid[i] = INVALID;
continue;
}
}
}
// accept hit
// (just need to leave the `valid` value set to VALID)
}
}
// building faces for skip-textured bmodels
#if 0
static FILE *
InitObjFile(const char *filename)
{
FILE *objfile;
char objfilename[1024];
strcpy(objfilename, filename);
StripExtension(objfilename);
DefaultExtension(objfilename, ".obj");
objfile = fopen(objfilename, "wt");
if (!objfile)
Error("Failed to open %s: %s", objfilename, strerror(errno));
return objfile;
}
static void
ExportObjFace(FILE *f, const winding_t *winding, int *vertcount)
{
// plane_t plane;
// WindingPlane(winding, plane.normal, &plane.dist);
// export the vertices and uvs
for (int i=0; i<winding->numpoints; i++)
{
fprintf(f, "v %.9g %.9g %.9g\n", winding->p[i][0], winding->p[i][1], winding->p[i][2]);
// fprintf(f, "vn %.9g %.9g %.9g\n", plane.normal[0], plane.normal[1], plane.normal[2]);
}
fprintf(f, "f");
for (int i=0; i<winding->numpoints; i++) {
// .obj vertexes start from 1
// .obj faces are CCW, quake is CW, so reverse the order
const int vertindex = *vertcount + (winding->numpoints - 1 - i) + 1;
fprintf(f, " %d//%d", vertindex, vertindex);
}
fprintf(f, "\n");
*vertcount += winding->numpoints;
}
static void
ExportObj(const char *filename, const vector<winding_t *> &windings)
{
FILE *objfile = InitObjFile(filename);
int vertcount = 0;
for (const auto &winding : windings) {
ExportObjFace(objfile, winding, &vertcount);
}
fclose(objfile);
}
#endif
plane_t Node_Plane(const mbsp_t *bsp, const bsp2_dnode_t *node, bool side)
{
const dplane_t *dplane = &bsp->dplanes[node->planenum];
plane_t plane;
VectorCopy(dplane->normal, plane.normal);
plane.dist = dplane->dist;
if (side) {
VectorScale(plane.normal, -1, plane.normal);
plane.dist *= -1.0f;
}
return plane;
}
/**
* `planes` all of the node planes that bound this leaf, facing inward.
*/
std::vector<winding_t *>
Leaf_MakeFaces(const mbsp_t *bsp, const mleaf_t *leaf, const std::vector<plane_t> &planes)
{
std::vector<winding_t *> result;
for (const plane_t &plane : planes) {
// flip the inward-facing split plane to get the outward-facing plane of the face we're constructing
plane_t faceplane;
VectorScale(plane.normal, -1, faceplane.normal);
faceplane.dist = -plane.dist;
winding_t *winding = BaseWindingForPlane(faceplane.normal, faceplane.dist);
// clip `winding` by all of the other planes
for (const plane_t &plane2 : planes) {
if (&plane2 == &plane)
continue;
winding_t *front = nullptr;
winding_t *back = nullptr;
// frees winding.
ClipWinding(winding, plane2.normal, plane2.dist, &front, &back);
// discard the back, continue clipping the front part
free(back);
winding = front;
// check if everything was clipped away
if (winding == nullptr)
break;
}
if (winding == nullptr) {
//logprint("WARNING: winding clipped away\n");
} else {
result.push_back(winding);
}
}
return result;
}
void FreeWindings(std::vector<winding_t *> &windings)
{
for (winding_t *winding : windings) {
free(winding);
}
windings.clear();
}
void
MakeFaces_r(const mbsp_t *bsp, const int nodenum, std::vector<plane_t> *planes, std::vector<winding_t *> *result)
{
if (nodenum < 0) {
const int leafnum = -nodenum - 1;
const mleaf_t *leaf = &bsp->dleafs[leafnum];
if (bsp->loadversion == Q2_BSPVERSION ? leaf->contents & Q2_CONTENTS_SOLID : leaf->contents == CONTENTS_SOLID) {
std::vector<winding_t *> leaf_windings = Leaf_MakeFaces(bsp, leaf, *planes);
for (winding_t *w : leaf_windings) {
result->push_back(w);
}
}
return;
}
const bsp2_dnode_t *node = &bsp->dnodes[nodenum];
// go down the front side
const plane_t front = Node_Plane(bsp, node, false);
planes->push_back(front);
MakeFaces_r(bsp, node->children[0], planes, result);
planes->pop_back();
// go down the back side
const plane_t back = Node_Plane(bsp, node, true);
planes->push_back(back);
MakeFaces_r(bsp, node->children[1], planes, result);
planes->pop_back();
}
std::vector<winding_t *>
MakeFaces(const mbsp_t *bsp, const dmodel_t *model)
{
std::vector<winding_t *> result;
std::vector<plane_t> planes;
MakeFaces_r(bsp, model->headnode[0], &planes, &result);
Q_assert(planes.empty());
return result;
}
void
Embree_TraceInit(const mbsp_t *bsp)
{
bsp_static = bsp;
Q_assert(device == nullptr);
std::vector<const bsp2_dface_t *> skyfaces, solidfaces, filterfaces;
// check all modelinfos
for (int mi = 0; mi<bsp->nummodels; mi++) {
const modelinfo_t *model = ModelInfoForModel(bsp, mi);
const bool isWorld = model->isWorld();
const bool shadow = model->shadow.boolValue();
const bool shadowself = model->shadowself.boolValue();
const bool shadowworldonly = model->shadowworldonly.boolValue();
const bool switchableshadow = model->switchableshadow.boolValue();
if (!(isWorld || shadow || shadowself || shadowworldonly || switchableshadow))
continue;
for (int i=0; i<model->model->numfaces; i++) {
const bsp2_dface_t *face = BSP_GetFace(bsp, model->model->firstface + i);
// check for TEX_NOSHADOW
const uint64_t extended_flags = extended_texinfo_flags[face->texinfo];
if (extended_flags & TEX_NOSHADOW)
continue;
// handle switchableshadow
if (switchableshadow) {
filterfaces.push_back(face);
continue;
}
const int contents = Face_Contents(bsp, face); //mxd
const gtexinfo_t *texinfo = Face_Texinfo(bsp, face);
//mxd. Skip NODRAW faces, but not SKY ones (Q2's sky01.wal has both flags set)
if(bsp->loadversion == Q2_BSPVERSION && (contents & Q2_SURF_NODRAW) && !(contents & Q2_SURF_SKY))
continue;
// handle glass / water
const float alpha = Face_Alpha(model, face);
if (alpha < 1.0f
|| (bsp->loadversion == Q2_BSPVERSION && (contents & Q2_SURF_TRANSLUCENT))) { //mxd. Both fence and transparent textures are done using SURF_TRANS flags in Q2
filterfaces.push_back(face);
continue;
}
// fence
const char *texname = Face_TextureName(bsp, face);
if (texname[0] == '{') {
filterfaces.push_back(face);
continue;
}
// handle sky
if (bsp->loadversion == Q2_BSPVERSION) {
// Q2: arghrad compat: sky faces only emit sunlight if:
// sky flag set, light flag set, value nonzero
if ((contents & Q2_SURF_SKY) != 0
&& (contents & Q2_SURF_LIGHT) != 0
&& texinfo->value != 0)
{
skyfaces.push_back(face);
continue;
}
} else {
// Q1
if (!Q_strncasecmp("sky", texname, 3)) {
skyfaces.push_back(face);
continue;
}
}
// liquids
if (/* texname[0] == '*' */ Contents_IsTranslucent(bsp, contents)) { //mxd
if (!isWorld) {
// world liquids never cast shadows; shadow casting bmodel liquids do
solidfaces.push_back(face);
}
continue;
}
// solid faces
if (isWorld || shadow){
solidfaces.push_back(face);
} else {
// shadowself or shadowworldonly
Q_assert(shadowself || shadowworldonly);
filterfaces.push_back(face);
}
}
}
/* Special handling of skip-textured bmodels */
std::vector<winding_t *> skipwindings;
for (const modelinfo_t *model : tracelist) {
if (model->model->numfaces == 0) {
std::vector<winding_t *> windings = MakeFaces(bsp, model->model);
for (auto &w : windings) {
skipwindings.push_back(w);
}
}
}
device = rtcNewDevice (NULL);
rtcSetDeviceErrorFunction(device,ErrorCallback,nullptr); //mxd. Changed from rtcDeviceSetErrorFunction to silence compiler warning...
// log version
const size_t ver_maj = rtcGetDeviceProperty (device,RTC_DEVICE_PROPERTY_VERSION_MAJOR);
const size_t ver_min = rtcGetDeviceProperty (device,RTC_DEVICE_PROPERTY_VERSION_MINOR);
const size_t ver_pat = rtcGetDeviceProperty (device,RTC_DEVICE_PROPERTY_VERSION_PATCH);
logprint("Embree_TraceInit: Embree version: %d.%d.%d\n",
static_cast<int>(ver_maj), static_cast<int>(ver_min), static_cast<int>(ver_pat));
scene = rtcNewScene(device);
rtcSetSceneFlags(scene,RTC_SCENE_FLAG_NONE);
rtcSetSceneBuildQuality(scene,RTC_BUILD_QUALITY_HIGH);
skygeom = CreateGeometry(bsp, device, scene, skyfaces);
solidgeom = CreateGeometry(bsp, device, scene, solidfaces);
filtergeom = CreateGeometry(bsp, device, scene, filterfaces);
CreateGeometryFromWindings(device, scene, skipwindings);
rtcSetGeometryIntersectFilterFunction(rtcGetGeometry(scene,filtergeom.geomID),Embree_FilterFuncN<filtertype_t::INTERSECTION>);
rtcSetGeometryOccludedFilterFunction(rtcGetGeometry(scene,filtergeom.geomID),Embree_FilterFuncN<filtertype_t::OCCLUSION>);
rtcCommitScene(scene);
logprint("Embree_TraceInit:\n");
logprint("\t%d sky faces\n", (int)skyfaces.size());
logprint("\t%d solid faces\n", (int)solidfaces.size());
logprint("\t%d filtered faces\n", (int)filterfaces.size());
logprint("\t%d shadow-casting skip faces\n", (int)skipwindings.size());
FreeWindings(skipwindings);
}
static RTCRayHit SetupRay(unsigned rayindex, const vec3_t start, const vec3_t dir, vec_t dist)
{
RTCRayHit ray;
ray.ray.org_x = start[0];
ray.ray.org_y = start[1];
ray.ray.org_z = start[2];
ray.ray.tnear = 0.f;
ray.ray.dir_x = dir[0]; // can be un-normalized
ray.ray.dir_y = dir[1];
ray.ray.dir_z = dir[2];
ray.ray.time = 0.f; // not using
ray.ray.tfar = dist;
ray.ray.mask = 0; // not using
ray.ray.id = rayindex;
ray.ray.flags = 0; // reserved
ray.hit.geomID = RTC_INVALID_GEOMETRY_ID;
ray.hit.primID = RTC_INVALID_GEOMETRY_ID;
ray.hit.instID[0] = RTC_INVALID_GEOMETRY_ID;
return ray;
}
static RTCRayHit SetupRay_StartStop(const vec3_t start, const vec3_t stop)
{
vec3_t dir;
VectorSubtract(stop, start, dir);
vec_t dist = VectorNormalize(dir);
return SetupRay(0, start, dir, dist);
}
//public
hitresult_t Embree_TestLight(const vec3_t start, const vec3_t stop, const modelinfo_t *self)
{
RTCRay ray = SetupRay_StartStop(start, stop).ray;
ray_source_info ctx2(nullptr, self);
rtcOccluded1(scene, &ctx2,&ray);
if (ray.tfar < 0.0f)
return {false, 0}; //fully occluded
// no obstruction (or a switchable shadow obstruction only)
return {true, ctx2.singleRayShadowStyle};
}
//public
hitresult_t Embree_TestSky(const vec3_t start, const vec3_t dirn, const modelinfo_t *self, const bsp2_dface_t **face_out)
{
// trace from the sample point towards the sun, and
// return true if we hit a sky poly.
vec3_t dir_normalized;
VectorCopy(dirn, dir_normalized);
VectorNormalize(dir_normalized);
RTCRayHit ray = SetupRay(0, start, dir_normalized, MAX_SKY_DIST);
ray_source_info ctx2(nullptr, self);
rtcIntersect1(scene, &ctx2,&ray);
qboolean hit_sky = (ray.hit.geomID == skygeom.geomID);
if (face_out) {
if (hit_sky) {
const sceneinfo &si = Embree_SceneinfoForGeomID(ray.hit.geomID);
*face_out = si.triToFace.at(ray.hit.primID);
} else {
*face_out = nullptr;
}
}
return {hit_sky, ctx2.singleRayShadowStyle};
}
//public
hittype_t Embree_DirtTrace(const vec3_t start, const vec3_t dirn, vec_t dist, const modelinfo_t *self, vec_t *hitdist_out, plane_t *hitplane_out, const bsp2_dface_t **face_out)
{
RTCRayHit ray = SetupRay(0, start, dirn, dist);
ray_source_info ctx2(nullptr, self);
rtcIntersect1(scene, &ctx2,&ray);
ray.hit.Ng_x = -ray.hit.Ng_x;
ray.hit.Ng_y = -ray.hit.Ng_y;
ray.hit.Ng_z = -ray.hit.Ng_z;
if (ray.hit.geomID == RTC_INVALID_GEOMETRY_ID)
return hittype_t::NONE;
if (hitdist_out) {
*hitdist_out = ray.ray.tfar;
}
if (hitplane_out) {
hitplane_out->normal[0] = ray.hit.Ng_x;
hitplane_out->normal[1] = ray.hit.Ng_y;
hitplane_out->normal[2] = ray.hit.Ng_z;
VectorNormalize(hitplane_out->normal);
vec3_t hitpoint;
VectorMA(start, ray.ray.tfar, dirn, hitpoint);
hitplane_out->dist = DotProduct(hitplane_out->normal, hitpoint);
}
if (face_out) {
const sceneinfo &si = Embree_SceneinfoForGeomID(ray.hit.geomID);
*face_out = si.triToFace.at(ray.hit.primID);
}
if (ray.hit.geomID == skygeom.geomID) {
return hittype_t::SKY;
} else {
return hittype_t::SOLID;
}
}
//enum class streamstate_t {
// READY, DID_OCCLUDE, DID_INTERSECT
//};
static void *q_aligned_malloc(size_t align, size_t size)
{
#ifdef _MSC_VER
return _aligned_malloc(size, align);
#else
void *ptr;
if (0 != posix_memalign(&ptr, align, size)) {
return nullptr;
}
return ptr;
#endif
}
static void q_aligned_free(void *ptr)
{
#ifdef _MSC_VER
_aligned_free(ptr);
#else
free(ptr);
#endif
}
class raystream_embree_common_t : public virtual raystream_common_t {
public:
float *_rays_maxdist;
int *_point_indices;
vec3_t *_ray_colors;
vec3_t *_ray_normalcontribs;
// This is set to the modelinfo's switchshadstyle if the ray hit
// a dynamic shadow caster. (note that for rays that hit dynamic
// shadow casters, all of the other hit data is assuming the ray went
// straight through).
int *_ray_dynamic_styles;
int _numrays;
int _maxrays;
// streamstate_t _state;
public:
raystream_embree_common_t(int maxRays) :
_rays_maxdist { new float[maxRays] },
_point_indices { new int[maxRays] },
_ray_colors { static_cast<vec3_t *>(calloc(maxRays, sizeof(vec3_t))) },
_ray_normalcontribs { static_cast<vec3_t *>(calloc(maxRays, sizeof(vec3_t))) },
_ray_dynamic_styles { new int[maxRays] },
_numrays { 0 },
_maxrays { maxRays } {}
//,
//_state { streamstate_t::READY } {}
~raystream_embree_common_t() {
delete[] _rays_maxdist;
delete[] _point_indices;
free(_ray_colors);
free(_ray_normalcontribs);
delete[] _ray_dynamic_styles;
}
size_t numPushedRays() override {
return _numrays;
}
int getPushedRayPointIndex(size_t j) override {
// Q_assert(_state != streamstate_t::READY);
Q_assert(j < _maxrays);
return _point_indices[j];
}
void getPushedRayColor(size_t j, vec3_t out) override {
Q_assert(j < _maxrays);
VectorCopy(_ray_colors[j], out);
}
void getPushedRayNormalContrib(size_t j, vec3_t out) override {
Q_assert(j < _maxrays);
VectorCopy(_ray_normalcontribs[j], out);
}
int getPushedRayDynamicStyle(size_t j) override {
Q_assert(j < _maxrays);
return _ray_dynamic_styles[j];
}
void clearPushedRays() override {
_numrays = 0;
//_state = streamstate_t::READY;
}
};
class raystream_embree_intersection_t : public raystream_embree_common_t, public raystream_intersection_t {
public:
RTCRayHit *_rays;
public:
raystream_embree_intersection_t(int maxRays) :
raystream_embree_common_t(maxRays),
_rays { static_cast<RTCRayHit *>(q_aligned_malloc(16, sizeof(RTCRayHit) * maxRays)) }
{}
~raystream_embree_intersection_t() {
q_aligned_free(_rays);
}
void pushRay(int i, const vec_t *origin, const vec3_t dir, float dist, const vec_t *color = nullptr, const vec_t *normalcontrib = nullptr) override {
Q_assert(_numrays<_maxrays);
const RTCRayHit rayHit = SetupRay(_numrays, origin, dir, dist);
_rays[_numrays] = rayHit;
_rays_maxdist[_numrays] = dist;
_point_indices[_numrays] = i;
if (color) {
VectorCopy(color, _ray_colors[_numrays]);
}
if (normalcontrib) {
VectorCopy(normalcontrib, _ray_normalcontribs[_numrays]);
}
_ray_dynamic_styles[_numrays] = 0;
_numrays++;
}
void tracePushedRaysIntersection(const modelinfo_t *self) override {
if (!_numrays)
return;
ray_source_info ctx2(this, self);
rtcIntersect1M(scene, &ctx2, _rays, _numrays, sizeof(_rays[0]));
}
void getPushedRayDir(size_t j, vec3_t out) override {
Q_assert(j < _maxrays);
out[0] = _rays[j].ray.dir_x;
out[1] = _rays[j].ray.dir_y;
out[2] = _rays[j].ray.dir_z;
}
float getPushedRayHitDist(size_t j) override {
Q_assert(j < _maxrays);
return _rays[j].ray.tfar;
}
hittype_t getPushedRayHitType(size_t j) override {
Q_assert(j < _maxrays);
const unsigned id = _rays[j].hit.geomID;
if (id == RTC_INVALID_GEOMETRY_ID) {
return hittype_t::NONE;
} else if (id == skygeom.geomID) {
return hittype_t::SKY;
} else {
return hittype_t::SOLID;
}
}
const bsp2_dface_t *getPushedRayHitFace(size_t j) override {
Q_assert(j < _maxrays);
const RTCRayHit &ray = _rays[j];
if (ray.hit.geomID == RTC_INVALID_GEOMETRY_ID)
return nullptr;
const sceneinfo &si = Embree_SceneinfoForGeomID(ray.hit.geomID);
const bsp2_dface_t *face = si.triToFace.at(ray.hit.primID);
Q_assert(face != nullptr);
return face;
}
};
class raystream_embree_occlusion_t : public raystream_embree_common_t, public raystream_occlusion_t {
public:
RTCRay *_rays;
public:
raystream_embree_occlusion_t(int maxRays) :
raystream_embree_common_t(maxRays),
_rays { static_cast<RTCRay *>(q_aligned_malloc(16, sizeof(RTCRay) * maxRays)) }
{}
~raystream_embree_occlusion_t() {
q_aligned_free(_rays);
}
void pushRay(int i, const vec_t *origin, const vec3_t dir, float dist, const vec_t *color = nullptr, const vec_t *normalcontrib = nullptr) override {
Q_assert(_numrays<_maxrays);
_rays[_numrays] = SetupRay(_numrays, origin, dir, dist).ray;
_rays_maxdist[_numrays] = dist;
_point_indices[_numrays] = i;
if (color) {
VectorCopy(color, _ray_colors[_numrays]);
}
if (normalcontrib) {
VectorCopy(normalcontrib, _ray_normalcontribs[_numrays]);
}
_ray_dynamic_styles[_numrays] = 0;
_numrays++;
}
void tracePushedRaysOcclusion(const modelinfo_t *self) override {
//Q_assert(_state == streamstate_t::READY);
if (!_numrays)
return;
ray_source_info ctx2(this, self);
rtcOccluded1M(scene, &ctx2, _rays, _numrays, sizeof(_rays[0]));
}
bool getPushedRayOccluded(size_t j) override {
Q_assert(j < _maxrays);
return (_rays[j].tfar < 0.0f);
}
void getPushedRayDir(size_t j, vec3_t out) override {
Q_assert(j < _maxrays);
out[0] = _rays[j].dir_x;
out[1] = _rays[j].dir_y;
out[2] = _rays[j].dir_z;
}
};
raystream_occlusion_t *Embree_MakeOcclusionRayStream(int maxrays)
{
return new raystream_embree_occlusion_t{maxrays};
}
raystream_intersection_t *Embree_MakeIntersectionRayStream(int maxrays)
{
return new raystream_embree_intersection_t{maxrays};
}
void AddGlassToRay(RTCIntersectContext* context, unsigned rayIndex, float opacity, const vec3_t glasscolor) {
ray_source_info *ctx = static_cast<ray_source_info *>(context);
raystream_embree_common_t *rs = ctx->raystream;
if (rs == nullptr) {
// FIXME: remove this.. once all ray casts use raystreams
// happens for bounce lights, e.g. Embree_TestSky
return;
}
// clamp opacity
opacity = qmin(qmax(0.0f, opacity), 1.0f);
Q_assert(rayIndex < rs->_numrays);
Q_assert(glasscolor[0] >= 0.0 && glasscolor[0] <= 1.0);
Q_assert(glasscolor[1] >= 0.0 && glasscolor[1] <= 1.0);
Q_assert(glasscolor[2] >= 0.0 && glasscolor[2] <= 1.0);
//multiply ray color by glass color
vec3_t tinted;
for (int i=0; i<3; i++) {
tinted[i] = rs->_ray_colors[rayIndex][i] * glasscolor[i];
}
// lerp between original ray color and fully tinted, based on opacity
vec3_t lerped = {0.0, 0.0, 0.0};
VectorMA(lerped, opacity, tinted, lerped);
VectorMA(lerped, 1.0-opacity, rs->_ray_colors[rayIndex], lerped);
// use the lerped color, scaled by (1-opacity) as the new ray color
// VectorScale(lerped, (1.0f - opacity), rs->_ray_colors[rayIndex]);
// use the lerped color
VectorCopy(lerped, rs->_ray_colors[rayIndex]);
}
void AddDynamicOccluderToRay(RTCIntersectContext* context, unsigned rayIndex, int style)
{
ray_source_info *ctx = static_cast<ray_source_info *>(context);
raystream_embree_common_t *rs = ctx->raystream;
if (rs != nullptr) {
rs->_ray_dynamic_styles[rayIndex] = style;
} else {
// TestLight case
ctx->singleRayShadowStyle = style;
}
}
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