+void R_Shadow_UpdateBounceGridTexture(void)
+{
+#define MAXBOUNCEGRIDPARTICLESPERLIGHT 1048576
+ dlight_t *light;
+ int flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
+ int bouncecount;
+ int hitsupercontentsmask;
+ int maxbounce;
+ int numpixels;
+ int resolution[3];
+ int shootparticles;
+ int shotparticles;
+ int photoncount;
+ int tex[3];
+ trace_t cliptrace;
+ //trace_t cliptrace2;
+ //trace_t cliptrace3;
+ unsigned char *pixel;
+ unsigned char *pixels;
+ float *highpixel;
+ float *highpixels;
+ unsigned int lightindex;
+ unsigned int range;
+ unsigned int range1;
+ unsigned int range2;
+ unsigned int seed = (unsigned int)(realtime * 1000.0f);
+ vec3_t shotcolor;
+ vec3_t baseshotcolor;
+ vec3_t surfcolor;
+ vec3_t clipend;
+ vec3_t clipstart;
+ vec3_t clipdiff;
+ vec3_t ispacing;
+ vec3_t maxs;
+ vec3_t mins;
+ vec3_t size;
+ vec3_t spacing;
+ vec3_t lightcolor;
+ vec3_t steppos;
+ vec3_t stepdelta;
+ vec3_t cullmins, cullmaxs;
+ vec_t radius;
+ vec_t s;
+ vec_t lightintensity;
+ vec_t photonscaling;
+ vec_t photonresidual;
+ float m[16];
+ float texlerp[2][3];
+ float splatcolor[32];
+ float pixelweight[8];
+ float w;
+ int c[4];
+ int pixelindex[8];
+ int corner;
+ int pixelsperband;
+ int pixelband;
+ int pixelbands;
+ int numsteps;
+ int step;
+ int x, y, z;
+ rtlight_t *rtlight;
+ r_shadow_bouncegrid_settings_t settings;
+ qboolean enable = r_shadow_bouncegrid.integer != 0 && r_refdef.scene.worldmodel;
+ qboolean allowdirectionalshading = false;
+ switch(vid.renderpath)
+ {
+ case RENDERPATH_GL20:
+ allowdirectionalshading = true;
+ if (!vid.support.ext_texture_3d)
+ return;
+ break;
+ case RENDERPATH_GLES2:
+ // for performance reasons, do not use directional shading on GLES devices
+ if (!vid.support.ext_texture_3d)
+ return;
+ break;
+ // these renderpaths do not currently have the code to display the bouncegrid, so disable it on them...
+ case RENDERPATH_GL11:
+ case RENDERPATH_GL13:
+ case RENDERPATH_GLES1:
+ case RENDERPATH_SOFT:
+ case RENDERPATH_D3D9:
+ case RENDERPATH_D3D10:
+ case RENDERPATH_D3D11:
+ return;
+ }
+
+ r_shadow_bouncegridintensity = r_shadow_bouncegrid_intensity.value;
+
+ // see if there are really any lights to render...
+ if (enable && r_shadow_bouncegrid_static.integer)
+ {
+ enable = false;
+ range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
+ for (lightindex = 0;lightindex < range;lightindex++)
+ {
+ light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
+ if (!light || !(light->flags & flag))
+ continue;
+ rtlight = &light->rtlight;
+ // when static, we skip styled lights because they tend to change...
+ if (rtlight->style > 0)
+ continue;
+ VectorScale(rtlight->color, (rtlight->ambientscale + rtlight->diffusescale + rtlight->specularscale), lightcolor);
+ if (!VectorLength2(lightcolor))
+ continue;
+ enable = true;
+ break;
+ }
+ }
+
+ if (!enable)
+ {
+ if (r_shadow_bouncegridtexture)
+ {
+ R_FreeTexture(r_shadow_bouncegridtexture);
+ r_shadow_bouncegridtexture = NULL;
+ }
+ if (r_shadow_bouncegridpixels)
+ Mem_Free(r_shadow_bouncegridpixels);
+ r_shadow_bouncegridpixels = NULL;
+ if (r_shadow_bouncegridhighpixels)
+ Mem_Free(r_shadow_bouncegridhighpixels);
+ r_shadow_bouncegridhighpixels = NULL;
+ r_shadow_bouncegridnumpixels = 0;
+ r_shadow_bouncegriddirectional = false;
+ return;
+ }
+
+ // build up a complete collection of the desired settings, so that memcmp can be used to compare parameters
+ memset(&settings, 0, sizeof(settings));
+ settings.staticmode = r_shadow_bouncegrid_static.integer != 0;
+ settings.bounceanglediffuse = r_shadow_bouncegrid_bounceanglediffuse.integer != 0;
+ settings.directionalshading = (r_shadow_bouncegrid_static.integer != 0 ? r_shadow_bouncegrid_static_directionalshading.integer != 0 : r_shadow_bouncegrid_directionalshading.integer != 0) && allowdirectionalshading;
+ settings.dlightparticlemultiplier = r_shadow_bouncegrid_dlightparticlemultiplier.value;
+ settings.hitmodels = r_shadow_bouncegrid_hitmodels.integer != 0;
+ settings.includedirectlighting = r_shadow_bouncegrid_includedirectlighting.integer != 0 || r_shadow_bouncegrid.integer == 2;
+ settings.lightradiusscale = (r_shadow_bouncegrid_static.integer != 0 ? r_shadow_bouncegrid_static_lightradiusscale.value : r_shadow_bouncegrid_lightradiusscale.value);
+ settings.maxbounce = (r_shadow_bouncegrid_static.integer != 0 ? r_shadow_bouncegrid_static_maxbounce.integer : r_shadow_bouncegrid_maxbounce.integer);
+ settings.particlebounceintensity = r_shadow_bouncegrid_particlebounceintensity.value;
+ settings.particleintensity = r_shadow_bouncegrid_particleintensity.value * 16384.0f * (settings.directionalshading ? 4.0f : 1.0f) / (r_shadow_bouncegrid_spacing.value * r_shadow_bouncegrid_spacing.value);
+ settings.photons = r_shadow_bouncegrid_static.integer ? r_shadow_bouncegrid_static_photons.integer : r_shadow_bouncegrid_photons.integer;
+ settings.spacing[0] = r_shadow_bouncegrid_spacing.value;
+ settings.spacing[1] = r_shadow_bouncegrid_spacing.value;
+ settings.spacing[2] = r_shadow_bouncegrid_spacing.value;
+ settings.stablerandom = r_shadow_bouncegrid_stablerandom.integer;
+
+ // bound the values for sanity
+ settings.photons = bound(1, settings.photons, 1048576);
+ settings.lightradiusscale = bound(0.0001f, settings.lightradiusscale, 1024.0f);
+ settings.maxbounce = bound(0, settings.maxbounce, 16);
+ settings.spacing[0] = bound(1, settings.spacing[0], 512);
+ settings.spacing[1] = bound(1, settings.spacing[1], 512);
+ settings.spacing[2] = bound(1, settings.spacing[2], 512);
+
+ // get the spacing values
+ spacing[0] = settings.spacing[0];
+ spacing[1] = settings.spacing[1];
+ spacing[2] = settings.spacing[2];
+ ispacing[0] = 1.0f / spacing[0];
+ ispacing[1] = 1.0f / spacing[1];
+ ispacing[2] = 1.0f / spacing[2];
+
+ // calculate texture size enclosing entire world bounds at the spacing
+ VectorMA(r_refdef.scene.worldmodel->normalmins, -2.0f, spacing, mins);
+ VectorMA(r_refdef.scene.worldmodel->normalmaxs, 2.0f, spacing, maxs);
+ VectorSubtract(maxs, mins, size);
+ // now we can calculate the resolution we want
+ c[0] = (int)floor(size[0] / spacing[0] + 0.5f);
+ c[1] = (int)floor(size[1] / spacing[1] + 0.5f);
+ c[2] = (int)floor(size[2] / spacing[2] + 0.5f);
+ // figure out the exact texture size (honoring power of 2 if required)
+ c[0] = bound(4, c[0], (int)vid.maxtexturesize_3d);
+ c[1] = bound(4, c[1], (int)vid.maxtexturesize_3d);
+ c[2] = bound(4, c[2], (int)vid.maxtexturesize_3d);
+ if (vid.support.arb_texture_non_power_of_two)
+ {
+ resolution[0] = c[0];
+ resolution[1] = c[1];
+ resolution[2] = c[2];
+ }
+ else
+ {
+ for (resolution[0] = 4;resolution[0] < c[0];resolution[0]*=2) ;
+ for (resolution[1] = 4;resolution[1] < c[1];resolution[1]*=2) ;
+ for (resolution[2] = 4;resolution[2] < c[2];resolution[2]*=2) ;
+ }
+ size[0] = spacing[0] * resolution[0];
+ size[1] = spacing[1] * resolution[1];
+ size[2] = spacing[2] * resolution[2];
+
+ // if dynamic we may or may not want to use the world bounds
+ // if the dynamic size is smaller than the world bounds, use it instead
+ if (!settings.staticmode && (r_shadow_bouncegrid_x.integer * r_shadow_bouncegrid_y.integer * r_shadow_bouncegrid_z.integer < resolution[0] * resolution[1] * resolution[2]))
+ {
+ // we know the resolution we want
+ c[0] = r_shadow_bouncegrid_x.integer;
+ c[1] = r_shadow_bouncegrid_y.integer;
+ c[2] = r_shadow_bouncegrid_z.integer;
+ // now we can calculate the texture size (power of 2 if required)
+ c[0] = bound(4, c[0], (int)vid.maxtexturesize_3d);
+ c[1] = bound(4, c[1], (int)vid.maxtexturesize_3d);
+ c[2] = bound(4, c[2], (int)vid.maxtexturesize_3d);
+ if (vid.support.arb_texture_non_power_of_two)
+ {
+ resolution[0] = c[0];
+ resolution[1] = c[1];
+ resolution[2] = c[2];
+ }
+ else
+ {
+ for (resolution[0] = 4;resolution[0] < c[0];resolution[0]*=2) ;
+ for (resolution[1] = 4;resolution[1] < c[1];resolution[1]*=2) ;
+ for (resolution[2] = 4;resolution[2] < c[2];resolution[2]*=2) ;
+ }
+ size[0] = spacing[0] * resolution[0];
+ size[1] = spacing[1] * resolution[1];
+ size[2] = spacing[2] * resolution[2];
+ // center the rendering on the view
+ mins[0] = floor(r_refdef.view.origin[0] * ispacing[0] + 0.5f) * spacing[0] - 0.5f * size[0];
+ mins[1] = floor(r_refdef.view.origin[1] * ispacing[1] + 0.5f) * spacing[1] - 0.5f * size[1];
+ mins[2] = floor(r_refdef.view.origin[2] * ispacing[2] + 0.5f) * spacing[2] - 0.5f * size[2];
+ }
+
+ // recalculate the maxs in case the resolution was not satisfactory
+ VectorAdd(mins, size, maxs);
+
+ // if all the settings seem identical to the previous update, return
+ if (r_shadow_bouncegridtexture && (settings.staticmode || realtime < r_shadow_bouncegridtime + r_shadow_bouncegrid_updateinterval.value) && !memcmp(&r_shadow_bouncegridsettings, &settings, sizeof(settings)))
+ return;
+
+ // store the new settings
+ r_shadow_bouncegridsettings = settings;
+
+ pixelbands = settings.directionalshading ? 8 : 1;
+ pixelsperband = resolution[0]*resolution[1]*resolution[2];
+ numpixels = pixelsperband*pixelbands;
+
+ // we're going to update the bouncegrid, update the matrix...
+ memset(m, 0, sizeof(m));
+ m[0] = 1.0f / size[0];
+ m[3] = -mins[0] * m[0];
+ m[5] = 1.0f / size[1];
+ m[7] = -mins[1] * m[5];
+ m[10] = 1.0f / size[2];
+ m[11] = -mins[2] * m[10];
+ m[15] = 1.0f;
+ Matrix4x4_FromArrayFloatD3D(&r_shadow_bouncegridmatrix, m);
+ // reallocate pixels for this update if needed...
+ if (r_shadow_bouncegridnumpixels != numpixels || !r_shadow_bouncegridpixels || !r_shadow_bouncegridhighpixels)
+ {
+ if (r_shadow_bouncegridtexture)
+ {
+ R_FreeTexture(r_shadow_bouncegridtexture);
+ r_shadow_bouncegridtexture = NULL;
+ }
+ r_shadow_bouncegridpixels = (unsigned char *)Mem_Realloc(r_main_mempool, r_shadow_bouncegridpixels, numpixels * sizeof(unsigned char[4]));
+ r_shadow_bouncegridhighpixels = (float *)Mem_Realloc(r_main_mempool, r_shadow_bouncegridhighpixels, numpixels * sizeof(float[4]));
+ }
+ r_shadow_bouncegridnumpixels = numpixels;
+ pixels = r_shadow_bouncegridpixels;
+ highpixels = r_shadow_bouncegridhighpixels;
+ x = pixelsperband*4;
+ for (pixelband = 0;pixelband < pixelbands;pixelband++)
+ {
+ if (pixelband == 1)
+ memset(pixels + pixelband * x, 128, x);
+ else
+ memset(pixels + pixelband * x, 0, x);
+ }
+ memset(highpixels, 0, numpixels * sizeof(float[4]));
+ // figure out what we want to interact with
+ if (settings.hitmodels)
+ hitsupercontentsmask = SUPERCONTENTS_SOLID | SUPERCONTENTS_BODY;// | SUPERCONTENTS_LIQUIDSMASK;
+ else
+ hitsupercontentsmask = SUPERCONTENTS_SOLID;// | SUPERCONTENTS_LIQUIDSMASK;
+ maxbounce = settings.maxbounce;
+ // clear variables that produce warnings otherwise
+ memset(splatcolor, 0, sizeof(splatcolor));
+ // iterate world rtlights
+ range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
+ range1 = settings.staticmode ? 0 : r_refdef.scene.numlights;
+ range2 = range + range1;
+ photoncount = 0;
+ for (lightindex = 0;lightindex < range2;lightindex++)
+ {
+ if (lightindex < range)
+ {
+ light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
+ if (!light)
+ continue;
+ rtlight = &light->rtlight;
+ VectorClear(rtlight->photoncolor);
+ rtlight->photons = 0;
+ if (!(light->flags & flag))
+ continue;
+ if (settings.staticmode)
+ {
+ // when static, we skip styled lights because they tend to change...
+ if (rtlight->style > 0 && r_shadow_bouncegrid.integer != 2)
+ continue;
+ }
+ }
+ else
+ {
+ rtlight = r_refdef.scene.lights[lightindex - range];
+ VectorClear(rtlight->photoncolor);
+ rtlight->photons = 0;
+ }
+ // draw only visible lights (major speedup)
+ radius = rtlight->radius * settings.lightradiusscale;
+ cullmins[0] = rtlight->shadoworigin[0] - radius;
+ cullmins[1] = rtlight->shadoworigin[1] - radius;
+ cullmins[2] = rtlight->shadoworigin[2] - radius;
+ cullmaxs[0] = rtlight->shadoworigin[0] + radius;
+ cullmaxs[1] = rtlight->shadoworigin[1] + radius;
+ cullmaxs[2] = rtlight->shadoworigin[2] + radius;
+ if (R_CullBox(cullmins, cullmaxs))
+ continue;
+ if (r_refdef.scene.worldmodel
+ && r_refdef.scene.worldmodel->brush.BoxTouchingVisibleLeafs
+ && !r_refdef.scene.worldmodel->brush.BoxTouchingVisibleLeafs(r_refdef.scene.worldmodel, r_refdef.viewcache.world_leafvisible, cullmins, cullmaxs))
+ continue;
+ w = r_shadow_lightintensityscale.value * (rtlight->ambientscale + rtlight->diffusescale + rtlight->specularscale);
+ if (w * VectorLength2(rtlight->color) == 0.0f)
+ continue;
+ w *= (rtlight->style >= 0 ? r_refdef.scene.rtlightstylevalue[rtlight->style] : 1);
+ VectorScale(rtlight->color, w, rtlight->photoncolor);
+ //if (!VectorLength2(rtlight->photoncolor))
+ // continue;
+ // shoot particles from this light
+ // use a calculation for the number of particles that will not
+ // vary with lightstyle, otherwise we get randomized particle
+ // distribution, the seeded random is only consistent for a
+ // consistent number of particles on this light...
+ s = rtlight->radius;
+ lightintensity = VectorLength(rtlight->color) * (rtlight->ambientscale + rtlight->diffusescale + rtlight->specularscale);
+ if (lightindex >= range)
+ lightintensity *= settings.dlightparticlemultiplier;
+ rtlight->photons = max(0.0f, lightintensity * s * s);
+ photoncount += rtlight->photons;
+ }
+ photonscaling = (float)settings.photons / max(1, photoncount);
+ photonresidual = 0.0f;
+ for (lightindex = 0;lightindex < range2;lightindex++)
+ {
+ if (lightindex < range)
+ {
+ light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
+ if (!light)
+ continue;
+ rtlight = &light->rtlight;
+ }
+ else
+ rtlight = r_refdef.scene.lights[lightindex - range];
+ // skip a light with no photons
+ if (rtlight->photons == 0.0f)
+ continue;
+ // skip a light with no photon color)
+ if (VectorLength2(rtlight->photoncolor) == 0.0f)
+ continue;
+ photonresidual += rtlight->photons * photonscaling;
+ shootparticles = (int)bound(0, photonresidual, MAXBOUNCEGRIDPARTICLESPERLIGHT);
+ if (!shootparticles)
+ continue;
+ photonresidual -= shootparticles;
+ radius = rtlight->radius * settings.lightradiusscale;
+ s = settings.particleintensity / shootparticles;
+ VectorScale(rtlight->photoncolor, s, baseshotcolor);
+ r_refdef.stats.bouncegrid_lights++;
+ r_refdef.stats.bouncegrid_particles += shootparticles;
+ for (shotparticles = 0;shotparticles < shootparticles;shotparticles++)
+ {
+ if (settings.stablerandom > 0)
+ seed = lightindex * 11937 + shotparticles;
+ VectorCopy(baseshotcolor, shotcolor);
+ VectorCopy(rtlight->shadoworigin, clipstart);
+ if (settings.stablerandom < 0)
+ VectorRandom(clipend);
+ else
+ VectorCheeseRandom(clipend);
+ VectorMA(clipstart, radius, clipend, clipend);
+ for (bouncecount = 0;;bouncecount++)
+ {
+ r_refdef.stats.bouncegrid_traces++;
+ //r_refdef.scene.worldmodel->TraceLineAgainstSurfaces(r_refdef.scene.worldmodel, NULL, NULL, &cliptrace, clipstart, clipend, hitsupercontentsmask);
+ //r_refdef.scene.worldmodel->TraceLine(r_refdef.scene.worldmodel, NULL, NULL, &cliptrace2, clipstart, clipend, hitsupercontentsmask);
+ if (settings.staticmode)
+ {
+ // static mode fires a LOT of rays but none of them are identical, so they are not cached
+ cliptrace = CL_TraceLine(clipstart, clipend, settings.staticmode ? MOVE_WORLDONLY : (settings.hitmodels ? MOVE_HITMODEL : MOVE_NOMONSTERS), NULL, hitsupercontentsmask, true, false, NULL, true, true);
+ }
+ else
+ {
+ // dynamic mode fires many rays and most will match the cache from the previous frame
+ cliptrace = CL_Cache_TraceLineSurfaces(clipstart, clipend, settings.staticmode ? MOVE_WORLDONLY : (settings.hitmodels ? MOVE_HITMODEL : MOVE_NOMONSTERS), hitsupercontentsmask);
+ }
+ if (bouncecount > 0 || settings.includedirectlighting)
+ {
+ // calculate second order spherical harmonics values (average, slopeX, slopeY, slopeZ)
+ // accumulate average shotcolor
+ w = VectorLength(shotcolor);
+ splatcolor[ 0] = shotcolor[0];
+ splatcolor[ 1] = shotcolor[1];
+ splatcolor[ 2] = shotcolor[2];
+ splatcolor[ 3] = 0.0f;
+ if (pixelbands > 1)
+ {
+ VectorSubtract(clipstart, cliptrace.endpos, clipdiff);
+ VectorNormalize(clipdiff);
+ // store bentnormal in case the shader has a use for it
+ splatcolor[ 4] = clipdiff[0] * w;
+ splatcolor[ 5] = clipdiff[1] * w;
+ splatcolor[ 6] = clipdiff[2] * w;
+ splatcolor[ 7] = w;
+ // accumulate directional contributions (+X, +Y, +Z, -X, -Y, -Z)
+ splatcolor[ 8] = shotcolor[0] * max(0.0f, clipdiff[0]);
+ splatcolor[ 9] = shotcolor[0] * max(0.0f, clipdiff[1]);
+ splatcolor[10] = shotcolor[0] * max(0.0f, clipdiff[2]);
+ splatcolor[11] = 0.0f;
+ splatcolor[12] = shotcolor[1] * max(0.0f, clipdiff[0]);
+ splatcolor[13] = shotcolor[1] * max(0.0f, clipdiff[1]);
+ splatcolor[14] = shotcolor[1] * max(0.0f, clipdiff[2]);
+ splatcolor[15] = 0.0f;
+ splatcolor[16] = shotcolor[2] * max(0.0f, clipdiff[0]);
+ splatcolor[17] = shotcolor[2] * max(0.0f, clipdiff[1]);
+ splatcolor[18] = shotcolor[2] * max(0.0f, clipdiff[2]);
+ splatcolor[19] = 0.0f;
+ splatcolor[20] = shotcolor[0] * max(0.0f, -clipdiff[0]);
+ splatcolor[21] = shotcolor[0] * max(0.0f, -clipdiff[1]);
+ splatcolor[22] = shotcolor[0] * max(0.0f, -clipdiff[2]);
+ splatcolor[23] = 0.0f;
+ splatcolor[24] = shotcolor[1] * max(0.0f, -clipdiff[0]);
+ splatcolor[25] = shotcolor[1] * max(0.0f, -clipdiff[1]);
+ splatcolor[26] = shotcolor[1] * max(0.0f, -clipdiff[2]);
+ splatcolor[27] = 0.0f;
+ splatcolor[28] = shotcolor[2] * max(0.0f, -clipdiff[0]);
+ splatcolor[29] = shotcolor[2] * max(0.0f, -clipdiff[1]);
+ splatcolor[30] = shotcolor[2] * max(0.0f, -clipdiff[2]);
+ splatcolor[31] = 0.0f;
+ }
+ // calculate the number of steps we need to traverse this distance
+ VectorSubtract(cliptrace.endpos, clipstart, stepdelta);
+ numsteps = (int)(VectorLength(stepdelta) * ispacing[0]);
+ numsteps = bound(1, numsteps, 1024);
+ w = 1.0f / numsteps;
+ VectorScale(stepdelta, w, stepdelta);
+ VectorMA(clipstart, 0.5f, stepdelta, steppos);
+ for (step = 0;step < numsteps;step++)
+ {
+ r_refdef.stats.bouncegrid_splats++;
+ // figure out which texture pixel this is in
+ texlerp[1][0] = ((steppos[0] - mins[0]) * ispacing[0]) - 0.5f;
+ texlerp[1][1] = ((steppos[1] - mins[1]) * ispacing[1]) - 0.5f;
+ texlerp[1][2] = ((steppos[2] - mins[2]) * ispacing[2]) - 0.5f;
+ tex[0] = (int)floor(texlerp[1][0]);
+ tex[1] = (int)floor(texlerp[1][1]);
+ tex[2] = (int)floor(texlerp[1][2]);
+ if (tex[0] >= 1 && tex[1] >= 1 && tex[2] >= 1 && tex[0] < resolution[0] - 2 && tex[1] < resolution[1] - 2 && tex[2] < resolution[2] - 2)
+ {
+ // it is within bounds... do the real work now
+ // calculate the lerp factors
+ texlerp[1][0] -= tex[0];
+ texlerp[1][1] -= tex[1];
+ texlerp[1][2] -= tex[2];
+ texlerp[0][0] = 1.0f - texlerp[1][0];
+ texlerp[0][1] = 1.0f - texlerp[1][1];
+ texlerp[0][2] = 1.0f - texlerp[1][2];
+ // calculate individual pixel indexes and weights
+ pixelindex[0] = (((tex[2] )*resolution[1]+tex[1] )*resolution[0]+tex[0] );pixelweight[0] = (texlerp[0][0]*texlerp[0][1]*texlerp[0][2]);
+ pixelindex[1] = (((tex[2] )*resolution[1]+tex[1] )*resolution[0]+tex[0]+1);pixelweight[1] = (texlerp[1][0]*texlerp[0][1]*texlerp[0][2]);
+ pixelindex[2] = (((tex[2] )*resolution[1]+tex[1]+1)*resolution[0]+tex[0] );pixelweight[2] = (texlerp[0][0]*texlerp[1][1]*texlerp[0][2]);
+ pixelindex[3] = (((tex[2] )*resolution[1]+tex[1]+1)*resolution[0]+tex[0]+1);pixelweight[3] = (texlerp[1][0]*texlerp[1][1]*texlerp[0][2]);
+ pixelindex[4] = (((tex[2]+1)*resolution[1]+tex[1] )*resolution[0]+tex[0] );pixelweight[4] = (texlerp[0][0]*texlerp[0][1]*texlerp[1][2]);
+ pixelindex[5] = (((tex[2]+1)*resolution[1]+tex[1] )*resolution[0]+tex[0]+1);pixelweight[5] = (texlerp[1][0]*texlerp[0][1]*texlerp[1][2]);
+ pixelindex[6] = (((tex[2]+1)*resolution[1]+tex[1]+1)*resolution[0]+tex[0] );pixelweight[6] = (texlerp[0][0]*texlerp[1][1]*texlerp[1][2]);
+ pixelindex[7] = (((tex[2]+1)*resolution[1]+tex[1]+1)*resolution[0]+tex[0]+1);pixelweight[7] = (texlerp[1][0]*texlerp[1][1]*texlerp[1][2]);
+ // update the 8 pixels...
+ for (pixelband = 0;pixelband < pixelbands;pixelband++)
+ {
+ for (corner = 0;corner < 8;corner++)
+ {
+ // calculate address for pixel
+ w = pixelweight[corner];
+ pixel = pixels + 4 * pixelindex[corner] + pixelband * pixelsperband * 4;
+ highpixel = highpixels + 4 * pixelindex[corner] + pixelband * pixelsperband * 4;
+ // add to the high precision pixel color
+ highpixel[0] += (splatcolor[pixelband*4+0]*w);
+ highpixel[1] += (splatcolor[pixelband*4+1]*w);
+ highpixel[2] += (splatcolor[pixelband*4+2]*w);
+ highpixel[3] += (splatcolor[pixelband*4+3]*w);
+ // flag the low precision pixel as needing to be updated
+ pixel[3] = 255;
+ // advance to next band of coefficients
+ //pixel += pixelsperband*4;
+ //highpixel += pixelsperband*4;
+ }
+ }
+ }
+ VectorAdd(steppos, stepdelta, steppos);
+ }
+ }
+ if (cliptrace.fraction >= 1.0f)
+ break;
+ r_refdef.stats.bouncegrid_hits++;
+ if (bouncecount >= maxbounce)
+ break;
+ // scale down shot color by bounce intensity and texture color (or 50% if no texture reported)
+ // also clamp the resulting color to never add energy, even if the user requests extreme values
+ if (cliptrace.hittexture && cliptrace.hittexture->currentskinframe)
+ VectorCopy(cliptrace.hittexture->currentskinframe->avgcolor, surfcolor);
+ else
+ VectorSet(surfcolor, 0.5f, 0.5f, 0.5f);
+ VectorScale(surfcolor, settings.particlebounceintensity, surfcolor);
+ surfcolor[0] = min(surfcolor[0], 1.0f);
+ surfcolor[1] = min(surfcolor[1], 1.0f);
+ surfcolor[2] = min(surfcolor[2], 1.0f);
+ VectorMultiply(shotcolor, surfcolor, shotcolor);
+ if (VectorLength2(baseshotcolor) == 0.0f)
+ break;
+ r_refdef.stats.bouncegrid_bounces++;
+ if (settings.bounceanglediffuse)
+ {
+ // random direction, primarily along plane normal
+ s = VectorDistance(cliptrace.endpos, clipend);
+ if (settings.stablerandom < 0)
+ VectorRandom(clipend);
+ else
+ VectorCheeseRandom(clipend);
+ VectorMA(cliptrace.plane.normal, 0.95f, clipend, clipend);
+ VectorNormalize(clipend);
+ VectorScale(clipend, s, clipend);
+ }
+ else
+ {
+ // reflect the remaining portion of the line across plane normal
+ VectorSubtract(clipend, cliptrace.endpos, clipdiff);
+ VectorReflect(clipdiff, 1.0, cliptrace.plane.normal, clipend);
+ }
+ // calculate the new line start and end
+ VectorCopy(cliptrace.endpos, clipstart);
+ VectorAdd(clipstart, clipend, clipend);
+ }
+ }
+ }
+ // generate pixels array from highpixels array
+ // skip first and last columns, rows, and layers as these are blank
+ // the pixel[3] value was written above, so we can use it to detect only pixels that need to be calculated
+ for (pixelband = 0;pixelband < pixelbands;pixelband++)
+ {
+ for (z = 1;z < resolution[2]-1;z++)
+ {
+ for (y = 1;y < resolution[1]-1;y++)
+ {
+ for (x = 1, pixelindex[0] = ((pixelband*resolution[2]+z)*resolution[1]+y)*resolution[0]+x, pixel = pixels + 4*pixelindex[0], highpixel = highpixels + 4*pixelindex[0];x < resolution[0]-1;x++, pixel += 4, highpixel += 4)
+ {
+ // only convert pixels that were hit by photons
+ if (pixel[3] == 255)
+ {
+ // normalize the bentnormal...
+ if (pixelband == 1)
+ {
+ VectorNormalize(highpixel);
+ c[0] = (int)(highpixel[0]*128.0f+128.0f);
+ c[1] = (int)(highpixel[1]*128.0f+128.0f);
+ c[2] = (int)(highpixel[2]*128.0f+128.0f);
+ c[3] = (int)(highpixel[3]*128.0f+128.0f);
+ }
+ else
+ {
+ c[0] = (int)(highpixel[0]*256.0f);
+ c[1] = (int)(highpixel[1]*256.0f);
+ c[2] = (int)(highpixel[2]*256.0f);
+ c[3] = (int)(highpixel[3]*256.0f);
+ }
+ pixel[2] = (unsigned char)bound(0, c[0], 255);
+ pixel[1] = (unsigned char)bound(0, c[1], 255);
+ pixel[0] = (unsigned char)bound(0, c[2], 255);
+ pixel[3] = (unsigned char)bound(0, c[3], 255);
+ }
+ }
+ }
+ }
+ }
+ if (r_shadow_bouncegridtexture && r_shadow_bouncegridresolution[0] == resolution[0] && r_shadow_bouncegridresolution[1] == resolution[1] && r_shadow_bouncegridresolution[2] == resolution[2] && r_shadow_bouncegriddirectional == settings.directionalshading)
+ R_UpdateTexture(r_shadow_bouncegridtexture, pixels, 0, 0, 0, resolution[0], resolution[1], resolution[2]*pixelbands);
+ else
+ {
+ VectorCopy(resolution, r_shadow_bouncegridresolution);
+ r_shadow_bouncegriddirectional = settings.directionalshading;
+ if (r_shadow_bouncegridtexture)
+ R_FreeTexture(r_shadow_bouncegridtexture);
+ r_shadow_bouncegridtexture = R_LoadTexture3D(r_shadow_texturepool, "bouncegrid", resolution[0], resolution[1], resolution[2]*pixelbands, pixels, TEXTYPE_BGRA, TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCELINEAR, 0, NULL);
+ }
+ r_shadow_bouncegridtime = realtime;
+}
+