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/*
* Copyright 2016, Blender Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor(s): Blender Institute
*
*/
/** \file eevee_lights.c
* \ingroup DNA
*/
#include "DRW_render.h"
#include "eevee_private.h"
#define MAX_LIGHT 210 /* TODO : find size by dividing UBO max size by light data size */
typedef struct EEVEE_Light {
float position[3], dist;
float color[3], spec;
float spotsize, spotblend, radius, shadowid;
float rightvec[3], sizex;
float upvec[3], sizey;
float forwardvec[3], lamptype;
} EEVEE_Light;
void EEVEE_lights_init(EEVEE_StorageList *stl)
{
stl->lights_info = MEM_callocN(sizeof(EEVEE_LightsInfo), "EEVEE_LightsInfo");
stl->lights_data = MEM_mallocN(sizeof(EEVEE_Light) * MAX_LIGHT, "EEVEE_LightsUboStorage");
stl->lights_ref = MEM_mallocN(sizeof(Object *) * MAX_LIGHT, "EEVEE lights_ref");
stl->lights_ubo = DRW_uniformbuffer_create(sizeof(EEVEE_Light) * MAX_LIGHT, NULL);
}
void EEVEE_lights_cache_init(EEVEE_StorageList *stl)
{
BLI_listbase_clear(&stl->g_data->lamps);
stl->lights_info->light_count = 0;
}
void EEVEE_lights_cache_add(EEVEE_StorageList *stl, Object *ob)
{
BLI_addtail(&stl->g_data->lamps, BLI_genericNodeN(ob));
stl->lights_info->light_count += 1;
}
void EEVEE_lights_cache_finish(EEVEE_StorageList *stl)
{
int light_ct = stl->lights_info->light_count;
if (light_ct > MAX_LIGHT) {
printf("Too much lamps in the scene !!!\n");
stl->lights_info->light_count = MAX_LIGHT;
}
if (light_ct > 0) {
int i = 0;
for (LinkData *link = stl->g_data->lamps.first; link && i < MAX_LIGHT; link = link->next, i++) {
Object *ob = (Object *)link->data;
stl->lights_ref[i] = ob;
}
}
BLI_freelistN(&stl->g_data->lamps);
/* We changed light data so we need to upload it */
EEVEE_lights_update(stl);
}
void EEVEE_lights_update(EEVEE_StorageList *stl)
{
int light_ct = stl->lights_info->light_count;
/* TODO only update if data changes */
/* Update buffer with lamp data */
for (int i = 0; i < light_ct; ++i) {
EEVEE_Light *evli = stl->lights_data + i;
Object *ob = stl->lights_ref[i];
Lamp *la = (Lamp *)ob->data;
float mat[4][4], scale[3], power;
/* Position */
copy_v3_v3(evli->position, ob->obmat[3]);
/* Color */
evli->color[0] = la->r * la->energy;
evli->color[1] = la->g * la->energy;
evli->color[2] = la->b * la->energy;
/* Influence Radius */
evli->dist = la->dist;
/* Vectors */
normalize_m4_m4_ex(mat, ob->obmat, scale);
copy_v3_v3(evli->forwardvec, mat[2]);
normalize_v3(evli->forwardvec);
negate_v3(evli->forwardvec);
copy_v3_v3(evli->rightvec, mat[0]);
normalize_v3(evli->rightvec);
copy_v3_v3(evli->upvec, mat[1]);
normalize_v3(evli->upvec);
/* Spot size & blend */
if (la->type == LA_SPOT) {
evli->sizex = scale[0] / scale[2];
evli->sizey = scale[1] / scale[2];
evli->spotsize = cosf(la->spotsize * 0.5f);
evli->spotblend = (1.0f - evli->spotsize) * la->spotblend;
}
else if (la->type == LA_AREA) {
evli->sizex = MAX2(0.0001f, la->area_size * scale[0] * 0.5f);
if (la->area_shape == LA_AREA_RECT) {
evli->sizey = MAX2(0.0001f, la->area_sizey * scale[1] * 0.5f);
}
else {
evli->sizey = evli->sizex;
}
}
else {
evli->sizex = MAX2(0.0001f, la->area_size);
}
/* Make illumination power constant */
if (la->type == LA_AREA) {
power = 1.0f / (evli->sizex * evli->sizey * 4.0f * M_PI) /* 1/(w*h*Pi) */
* M_PI * 10.0f; /* XXX : Empirical, Fit cycles power */
}
else if (la->type == LA_SPOT || la->type == LA_LOCAL) {
power = 1.0f / (4.0f * evli->sizex * evli->sizex * M_PI * M_PI) /* 1/(4*r²*Pi²) */
* M_PI * 100.0; /* XXX : Empirical, Fit cycles power */
/* for point lights (a.k.a radius == 0.0) */
// power = M_PI * M_PI * 0.78; /* XXX : Empirical, Fit cycles power */
}
else {
power = 1.0f;
}
mul_v3_fl(evli->color, power);
/* Lamp Type */
evli->lamptype = (float)la->type;
}
/* Upload buffer to GPU */
DRW_uniformbuffer_update(stl->lights_ubo, stl->lights_data);
}
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