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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 "DNA_world_types.h"
#include "DNA_texture_types.h"
#include "DNA_image_types.h"
#include "DRW_render.h"
#include "eevee_engine.h"
#include "eevee_private.h"
#include "GPU_texture.h"
#include "GPU_glew.h"
typedef struct EEVEE_ProbeData {
short probe_id, shadow_id;
} EEVEE_ProbeData;
/* TODO Option */
#define PROBE_SIZE 512
/* *********** FUNCTIONS *********** */
void EEVEE_probes_init(EEVEE_Data *vedata)
{
EEVEE_StorageList *stl = vedata->stl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
if (!stl->probes) {
stl->probes = MEM_callocN(sizeof(EEVEE_ProbesInfo), "EEVEE_ProbesInfo");
}
if (!txl->probe_rt) {
txl->probe_rt = DRW_texture_create_cube(PROBE_SIZE, DRW_TEX_RGBA_16, DRW_TEX_FILTER | DRW_TEX_MIPMAP, NULL);
txl->probe_depth_rt = DRW_texture_create_cube(PROBE_SIZE, DRW_TEX_DEPTH_24, DRW_TEX_FILTER, NULL);
}
DRWFboTexture tex_probe[2] = {{&txl->probe_depth_rt, DRW_TEX_DEPTH_24, DRW_TEX_FILTER},
{&txl->probe_rt, DRW_TEX_RGBA_16, DRW_TEX_FILTER | DRW_TEX_MIPMAP}};
DRW_framebuffer_init(&fbl->probe_fb, &draw_engine_eevee_type, PROBE_SIZE, PROBE_SIZE, tex_probe, 2);
if (!txl->probe_pool) {
/* TODO array */
txl->probe_pool = DRW_texture_create_cube(PROBE_SIZE, DRW_TEX_RGBA_16, DRW_TEX_FILTER | DRW_TEX_MIPMAP, NULL);
}
DRWFboTexture tex_filter = {&txl->probe_pool, DRW_TEX_RGBA_16, DRW_TEX_FILTER | DRW_TEX_MIPMAP};
DRW_framebuffer_init(&fbl->probe_filter_fb, &draw_engine_eevee_type, PROBE_SIZE, PROBE_SIZE, &tex_filter, 1);
/* Spherical Harmonic Buffer */
DRWFboTexture tex_sh = {&txl->probe_sh, DRW_TEX_RGBA_16, DRW_TEX_FILTER | DRW_TEX_MIPMAP};
DRW_framebuffer_init(&fbl->probe_sh_fb, &draw_engine_eevee_type, 9, 1, &tex_sh, 1);
}
void EEVEE_probes_cache_init(EEVEE_Data *UNUSED(vedata))
{
return;
}
void EEVEE_probes_cache_add(EEVEE_Data *UNUSED(vedata), Object *UNUSED(ob))
{
return;
}
void EEVEE_probes_cache_finish(EEVEE_Data *UNUSED(vedata))
{
return;
}
void EEVEE_probes_update(EEVEE_Data *UNUSED(vedata))
{
return;
}
void EEVEE_refresh_probe(EEVEE_Data *vedata)
{
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_PassList *psl = vedata->psl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_ProbesInfo *pinfo = stl->probes;
float projmat[4][4];
/* 1 - Render to cubemap target using geometry shader. */
/* We don't need to clear since we render the background. */
pinfo->layer = 0;
perspective_m4(projmat, -0.1f, 0.1f, -0.1f, 0.1f, 0.1f, 100.0f);
for (int i = 0; i < 6; ++i) {
mul_m4_m4m4(pinfo->probemat[i], projmat, cubefacemat[i]);
}
DRW_framebuffer_bind(fbl->probe_fb);
DRW_draw_pass(psl->probe_background);
/* 2 - Let gpu create Mipmaps for Filtered Importance Sampling. */
/* Bind next framebuffer to be able to write to probe_rt. */
DRW_framebuffer_bind(fbl->probe_filter_fb);
DRW_texture_generate_mipmaps(txl->probe_rt);
/* 3 - Render to probe array to the specified layer, do prefiltering. */
/* Detach to rebind the right mipmap. */
DRW_framebuffer_texture_detach(txl->probe_pool);
float mipsize = PROBE_SIZE * 2;
int miplevels = 1 + (int)floorf(log2f(PROBE_SIZE));
for (int i = 0; i < miplevels - 2; i++) {
float bias = (i == 0) ? 0.0f : 1.0f;
mipsize /= 2;
CLAMP_MIN(mipsize, 1);
pinfo->layer = 0;
pinfo->roughness = (float)i / ((float)miplevels - 3.0f);
pinfo->roughness *= pinfo->roughness; /* Disney Roughness */
pinfo->roughness *= pinfo->roughness; /* Distribute Roughness accros lod more evenly */
CLAMP(pinfo->roughness, 1e-8f, 0.99999f); /* Avoid artifacts */
#if 1 /* Variable Sample count (fast) */
switch (i) {
case 0: pinfo->samples_ct = 1.0f; break;
case 1: pinfo->samples_ct = 16.0f; break;
case 2: pinfo->samples_ct = 32.0f; break;
case 3: pinfo->samples_ct = 64.0f; break;
default: pinfo->samples_ct = 128.0f; break;
}
#else /* Constant Sample count (slow) */
pinfo->samples_ct = 1024.0f;
#endif
pinfo->invsamples_ct = 1.0f / pinfo->samples_ct;
pinfo->lodfactor = bias + 0.5f * log((float)(PROBE_SIZE * PROBE_SIZE) * pinfo->invsamples_ct) / log(2);
pinfo->lodmax = (float)miplevels - 3.0f;
DRW_framebuffer_texture_attach(fbl->probe_filter_fb, txl->probe_pool, 0, i);
DRW_framebuffer_viewport_size(fbl->probe_filter_fb, mipsize, mipsize);
DRW_draw_pass(psl->probe_prefilter);
DRW_framebuffer_texture_detach(txl->probe_pool);
}
/* reattach to have a valid framebuffer. */
DRW_framebuffer_texture_attach(fbl->probe_filter_fb, txl->probe_pool, 0, 0);
/* 4 - Compute spherical harmonics */
/* Tweaking parameters to balance perf. vs precision */
pinfo->shres = 16; /* Less texture fetches & reduce branches */
pinfo->lodfactor = 4.0f; /* Improve cache reuse */
DRW_framebuffer_bind(fbl->probe_sh_fb);
DRW_draw_pass(psl->probe_sh_compute);
DRW_framebuffer_read_data(0, 0, 9, 1, 3, 0, (float *)pinfo->shcoefs);
}
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