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/*
* 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.
*
* Copyright 2019, Blender Foundation.
*/
/** \file
* \ingroup EEVEE
*/
#include "BLI_sys_types.h" /* bool */
// #include "BLI_dynstr.h"
// #include "BLI_rand.h"
#include "BKE_object.h"
#include "DEG_depsgraph_query.h"
#include "eevee_private.h"
#define SH_CASTER_ALLOC_CHUNK 32
static struct {
struct GPUShader *shadow_sh;
} e_data = {NULL}; /* Engine data */
extern char datatoc_shadow_vert_glsl[];
extern char datatoc_shadow_frag_glsl[];
extern char datatoc_common_view_lib_glsl[];
void eevee_contact_shadow_setup(const Light *la, EEVEE_Shadow *evsh)
{
evsh->contact_dist = (la->mode & LA_SHAD_CONTACT) ? la->contact_dist : 0.0f;
evsh->contact_bias = 0.05f * la->contact_bias;
evsh->contact_thickness = la->contact_thickness;
}
void EEVEE_shadows_init(EEVEE_ViewLayerData *sldata)
{
const uint shadow_ubo_size = sizeof(EEVEE_Shadow) * MAX_SHADOW +
sizeof(EEVEE_ShadowCube) * MAX_SHADOW_CUBE +
sizeof(EEVEE_ShadowCascade) * MAX_SHADOW_CASCADE;
const DRWContextState *draw_ctx = DRW_context_state_get();
const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);
if (!e_data.shadow_sh) {
e_data.shadow_sh = DRW_shader_create_with_lib(datatoc_shadow_vert_glsl,
NULL,
datatoc_shadow_frag_glsl,
datatoc_common_view_lib_glsl,
NULL);
}
if (!sldata->lights) {
sldata->lights = MEM_callocN(sizeof(EEVEE_LightsInfo), "EEVEE_LightsInfo");
sldata->light_ubo = DRW_uniformbuffer_create(sizeof(EEVEE_Light) * MAX_LIGHT, NULL);
sldata->shadow_ubo = DRW_uniformbuffer_create(shadow_ubo_size, NULL);
for (int i = 0; i < 2; i++) {
sldata->shcasters_buffers[i].bbox = MEM_callocN(
sizeof(EEVEE_BoundBox) * SH_CASTER_ALLOC_CHUNK, __func__);
sldata->shcasters_buffers[i].update = BLI_BITMAP_NEW(SH_CASTER_ALLOC_CHUNK, __func__);
sldata->shcasters_buffers[i].alloc_count = SH_CASTER_ALLOC_CHUNK;
sldata->shcasters_buffers[i].count = 0;
}
sldata->lights->shcaster_frontbuffer = &sldata->shcasters_buffers[0];
sldata->lights->shcaster_backbuffer = &sldata->shcasters_buffers[1];
}
/* Flip buffers */
SWAP(EEVEE_ShadowCasterBuffer *,
sldata->lights->shcaster_frontbuffer,
sldata->lights->shcaster_backbuffer);
int sh_cube_size = scene_eval->eevee.shadow_cube_size;
int sh_cascade_size = scene_eval->eevee.shadow_cascade_size;
const bool sh_high_bitdepth = (scene_eval->eevee.flag & SCE_EEVEE_SHADOW_HIGH_BITDEPTH) != 0;
sldata->lights->soft_shadows = (scene_eval->eevee.flag & SCE_EEVEE_SHADOW_SOFT) != 0;
EEVEE_LightsInfo *linfo = sldata->lights;
if ((linfo->shadow_cube_size != sh_cube_size) ||
(linfo->shadow_high_bitdepth != sh_high_bitdepth)) {
BLI_assert((sh_cube_size > 0) && (sh_cube_size <= 4096));
DRW_TEXTURE_FREE_SAFE(sldata->shadow_cube_pool);
CLAMP(sh_cube_size, 1, 4096);
}
if ((linfo->shadow_cascade_size != sh_cascade_size) ||
(linfo->shadow_high_bitdepth != sh_high_bitdepth)) {
BLI_assert((sh_cascade_size > 0) && (sh_cascade_size <= 4096));
DRW_TEXTURE_FREE_SAFE(sldata->shadow_cascade_pool);
CLAMP(sh_cascade_size, 1, 4096);
}
linfo->shadow_high_bitdepth = sh_high_bitdepth;
linfo->shadow_cube_size = sh_cube_size;
linfo->shadow_cascade_size = sh_cascade_size;
}
void EEVEE_shadows_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
EEVEE_LightsInfo *linfo = sldata->lights;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_PassList *psl = vedata->psl;
EEVEE_ShadowCasterBuffer *backbuffer = linfo->shcaster_backbuffer;
EEVEE_ShadowCasterBuffer *frontbuffer = linfo->shcaster_frontbuffer;
frontbuffer->count = 0;
linfo->num_cube_layer = 0;
linfo->num_cascade_layer = 0;
linfo->cube_len = linfo->cascade_len = linfo->shadow_len = 0;
/* Shadow Casters: Reset flags. */
BLI_bitmap_set_all(backbuffer->update, true, backbuffer->alloc_count);
/* Is this one needed? */
BLI_bitmap_set_all(frontbuffer->update, false, frontbuffer->alloc_count);
INIT_MINMAX(linfo->shcaster_aabb.min, linfo->shcaster_aabb.max);
{
DRWState state = DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_SHADOW_OFFSET;
DRW_PASS_CREATE(psl->shadow_pass, state);
stl->g_data->shadow_shgrp = DRW_shgroup_create(e_data.shadow_sh, psl->shadow_pass);
}
}
/* Add a shadow caster to the shadowpasses */
void EEVEE_shadows_caster_add(EEVEE_ViewLayerData *UNUSED(sldata),
EEVEE_StorageList *stl,
struct GPUBatch *geom,
Object *ob)
{
DRW_shgroup_call(stl->g_data->shadow_shgrp, geom, ob);
}
void EEVEE_shadows_caster_material_add(EEVEE_ViewLayerData *sldata,
EEVEE_PassList *psl,
struct GPUMaterial *gpumat,
struct GPUBatch *geom,
struct Object *ob,
const float *alpha_threshold)
{
/* TODO / PERF : reuse the same shading group for objects with the same material */
DRWShadingGroup *grp = DRW_shgroup_material_create(gpumat, psl->shadow_pass);
if (grp == NULL) {
return;
}
/* Unfortunately needed for correctness but not 99% of the time not needed.
* TODO detect when needed? */
DRW_shgroup_uniform_block(grp, "probe_block", sldata->probe_ubo);
DRW_shgroup_uniform_block(grp, "grid_block", sldata->grid_ubo);
DRW_shgroup_uniform_block(grp, "planar_block", sldata->planar_ubo);
DRW_shgroup_uniform_block(grp, "light_block", sldata->light_ubo);
DRW_shgroup_uniform_block(grp, "shadow_block", sldata->shadow_ubo);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
if (alpha_threshold != NULL) {
DRW_shgroup_uniform_float(grp, "alphaThreshold", alpha_threshold, 1);
}
DRW_shgroup_call(grp, geom, ob);
}
/* Make that object update shadow casting lights inside its influence bounding box. */
void EEVEE_shadows_caster_register(EEVEE_ViewLayerData *sldata, Object *ob)
{
EEVEE_LightsInfo *linfo = sldata->lights;
EEVEE_ShadowCasterBuffer *backbuffer = linfo->shcaster_backbuffer;
EEVEE_ShadowCasterBuffer *frontbuffer = linfo->shcaster_frontbuffer;
bool update = true;
int id = frontbuffer->count;
/* Make sure shadow_casters is big enough. */
if (id + 1 >= frontbuffer->alloc_count) {
frontbuffer->alloc_count += SH_CASTER_ALLOC_CHUNK;
frontbuffer->bbox = MEM_reallocN(frontbuffer->bbox,
sizeof(EEVEE_BoundBox) * frontbuffer->alloc_count);
BLI_BITMAP_RESIZE(frontbuffer->update, frontbuffer->alloc_count);
}
if (ob->base_flag & BASE_FROM_DUPLI) {
/* Duplis will always refresh the shadowmaps as if they were deleted each frame. */
/* TODO(fclem) fix this. */
update = true;
}
else {
EEVEE_ObjectEngineData *oedata = EEVEE_object_data_ensure(ob);
int past_id = oedata->shadow_caster_id;
oedata->shadow_caster_id = id;
/* Update flags in backbuffer. */
if (past_id > -1 && past_id < backbuffer->count) {
BLI_BITMAP_SET(backbuffer->update, past_id, oedata->need_update);
}
update = oedata->need_update;
oedata->need_update = false;
}
if (update) {
BLI_BITMAP_ENABLE(frontbuffer->update, id);
}
/* Update World AABB in frontbuffer. */
BoundBox *bb = BKE_object_boundbox_get(ob);
float min[3], max[3];
INIT_MINMAX(min, max);
for (int i = 0; i < 8; i++) {
float vec[3];
copy_v3_v3(vec, bb->vec[i]);
mul_m4_v3(ob->obmat, vec);
minmax_v3v3_v3(min, max, vec);
}
EEVEE_BoundBox *aabb = &frontbuffer->bbox[id];
add_v3_v3v3(aabb->center, min, max);
mul_v3_fl(aabb->center, 0.5f);
sub_v3_v3v3(aabb->halfdim, aabb->center, max);
aabb->halfdim[0] = fabsf(aabb->halfdim[0]);
aabb->halfdim[1] = fabsf(aabb->halfdim[1]);
aabb->halfdim[2] = fabsf(aabb->halfdim[2]);
minmax_v3v3_v3(linfo->shcaster_aabb.min, linfo->shcaster_aabb.max, min);
minmax_v3v3_v3(linfo->shcaster_aabb.min, linfo->shcaster_aabb.max, max);
frontbuffer->count++;
}
/* Used for checking if object is inside the shadow volume. */
static bool sphere_bbox_intersect(const BoundSphere *bs, const EEVEE_BoundBox *bb)
{
/* We are testing using a rougher AABB vs AABB test instead of full AABB vs Sphere. */
/* TODO test speed with AABB vs Sphere. */
bool x = fabsf(bb->center[0] - bs->center[0]) <= (bb->halfdim[0] + bs->radius);
bool y = fabsf(bb->center[1] - bs->center[1]) <= (bb->halfdim[1] + bs->radius);
bool z = fabsf(bb->center[2] - bs->center[2]) <= (bb->halfdim[2] + bs->radius);
return x && y && z;
}
void EEVEE_shadows_update(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
EEVEE_LightsInfo *linfo = sldata->lights;
EEVEE_ShadowCasterBuffer *backbuffer = linfo->shcaster_backbuffer;
EEVEE_ShadowCasterBuffer *frontbuffer = linfo->shcaster_frontbuffer;
eGPUTextureFormat shadow_pool_format = (linfo->shadow_high_bitdepth) ? GPU_DEPTH_COMPONENT24 :
GPU_DEPTH_COMPONENT16;
/* Setup enough layers. */
/* Free textures if number mismatch. */
if (linfo->num_cube_layer != linfo->cache_num_cube_layer) {
DRW_TEXTURE_FREE_SAFE(sldata->shadow_cube_pool);
linfo->cache_num_cube_layer = linfo->num_cube_layer;
/* Update all lights. */
BLI_bitmap_set_all(&linfo->sh_cube_update[0], true, MAX_LIGHT);
}
if (linfo->num_cascade_layer != linfo->cache_num_cascade_layer) {
DRW_TEXTURE_FREE_SAFE(sldata->shadow_cascade_pool);
linfo->cache_num_cascade_layer = linfo->num_cascade_layer;
}
if (!sldata->shadow_cube_pool) {
/* TODO shadowcube array. */
int cube_size = linfo->shadow_cube_size + ((true) ? 2 : 0);
sldata->shadow_cube_pool = DRW_texture_create_2d_array(cube_size,
cube_size,
max_ii(1, linfo->num_cube_layer * 6),
shadow_pool_format,
DRW_TEX_FILTER | DRW_TEX_COMPARE,
NULL);
}
if (!sldata->shadow_cascade_pool) {
sldata->shadow_cascade_pool = DRW_texture_create_2d_array(linfo->shadow_cascade_size,
linfo->shadow_cascade_size,
max_ii(1, linfo->num_cascade_layer),
shadow_pool_format,
DRW_TEX_FILTER | DRW_TEX_COMPARE,
NULL);
}
if (sldata->shadow_fb == NULL) {
sldata->shadow_fb = GPU_framebuffer_create();
}
/* Gather all light own update bits. to avoid costly intersection check. */
for (int j = 0; j < linfo->cube_len; j++) {
const EEVEE_Light *evli = linfo->light_data + linfo->shadow_cube_light_indices[j];
/* Setup shadow cube in UBO and tag for update if necessary. */
if (EEVEE_shadows_cube_setup(linfo, evli, effects->taa_current_sample - 1)) {
BLI_BITMAP_ENABLE(&linfo->sh_cube_update[0], j);
}
}
/* TODO(fclem) This part can be slow, optimize it. */
EEVEE_BoundBox *bbox = backbuffer->bbox;
BoundSphere *bsphere = linfo->shadow_bounds;
/* Search for deleted shadow casters or if shcaster WAS in shadow radius. */
for (int i = 0; i < backbuffer->count; i++) {
/* If the shadowcaster has been deleted or updated. */
if (BLI_BITMAP_TEST(backbuffer->update, i)) {
for (int j = 0; j < linfo->cube_len; j++) {
if (!BLI_BITMAP_TEST(&linfo->sh_cube_update[0], j)) {
if (sphere_bbox_intersect(&bsphere[j], &bbox[i])) {
BLI_BITMAP_ENABLE(&linfo->sh_cube_update[0], j);
}
}
}
}
}
/* Search for updates in current shadow casters. */
bbox = frontbuffer->bbox;
for (int i = 0; i < frontbuffer->count; i++) {
/* If the shadowcaster has been updated. */
if (BLI_BITMAP_TEST(frontbuffer->update, i)) {
for (int j = 0; j < linfo->cube_len; j++) {
if (!BLI_BITMAP_TEST(&linfo->sh_cube_update[0], j)) {
if (sphere_bbox_intersect(&bsphere[j], &bbox[i])) {
BLI_BITMAP_ENABLE(&linfo->sh_cube_update[0], j);
}
}
}
}
}
/* Resize shcasters buffers if too big. */
if (frontbuffer->alloc_count - frontbuffer->count > SH_CASTER_ALLOC_CHUNK) {
frontbuffer->alloc_count = (frontbuffer->count / SH_CASTER_ALLOC_CHUNK) *
SH_CASTER_ALLOC_CHUNK;
frontbuffer->alloc_count += (frontbuffer->count % SH_CASTER_ALLOC_CHUNK != 0) ?
SH_CASTER_ALLOC_CHUNK :
0;
frontbuffer->bbox = MEM_reallocN(frontbuffer->bbox,
sizeof(EEVEE_BoundBox) * frontbuffer->alloc_count);
BLI_BITMAP_RESIZE(frontbuffer->update, frontbuffer->alloc_count);
}
}
/* this refresh lights shadow buffers */
void EEVEE_shadows_draw(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata, DRWView *view)
{
EEVEE_LightsInfo *linfo = sldata->lights;
int saved_ray_type = sldata->common_data.ray_type;
/* Precompute all shadow/view test before rendering and trashing the culling cache. */
BLI_bitmap *cube_visible = BLI_BITMAP_NEW_ALLOCA(MAX_SHADOW_CUBE);
bool any_visible = linfo->cascade_len > 0;
for (int cube = 0; cube < linfo->cube_len; cube++) {
if (DRW_culling_sphere_test(view, linfo->shadow_bounds + cube)) {
BLI_BITMAP_ENABLE(cube_visible, cube);
any_visible = true;
}
}
if (any_visible) {
sldata->common_data.ray_type = EEVEE_RAY_SHADOW;
DRW_uniformbuffer_update(sldata->common_ubo, &sldata->common_data);
}
DRW_stats_group_start("Cube Shadow Maps");
{
for (int cube = 0; cube < linfo->cube_len; cube++) {
if (BLI_BITMAP_TEST(cube_visible, cube) && BLI_BITMAP_TEST(linfo->sh_cube_update, cube)) {
EEVEE_shadows_draw_cubemap(sldata, vedata, cube);
}
}
}
DRW_stats_group_end();
DRW_stats_group_start("Cascaded Shadow Maps");
{
for (int cascade = 0; cascade < linfo->cascade_len; cascade++) {
EEVEE_shadows_draw_cascades(sldata, vedata, view, cascade);
}
}
DRW_stats_group_end();
DRW_view_set_active(view);
DRW_uniformbuffer_update(sldata->shadow_ubo, &linfo->shadow_data); /* Update all data at once */
if (any_visible) {
sldata->common_data.ray_type = saved_ray_type;
DRW_uniformbuffer_update(sldata->common_ubo, &sldata->common_data);
}
}
void EEVEE_shadows_free(void)
{
DRW_SHADER_FREE_SAFE(e_data.shadow_sh);
}
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