blender-archive/source/blender/draw/engines/eevee/eevee_lightprobes.c

/*
 * 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 2016, Blender Foundation.
 */

/** \file
 * \ingroup draw_engine
 */

#include "DRW_render.h"

#include "BLI_utildefines.h"
#include "BLI_rand.h"

#include "DNA_world_types.h"
#include "DNA_texture_types.h"
#include "DNA_image_types.h"
#include "DNA_lightprobe_types.h"
#include "DNA_view3d_types.h"

#include "BKE_collection.h"
#include "BKE_object.h"
#include "MEM_guardedalloc.h"

#include "GPU_material.h"
#include "GPU_texture.h"

#include "DEG_depsgraph_query.h"

#include "eevee_lightcache.h"
#include "eevee_private.h"


#include "WM_api.h"
#include "WM_types.h"

static struct {
	struct GPUTexture *hammersley;
	struct GPUTexture *planar_pool_placeholder;
	struct GPUTexture *depth_placeholder;
	struct GPUTexture *depth_array_placeholder;
	struct GPUTexture *cube_face_minmaxz;

	struct GPUVertFormat *format_probe_display_cube;
	struct GPUVertFormat *format_probe_display_planar;
} e_data = {NULL}; /* Engine data */


/* *********** FUNCTIONS *********** */

/* TODO find a better way than this. This does not support dupli objects if
 * the original object is hidden. */
bool EEVEE_lightprobes_obj_visibility_cb(bool vis_in, void *user_data)
{
	EEVEE_ObjectEngineData *oed = (EEVEE_ObjectEngineData *)user_data;

	/* test disabled if group is NULL */
	if (oed->test_data->collection == NULL) {
		return vis_in;
	}

	if (oed->test_data->cached == false) {
		oed->ob_vis_dirty = true;
	}

	/* early out, don't need to compute ob_vis yet. */
	if (vis_in == false) {
		return vis_in;
	}

	if (oed->ob_vis_dirty) {
		oed->ob_vis_dirty = false;
		oed->ob_vis = BKE_collection_has_object_recursive(oed->test_data->collection, oed->ob);
		oed->ob_vis = (oed->test_data->invert) ? !oed->ob_vis : oed->ob_vis;
	}

	return vis_in && oed->ob_vis;
}

static struct GPUTexture *create_hammersley_sample_texture(int samples)
{
	struct GPUTexture *tex;
	float (*texels)[2] = MEM_mallocN(sizeof(float[2]) * samples, "hammersley_tex");
	int i;

	for (i = 0; i < samples; i++) {
		double dphi;
		BLI_hammersley_1D(i, &dphi);
		float phi = (float)dphi * 2.0f * M_PI;
		texels[i][0] = cosf(phi);
		texels[i][1] = sinf(phi);
	}

	tex = DRW_texture_create_1D(samples, GPU_RG16F, DRW_TEX_WRAP, (float *)texels);
	MEM_freeN(texels);
	return tex;
}

static void planar_pool_ensure_alloc(EEVEE_Data *vedata, int num_planar_ref)
{
	EEVEE_TextureList *txl = vedata->txl;

	/* XXX TODO OPTIMISATION : This is a complete waist of texture memory.
	 * Instead of allocating each planar probe for each viewport,
	 * only alloc them once using the biggest viewport resolution. */
	const float *viewport_size = DRW_viewport_size_get();

	/* TODO get screen percentage from layer setting */
	// const DRWContextState *draw_ctx = DRW_context_state_get();
	// ViewLayer *view_layer = draw_ctx->view_layer;
	float screen_percentage = 1.0f;

	int width = (int)(viewport_size[0] * screen_percentage);
	int height = (int)(viewport_size[1] * screen_percentage);

	/* We need an Array texture so allocate it ourself */
	if (!txl->planar_pool) {
		if (num_planar_ref > 0) {
			txl->planar_pool = DRW_texture_create_2D_array(width, height, max_ff(1, num_planar_ref),
			                                                 GPU_R11F_G11F_B10F, DRW_TEX_FILTER | DRW_TEX_MIPMAP, NULL);
			txl->planar_depth = DRW_texture_create_2D_array(width, height, max_ff(1, num_planar_ref),
			                                                GPU_DEPTH_COMPONENT24, 0, NULL);
		}
		else if (num_planar_ref == 0) {
			/* Makes Opengl Happy : Create a placeholder texture that will never be sampled but still bound to shader. */
			txl->planar_pool = DRW_texture_create_2D_array(1, 1, 1, GPU_RGBA8, DRW_TEX_FILTER | DRW_TEX_MIPMAP, NULL);
			txl->planar_depth = DRW_texture_create_2D_array(1, 1, 1, GPU_DEPTH_COMPONENT24, 0, NULL);
		}
	}
}

void EEVEE_lightprobes_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
	EEVEE_CommonUniformBuffer *common_data = &sldata->common_data;
	EEVEE_StorageList *stl = vedata->stl;

	const DRWContextState *draw_ctx = DRW_context_state_get();
	const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);

	if (!e_data.hammersley) {
		EEVEE_shaders_lightprobe_shaders_init();
		e_data.hammersley = create_hammersley_sample_texture(HAMMERSLEY_SIZE);
	}

	/* Use fallback if we don't have gpu texture allocated an we cannot restore them. */
	bool use_fallback_lightcache = (scene_eval->eevee.light_cache == NULL) ||
	                               ((scene_eval->eevee.light_cache->grid_tx.tex == NULL) &&
	                                (scene_eval->eevee.light_cache->grid_tx.data == NULL)) ||
	                               ((scene_eval->eevee.light_cache->cube_tx.tex == NULL) &&
	                                (scene_eval->eevee.light_cache->cube_tx.data == NULL));

	if (use_fallback_lightcache && (sldata->fallback_lightcache == NULL)) {
#if defined(IRRADIANCE_SH_L2)
		int grid_res = 4;
#elif defined(IRRADIANCE_CUBEMAP)
		int grid_res = 8;
#elif defined(IRRADIANCE_HL2)
		int grid_res = 4;
#endif
		int cube_res = OCTAHEDRAL_SIZE_FROM_CUBESIZE(scene_eval->eevee.gi_cubemap_resolution);
		int vis_res = scene_eval->eevee.gi_visibility_resolution;
		sldata->fallback_lightcache = EEVEE_lightcache_create(1, 1, cube_res, vis_res, (int[3]){grid_res, grid_res, 1});
	}

	stl->g_data->light_cache = (use_fallback_lightcache) ? sldata->fallback_lightcache : scene_eval->eevee.light_cache;

	EEVEE_lightcache_load(stl->g_data->light_cache);

	if (!sldata->probes) {
		sldata->probes = MEM_callocN(sizeof(EEVEE_LightProbesInfo), "EEVEE_LightProbesInfo");
		sldata->probe_ubo = DRW_uniformbuffer_create(sizeof(EEVEE_LightProbe) * MAX_PROBE, NULL);
		sldata->grid_ubo = DRW_uniformbuffer_create(sizeof(EEVEE_LightGrid) * MAX_GRID, NULL);
		sldata->planar_ubo = DRW_uniformbuffer_create(sizeof(EEVEE_PlanarReflection) * MAX_PLANAR, NULL);
	}

	common_data->prb_num_planar = 0;
	common_data->prb_num_render_cube = 1;
	common_data->prb_num_render_grid = 1;

	common_data->spec_toggle = true;
	common_data->ssr_toggle = true;
	common_data->sss_toggle = true;

	/* Placeholder planar pool: used when rendering planar reflections (avoid dependency loop). */
	if (!e_data.planar_pool_placeholder) {
		e_data.planar_pool_placeholder = DRW_texture_create_2D_array(1, 1, 1, GPU_RGBA8, DRW_TEX_FILTER, NULL);
	}
}

/* Only init the passes useful for rendering the light cache. */
void EEVEE_lightbake_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata, GPUTexture *rt_color, GPUTexture *rt_depth)
{
	EEVEE_PassList *psl = vedata->psl;
	LightCache *light_cache = vedata->stl->g_data->light_cache;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;

	{
		psl->probe_glossy_compute = DRW_pass_create("LightProbe Glossy Compute", DRW_STATE_WRITE_COLOR);

		DRWShadingGroup *grp = DRW_shgroup_create(
		        EEVEE_shaders_probe_filter_glossy_sh_get(), psl->probe_glossy_compute);

		DRW_shgroup_uniform_float(grp, "intensityFac", &pinfo->intensity_fac, 1);
		DRW_shgroup_uniform_float(grp, "sampleCount", &pinfo->samples_len, 1);
		DRW_shgroup_uniform_float(grp, "invSampleCount", &pinfo->samples_len_inv, 1);
		DRW_shgroup_uniform_float(grp, "roughnessSquared", &pinfo->roughness, 1);
		DRW_shgroup_uniform_float(grp, "lodFactor", &pinfo->lodfactor, 1);
		DRW_shgroup_uniform_float(grp, "lodMax", &pinfo->lod_rt_max, 1);
		DRW_shgroup_uniform_float(grp, "texelSize", &pinfo->texel_size, 1);
		DRW_shgroup_uniform_float(grp, "paddingSize", &pinfo->padding_size, 1);
		DRW_shgroup_uniform_float(grp, "fireflyFactor", &pinfo->firefly_fac, 1);
		DRW_shgroup_uniform_int(grp, "Layer", &pinfo->layer, 1);
		DRW_shgroup_uniform_texture(grp, "texHammersley", e_data.hammersley);
		// DRW_shgroup_uniform_texture(grp, "texJitter", e_data.jitter);
		DRW_shgroup_uniform_texture(grp, "probeHdr", rt_color);
		DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);

		struct GPUBatch *geom = DRW_cache_fullscreen_quad_get();
		DRW_shgroup_call_add(grp, geom, NULL);
	}

	{
		psl->probe_diffuse_compute = DRW_pass_create("LightProbe Diffuse Compute", DRW_STATE_WRITE_COLOR);

		DRWShadingGroup *grp = DRW_shgroup_create(
		        EEVEE_shaders_probe_filter_diffuse_sh_get(), psl->probe_diffuse_compute);
#ifdef IRRADIANCE_SH_L2
		DRW_shgroup_uniform_int(grp, "probeSize", &pinfo->shres, 1);
#else
		DRW_shgroup_uniform_float(grp, "sampleCount", &pinfo->samples_len, 1);
		DRW_shgroup_uniform_float(grp, "invSampleCount", &pinfo->samples_len_inv, 1);
		DRW_shgroup_uniform_float(grp, "lodFactor", &pinfo->lodfactor, 1);
		DRW_shgroup_uniform_float(grp, "lodMax", &pinfo->lod_rt_max, 1);
		DRW_shgroup_uniform_texture(grp, "texHammersley", e_data.hammersley);
#endif
		DRW_shgroup_uniform_float(grp, "intensityFac", &pinfo->intensity_fac, 1);
		DRW_shgroup_uniform_texture(grp, "probeHdr", rt_color);
		DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);

		struct GPUBatch *geom = DRW_cache_fullscreen_quad_get();
		DRW_shgroup_call_add(grp, geom, NULL);
	}

	{
		psl->probe_visibility_compute = DRW_pass_create("LightProbe Visibility Compute", DRW_STATE_WRITE_COLOR);

		DRWShadingGroup *grp = DRW_shgroup_create(EEVEE_shaders_probe_filter_visibility_sh_get(), psl->probe_visibility_compute);
		DRW_shgroup_uniform_int(grp, "outputSize", &pinfo->shres, 1);
		DRW_shgroup_uniform_float(grp, "visibilityRange", &pinfo->visibility_range, 1);
		DRW_shgroup_uniform_float(grp, "visibilityBlur", &pinfo->visibility_blur, 1);
		DRW_shgroup_uniform_float(grp, "sampleCount", &pinfo->samples_len, 1);
		DRW_shgroup_uniform_float(grp, "invSampleCount", &pinfo->samples_len_inv, 1);
		DRW_shgroup_uniform_float(grp, "storedTexelSize", &pinfo->texel_size, 1);
		DRW_shgroup_uniform_float(grp, "nearClip", &pinfo->near_clip, 1);
		DRW_shgroup_uniform_float(grp, "farClip", &pinfo->far_clip, 1);
		DRW_shgroup_uniform_texture(grp, "texHammersley", e_data.hammersley);
		DRW_shgroup_uniform_texture(grp, "probeDepth", rt_depth);
		DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);

		struct GPUBatch *geom = DRW_cache_fullscreen_quad_get();
		DRW_shgroup_call_add(grp, geom, NULL);
	}

	{
		psl->probe_grid_fill = DRW_pass_create("LightProbe Grid Floodfill", DRW_STATE_WRITE_COLOR);

		DRWShadingGroup *grp = DRW_shgroup_create(
		        EEVEE_shaders_probe_grid_fill_sh_get(), psl->probe_grid_fill);

		DRW_shgroup_uniform_texture_ref(grp, "irradianceGrid", &light_cache->grid_tx.tex);

		struct GPUBatch *geom = DRW_cache_fullscreen_quad_get();
		DRW_shgroup_call_add(grp, geom, NULL);
	}
}

void EEVEE_lightprobes_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
	EEVEE_TextureList *txl = vedata->txl;
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_StorageList *stl = vedata->stl;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	LightCache *lcache = stl->g_data->light_cache;
	const DRWContextState *draw_ctx = DRW_context_state_get();
	const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);

	pinfo->num_planar = 0;
	pinfo->vis_data.collection = NULL;
	pinfo->do_grid_update = false;
	pinfo->do_cube_update = false;

	{
		psl->probe_background = DRW_pass_create("World Probe Background Pass", DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_EQUAL);

		struct GPUBatch *geom = DRW_cache_fullscreen_quad_get();
		DRWShadingGroup *grp = NULL;

		Scene *scene = draw_ctx->scene;
		World *wo = scene->world;

		const float *col = G_draw.block.colorBackground;

		/* LookDev */
		EEVEE_lookdev_cache_init(vedata, &grp, psl->probe_background, wo, pinfo);
		/* END */
		if (!grp && wo) {
			col = &wo->horr;

			if (wo->use_nodes && wo->nodetree) {
				static float error_col[3] = {1.0f, 0.0f, 1.0f};
				struct GPUMaterial *gpumat = EEVEE_material_world_lightprobe_get(scene, wo);

				eGPUMaterialStatus status = GPU_material_status(gpumat);

				switch (status) {
					case GPU_MAT_SUCCESS:
						grp = DRW_shgroup_material_create(gpumat, psl->probe_background);
						DRW_shgroup_uniform_float(grp, "backgroundAlpha", &stl->g_data->background_alpha, 1);
						/* TODO (fclem): remove those (need to clean the GLSL files). */
						DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
						DRW_shgroup_uniform_block(grp, "grid_block", sldata->grid_ubo);
						DRW_shgroup_uniform_block(grp, "probe_block", sldata->probe_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_call_add(grp, geom, NULL);
						break;
					default:
						col = error_col;
						break;
				}
			}
		}

		/* Fallback if shader fails or if not using nodetree. */
		if (grp == NULL) {
			grp = DRW_shgroup_create(EEVEE_shaders_probe_default_sh_get(), psl->probe_background);
			DRW_shgroup_uniform_vec3(grp, "color", col, 1);
			DRW_shgroup_uniform_float(grp, "backgroundAlpha", &stl->g_data->background_alpha, 1);
			DRW_shgroup_call_add(grp, geom, NULL);
		}
	}

	if (DRW_state_draw_support() && !LOOK_DEV_STUDIO_LIGHT_ENABLED(draw_ctx->v3d)) {
		DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_CULL_BACK;
		psl->probe_display = DRW_pass_create("LightProbe Display", state);

		/* Cube Display */
		if (scene_eval->eevee.flag & SCE_EEVEE_SHOW_CUBEMAPS && lcache->cube_len > 1) {
			int cube_len = lcache->cube_len - 1; /* don't count the world. */
			DRWShadingGroup *grp = DRW_shgroup_empty_tri_batch_create(
			        EEVEE_shaders_probe_cube_display_sh_get(), psl->probe_display, cube_len * 2);

			DRW_shgroup_uniform_texture_ref(grp, "probeCubes", &lcache->cube_tx.tex);
			DRW_shgroup_uniform_block(grp, "probe_block", sldata->probe_ubo);
			DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
			DRW_shgroup_uniform_vec3(grp, "screen_vecs[0]", DRW_viewport_screenvecs_get(), 2);
			DRW_shgroup_uniform_float_copy(grp, "sphere_size", scene_eval->eevee.gi_cubemap_draw_size * 0.5f);
			/* TODO (fclem) get rid of those UBO. */
			DRW_shgroup_uniform_block(grp, "planar_block", sldata->planar_ubo);
			DRW_shgroup_uniform_block(grp, "grid_block", sldata->grid_ubo);
		}

		/* Grid Display */
		if (scene_eval->eevee.flag & SCE_EEVEE_SHOW_IRRADIANCE) {
			EEVEE_LightGrid *egrid = lcache->grid_data + 1;
			for (int p = 1; p < lcache->grid_len; ++p, egrid++) {
				DRWShadingGroup *shgrp = DRW_shgroup_create(
				        EEVEE_shaders_probe_grid_display_sh_get(), psl->probe_display);

				DRW_shgroup_uniform_int(shgrp, "offset", &egrid->offset, 1);
				DRW_shgroup_uniform_ivec3(shgrp, "grid_resolution", egrid->resolution, 1);
				DRW_shgroup_uniform_vec3(shgrp, "corner", egrid->corner, 1);
				DRW_shgroup_uniform_vec3(shgrp, "increment_x", egrid->increment_x, 1);
				DRW_shgroup_uniform_vec3(shgrp, "increment_y", egrid->increment_y, 1);
				DRW_shgroup_uniform_vec3(shgrp, "increment_z", egrid->increment_z, 1);
				DRW_shgroup_uniform_vec3(shgrp, "screen_vecs[0]", DRW_viewport_screenvecs_get(), 2);
				DRW_shgroup_uniform_texture_ref(shgrp, "irradianceGrid", &lcache->grid_tx.tex);
				DRW_shgroup_uniform_float_copy(shgrp, "sphere_size", scene_eval->eevee.gi_irradiance_draw_size * 0.5f);
				/* TODO (fclem) get rid of those UBO. */
				DRW_shgroup_uniform_block(shgrp, "probe_block", sldata->probe_ubo);
				DRW_shgroup_uniform_block(shgrp, "planar_block", sldata->planar_ubo);
				DRW_shgroup_uniform_block(shgrp, "grid_block", sldata->grid_ubo);
				DRW_shgroup_uniform_block(shgrp, "common_block", sldata->common_ubo);
				int tri_count = egrid->resolution[0] * egrid->resolution[1] * egrid->resolution[2] * 2;
				DRW_shgroup_call_procedural_triangles_add(shgrp, tri_count, NULL);
			}
		}

		/* Planar Display */
		DRW_shgroup_instance_format(e_data.format_probe_display_planar, {
		    {"probe_id", DRW_ATTR_INT, 1},
		    {"probe_mat", DRW_ATTR_FLOAT, 16},
		});

		DRWShadingGroup *grp = DRW_shgroup_instance_create(
		        EEVEE_shaders_probe_planar_display_sh_get(),
		        psl->probe_display,
		        DRW_cache_quad_get(),
		        e_data.format_probe_display_planar);
		stl->g_data->planar_display_shgrp = grp;
		DRW_shgroup_uniform_texture_ref(grp, "probePlanars", &txl->planar_pool);
	}
	else {
		stl->g_data->planar_display_shgrp = NULL;
	}

	{
		psl->probe_planar_downsample_ps = DRW_pass_create("LightProbe Planar Downsample", DRW_STATE_WRITE_COLOR);

		DRWShadingGroup *grp = DRW_shgroup_create(
		        EEVEE_shaders_probe_planar_downsample_sh_get(), psl->probe_planar_downsample_ps);

		DRW_shgroup_uniform_texture_ref(grp, "source", &txl->planar_pool);
		DRW_shgroup_uniform_float(grp, "fireflyFactor", &sldata->common_data.ssr_firefly_fac, 1);
		DRW_shgroup_call_instances_add(grp, DRW_cache_fullscreen_quad_get(), NULL, (uint *)&pinfo->num_planar);
	}
}

static bool eevee_lightprobes_culling_test(Object *ob)
{
	LightProbe *probe = (LightProbe *)ob->data;

	switch (probe->type) {
		case LIGHTPROBE_TYPE_PLANAR:
		{
			/* See if this planar probe is inside the view frustum. If not, no need to update it. */
			/* NOTE: this could be bypassed if we want feedback loop mirrors for rendering. */
			BoundBox bbox; float tmp[4][4];
			const float min[3] = {-1.0f, -1.0f, -1.0f};
			const float max[3] = { 1.0f,  1.0f,  1.0f};
			BKE_boundbox_init_from_minmax(&bbox, min, max);

			copy_m4_m4(tmp, ob->obmat);
			normalize_v3(tmp[2]);
			mul_v3_fl(tmp[2], probe->distinf);

			for (int v = 0; v < 8; ++v) {
				mul_m4_v3(tmp, bbox.vec[v]);
			}
			return DRW_culling_box_test(&bbox);
		}
		case LIGHTPROBE_TYPE_CUBE:
			return true; /* TODO */
		case LIGHTPROBE_TYPE_GRID:
			return true; /* TODO */
	}
	BLI_assert(0);
	return true;
}

void EEVEE_lightprobes_cache_add(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata, Object *ob)
{
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	LightProbe *probe = (LightProbe *)ob->data;

	if ((probe->type == LIGHTPROBE_TYPE_CUBE && pinfo->num_cube >= MAX_PROBE) ||
	    (probe->type == LIGHTPROBE_TYPE_GRID && pinfo->num_grid >= MAX_PROBE) ||
	    (probe->type == LIGHTPROBE_TYPE_PLANAR && pinfo->num_planar >= MAX_PLANAR))
	{
		printf("Too many probes in the view !!!\n");
		return;
	}

	if (probe->type == LIGHTPROBE_TYPE_PLANAR) {
		if (!eevee_lightprobes_culling_test(ob)) {
			return; /* Culled */
		}
		EEVEE_lightprobes_planar_data_from_object(ob,
		                                          &pinfo->planar_data[pinfo->num_planar],
		                                          &pinfo->planar_vis_tests[pinfo->num_planar]);
		/* Debug Display */
		DRWShadingGroup *grp = vedata->stl->g_data->planar_display_shgrp;
		if (grp && (probe->flag & LIGHTPROBE_FLAG_SHOW_DATA)) {
			DRW_shgroup_call_dynamic_add(grp, &pinfo->num_planar, ob->obmat);
		}

		pinfo->num_planar++;
	}
	else {
		EEVEE_LightProbeEngineData *ped = EEVEE_lightprobe_data_ensure(ob);
		if (ped->need_update) {
			if (probe->type == LIGHTPROBE_TYPE_GRID) {
				pinfo->do_grid_update = true;
			}
			else {
				pinfo->do_cube_update = true;
			}
			ped->need_update = false;
		}
	}
}

void EEVEE_lightprobes_grid_data_from_object(Object *ob, EEVEE_LightGrid *egrid, int *offset)
{
	LightProbe *probe = (LightProbe *)ob->data;

	copy_v3_v3_int(egrid->resolution, &probe->grid_resolution_x);

	/* Save current offset and advance it for the next grid. */
	egrid->offset = *offset;
	*offset += egrid->resolution[0] * egrid->resolution[1] * egrid->resolution[2];

	/* Add one for level 0 */
	float fac = 1.0f / max_ff(1e-8f, probe->falloff);
	egrid->attenuation_scale = fac / max_ff(1e-8f, probe->distinf);
	egrid->attenuation_bias = fac;

	/* Update transforms */
	float cell_dim[3], half_cell_dim[3];
	cell_dim[0] = 2.0f / egrid->resolution[0];
	cell_dim[1] = 2.0f / egrid->resolution[1];
	cell_dim[2] = 2.0f / egrid->resolution[2];

	mul_v3_v3fl(half_cell_dim, cell_dim, 0.5f);

	/* Matrix converting world space to cell ranges. */
	invert_m4_m4(egrid->mat, ob->obmat);

	/* First cell. */
	copy_v3_fl(egrid->corner, -1.0f);
	add_v3_v3(egrid->corner, half_cell_dim);
	mul_m4_v3(ob->obmat, egrid->corner);

	/* Opposite neighbor cell. */
	copy_v3_fl3(egrid->increment_x, cell_dim[0], 0.0f, 0.0f);
	add_v3_v3(egrid->increment_x, half_cell_dim);
	add_v3_fl(egrid->increment_x, -1.0f);
	mul_m4_v3(ob->obmat, egrid->increment_x);
	sub_v3_v3(egrid->increment_x, egrid->corner);

	copy_v3_fl3(egrid->increment_y, 0.0f, cell_dim[1], 0.0f);
	add_v3_v3(egrid->increment_y, half_cell_dim);
	add_v3_fl(egrid->increment_y, -1.0f);
	mul_m4_v3(ob->obmat, egrid->increment_y);
	sub_v3_v3(egrid->increment_y, egrid->corner);

	copy_v3_fl3(egrid->increment_z, 0.0f, 0.0f, cell_dim[2]);
	add_v3_v3(egrid->increment_z, half_cell_dim);
	add_v3_fl(egrid->increment_z, -1.0f);
	mul_m4_v3(ob->obmat, egrid->increment_z);
	sub_v3_v3(egrid->increment_z, egrid->corner);

	/* Visibility bias */
	egrid->visibility_bias = 0.05f * probe->vis_bias;
	egrid->visibility_bleed = probe->vis_bleedbias;
	egrid->visibility_range = 1.0f + sqrtf(max_fff(len_squared_v3(egrid->increment_x),
	                                               len_squared_v3(egrid->increment_y),
	                                               len_squared_v3(egrid->increment_z)));
}

void EEVEE_lightprobes_cube_data_from_object(Object *ob, EEVEE_LightProbe *eprobe)
{
	LightProbe *probe = (LightProbe *)ob->data;

	/* Update transforms */
	copy_v3_v3(eprobe->position, ob->obmat[3]);

	/* Attenuation */
	eprobe->attenuation_type = probe->attenuation_type;
	eprobe->attenuation_fac = 1.0f / max_ff(1e-8f, probe->falloff);

	unit_m4(eprobe->attenuationmat);
	scale_m4_fl(eprobe->attenuationmat, probe->distinf);
	mul_m4_m4m4(eprobe->attenuationmat, ob->obmat, eprobe->attenuationmat);
	invert_m4(eprobe->attenuationmat);

	/* Parallax */
	unit_m4(eprobe->parallaxmat);

	if ((probe->flag & LIGHTPROBE_FLAG_CUSTOM_PARALLAX) != 0) {
		eprobe->parallax_type = probe->parallax_type;
		scale_m4_fl(eprobe->parallaxmat, probe->distpar);
	}
	else {
		eprobe->parallax_type = probe->attenuation_type;
		scale_m4_fl(eprobe->parallaxmat, probe->distinf);
	}

	mul_m4_m4m4(eprobe->parallaxmat, ob->obmat, eprobe->parallaxmat);
	invert_m4(eprobe->parallaxmat);
}

void EEVEE_lightprobes_planar_data_from_object(Object *ob, EEVEE_PlanarReflection *eplanar, EEVEE_LightProbeVisTest *vis_test)
{
	LightProbe *probe = (LightProbe *)ob->data;
	float normat[4][4], imat[4][4];

	vis_test->collection = probe->visibility_grp;
	vis_test->invert = probe->flag & LIGHTPROBE_FLAG_INVERT_GROUP;
	vis_test->cached = false;

	/* Computing mtx : matrix that mirror position around object's XY plane. */
	normalize_m4_m4(normat, ob->obmat);  /* object > world */
	invert_m4_m4(imat, normat); /* world > object */
	/* XY reflection plane */
	imat[0][2] = -imat[0][2];
	imat[1][2] = -imat[1][2];
	imat[2][2] = -imat[2][2];
	imat[3][2] = -imat[3][2]; /* world > object > mirrored obj */
	mul_m4_m4m4(eplanar->mtx, normat, imat); /* world > object > mirrored obj > world */

	/* Compute clip plane equation / normal. */
	copy_v3_v3(eplanar->plane_equation, ob->obmat[2]);
	normalize_v3(eplanar->plane_equation); /* plane normal */
	eplanar->plane_equation[3] = -dot_v3v3(eplanar->plane_equation, ob->obmat[3]);
	eplanar->clipsta = probe->clipsta;

	/* Compute XY clip planes. */
	normalize_v3_v3(eplanar->clip_vec_x, ob->obmat[0]);
	normalize_v3_v3(eplanar->clip_vec_y, ob->obmat[1]);

	float vec[3] = {0.0f, 0.0f, 0.0f};
	vec[0] = 1.0f; vec[1] = 0.0f; vec[2] = 0.0f;
	mul_m4_v3(ob->obmat, vec); /* Point on the edge */
	eplanar->clip_edge_x_pos = dot_v3v3(eplanar->clip_vec_x, vec);

	vec[0] = 0.0f; vec[1] = 1.0f; vec[2] = 0.0f;
	mul_m4_v3(ob->obmat, vec); /* Point on the edge */
	eplanar->clip_edge_y_pos = dot_v3v3(eplanar->clip_vec_y, vec);

	vec[0] = -1.0f; vec[1] = 0.0f; vec[2] = 0.0f;
	mul_m4_v3(ob->obmat, vec); /* Point on the edge */
	eplanar->clip_edge_x_neg = dot_v3v3(eplanar->clip_vec_x, vec);

	vec[0] = 0.0f; vec[1] = -1.0f; vec[2] = 0.0f;
	mul_m4_v3(ob->obmat, vec); /* Point on the edge */
	eplanar->clip_edge_y_neg = dot_v3v3(eplanar->clip_vec_y, vec);

	/* Facing factors */
	float max_angle = max_ff(1e-2f, 1.0f - probe->falloff) * M_PI * 0.5f;
	float min_angle = 0.0f;
	eplanar->facing_scale = 1.0f / max_ff(1e-8f, cosf(min_angle) - cosf(max_angle));
	eplanar->facing_bias = -min_ff(1.0f - 1e-8f, cosf(max_angle)) * eplanar->facing_scale;

	/* Distance factors */
	float max_dist = probe->distinf;
	float min_dist = min_ff(1.0f - 1e-8f, 1.0f - probe->falloff) * probe->distinf;
	eplanar->attenuation_scale = -1.0f / max_ff(1e-8f, max_dist - min_dist);
	eplanar->attenuation_bias = max_dist * -eplanar->attenuation_scale;
}

static void lightbake_planar_compute_render_matrices(
        EEVEE_PlanarReflection *eplanar, DRWMatrixState *r_matstate,
        const float viewmat[4][4], const float winmat[4][4])
{
	/* Reflect Camera Matrix. */
	mul_m4_m4m4(r_matstate->viewmat, viewmat, eplanar->mtx);
	/* Invert X to avoid flipping the triangle facing direction. */
	r_matstate->viewmat[0][0] = -r_matstate->viewmat[0][0];
	r_matstate->viewmat[1][0] = -r_matstate->viewmat[1][0];
	r_matstate->viewmat[2][0] = -r_matstate->viewmat[2][0];
	r_matstate->viewmat[3][0] = -r_matstate->viewmat[3][0];
	/* Apply Projection Matrix. */
	/* Temporal sampling jitter should be already applied to the DRW_MAT_WIN. */
	mul_m4_m4m4(r_matstate->persmat, winmat, r_matstate->viewmat);
}

static void eevee_lightprobes_extract_from_cache(EEVEE_LightProbesInfo *pinfo, LightCache *lcache)
{
	/* copy the entire cache for now (up to MAX_PROBE) */
	/* TODO Frutum cull to only add visible probes. */
	memcpy(pinfo->probe_data, lcache->cube_data, sizeof(EEVEE_LightProbe) * max_ii(1, min_ii(lcache->cube_len, MAX_PROBE)));
	/* TODO compute the max number of grid based on sample count. */
	memcpy(pinfo->grid_data, lcache->grid_data, sizeof(EEVEE_LightGrid) * max_ii(1, min_ii(lcache->grid_len, MAX_GRID)));
}

void EEVEE_lightprobes_cache_finish(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
	EEVEE_StorageList *stl = vedata->stl;
	LightCache *light_cache = stl->g_data->light_cache;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	const DRWContextState *draw_ctx = DRW_context_state_get();
	const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);

	eevee_lightprobes_extract_from_cache(sldata->probes, light_cache);

	DRW_uniformbuffer_update(sldata->probe_ubo, &sldata->probes->probe_data);
	DRW_uniformbuffer_update(sldata->grid_ubo, &sldata->probes->grid_data);

	/* For shading, save max level of the octahedron map */
	sldata->common_data.prb_lod_cube_max = (float)light_cache->mips_len - 1.0f;
	sldata->common_data.prb_lod_planar_max = (float)MAX_PLANAR_LOD_LEVEL;
	sldata->common_data.prb_irradiance_vis_size = light_cache->vis_res;
	sldata->common_data.prb_irradiance_smooth = SQUARE(scene_eval->eevee.gi_irradiance_smoothing);
	sldata->common_data.prb_num_render_cube = max_ii(1, light_cache->cube_len);
	sldata->common_data.prb_num_render_grid = max_ii(1, light_cache->grid_len);
	sldata->common_data.prb_num_planar = pinfo->num_planar;

	if (pinfo->num_planar != pinfo->cache_num_planar) {
		DRW_TEXTURE_FREE_SAFE(vedata->txl->planar_pool);
		DRW_TEXTURE_FREE_SAFE(vedata->txl->planar_depth);
		pinfo->cache_num_planar = pinfo->num_planar;
	}
	planar_pool_ensure_alloc(vedata, pinfo->num_planar);

	/* If lightcache auto-update is enable we tag the relevant part
	 * of the cache to update and fire up a baking job. */
	if (!DRW_state_is_image_render() && !DRW_state_is_opengl_render() &&
	    (pinfo->do_grid_update || pinfo->do_cube_update))
	{
		BLI_assert(draw_ctx->evil_C);

		if (draw_ctx->scene->eevee.flag & SCE_EEVEE_GI_AUTOBAKE) {
			Scene *scene_orig = DEG_get_input_scene(draw_ctx->depsgraph);
			if (scene_orig->eevee.light_cache != NULL) {
				if (pinfo->do_grid_update) {
					scene_orig->eevee.light_cache->flag |= LIGHTCACHE_UPDATE_GRID;
				}
				/* If we update grid we need to update the cubemaps too.
				 * So always refresh cubemaps. */
				scene_orig->eevee.light_cache->flag |= LIGHTCACHE_UPDATE_CUBE;
				/* Tag the lightcache to auto update. */
				scene_orig->eevee.light_cache->flag |= LIGHTCACHE_UPDATE_AUTO;
				/* Use a notifier to trigger the operator after drawing. */
				WM_event_add_notifier(draw_ctx->evil_C, NC_LIGHTPROBE, scene_orig);
			}
		}
	}
}

/* -------------------------------------------------------------------- */
/** \name Rendering
 * \{ */

typedef struct EEVEE_BakeRenderData {
	EEVEE_Data *vedata;
	EEVEE_ViewLayerData *sldata;
	struct GPUFrameBuffer **face_fb; /* should contain 6 framebuffer */
} EEVEE_BakeRenderData;

static void render_cubemap(
        void (*callback)(int face, EEVEE_BakeRenderData *user_data), EEVEE_BakeRenderData *user_data,
        const float pos[3], float clipsta, float clipend)
{
	DRWMatrixState matstate;

	/* Move to capture position */
	float posmat[4][4];
	unit_m4(posmat);
	negate_v3_v3(posmat[3], pos);

	perspective_m4(matstate.winmat, -clipsta, clipsta, -clipsta, clipsta, clipsta, clipend);
	invert_m4_m4(matstate.wininv, matstate.winmat);

	/* 1 - Render to each cubeface individually.
	 * We do this instead of using geometry shader because a) it's faster,
	 * b) it's easier than fixing the nodetree shaders (for view dependent effects). */
	for (int i = 0; i < 6; ++i) {
		/* Setup custom matrices */
		mul_m4_m4m4(matstate.viewmat, cubefacemat[i], posmat);
		mul_m4_m4m4(matstate.persmat, matstate.winmat, matstate.viewmat);
		invert_m4_m4(matstate.persinv, matstate.persmat);
		invert_m4_m4(matstate.viewinv, matstate.viewmat);
		invert_m4_m4(matstate.wininv, matstate.winmat);

		DRW_viewport_matrix_override_set_all(&matstate);

		callback(i, user_data);
	}
}

static void render_reflections(
        void (*callback)(int face, EEVEE_BakeRenderData *user_data), EEVEE_BakeRenderData *user_data,
        EEVEE_PlanarReflection *planar_data, int ref_count)
{
	DRWMatrixState matstate;

	float original_viewmat[4][4], original_winmat[4][4];
	DRW_viewport_matrix_get(original_viewmat, DRW_MAT_VIEW);
	DRW_viewport_matrix_get(original_winmat, DRW_MAT_WIN);

	for (int i = 0; i < ref_count; ++i) {
		/* Setup custom matrices */
		lightbake_planar_compute_render_matrices(planar_data + i, &matstate, original_viewmat, original_winmat);
		invert_m4_m4(matstate.persinv, matstate.persmat);
		invert_m4_m4(matstate.viewinv, matstate.viewmat);
		invert_m4_m4(matstate.wininv, matstate.winmat);
		DRW_viewport_matrix_override_set_all(&matstate);

		callback(i, user_data);
	}
}

static void lightbake_render_world_face(int face, EEVEE_BakeRenderData *user_data)
{
	EEVEE_PassList *psl = user_data->vedata->psl;
	struct GPUFrameBuffer **face_fb = user_data->face_fb;

	/* For world probe, we don't need to clear the color buffer
	 * since we render the background directly. */
	GPU_framebuffer_bind(face_fb[face]);
	GPU_framebuffer_clear_depth(face_fb[face], 1.0f);
	DRW_draw_pass(psl->probe_background);
}

void EEVEE_lightbake_render_world(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata, struct GPUFrameBuffer *face_fb[6])
{
	EEVEE_BakeRenderData brdata = {
		.vedata = vedata,
		.face_fb = face_fb,
	};

	render_cubemap(lightbake_render_world_face, &brdata, (float[3]){0.0f}, 1.0f, 10.0f);
}

static void lightbake_render_scene_face(int face, EEVEE_BakeRenderData *user_data)
{
	EEVEE_ViewLayerData *sldata = user_data->sldata;
	EEVEE_PassList *psl = user_data->vedata->psl;
	struct GPUFrameBuffer **face_fb = user_data->face_fb;

	/* Be sure that cascaded shadow maps are updated. */
	EEVEE_draw_shadows(sldata, user_data->vedata);

	GPU_framebuffer_bind(face_fb[face]);
	GPU_framebuffer_clear_depth(face_fb[face], 1.0f);

	DRW_draw_pass(psl->depth_pass);
	DRW_draw_pass(psl->depth_pass_cull);
	DRW_draw_pass(psl->probe_background);
	DRW_draw_pass(psl->material_pass);
	DRW_draw_pass(psl->sss_pass); /* Only output standard pass */
	EEVEE_draw_default_passes(psl);
}

/* Render the scene to the probe_rt texture. */
void EEVEE_lightbake_render_scene(
        EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata, struct GPUFrameBuffer *face_fb[6],
        const float pos[3], float near_clip, float far_clip)
{
	EEVEE_BakeRenderData brdata = {
		.vedata = vedata,
		.sldata = sldata,
		.face_fb = face_fb,
	};

	render_cubemap(lightbake_render_scene_face, &brdata, pos, near_clip, far_clip);
}

static void lightbake_render_scene_reflected(int layer, EEVEE_BakeRenderData *user_data)
{
	EEVEE_Data *vedata = user_data->vedata;
	EEVEE_ViewLayerData *sldata = user_data->sldata;
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_TextureList *txl = vedata->txl;
	EEVEE_FramebufferList *fbl = vedata->fbl;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	EEVEE_PlanarReflection *eplanar = pinfo->planar_data + layer;

	GPU_framebuffer_ensure_config(&fbl->planarref_fb, {
		GPU_ATTACHMENT_TEXTURE_LAYER(txl->planar_depth, layer),
		GPU_ATTACHMENT_TEXTURE_LAYER(txl->planar_pool, layer)
	});

	/* Use visibility info for this planar reflection. */
	pinfo->vis_data = pinfo->planar_vis_tests[layer];

	/* Avoid using the texture attached to framebuffer when rendering. */
	/* XXX */
	GPUTexture *tmp_planar_pool = txl->planar_pool;
	GPUTexture *tmp_planar_depth = txl->planar_depth;
	txl->planar_pool = e_data.planar_pool_placeholder;
	txl->planar_depth = e_data.depth_array_placeholder;

	/* Be sure that cascaded shadow maps are updated. */
	DRW_stats_group_start("Planar Reflection");

	/* Be sure that cascaded shadow maps are updated. */
	EEVEE_draw_shadows(sldata, vedata);

	/* Compute offset plane equation (fix missing texels near reflection plane). */
	copy_v4_v4(sldata->clip_data.clip_planes[0], eplanar->plane_equation);
	sldata->clip_data.clip_planes[0][3] += eplanar->clipsta;
	/* Set clipping plane */
	DRW_uniformbuffer_update(sldata->clip_ubo, &sldata->clip_data);
	DRW_state_clip_planes_len_set(1);

	GPU_framebuffer_bind(fbl->planarref_fb);
	GPU_framebuffer_clear_depth(fbl->planarref_fb, 1.0);

	/* Slight modification: we handle refraction as normal
	 * shading and don't do SSRefraction. */

	DRW_draw_pass(psl->depth_pass_clip);
	DRW_draw_pass(psl->depth_pass_clip_cull);
	DRW_draw_pass(psl->refract_depth_pass);
	DRW_draw_pass(psl->refract_depth_pass_cull);

	DRW_draw_pass(psl->probe_background);
	EEVEE_create_minmax_buffer(vedata, tmp_planar_depth, layer);
	EEVEE_occlusion_compute(sldata, vedata, tmp_planar_depth, layer);

	GPU_framebuffer_bind(fbl->planarref_fb);

	/* Shading pass */
	EEVEE_draw_default_passes(psl);
	DRW_draw_pass(psl->material_pass);
	DRW_draw_pass(psl->sss_pass); /* Only output standard pass */
	DRW_draw_pass(psl->refract_pass);

	/* Transparent */
	if (DRW_state_is_image_render()) {
		/* Do the reordering only for offline because it can be costly. */
		DRW_pass_sort_shgroup_z(psl->transparent_pass);
	}
	DRW_draw_pass(psl->transparent_pass);

	DRW_state_clip_planes_reset();

	DRW_stats_group_end();

	/* Restore */
	txl->planar_pool = tmp_planar_pool;
	txl->planar_depth = tmp_planar_depth;
}

static void eevee_lightbake_render_scene_to_planars(
        EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
	EEVEE_BakeRenderData brdata = {
		.vedata = vedata,
		.sldata = sldata,
	};

	render_reflections(lightbake_render_scene_reflected, &brdata, sldata->probes->planar_data, sldata->probes->num_planar);
}
/** \} */

/* -------------------------------------------------------------------- */
/** \name Filtering
 * \{ */

/* Glossy filter rt_color to light_cache->cube_tx.tex at index probe_idx */
void EEVEE_lightbake_filter_glossy(
        EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata,
        struct GPUTexture *rt_color, struct GPUFrameBuffer *fb,
        int probe_idx, float intensity, int maxlevel, float filter_quality, float firefly_fac)
{
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	LightCache *light_cache = vedata->stl->g_data->light_cache;

	float target_size = (float)GPU_texture_width(rt_color);

	/* Max lod used from the render target probe */
	pinfo->lod_rt_max = floorf(log2f(target_size)) - 2.0f;
	pinfo->intensity_fac = intensity;

	/* Start fresh */
	GPU_framebuffer_ensure_config(&fb, {
		GPU_ATTACHMENT_NONE,
		GPU_ATTACHMENT_NONE
	});

	/* 2 - Let gpu create Mipmaps for Filtered Importance Sampling. */
	/* Bind next framebuffer to be able to gen. mips for probe_rt. */
	EEVEE_downsample_cube_buffer(vedata, rt_color, (int)(pinfo->lod_rt_max));

	/* 3 - Render to probe array to the specified layer, do prefiltering. */
	int mipsize = GPU_texture_width(light_cache->cube_tx.tex);
	for (int i = 0; i < maxlevel + 1; i++) {
		float bias = (i == 0) ? -1.0f : 1.0f;
		pinfo->texel_size = 1.0f / (float)mipsize;
		pinfo->padding_size = (i == maxlevel) ? 0 : (float)(1 << (maxlevel - i - 1));
		pinfo->padding_size *= pinfo->texel_size;
		pinfo->layer = probe_idx;
		pinfo->roughness = i / (float)maxlevel;
		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_len = 1.0f; break;
			case 1: pinfo->samples_len = 16.0f; break;
			case 2: pinfo->samples_len = 32.0f; break;
			case 3: pinfo->samples_len = 64.0f; break;
			default: pinfo->samples_len = 128.0f; break;
		}
#else /* Constant Sample count (slow) */
		pinfo->samples_len = 1024.0f;
#endif
		/* Cannot go higher than HAMMERSLEY_SIZE */
		CLAMP(filter_quality, 1.0f, 8.0f);
		pinfo->samples_len *= filter_quality;

		pinfo->samples_len_inv = 1.0f / pinfo->samples_len;
		pinfo->lodfactor = bias + 0.5f * log((float)(target_size * target_size) * pinfo->samples_len_inv) / log(2);
		pinfo->firefly_fac = (firefly_fac > 0.0) ? firefly_fac : 1e16;

		GPU_framebuffer_ensure_config(&fb, {
			GPU_ATTACHMENT_NONE,
			GPU_ATTACHMENT_TEXTURE_MIP(light_cache->cube_tx.tex, i)
		});
		GPU_framebuffer_bind(fb);
		GPU_framebuffer_viewport_set(fb, 0, 0, mipsize, mipsize);
		DRW_draw_pass(psl->probe_glossy_compute);

		mipsize /= 2;
		CLAMP_MIN(mipsize, 1);
	}
}

/* Diffuse filter rt_color to light_cache->grid_tx.tex at index grid_offset */
void EEVEE_lightbake_filter_diffuse(
        EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata,
        struct GPUTexture *rt_color, struct GPUFrameBuffer *fb,
        int grid_offset, float intensity)
{
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	LightCache *light_cache = vedata->stl->g_data->light_cache;

	float target_size = (float)GPU_texture_width(rt_color);

	pinfo->intensity_fac = intensity;

	/* find cell position on the virtual 3D texture */
	/* NOTE : Keep in sync with load_irradiance_cell() */
#if defined(IRRADIANCE_SH_L2)
	int size[2] = {3, 3};
#elif defined(IRRADIANCE_CUBEMAP)
	int size[2] = {8, 8};
	pinfo->samples_len = 1024.0f;
#elif defined(IRRADIANCE_HL2)
	int size[2] = {3, 2};
	pinfo->samples_len = 1024.0f;
#endif

	int cell_per_row = GPU_texture_width(light_cache->grid_tx.tex) / size[0];
	int x = size[0] * (grid_offset % cell_per_row);
	int y = size[1] * (grid_offset / cell_per_row);

#ifndef IRRADIANCE_SH_L2
	/* Tweaking parameters to balance perf. vs precision */
	const float bias = 0.0f;
	pinfo->samples_len_inv = 1.0f / pinfo->samples_len;
	pinfo->lodfactor = bias + 0.5f * log((float)(target_size * target_size) * pinfo->samples_len_inv) / log(2);
	pinfo->lod_rt_max = floorf(log2f(target_size)) - 2.0f;
#else
	pinfo->shres = 32; /* Less texture fetches & reduce branches */
	pinfo->lod_rt_max = 2.0f; /* Improve cache reuse */
#endif

	/* Start fresh */
	GPU_framebuffer_ensure_config(&fb, {
		GPU_ATTACHMENT_NONE,
		GPU_ATTACHMENT_NONE
	});

	/* 4 - Compute diffuse irradiance */
	EEVEE_downsample_cube_buffer(vedata, rt_color, (int)(pinfo->lod_rt_max));

	GPU_framebuffer_ensure_config(&fb, {
		GPU_ATTACHMENT_NONE,
		GPU_ATTACHMENT_TEXTURE_LAYER(light_cache->grid_tx.tex, 0)
	});
	GPU_framebuffer_bind(fb);
	GPU_framebuffer_viewport_set(fb, x, y, size[0], size[1]);
	DRW_draw_pass(psl->probe_diffuse_compute);
}

/* Filter rt_depth to light_cache->grid_tx.tex at index grid_offset */
void EEVEE_lightbake_filter_visibility(
        EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata,
        struct GPUTexture *UNUSED(rt_depth), struct GPUFrameBuffer *fb,
        int grid_offset, float clipsta, float clipend,
        float vis_range, float vis_blur, int vis_size)
{
	EEVEE_PassList *psl = vedata->psl;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	LightCache *light_cache = vedata->stl->g_data->light_cache;

	pinfo->samples_len = 512.0f; /* TODO refine */
	pinfo->samples_len_inv = 1.0f / pinfo->samples_len;
	pinfo->shres = vis_size;
	pinfo->visibility_range = vis_range;
	pinfo->visibility_blur = vis_blur;
	pinfo->near_clip = -clipsta;
	pinfo->far_clip = -clipend;
	pinfo->texel_size = 1.0f / (float)vis_size;

	int cell_per_col = GPU_texture_height(light_cache->grid_tx.tex) / vis_size;
	int cell_per_row = GPU_texture_width(light_cache->grid_tx.tex) / vis_size;
	int x = vis_size * (grid_offset % cell_per_row);
	int y = vis_size * ((grid_offset / cell_per_row) % cell_per_col);
	int layer = 1 + ((grid_offset / cell_per_row) / cell_per_col);

	GPU_framebuffer_ensure_config(&fb, {
		GPU_ATTACHMENT_NONE,
		GPU_ATTACHMENT_TEXTURE_LAYER(light_cache->grid_tx.tex, layer)
	});
	GPU_framebuffer_bind(fb);
	GPU_framebuffer_viewport_set(fb, x, y, vis_size, vis_size);
	DRW_draw_pass(psl->probe_visibility_compute);
}

/* Actually a simple downsampling */
static void downsample_planar(void *vedata, int level)
{
	EEVEE_PassList *psl = ((EEVEE_Data *)vedata)->psl;
	EEVEE_StorageList *stl = ((EEVEE_Data *)vedata)->stl;

	const float *size = DRW_viewport_size_get();
	copy_v2_v2(stl->g_data->planar_texel_size, size);
	for (int i = 0; i < level - 1; ++i) {
		stl->g_data->planar_texel_size[0] /= 2.0f;
		stl->g_data->planar_texel_size[1] /= 2.0f;
		min_ff(floorf(stl->g_data->planar_texel_size[0]), 1.0f);
		min_ff(floorf(stl->g_data->planar_texel_size[1]), 1.0f);
	}
	invert_v2(stl->g_data->planar_texel_size);

	DRW_draw_pass(psl->probe_planar_downsample_ps);
}

static void EEVEE_lightbake_filter_planar(EEVEE_Data *vedata)
{
	EEVEE_TextureList *txl = vedata->txl;
	EEVEE_FramebufferList  *fbl = vedata->fbl;

	DRW_stats_group_start("Planar Probe Downsample");

	GPU_framebuffer_ensure_config(&fbl->planar_downsample_fb, {
		GPU_ATTACHMENT_NONE,
		GPU_ATTACHMENT_TEXTURE(txl->planar_pool)
	});

	GPU_framebuffer_recursive_downsample(fbl->planar_downsample_fb, MAX_PLANAR_LOD_LEVEL, &downsample_planar, vedata);
	DRW_stats_group_end();
}

/** \} */

void EEVEE_lightprobes_refresh_planar(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
	EEVEE_CommonUniformBuffer *common_data = &sldata->common_data;
	EEVEE_LightProbesInfo *pinfo = sldata->probes;
	DRWMatrixState saved_mats;

	if (pinfo->num_planar == 0) {
		/* Disable SSR if we cannot read previous frame */
		common_data->ssr_toggle = vedata->stl->g_data->valid_double_buffer;
		common_data->prb_num_planar = 0;
		return;
	}

	/* We need to save the Matrices before overidding them */
	DRW_viewport_matrix_get_all(&saved_mats);

	/* Temporary Remove all planar reflections (avoid lag effect). */
	common_data->prb_num_planar = 0;
	/* Turn off ssr to avoid black specular */
	common_data->ssr_toggle = false;
	common_data->sss_toggle = false;

	common_data->ray_type = EEVEE_RAY_GLOSSY;
	common_data->ray_depth = 1.0f;
	DRW_uniformbuffer_update(sldata->common_ubo, &sldata->common_data);

	/* Rendering happens here! */
	eevee_lightbake_render_scene_to_planars(sldata, vedata);

	/* Make sure no aditionnal visibility check runs after this. */
	pinfo->vis_data.collection = NULL;

	DRW_uniformbuffer_update(sldata->planar_ubo, &sldata->probes->planar_data);

	/* Restore */
	common_data->prb_num_planar = pinfo->num_planar;
	common_data->ssr_toggle = true;
	common_data->sss_toggle = true;

	/* Prefilter for SSR */
	if ((vedata->stl->effects->enabled_effects & EFFECT_SSR) != 0) {
		EEVEE_lightbake_filter_planar(vedata);
	}

	DRW_viewport_matrix_override_set_all(&saved_mats);

	if (DRW_state_is_image_render()) {
		/* Sort transparents because planar reflections could have re-sorted them. */
		DRW_pass_sort_shgroup_z(vedata->psl->transparent_pass);
	}

	/* Disable SSR if we cannot read previous frame */
	common_data->ssr_toggle = vedata->stl->g_data->valid_double_buffer;
}

void EEVEE_lightprobes_refresh(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
	const DRWContextState *draw_ctx = DRW_context_state_get();
	const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);
	LightCache *light_cache = vedata->stl->g_data->light_cache;

	if (light_cache->flag & LIGHTCACHE_UPDATE_WORLD) {
		DRWMatrixState saved_mats;
		DRW_viewport_matrix_get_all(&saved_mats);
		EEVEE_lightbake_update_world_quick(sldata, vedata, scene_eval);
		DRW_viewport_matrix_override_set_all(&saved_mats);
	}
}

void EEVEE_lightprobes_free(void)
{
	MEM_SAFE_FREE(e_data.format_probe_display_cube);
	MEM_SAFE_FREE(e_data.format_probe_display_planar);
	DRW_TEXTURE_FREE_SAFE(e_data.hammersley);
	DRW_TEXTURE_FREE_SAFE(e_data.planar_pool_placeholder);
	DRW_TEXTURE_FREE_SAFE(e_data.depth_placeholder);
	DRW_TEXTURE_FREE_SAFE(e_data.depth_array_placeholder);
}