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-/*************************************************************************/
-/* light_cluster_builder.h */
-/*************************************************************************/
-/* This file is part of: */
-/* GODOT ENGINE */
-/* https://godotengine.org */
-/*************************************************************************/
-/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
-/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
-/* */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the */
-/* "Software"), to deal in the Software without restriction, including */
-/* without limitation the rights to use, copy, modify, merge, publish, */
-/* distribute, sublicense, and/or sell copies of the Software, and to */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions: */
-/* */
-/* The above copyright notice and this permission notice shall be */
-/* included in all copies or substantial portions of the Software. */
-/* */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
-/*************************************************************************/
-
-#ifndef LIGHT_CLUSTER_BUILDER_H
-#define LIGHT_CLUSTER_BUILDER_H
-
-#include "servers/rendering/renderer_rd/renderer_storage_rd.h"
-
-class LightClusterBuilder {
-public:
- enum LightType {
- LIGHT_TYPE_OMNI,
- LIGHT_TYPE_SPOT
- };
-
- enum ItemType {
- ITEM_TYPE_OMNI_LIGHT,
- ITEM_TYPE_SPOT_LIGHT,
- ITEM_TYPE_REFLECTION_PROBE,
- ITEM_TYPE_DECAL,
- ITEM_TYPE_MAX //should always be 4
- };
-
- enum {
- COUNTER_SHIFT = 20, //one million total ids
- POINTER_MASK = (1 << COUNTER_SHIFT) - 1,
- COUNTER_MASK = 0xfff // 4096 items per cell
- };
-
-private:
- struct LightData {
- float position[3];
- uint32_t type;
- float radius;
- float spot_aperture;
- uint32_t pad[2];
- };
-
- uint32_t light_count = 0;
- uint32_t light_max = 0;
- LightData *lights = nullptr;
-
- struct OrientedBoxData {
- float position[3];
- uint32_t pad;
- float x_axis[3];
- uint32_t pad2;
- float y_axis[3];
- uint32_t pad3;
- float z_axis[3];
- uint32_t pad4;
- };
-
- uint32_t refprobe_count = 0;
- uint32_t refprobe_max = 0;
- OrientedBoxData *refprobes = nullptr;
-
- uint32_t decal_count = 0;
- uint32_t decal_max = 0;
- OrientedBoxData *decals = nullptr;
-
- struct Item {
- AABB aabb;
- ItemType type;
- uint32_t index;
- };
-
- Item *items = nullptr;
- uint32_t item_count = 0;
- uint32_t item_max = 0;
-
- uint32_t width = 0;
- uint32_t height = 0;
- uint32_t depth = 0;
-
- struct Cell {
- uint32_t item_pointers[ITEM_TYPE_MAX];
- };
-
- Vector<uint8_t> cluster_data;
- RID cluster_texture;
-
- struct SortID {
- uint32_t cell_index;
- uint32_t item_index;
- ItemType item_type;
- };
-
- SortID *sort_ids = nullptr;
- Vector<uint32_t> ids;
- uint32_t sort_id_count = 0;
- uint32_t sort_id_max = 0;
- RID items_buffer;
-
- Transform view_xform;
- CameraMatrix projection;
- float z_far = 0;
- float z_near = 0;
-
- _FORCE_INLINE_ void _add_item(const AABB &p_aabb, ItemType p_type, uint32_t p_index) {
- if (unlikely(item_count == item_max)) {
- item_max = nearest_power_of_2_templated(item_max + 1);
- items = (Item *)memrealloc(items, sizeof(Item) * item_max);
- }
-
- Item &item = items[item_count];
- item.aabb = p_aabb;
- item.index = p_index;
- item.type = p_type;
- item_count++;
- }
-
-public:
- void begin(const Transform &p_view_transform, const CameraMatrix &p_cam_projection);
-
- _FORCE_INLINE_ void add_light(LightType p_type, const Transform &p_transform, float p_radius, float p_spot_aperture) {
- if (unlikely(light_count == light_max)) {
- light_max = nearest_power_of_2_templated(light_max + 1);
- lights = (LightData *)memrealloc(lights, sizeof(LightData) * light_max);
- }
-
- LightData &ld = lights[light_count];
- ld.type = p_type;
- ld.position[0] = p_transform.origin.x;
- ld.position[1] = p_transform.origin.y;
- ld.position[2] = p_transform.origin.z;
- ld.radius = p_radius;
- ld.spot_aperture = p_spot_aperture;
-
- Transform xform = view_xform * p_transform;
-
- ld.radius *= xform.basis.get_uniform_scale();
-
- AABB aabb;
-
- switch (p_type) {
- case LIGHT_TYPE_OMNI: {
- aabb.position = xform.origin;
- aabb.size = Vector3(ld.radius, ld.radius, ld.radius);
- aabb.position -= aabb.size;
- aabb.size *= 2.0;
-
- _add_item(aabb, ITEM_TYPE_OMNI_LIGHT, light_count);
- } break;
- case LIGHT_TYPE_SPOT: {
- float r = ld.radius;
- real_t len = Math::tan(Math::deg2rad(ld.spot_aperture)) * r;
-
- aabb.position = xform.origin;
- aabb.expand_to(xform.xform(Vector3(len, len, -r)));
- aabb.expand_to(xform.xform(Vector3(-len, len, -r)));
- aabb.expand_to(xform.xform(Vector3(-len, -len, -r)));
- aabb.expand_to(xform.xform(Vector3(len, -len, -r)));
- _add_item(aabb, ITEM_TYPE_SPOT_LIGHT, light_count);
- } break;
- }
-
- light_count++;
- }
-
- _FORCE_INLINE_ void add_reflection_probe(const Transform &p_transform, const Vector3 &p_half_extents) {
- if (unlikely(refprobe_count == refprobe_max)) {
- refprobe_max = nearest_power_of_2_templated(refprobe_max + 1);
- refprobes = (OrientedBoxData *)memrealloc(refprobes, sizeof(OrientedBoxData) * refprobe_max);
- }
-
- Transform xform = view_xform * p_transform;
-
- OrientedBoxData &rp = refprobes[refprobe_count];
- Vector3 origin = xform.origin;
- rp.position[0] = origin.x;
- rp.position[1] = origin.y;
- rp.position[2] = origin.z;
-
- Vector3 x_axis = xform.basis.get_axis(0) * p_half_extents.x;
- rp.x_axis[0] = x_axis.x;
- rp.x_axis[1] = x_axis.y;
- rp.x_axis[2] = x_axis.z;
-
- Vector3 y_axis = xform.basis.get_axis(1) * p_half_extents.y;
- rp.y_axis[0] = y_axis.x;
- rp.y_axis[1] = y_axis.y;
- rp.y_axis[2] = y_axis.z;
-
- Vector3 z_axis = xform.basis.get_axis(2) * p_half_extents.z;
- rp.z_axis[0] = z_axis.x;
- rp.z_axis[1] = z_axis.y;
- rp.z_axis[2] = z_axis.z;
-
- AABB aabb;
-
- aabb.position = origin + x_axis + y_axis + z_axis;
- aabb.expand_to(origin + x_axis + y_axis - z_axis);
- aabb.expand_to(origin + x_axis - y_axis + z_axis);
- aabb.expand_to(origin + x_axis - y_axis - z_axis);
- aabb.expand_to(origin - x_axis + y_axis + z_axis);
- aabb.expand_to(origin - x_axis + y_axis - z_axis);
- aabb.expand_to(origin - x_axis - y_axis + z_axis);
- aabb.expand_to(origin - x_axis - y_axis - z_axis);
-
- _add_item(aabb, ITEM_TYPE_REFLECTION_PROBE, refprobe_count);
-
- refprobe_count++;
- }
-
- _FORCE_INLINE_ void add_decal(const Transform &p_transform, const Vector3 &p_half_extents) {
- if (unlikely(decal_count == decal_max)) {
- decal_max = nearest_power_of_2_templated(decal_max + 1);
- decals = (OrientedBoxData *)memrealloc(decals, sizeof(OrientedBoxData) * decal_max);
- }
-
- Transform xform = view_xform * p_transform;
-
- OrientedBoxData &dc = decals[decal_count];
-
- Vector3 origin = xform.origin;
- dc.position[0] = origin.x;
- dc.position[1] = origin.y;
- dc.position[2] = origin.z;
-
- Vector3 x_axis = xform.basis.get_axis(0) * p_half_extents.x;
- dc.x_axis[0] = x_axis.x;
- dc.x_axis[1] = x_axis.y;
- dc.x_axis[2] = x_axis.z;
-
- Vector3 y_axis = xform.basis.get_axis(1) * p_half_extents.y;
- dc.y_axis[0] = y_axis.x;
- dc.y_axis[1] = y_axis.y;
- dc.y_axis[2] = y_axis.z;
-
- Vector3 z_axis = xform.basis.get_axis(2) * p_half_extents.z;
- dc.z_axis[0] = z_axis.x;
- dc.z_axis[1] = z_axis.y;
- dc.z_axis[2] = z_axis.z;
-
- AABB aabb;
-
- aabb.position = origin + x_axis + y_axis + z_axis;
- aabb.expand_to(origin + x_axis + y_axis - z_axis);
- aabb.expand_to(origin + x_axis - y_axis + z_axis);
- aabb.expand_to(origin + x_axis - y_axis - z_axis);
- aabb.expand_to(origin - x_axis + y_axis + z_axis);
- aabb.expand_to(origin - x_axis + y_axis - z_axis);
- aabb.expand_to(origin - x_axis - y_axis + z_axis);
- aabb.expand_to(origin - x_axis - y_axis - z_axis);
-
- _add_item(aabb, ITEM_TYPE_DECAL, decal_count);
-
- decal_count++;
- }
-
- void bake_cluster();
-
- void setup(uint32_t p_width, uint32_t p_height, uint32_t p_depth);
-
- RID get_cluster_texture() const;
- RID get_cluster_indices_buffer() const;
-
- LightClusterBuilder();
- ~LightClusterBuilder();
-};
-
-#endif // LIGHT_CLUSTER_BUILDER_H