particle_system.hpp 14.8 KB
Newer Older
1
2
#pragma once

3
4
#include <mirrage/renderer/model.hpp>

5
#include <mirrage/asset/asset_manager.hpp>
6
#include <mirrage/ecs/entity_manager.hpp>
7
#include <mirrage/graphic/texture.hpp>
8
#include <mirrage/utils/random.hpp>
9
#include <mirrage/utils/sf2_glm.hpp>
10
#include <mirrage/utils/small_vector.hpp>
11
12
13
14
15
#include <mirrage/utils/units.hpp>

#include <glm/vec3.hpp>
#include <sf2/sf2.hpp>

16
#include <memory>
17
18
#include <tuple>

19
20
21

namespace mirrage::renderer {

22
	struct Particle {
23
24
25
26
		glm::vec4 position; // xyz + ttl_left
		glm::vec4 velocity; // xyz + ttl_initial
		glm::uvec4
		        ttl; // last_feedback_buffer_index, seed, keyframe, floatBitsToUint(keyframe_interpolation_factor)
27
28
	};

29
30
31
32
	class Particle_script {
	  public:
		explicit Particle_script(vk::UniquePipeline pipeline) : _pipeline(std::move(pipeline)) {}

33
		void bind(vk::CommandBuffer) const;
34
35
36
37
38

	  private:
		vk::UniquePipeline _pipeline;
	};

39
40
	enum class Particle_blend_mode { solid, transparent };
	sf2_enumDef(Particle_blend_mode, solid, transparent);
41

42
43
	enum class Particle_geometry { billboard, mesh };
	sf2_enumDef(Particle_geometry, billboard, mesh);
44
45

	struct Particle_color {
46
47
48
49
		float hue        = 0.f;
		float saturation = 0.f;
		float value      = 0.f;
		float alpha      = 0.f;
50
	};
51
	sf2_structDef(Particle_color, hue, saturation, value, alpha);
52

53
	/// angle + axis rotation with the axis expressed in spherical coordinates
Florian Oetke's avatar
Florian Oetke committed
54
	/// elevation=1 and azimuth=0 is (0,0,1) and the base-plane is XZ
55
	struct Particle_rotation {
Florian Oetke's avatar
Florian Oetke committed
56
		float elevation = 1.f; //< 0=0°, 1= 90°
57
58
59
60
61
62
		float azimuth   = 0.f; //< 0=0°, 1=360°
		float angle     = 0.f; //< 0=0°, 1=360°
		float padding;
	};
	sf2_structDef(Particle_rotation, elevation, azimuth, angle);

Florian Oetke's avatar
Florian Oetke committed
63
64
65
66
67
68
69
70
	struct Particle_direction {
		float elevation          = 1.f;
		float azimuth            = 0.f;
		float velocity_elevation = 1.f;
		float velocity_azimuth   = 0.f;
	};
	sf2_structDef(Particle_direction, elevation, azimuth, velocity_elevation, velocity_azimuth);

71
72
73
74
	template <typename T>
	struct Random_value {
		T mean{};
		T stddev{};
75
	};
76
77
	sf2_structDef(Random_value<float>, mean, stddev);
	sf2_structDef(Random_value<glm::vec4>, mean, stddev);
78
	sf2_structDef(Random_value<Particle_rotation>, mean, stddev);
79
	sf2_structDef(Random_value<Particle_color>, mean, stddev);
Florian Oetke's avatar
Florian Oetke committed
80
	sf2_structDef(Random_value<Particle_direction>, mean, stddev);
81

82

83
84
85
86
87
88
89
	/// modify velocities of living particles
	/// e.g.
	/// gravity: {..., force=10, dir={0,-1,0}, decay=0, fixed_dir=true}
	/// point: {position=? dir={0,0,0}, decay=2}
	/// flow: {position=? dir={1,0,0}, decay=2}
	struct Particle_effector_config {
		glm::quat rotation{1, 0, 0, 0};
90

91
		glm::vec3 position{0, 0, 0};
92
93
94
95
		float     force = 0.f;
		glm::vec3 force_dir{0, 0, 0};
		float     distance_decay = 2.f;

96
		bool fixed_dir       = false; //< ignore position of effector when calculating the force
97
		bool scale_with_mass = true;
98
		bool absolute        = false;
99
100
101
102
103
104
105
106
107
	};
	sf2_structDef(Particle_effector_config,
	              position,
	              rotation,
	              force,
	              force_dir,
	              distance_decay,
	              fixed_dir,
	              scale_with_mass);
108

109
	struct Particle_keyframe {
110
111
112
		Random_value<Particle_color>    color    = {{1, 1, 1, 1}};
		Random_value<Particle_rotation> rotation = {{0.f, 0.f, 0.f, 0.f}};
		Random_value<glm::vec4>         size     = {{1.f, 1.f, 1.f, 0.f}};
113
114
115
116
117
118
119

		float time      = 0;
		float base_mass = 1;
		float density   = 0;
		float drag      = 0.f;
	};
	sf2_structDef(Particle_keyframe, color, rotation, size, time, base_mass, density, drag);
120
121
	static_assert(sizeof(Particle_keyframe) == sizeof(float) * (4 * 3 * 2 + 4),
	              "Particle_keyframe contains padding");
122

123
124
	/// describes how living particles are updated and drawn
	struct Particle_type_config {
125
		util::small_vector<Particle_keyframe, 3> keyframes;
126

127
128
129
130
131
132
133
134
135
136
		bool color_normal_distribution_h    = false;
		bool color_normal_distribution_s    = false;
		bool color_normal_distribution_v    = false;
		bool color_normal_distribution_a    = false;
		bool rotation_normal_distribution_x = false;
		bool rotation_normal_distribution_y = false;
		bool rotation_normal_distribution_z = false;
		bool size_normal_distribution_x     = false;
		bool size_normal_distribution_y     = false;
		bool size_normal_distribution_z     = false;
137

138
		bool rotate_with_velocity = false;
139
		bool symmetric_scaling    = false; //< also use x size for y and z
140

141
142
143
		Particle_blend_mode blend    = Particle_blend_mode::transparent;
		Particle_geometry   geometry = Particle_geometry::billboard;

144
145
146
147
		float update_range = -1.f;
		float draw_range   = -1.f;
		bool  shadowcaster = false;

148
149
150
151
152
153
		std::string            material_id;
		renderer::Material_ptr material;

		std::string                 model_id;
		asset::Ptr<renderer::Model> model;

154
		std::string                 update_script_id;
155
		asset::Ptr<Particle_script> update_script;
156
	};
157
	sf2_structDef(Particle_type_config,
158
159
160
161
162
163
164
165
166
167
168
169
	              keyframes,
	              color_normal_distribution_h,
	              color_normal_distribution_s,
	              color_normal_distribution_v,
	              color_normal_distribution_a,
	              rotation_normal_distribution_x,
	              rotation_normal_distribution_y,
	              rotation_normal_distribution_z,
	              size_normal_distribution_x,
	              size_normal_distribution_y,
	              size_normal_distribution_z,
	              rotate_with_velocity,
170
	              symmetric_scaling,
171
	              blend,
172
	              geometry,
173
174
175
	              update_range,
	              draw_range,
	              shadowcaster,
176
177
178
179
	              material_id,
	              model_id,
	              update_script_id);

180
181
182

	struct Particle_emitter_spawn {
		float particles_per_second = 10.f;
183
		float stddev               = 0.f;
184
185
		float time                 = -1.f;
	};
186
	sf2_structDef(Particle_emitter_spawn, particles_per_second, stddev, time);
187
188
189
190
191
192
193

	// describes how new particles are created
	struct Particle_emitter_config {
		Random_value<float> ttl = {1.f};

		Random_value<float> velocity = {1.f};

194
195
196
		glm::vec4 size = {0.f, 1.f, 0.f, 0.f}; // min_radius, max_radius, <ignored>, <ignored>

		bool independent_direction = false; // initial velocity direction is independent of spawn position
Florian Oetke's avatar
Florian Oetke committed
197
198
199
		Random_value<Particle_direction> direction                     = {Particle_direction{},
                                                      Particle_direction{1.f, 0.5f, 1.f, 0.5f}};
		bool                             direction_normal_distribution = false;
200

201
202
203
		float parent_velocity = 0.f;

		glm::vec3 offset{0, 0, 0};
204
205
		glm::quat rotation{1, 0, 0, 0};

206
207
208
		util::small_vector<Particle_emitter_spawn, 4> spawn;
		bool                                          spawn_loop = true;

209
210
211
212
213
		std::string                 emit_script_id;
		asset::Ptr<Particle_script> emit_script;

		std::string                      type_id;
		asset::Ptr<Particle_type_config> type;
214
	};
215
216
217
218
219
	sf2_structDef(Particle_emitter_config,
	              spawn,
	              spawn_loop,
	              ttl,
	              velocity,
220
221
222
223
	              size,
	              independent_direction,
	              direction,
	              direction_normal_distribution,
224
225
226
227
228
	              parent_velocity,
	              offset,
	              rotation,
	              emit_script_id,
	              type_id);
229
230

	struct Particle_system_config {
231
232
		util::small_vector<Particle_emitter_config, 1> emitters;
		std::vector<Particle_effector_config>          effectors;
233
	};
234
	sf2_structDef(Particle_system_config, emitters, effectors);
235
236


237
238
239
240
241
	class Particle_emitter_gpu_data {
	  public:
		auto valid() const noexcept { return _live_rev && *_live_rev == _rev; }
		void set(const std::uint64_t* rev,
		         vk::Buffer,
242
		         vk::DescriptorSet,
243
244
245
246
		         std::int32_t  offset,
		         std::int32_t  count,
		         std::uint32_t feedback_idx);

247
248
249
		void next_uniforms(vk::DescriptorSet s) { _next_uniforms = s; }
		auto next_uniforms() const noexcept { return _next_uniforms; }

250
251
252
		auto batch_able() const noexcept { return _batch_able; }
		void batch_able(bool b) noexcept { _batch_able = b; }

253
254
	  private:
		vk::Buffer           _buffer;
255
256
		vk::DescriptorSet    _uniforms;
		vk::DescriptorSet    _next_uniforms;
257
258
259
260
261
		const std::uint64_t* _live_rev     = nullptr;
		std::uint64_t        _rev          = 0;
		std::int32_t         _offset       = 0;
		std::int32_t         _count        = 0;
		std::uint32_t        _feedback_idx = 0;
262
		bool                 _batch_able   = true;
263
264
265
266

		friend class Particle_emitter;
	};

267
268
	class Particle_emitter {
	  public:
269
		explicit Particle_emitter(const Particle_emitter_config& cfg) : _cfg(&cfg) {}
270

271
272
273
		void active(bool b) noexcept { _active = b; }
		auto active() const noexcept { return _active; }

274
		void position(glm::vec3 p) noexcept { _position = p; }
275
276
		auto position() const noexcept { return _position; }

277
		void rotation(glm::quat r) noexcept { _rotation = r; }
278
279
		auto rotation() const noexcept { return _rotation; }

280
281
282
		void absolute(bool b) noexcept { _absolute = b; }
		auto absolute() const noexcept { return _absolute; }

283
		void incr_time(float dt);
284
		auto spawn(util::default_rand&) -> std::int32_t;
285
		void override_spawn(std::int32_t spawn) { _particles_to_spawn = spawn; }
286
287
288
289
290
291
292
293
294

		auto drawable() const noexcept { return _gpu_data && _gpu_data->valid(); }
		auto particle_offset() const noexcept { return drawable() ? _gpu_data->_offset : 0; }
		auto particle_count() const noexcept { return drawable() ? _gpu_data->_count : 0; }
		auto particle_feedback_idx() const noexcept
		{
			return drawable() ? util::just(_gpu_data->_feedback_idx) : util::nothing;
		}
		auto particle_buffer() const noexcept { return drawable() ? _gpu_data->_buffer : vk::Buffer{}; }
295
296
297
298
		auto particle_uniforms() const noexcept
		{
			return drawable() ? _gpu_data->_uniforms : vk::DescriptorSet{};
		}
299
300
301
302
		auto particles_to_spawn() const noexcept { return _particles_to_spawn; }
		auto last_timestep() const noexcept { return _last_timestep; }

		auto gpu_data() -> std::shared_ptr<Particle_emitter_gpu_data>;
303

304
		auto cfg() const noexcept -> auto& { return *_cfg; }
305
306

	  private:
307
		const Particle_emitter_config* _cfg;
308
309

		// TODO: userdata?
310
		bool      _active = true;
311
312
		glm::vec3 _position{0, 0, 0};
		glm::quat _rotation{1, 0, 0, 0};
313
		bool      _absolute = false;
314

315
316
317
318
319
320
321
322
323
		float       _time_accumulator  = 0.f;
		std::size_t _spawn_idx         = 0;
		float       _spawn_entry_timer = 0;

		std::int32_t _particles_to_spawn = 0;
		float        _last_timestep      = 0;

		// shared_ptr because its update after the async compute tasks finished
		std::shared_ptr<Particle_emitter_gpu_data> _gpu_data;
324
325
	};

326
	class Particle_system : private std::enable_shared_from_this<Particle_system> {
327
	  public:
328
329
		using Emitter_list  = util::small_vector<Particle_emitter, 1>;
		using Effector_list = std::vector<Particle_effector_config>;
330

331
332
333
334
		Particle_system() = default;
		Particle_system(asset::Ptr<Particle_system_config> cfg,
		                glm::vec3                          position = {0, 0, 0},
		                glm::quat                          rotation = {1, 0, 0, 0});
335

336
		auto cfg() const noexcept { return _cfg; }
337
		auto cfg_aid() const { return _cfg ? util::just(_cfg.aid()) : util::nothing; }
338

339
340
341
342
343
		auto emitters() noexcept -> auto&
		{
			_check_reload();
			return _emitters;
		}
344

345
346
347
348
349
		auto effectors() noexcept -> auto&
		{
			_check_reload();
			return _effectors;
		}
350

351
		void position(glm::vec3 p) noexcept { _position = p; }
352
353
		auto position() const noexcept { return _position; }

354
		void rotation(glm::quat r) noexcept { _rotation = r; }
355
356
		auto rotation() const noexcept { return _rotation; }

357
358
359
360
361
362
363
		auto emitter_position(const Particle_emitter& e) const noexcept
		{
			return e.absolute() ? e.position() : _position + e.position();
		}

		auto emitter_rotation(const Particle_emitter& e) const noexcept
		{
364
			return e.absolute() ? e.rotation() : glm::normalize(_rotation * e.rotation());
365
366
		}

367
	  private:
368
369
		friend class Particle_pass;

370
371
372
373
		asset::Ptr<Particle_system_config> _cfg;
		bool                               _loaded = false;
		Emitter_list                       _emitters;
		Effector_list                      _effectors;
374

375
		glm::vec3 _position{0, 0, 0};
376
		glm::vec3 _last_position{0, 0, 0};
377
		glm::quat _rotation{1, 0, 0, 0};
378
379

		void _check_reload();
380
	};
381
382
383
384
385
386
387
388
389
390
391


	class Particle_system_comp : public ecs::Component<Particle_system_comp> {
	  public:
		static constexpr const char* name() { return "Particle_system"; }
		friend void                  load_component(ecs::Deserializer& state, Particle_system_comp&);
		friend void                  save_component(ecs::Serializer& state, const Particle_system_comp&);

		Particle_system_comp() = default;
		Particle_system_comp(ecs::Entity_handle owner, ecs::Entity_manager& em) : Component(owner, em) {}

392
393
394
		Particle_system particle_system;
	};

395
	class Particle_effector_comp : public ecs::Component<Particle_effector_comp> {
396
397
398
399
400
401
402
403
404
	  public:
		static constexpr const char* name() { return "Particle_effector"; }
		friend void                  load_component(ecs::Deserializer& state, Particle_effector_comp&);
		friend void                  save_component(ecs::Serializer& state, const Particle_effector_comp&);

		Particle_effector_comp() = default;
		Particle_effector_comp(ecs::Entity_handle owner, ecs::Entity_manager& em) : Component(owner, em) {}

		Particle_effector_config effector;
405
406
	};

407
408
409
410
411
412
413
414
415

	extern auto create_particle_shared_desc_set_layout(graphic::Device&) -> vk::UniqueDescriptorSetLayout;

	extern auto create_particle_script_pipeline_layout(graphic::Device&        device,
	                                                   vk::DescriptorSetLayout shared_desc_set,
	                                                   vk::DescriptorSetLayout storage_buffer,
	                                                   vk::DescriptorSetLayout uniform_buffer)
	        -> vk::UniquePipelineLayout;

416
} // namespace mirrage::renderer
417
418
419
420
421
422

namespace mirrage::asset {

	template <>
	struct Loader<renderer::Particle_script> {
	  public:
423
424
425
		Loader(graphic::Device&        device,
		       vk::DescriptorSetLayout storage_buffer,
		       vk::DescriptorSetLayout uniform_buffer);
426
427
428
429

		auto              load(istream in) -> renderer::Particle_script;
		[[noreturn]] void save(ostream, const renderer::Particle_script&)
		{
430
			MIRRAGE_FAIL("Save of Particle_script is not supported!");
431
432
433
		}

	  private:
434
435
436
		graphic::Device&              _device;
		vk::UniqueDescriptorSetLayout _shared_desc_set;
		vk::UniquePipelineLayout      _layout;
437
438
439
440
441
442
443
444
	};

	template <>
	struct Loader<renderer::Particle_system_config> {
	  public:
		static auto              load(istream in) -> async::task<renderer::Particle_system_config>;
		[[noreturn]] static void save(ostream, const renderer::Particle_system_config&)
		{
445
446
447
448
449
450
451
452
453
454
455
			MIRRAGE_FAIL("Save of Particle_system_config is not supported!");
		}
	};

	template <>
	struct Loader<renderer::Particle_type_config> {
	  public:
		static auto              load(istream in) -> async::task<renderer::Particle_type_config>;
		[[noreturn]] static void save(ostream, const renderer::Particle_type_config&)
		{
			MIRRAGE_FAIL("Save of Particle_type_config is not supported!");
456
457
458
459
		}
	};

} // namespace mirrage::asset