particle_system.hpp 13.3 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
23
24
	struct Particle {
		glm::vec4 position; // xyz + uintBitsToFloat(last_feedback_buffer_index)
		glm::vec4 velocity; // xyz + seed
25
		glm::vec4 ttl;      // ttl_left, ttl_initial, keyframe, keyframe_interpolation_factor
26
27
	};

28
29
30
31
	class Particle_script {
	  public:
		explicit Particle_script(vk::UniquePipeline pipeline) : _pipeline(std::move(pipeline)) {}

32
		void bind(vk::CommandBuffer) const;
33
34
35
36
37

	  private:
		vk::UniquePipeline _pipeline;
	};

38
39
	enum class Particle_blend_mode { solid, transparent };
	sf2_enumDef(Particle_blend_mode, solid, transparent);
40

41
42
	enum class Particle_geometry { billboard, mesh };
	sf2_enumDef(Particle_geometry, billboard, mesh);
43
44

	struct Particle_color {
45
46
47
48
		float hue        = 0.f;
		float saturation = 0.f;
		float value      = 0.f;
		float alpha      = 0.f;
49
	};
50
	sf2_structDef(Particle_color, hue, saturation, value, alpha);
51

52
53
54
55
	template <typename T>
	struct Random_value {
		T mean{};
		T stddev{};
56
	};
57
58
	sf2_structDef(Random_value<float>, mean, stddev);
	sf2_structDef(Random_value<glm::vec4>, mean, stddev);
59
	sf2_structDef(Random_value<glm::quat>, mean, stddev);
60
	sf2_structDef(Random_value<Particle_color>, mean, stddev);
61

62

63
64
65
66
67
68
69
	/// 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};
70

71
		glm::vec3 position{0, 0, 0};
72
73
74
75
		float     force = 0.f;
		glm::vec3 force_dir{0, 0, 0};
		float     distance_decay = 2.f;

76
		bool fixed_dir       = false; //< ignore position of effector when calculating the force
77
		bool scale_with_mass = true;
78
		bool absolute        = false;
79
80
81
82
83
84
85
86
87
	};
	sf2_structDef(Particle_effector_config,
	              position,
	              rotation,
	              force,
	              force_dir,
	              distance_decay,
	              fixed_dir,
	              scale_with_mass);
88

89
90
91
92
93
94
95
96
97
98
99
100
	struct Particle_keyframe {
		Random_value<Particle_color> color    = {{1, 1, 1, 1}};
		Random_value<glm::vec4>      rotation = {{0.f, 0.f, 0.f, 0.f}};
		Random_value<glm::vec4>      size     = {{1.f, 1.f, 1.f, 0.f}};

		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);

101
102
	/// describes how living particles are updated and drawn
	struct Particle_type_config {
103
		util::small_vector<Particle_keyframe, 3> keyframes;
104

105
106
107
108
109
110
111
112
113
114
		bool color_normal_distribution_h    = true;
		bool color_normal_distribution_s    = true;
		bool color_normal_distribution_v    = true;
		bool color_normal_distribution_a    = true;
		bool rotation_normal_distribution_x = true;
		bool rotation_normal_distribution_y = true;
		bool rotation_normal_distribution_z = true;
		bool size_normal_distribution_x     = true;
		bool size_normal_distribution_y     = true;
		bool size_normal_distribution_z     = true;
115

116
		bool rotate_with_velocity = false;
117

118
119
120
		Particle_blend_mode blend    = Particle_blend_mode::transparent;
		Particle_geometry   geometry = Particle_geometry::billboard;

121
122
123
124
		float update_range = -1.f;
		float draw_range   = -1.f;
		bool  shadowcaster = false;

125
126
127
128
129
130
		std::string            material_id;
		renderer::Material_ptr material;

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

131
		std::string                 update_script_id;
132
		asset::Ptr<Particle_script> update_script;
133
	};
134
	sf2_structDef(Particle_type_config,
135
136
137
138
139
140
141
142
143
144
145
146
	              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,
147
	              blend,
148
	              geometry,
149
150
151
	              update_range,
	              draw_range,
	              shadowcaster,
152
153
154
155
	              material_id,
	              model_id,
	              update_script_id);

156
157
158

	struct Particle_emitter_spawn {
		float particles_per_second = 10.f;
159
		float stddev               = 0.f;
160
161
		float time                 = -1.f;
	};
162
	sf2_structDef(Particle_emitter_spawn, particles_per_second, stddev, time);
163
164
165
166
167
168
169
170
171
172

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

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

		float parent_velocity = 0.f;

		glm::vec3 offset{0, 0, 0};
173
174
		glm::quat rotation{1, 0, 0, 0};

175
176
177
		util::small_vector<Particle_emitter_spawn, 4> spawn;
		bool                                          spawn_loop = true;

178
179
180
181
182
		std::string                 emit_script_id;
		asset::Ptr<Particle_script> emit_script;

		std::string                      type_id;
		asset::Ptr<Particle_type_config> type;
183
	};
184
185
186
187
188
189
190
191
192
193
	sf2_structDef(Particle_emitter_config,
	              spawn,
	              spawn_loop,
	              ttl,
	              velocity,
	              parent_velocity,
	              offset,
	              rotation,
	              emit_script_id,
	              type_id);
194
195

	struct Particle_system_config {
196
197
		util::small_vector<Particle_emitter_config, 1> emitters;
		std::vector<Particle_effector_config>          effectors;
198
	};
199
	sf2_structDef(Particle_system_config, emitters, effectors);
200
201


202
203
204
205
206
	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,
207
		         vk::DescriptorSet,
208
209
210
211
		         std::int32_t  offset,
		         std::int32_t  count,
		         std::uint32_t feedback_idx);

212
213
214
		void next_uniforms(vk::DescriptorSet s) { _next_uniforms = s; }
		auto next_uniforms() const noexcept { return _next_uniforms; }

215
216
217
		auto batch_able() const noexcept { return _batch_able; }
		void batch_able(bool b) noexcept { _batch_able = b; }

218
219
	  private:
		vk::Buffer           _buffer;
220
221
		vk::DescriptorSet    _uniforms;
		vk::DescriptorSet    _next_uniforms;
222
223
224
225
226
		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;
227
		bool                 _batch_able   = true;
228
229
230
231

		friend class Particle_emitter;
	};

232
233
	class Particle_emitter {
	  public:
234
		explicit Particle_emitter(const Particle_emitter_config& cfg) : _cfg(&cfg) {}
235

236
237
238
		void active(bool b) noexcept { _active = b; }
		auto active() const noexcept { return _active; }

239
		void position(glm::vec3 p) noexcept { _position = p; }
240
241
		auto position() const noexcept { return _position; }

242
		void rotation(glm::quat r) noexcept { _rotation = r; }
243
244
		auto rotation() const noexcept { return _rotation; }

245
246
247
		void absolute(bool b) noexcept { _absolute = b; }
		auto absolute() const noexcept { return _absolute; }

248
		void incr_time(float dt);
249
		auto spawn(util::default_rand&) -> std::int32_t;
250
		void override_spawn(std::int32_t spawn) { _particles_to_spawn = spawn; }
251
252
253
254
255
256
257
258
259

		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{}; }
260
261
262
263
		auto particle_uniforms() const noexcept
		{
			return drawable() ? _gpu_data->_uniforms : vk::DescriptorSet{};
		}
264
265
266
267
		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>;
268

269
		auto cfg() const noexcept -> auto& { return *_cfg; }
270
271

	  private:
272
		const Particle_emitter_config* _cfg;
273
274

		// TODO: userdata?
275
		bool      _active = true;
276
277
		glm::vec3 _position{0, 0, 0};
		glm::quat _rotation{1, 0, 0, 0};
278
		bool      _absolute = false;
279

280
281
282
283
284
285
286
287
288
		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;
289
290
	};

291
	class Particle_system : private std::enable_shared_from_this<Particle_system> {
292
	  public:
293
294
		using Emitter_list  = util::small_vector<Particle_emitter, 1>;
		using Effector_list = std::vector<Particle_effector_config>;
295

296
297
298
299
		Particle_system() = default;
		Particle_system(asset::Ptr<Particle_system_config> cfg,
		                glm::vec3                          position = {0, 0, 0},
		                glm::quat                          rotation = {1, 0, 0, 0});
300

301
		auto cfg() const noexcept { return _cfg; }
302
		auto cfg_aid() const { return _cfg ? util::just(_cfg.aid()) : util::nothing; }
303

304
305
306
307
308
		auto emitters() noexcept -> auto&
		{
			_check_reload();
			return _emitters;
		}
309

310
311
312
313
314
		auto effectors() noexcept -> auto&
		{
			_check_reload();
			return _effectors;
		}
315

316
		void position(glm::vec3 p) noexcept { _position = p; }
317
318
		auto position() const noexcept { return _position; }

319
		void rotation(glm::quat r) noexcept { _rotation = r; }
320
321
		auto rotation() const noexcept { return _rotation; }

322
323
324
325
326
327
328
		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
		{
329
			return e.absolute() ? e.rotation() : glm::normalize(_rotation * e.rotation());
330
331
		}

332
	  private:
333
334
		friend class Particle_pass;

335
336
337
338
		asset::Ptr<Particle_system_config> _cfg;
		bool                               _loaded = false;
		Emitter_list                       _emitters;
		Effector_list                      _effectors;
339

340
		glm::vec3 _position{0, 0, 0};
341
		glm::vec3 _last_position{0, 0, 0};
342
		glm::quat _rotation{1, 0, 0, 0};
343
344

		void _check_reload();
345
	};
346
347
348
349
350
351
352
353
354
355
356


	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) {}

357
358
359
		Particle_system particle_system;
	};

360
	class Particle_effector_comp : public ecs::Component<Particle_effector_comp> {
361
362
363
364
365
366
367
368
369
	  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;
370
371
	};

372
373
374
375
376
377
378
379
380

	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;

381
} // namespace mirrage::renderer
382
383
384
385
386
387

namespace mirrage::asset {

	template <>
	struct Loader<renderer::Particle_script> {
	  public:
388
389
390
		Loader(graphic::Device&        device,
		       vk::DescriptorSetLayout storage_buffer,
		       vk::DescriptorSetLayout uniform_buffer);
391
392
393
394

		auto              load(istream in) -> renderer::Particle_script;
		[[noreturn]] void save(ostream, const renderer::Particle_script&)
		{
395
			MIRRAGE_FAIL("Save of Particle_script is not supported!");
396
397
398
		}

	  private:
399
400
401
		graphic::Device&              _device;
		vk::UniqueDescriptorSetLayout _shared_desc_set;
		vk::UniquePipelineLayout      _layout;
402
403
404
405
406
407
408
409
	};

	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&)
		{
410
411
412
413
414
415
416
417
418
419
420
			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!");
421
422
423
424
		}
	};

} // namespace mirrage::asset