src/bz/fx/particle_simulation.c

   1 #include <bz/fx/particle_simulation_internal.h>
   2
   3 #include <bz/fx/particle_system_internal.h>
   4 #include <bz/math/math.h>
   5 #include <bz/math/random.h>
   6 #include <bz/memory/allocator.h>
   7 #include <bz/types/identifier.h>
   8
   9 BZParticleSimulationID bzFXCreateParticleSimulation(BZMemoryArenaID arena, size_t maxParticles, BZParticleSystemID system, const char *identifierFmt, ...) {
  10         BZParticleSimulationID simulation = bzMemoryAlloc(arena, sizeof(BZParticleSimulation));
  11         simulation->system = system;
  12
  13         simulation->maxParticles = maxParticles;//10 * 1024;
  14         simulation->nextParticle = 0;
  15
  16         simulation->time = 0;
  17
  18         simulation->spawnTime = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  19         simulation->lifetime = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  20         simulation->positionX = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  21         simulation->positionY = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  22         simulation->size = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  23         simulation->baseAngle = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  24         simulation->angle = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  25         simulation->color = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  26         simulation->alpha = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(float));
  27         simulation->userData = bzMemoryAlloc(arena, simulation->maxParticles * sizeof(void *));
  28
  29         return simulation;
  30 }
  31
  32 void bzFXUpdateParticleSystem(BZParticleSimulationID simulation, float deltaTime) {
  33         simulation->time += deltaTime;//1.0f / 30.0f;
  34         bzFXUpdateParticleSystemParticles(simulation->system,
  35                 simulation->maxParticles,
  36                 simulation->time,
  37                 simulation->spawnTime,
  38                 simulation->lifetime,
  39                 simulation->positionX,
  40                 simulation->positionY,
  41                 simulation->size,
  42                 simulation->baseAngle,
  43                 simulation->angle,
  44                 simulation->color,
  45                 simulation->alpha,
  46                 simulation->userData);
  47 }
  48
  49 void bzFXSpawnParticles(BZParticleSimulationID simulation, BZIdentifierHash eventIdentifier, const BZVector *position, const float angle) {
  50         BZParticleSystemID particleSystem = simulation->system;
  51         simulation->nextParticle += bzFXSpawnParticleSystemParticles(particleSystem,
  52                 eventIdentifier,
  53                 position, angle,
  54                 simulation->maxParticles, simulation->nextParticle,
  55                 simulation->time,
  56                 simulation->spawnTime,
  57                 simulation->lifetime,
  58                 simulation->positionX,
  59                 simulation->positionY,
  60                 simulation->size,
  61                 simulation->baseAngle,
  62                 simulation->angle,
  63                 simulation->color,
  64                 simulation->alpha,
  65                 simulation->userData);
  66         simulation->nextParticle %= simulation->maxParticles;
  67 }
  68
  69 void bzFXDespawnParticle(BZParticleSimulationID simulation, size_t idx) {
  70         simulation->lifetime[idx] = 0.0f;
  71 }