bgfx/examples/common/ps/particle_system.h

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/*
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* Copyright 2011-2020 Branimir Karadzic. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
*/
#ifndef PARTICLE_SYSTEM_H_HEADER_GUARD
#define PARTICLE_SYSTEM_H_HEADER_GUARD
#include <bx/allocator.h>
#include <bx/easing.h>
#include <bx/rng.h>
#include "../bounds.h"
struct EmitterHandle { uint16_t idx; };
struct EmitterSpriteHandle { uint16_t idx; };
template<typename Ty>
inline bool isValid(Ty _handle)
{
return _handle.idx != UINT16_MAX;
}
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struct EmitterShape
{
enum Enum
{
Sphere,
Hemisphere,
Circle,
Disc,
Rect,
Count
};
};
struct EmitterDirection
{
enum Enum
{
Up,
Outward,
Count
};
};
struct EmitterUniforms
{
void reset();
float m_position[3];
float m_angle[3];
float m_blendStart[2];
float m_blendEnd[2];
float m_offsetStart[2];
float m_offsetEnd[2];
float m_scaleStart[2];
float m_scaleEnd[2];
float m_lifeSpan[2];
float m_gravityScale;
uint32_t m_rgba[5];
uint32_t m_particlesPerSecond;
bx::Easing::Enum m_easePos;
bx::Easing::Enum m_easeRgba;
bx::Easing::Enum m_easeBlend;
bx::Easing::Enum m_easeScale;
EmitterSpriteHandle m_handle;
};
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///
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void psInit(uint16_t _maxEmitters = 64, bx::AllocatorI* _allocator = NULL);
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///
void psShutdown();
///
EmitterSpriteHandle psCreateSprite(uint16_t _width, uint16_t _height, const void* _data);
///
void psDestroy(EmitterSpriteHandle _handle);
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///
EmitterHandle psCreateEmitter(EmitterShape::Enum _shape, EmitterDirection::Enum _direction, uint32_t _maxParticles);
///
void psUpdateEmitter(EmitterHandle _handle, const EmitterUniforms* _uniforms = NULL);
///
void psGetAabb(EmitterHandle _handle, Aabb& _outAabb);
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///
void psDestroyEmitter(EmitterHandle _handle);
///
void psUpdate(float _dt);
///
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void psRender(uint8_t _view, const float* _mtxView, const bx::Vec3& _eye);
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#endif // PARTICLE_SYSTEM_H_HEADER_GUARD