particle_emitter.h

#pragma once
 
#include <cstdint>
 
#include <glm/glm.hpp>
 
#include "core/reflect.h"
 
namespace Vkm::Engine {

struct ParticleEmitter {
    bool     emitting     = true;
    float    rate         = 30.0f;  
    float    lifetime     = 1.5f;   
    uint32_t maxParticles = 256;    
 
    glm::vec3 velocity{0.0f, 2.0f, 0.0f};       
    float     spread = 1.0f;                    
    glm::vec3 acceleration{0.0f, -2.0f, 0.0f};
 
    // Lerped start -> end over each particle's life
    glm::vec4 startColor{1.0f, 0.8f, 0.4f, 1.0f};
    glm::vec4 endColor{1.0f, 0.2f, 0.0f, 0.0f};
    float     startSize = 0.25f;
    float     endSize   = 0.02f;
    float     softness  = 1.0f;  
    bool      additive  = true;  
};
 
} // namespace Vkm::Engine
 
VKM_REFLECT_BEGIN(::Vkm::Engine::ParticleEmitter)
    VKM_F(emitting)
    VKM_F(rate)
    VKM_F(lifetime)
    VKM_F(maxParticles)
    VKM_F(velocity)
    VKM_F(spread)
    VKM_F(acceleration)
    VKM_F(startColor)
    VKM_F(endColor)
    VKM_F(startSize)
    VKM_F(endSize)
    VKM_F(softness)
    VKM_F(additive)
VKM_REFLECT_END()