particles.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
#ifndef GAME_CLIENT_COMPONENTS_PARTICLES_H
#define GAME_CLIENT_COMPONENTS_PARTICLES_H
#include <base/color.h>
#include <base/vmath.h>
#include <game/client/component.h>
 
// particles
struct CParticle
{
    void SetDefault()
    {
        m_Pos = vec2(0, 0);
        m_Vel = vec2(0, 0);
        m_LifeSpan = 0;
        m_StartSize = 32;
        m_EndSize = 32;
        m_UseAlphaFading = false;
        m_StartAlpha = 1;
        m_EndAlpha = 1;
        m_Rot = 0;
        m_Rotspeed = 0;
        m_Gravity = 0;
        m_Friction = 0;
        m_FlowAffected = 1.0f;
        m_Color = ColorRGBA(1, 1, 1, 1);
        m_Collides = true;
    }
 
    vec2 m_Pos;
    vec2 m_Vel;
 
    int m_Spr;
 
    float m_FlowAffected;
 
    float m_LifeSpan;
 
    float m_StartSize;
    float m_EndSize;
 
    bool m_UseAlphaFading;
    float m_StartAlpha;
    float m_EndAlpha;
 
    float m_Rot;
    float m_Rotspeed;
 
    float m_Gravity;
    float m_Friction;
 
    ColorRGBA m_Color;
 
    bool m_Collides;
 
    // set by the particle system
    float m_Life;
    int m_PrevPart;
    int m_NextPart;
};
 
class CParticles : public CComponent
{
    friend class CGameClient;
 
public:
    enum
    {
        GROUP_PROJECTILE_TRAIL = 0,
        GROUP_TRAIL_EXTRA,
        GROUP_EXPLOSIONS,
        GROUP_EXTRA,
        GROUP_GENERAL,
        NUM_GROUPS
    };
 
    CParticles();
    int Sizeof() const override { return sizeof(*this); }
 
    void Add(int Group, CParticle *pPart, float TimePassed = 0.f);
 
    void OnReset() override;
    void OnRender() override;
    void OnInit() override;
 
private:
    int m_ParticleQuadContainerIndex;
    int m_ExtraParticleQuadContainerIndex;
 
    enum
    {
        MAX_PARTICLES = 1024 * 8,
    };
 
    CParticle m_aParticles[MAX_PARTICLES];
    int m_FirstFree;
    int m_aFirstPart[NUM_GROUPS];
 
    float m_FrictionFraction = 0.0f;
    int64_t m_LastRenderTime = 0;
 
    void RenderGroup(int Group);
    void Update(float TimePassed);
 
    template<int TGROUP>
    class CRenderGroup : public CComponent
    {
    public:
        CParticles *m_pParts;
        int Sizeof() const override { return sizeof(*this); }
        void OnRender() override { m_pParts->RenderGroup(TGROUP); }
    };
 
    // behind players
    CRenderGroup<GROUP_PROJECTILE_TRAIL> m_RenderTrail;
    CRenderGroup<GROUP_TRAIL_EXTRA> m_RenderTrailExtra;
    // in front of players
    CRenderGroup<GROUP_EXPLOSIONS> m_RenderExplosions;
    CRenderGroup<GROUP_EXTRA> m_RenderExtra;
    CRenderGroup<GROUP_GENERAL> m_RenderGeneral;
 
    bool ParticleIsVisibleOnScreen(const vec2 &CurPos, float CurSize);
};
#endif