mirror of
https://github.com/ptitSeb/Serious-Engine
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103 lines
5.2 KiB
C
103 lines
5.2 KiB
C
/*
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* LWSDK Header File
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* Copyright 1999, NewTek, Inc.
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*
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* LWPRTCL.H -- LightWave Particles
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*/
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#ifndef LWSDK_PRTCL_H
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#define LWSDK_PRTCL_H
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#include <lwmeshes.h>
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#include <lwrender.h>
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#include <lwio.h>
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#include <lwglobsrv.h>
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#define LWPSYSFUNCS_GLOBAL "Particle Services"
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/*
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The particle services provide some functions to create and manage particle data,
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this data is made accessible to other clients by query functions that lookup particle
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data from itemIDs. These services can be used by particle simulator to publish their particle
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information, and by particle renderers to access the particle informations.
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A "particle system" designates a group of particles sharing the same type of data.
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The data is allocated by type in buffers. For example if the particles in a system have
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the following informations: Age, Position, Color. The particle system will have 3 data
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buffers, one for each type and the create function will take the following flags:
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LWPSB_POS | LWPSB_AGE | LWPSB_VEL.
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Once the buffers are created and filled in, they must be attached to an item in the scene.
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This can be done with the attach\detach functions, the query can be done with the getPSys
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function.
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*/
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typedef struct st_LWPSys *LWPSysID;
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typedef struct st_LWPSBuf *LWPSBufID;
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/* particle types */
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#define LWPST_PRTCL 0
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#define LWPST_TRAIL 1
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/* buffer flags */
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#define LWPSB_POS (1<<0) /* position (float[3]) */
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#define LWPSB_SIZ (1<<1) /* size (float) */
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#define LWPSB_SCL (1<<2) /* scale (float[3]) */
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#define LWPSB_ROT (1<<3) /* rotation (float[3]) */
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#define LWPSB_VEL (1<<4) /* velocity (float[3]) */
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#define LWPSB_AGE (1<<5) /* age (float) */
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#define LWPSB_FCE (1<<6) /* force (float) */
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#define LWPSB_PRS (1<<7) /* pressure (float) */
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#define LWPSB_TMP (1<<8) /* temperature (float) */
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#define LWPSB_MAS (1<<9) /* mass (float) */
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#define LWPSB_LNK (1<<10)/* link to particle (for trails) (int) */
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#define LWPSB_ID (1<<11)/* particle ID, unique identifier for a particle (int) */
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#define LWPSB_ENB (1<<12)/* particle state (alive/limbo/dead) (char) */
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#define LWPSB_RGBA (1<<13)/* particle color,alpha (for display) (char[4]) */
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#define LWPSB_CAGE (1<<14)/* collision age: time since last collision (float) */
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typedef struct st_LWPSBufDesc {
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const char *name;
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int dataType,dataSize;
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}LWPSBufDesc;
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/* data types */
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#define LWPSBT_FLOAT 0
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#define LWPSBT_INT 1
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#define LWPSBT_CHAR 2
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/* Particle state values */
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#define LWPST_DEAD 0
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#define LWPST_ALIVE 1
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#define LWPST_LIMBO 2
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/*
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"Alive": that is the normal state. Particles in that state will be rendered.
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"Limbo": the idea behind that state is to allow particles to subsist in the database
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for a while after they die, before being totally removed. When switching a particle to limbo
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state, the particle age should be reset to 0 since the age is relative to the state.
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"Dead": particles will simply be ignored, it is possible to create them however merely
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for convenience.
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*/
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typedef struct st_LWPSysFuncs {
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LWPSysID (*create)(int flags,int type); /* creates a particle system with */
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int (*destroy)(LWPSysID ps); /* destroys a particle system */
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int (*init)(LWPSysID ps,int np); /* allocates all buffers with specified number of particles */
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void (*cleanup) (LWPSysID ps); /* frees all buffers */
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void (*load)(LWPSysID ps,LWLoadState *lstate);
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void (*save)(LWPSysID ps,LWSaveState *sstate);
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int (*getPCount)(LWPSysID ps); /* returns number of particles */
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void (*attach)(LWPSysID ps,LWItemID item); /* attaches data to an item, multiple PSys can be attached to an item and multiple items can share the same data */
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void (*detach)(LWPSysID ps,LWItemID item); /* detaches data */
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LWPSysID *(*getPSys)(LWItemID item); /* returns null terminated list of PSys attached to item. */
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LWPSBufID (*addBuf)(LWPSysID ps,LWPSBufDesc desc); /* adds a new data buffer to the system */
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LWPSBufID (*getBufID)(LWPSysID ps,int bufFlag); /* gets a buffer ID, given its flag */
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void (*setBufData)(LWPSBufID buf,void *data); /* sets a buffer en-masse by performing a memcopy from the given pointer */
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void (*getBufData)(LWPSBufID buf,void *data); /* gets data from a buffer */
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int (*addParticle)(LWPSysID ps); /* adds a particle to the system */
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void (*setParticle)(LWPSBufID buf,int idx,void *data); /* sets a particle for the given data buffer */
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void (*getParticle)(LWPSBufID buf,int idx,void *data); /* gets a particle data from the given buffer */
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void (*remParticle)(LWPSysID ps,int idx); /* removes a particle from the system */
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} LWPSysFuncs;
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#endif LWSDK_PRTCL_H
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