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76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*
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* Copyright (C) Volition, Inc. 1999. All rights reserved.
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*
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* All source code herein is the property of Volition, Inc. You may not sell
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* or otherwise commercially exploit the source or things you created based on the
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* source.
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*
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*/
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#ifndef _TRAILS_H
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#define _TRAILS_H
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#include "globalincs/pstypes.h"
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#include "graphics/generic.h"
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#define NUM_TRAIL_SECTIONS 128
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// contrail info - similar to that for missile trails
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// place this inside of info structures instead of explicit structs (eg. ship_info instead of ship, or weapon_info instead of weapon)
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typedef struct trail_info {
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vec3d pt; // offset from the object's center
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float w_start; // starting width
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float w_end; // ending width
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float a_start; // starting alpha
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float a_end; // ending alpha
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float max_life; // max_life for a section
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int stamp; // spew timestamp
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generic_bitmap texture; // texture to use for trail
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int n_fade_out_sections;// number of initial sections used for fading out start 'edge' of the effect
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float spread; // casues the trail points to spread and drift away over its lifetime
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// trail points move away sideways randomly between 0 - spread m/s
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} trail_info;
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typedef struct trail {
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int head, tail; // pointers into the queue for the trail points
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vec3d pos[NUM_TRAIL_SECTIONS]; // positions of trail points
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vec3d vel[NUM_TRAIL_SECTIONS]; // velocities of trail points (only non-zero if spread is set)
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float val[NUM_TRAIL_SECTIONS]; // for each point, a value that tells how much to fade out
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bool object_died; // set to zero as long as object
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int trail_stamp; // trail timestamp
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// trail info
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trail_info info; // this is passed when creating a trail
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struct trail * next;
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} trail;
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// Call at the start of freespace to init trails
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// Call at start of level to reinit all missilie trail stuff
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void trail_level_init();
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void trail_level_close();
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// Needs to be called from somewhere to move the trails each frame
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void trail_move_all(float frametime);
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// Needs to be called from somewhere to render the trails each frame
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void trail_render_all();
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// The following functions are what the weapon code calls
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// to deal with trails:
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// Returns -1 if failed
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trail *trail_create(trail_info *info);
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void trail_add_segment( trail *trailp, vec3d *pos , const matrix* orient );
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void trail_set_segment( trail *trailp, vec3d *pos );
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void trail_object_died( trail *trailp );
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int trail_stamp_elapsed( trail *trailp );
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void trail_set_stamp( trail *trailp );
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#endif //_TRAILS_H
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