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