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/* sparkle2d.cc
manage 2D sparkles (in 2D mode, of course)
Copyright (C) 2000 Mathias Broxvall
Yannick Perret
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sparkle2d.h"
#include "glHelp.h"
/* structure for */
typedef struct _glitter {
float pos[3];
float speed[3];
float color[4];
float size;
float age;
struct _glitter *next, *prev;
} Glitter;
// initialize sparkle module
Sparkle2D::Sparkle2D() {
// just be sure that this field is empty
this->sparkle_first = NULL;
}
// destroy
Sparkle2D::~Sparkle2D() {
// remove all remaining sparkle
clear();
}
// remove all entries
void Sparkle2D::clear() {
Sparkle *tmp = sparkle_first;
while (tmp != NULL) {
Sparkle *tmp2 = tmp->next;
delete tmp;
tmp = tmp2;
}
sparkle_first = NULL;
}
// remove a particular sparkle from the list
void Sparkle2D::remove_sparkle(Sparkle *sparkle) {
if (sparkle == NULL) return;
if (sparkle->next != NULL) sparkle->next->prev = sparkle->prev;
if (sparkle->prev != NULL)
sparkle->prev->next = sparkle->next;
else
sparkle_first = sparkle->next;
delete sparkle;
}
/*
* create and insert a glitter
*/
Sparkle *Sparkle2D::create_and_insert() {
Sparkle *tmp = new Sparkle;
if (tmp == NULL) { return (NULL); }
tmp->next = sparkle_first;
tmp->prev = NULL;
if (sparkle_first != NULL) { sparkle_first->prev = tmp; }
sparkle_first = tmp;
return (tmp);
}
/*
* add a new sparkle
*/
int Sparkle2D::add(float px, float py, float vx, float vy, float ttl, float size, float r,
float g, float b, float a) {
Sparkle *sparkle;
if ((sparkle = create_and_insert()) == NULL) return (0);
sparkle->pos[0] = px;
sparkle->pos[1] = py;
sparkle->speed[0] = vx;
sparkle->speed[1] = vy;
sparkle->color[0] = r;
sparkle->color[1] = g;
sparkle->color[2] = b;
sparkle->color[3] = a;
sparkle->size = size;
sparkle->ttl = ttl;
sparkle->age = 0.;
return (1);
}
int Sparkle2D::add(float pos[2], float speed[2], float ttl, float size, float color[4]) {
Sparkle *sparkle;
if ((sparkle = create_and_insert()) == NULL) return (0);
sparkle->pos[0] = pos[0];
sparkle->pos[1] = pos[1];
sparkle->speed[0] = speed[0];
sparkle->speed[1] = speed[1];
sparkle->color[0] = color[0];
sparkle->color[1] = color[1];
sparkle->color[2] = color[2];
sparkle->color[3] = color[3];
sparkle->size = size;
sparkle->ttl = ttl;
sparkle->age = 0.;
return (1);
}
int Sparkle2D::add(float pos[2], float speed[2], float ttl, float size) {
float col[4] = {1., 0.9, 0.1, 0.9};
return add(pos, speed, ttl, size, col);
}
int Sparkle2D::add(float pos[2], float speed[2], float ttl) {
float col[4] = {1., 0.9, 0.1, 0.9};
return add(pos, speed, ttl, 1., col);
}
int Sparkle2D::add(float pos[2], float ttl) {
float col[4] = {1., 0.9, 0.1, 0.9};
float speed[2];
speed[0] = 2. * frandom() - 1.;
speed[1] = 2. * frandom() - 1.;
return add(pos, speed, ttl, 1., col);
}
int Sparkle2D::add(float pos[2]) {
float col[4] = {1., 0.9, 0.1, 0.9};
float speed[2];
speed[0] = 2. * frandom() - 1.;
speed[1] = 2. * frandom() - 1.;
return add(pos, speed, 0.5 + frandom() * 2., 1., col);
}
/*
* draw existing glitters
*/
void Sparkle2D::draw() {
Sparkle *skl = sparkle_first;
while (skl != NULL) {
float age = skl->age;
if (age >= 0.) {
float tmp;
if (age < 0.1) {
tmp = 1. - age * 10.;
} else
tmp = age / skl->ttl;
float alpha = 1.0 - tmp;
float *clr = skl->color;
tmp = alpha * alpha;
float ex = tmp * skl->size * 0.8;
float ey = tmp * skl->size * 1. + (0.02 * age);
float *pos = skl->pos;
draw2DRectangle(pos[0] - ex, pos[1] - ey, 2 * ex, 2 * ey, 0., 0., 1., 1., clr[0], clr[1],
clr[2], clr[3] * alpha, textureGlitter);
}
skl = skl->next;
}
}
/*
* update existing glitters
*/
void Sparkle2D::tick(Real t) {
Sparkle *skl = sparkle_first;
while (skl != NULL) {
skl->age += t;
if (skl->age > skl->ttl) {
Sparkle *tmp = skl;
skl = skl->next;
remove_sparkle(tmp);
continue;
}
/* update pos */
skl->pos[0] += skl->speed[0] * t;
skl->pos[1] += skl->speed[1] * t;
skl->speed[1] += 200.0 * t; // MB. fix for varying framerates
skl = skl->next;
}
}
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