gstreamer/gst/goom/flying_stars_fx.c

#include "goom_fx.h"
#include "goom_plugin_info.h"
#include "goom_tools.h"

#include "mathtools.h"

/* TODO:-- FAIRE PROPREMENT... BOAH... */
#define NCOL 15

/*static const int colval[] = {
0xfdf6f5,
0xfae4e4,
0xf7d1d1,
0xf3b6b5,
0xefa2a2,
0xec9190,
0xea8282,
0xe87575,
0xe46060,
0xe14b4c,
0xde3b3b,
0xdc2d2f,
0xd92726,
0xd81619,
0xd50c09,
0
};
*/
static const int colval[] = {
  0x1416181a,
  0x1419181a,
  0x141f181a,
  0x1426181a,
  0x142a181a,
  0x142f181a,
  0x1436181a,
  0x142f1819,
  0x14261615,
  0x13201411,
  0x111a100a,
  0x0c180508,
  0x08100304,
  0x00050101,
  0x0
};


/* The different modes of the visual FX.
 * Put this values on fx_mode */
#define FIREWORKS_FX 0
#define RAIN_FX 1
#define FOUNTAIN_FX 2
#define LAST_FX 3

typedef struct _FS_STAR
{
  float x, y;
  float vx, vy;
  float ax, ay;
  float age, vage;
} Star;

typedef struct _FS_DATA
{

  int fx_mode;
  int nbStars;

  int maxStars;
  Star *stars;

  float min_age;
  float max_age;

  PluginParam min_age_p;
  PluginParam max_age_p;
  PluginParam nbStars_p;
  PluginParam nbStars_limit_p;
  PluginParam fx_mode_p;

  PluginParameters params;
} FSData;

static void
fs_init (VisualFX * _this, PluginInfo * info)
{

  FSData *data;

  data = (FSData *) malloc (sizeof (FSData));

  data->fx_mode = FIREWORKS_FX;
  data->maxStars = 4096;
  data->stars = (Star *) malloc (data->maxStars * sizeof (Star));
  data->nbStars = 0;

  data->max_age_p = secure_i_param ("Fireworks Smallest Bombs");
  IVAL (data->max_age_p) = 80;
  IMIN (data->max_age_p) = 0;
  IMAX (data->max_age_p) = 100;
  ISTEP (data->max_age_p) = 1;

  data->min_age_p = secure_i_param ("Fireworks Largest Bombs");
  IVAL (data->min_age_p) = 99;
  IMIN (data->min_age_p) = 0;
  IMAX (data->min_age_p) = 100;
  ISTEP (data->min_age_p) = 1;

  data->nbStars_limit_p = secure_i_param ("Max Number of Particules");
  IVAL (data->nbStars_limit_p) = 512;
  IMIN (data->nbStars_limit_p) = 0;
  IMAX (data->nbStars_limit_p) = data->maxStars;
  ISTEP (data->nbStars_limit_p) = 64;

  data->fx_mode_p = secure_i_param ("FX Mode");
  IVAL (data->fx_mode_p) = data->fx_mode;
  IMIN (data->fx_mode_p) = 1;
  IMAX (data->fx_mode_p) = 3;
  ISTEP (data->fx_mode_p) = 1;

  data->nbStars_p = secure_f_feedback ("Number of Particules (% of Max)");

  data->params = plugin_parameters ("Particule System", 7);
  data->params.params[0] = &data->fx_mode_p;
  data->params.params[1] = &data->nbStars_limit_p;
  data->params.params[2] = 0;
  data->params.params[3] = &data->min_age_p;
  data->params.params[4] = &data->max_age_p;
  data->params.params[5] = 0;
  data->params.params[6] = &data->nbStars_p;

  _this->params = &data->params;
  _this->fx_data = (void *) data;
}

static void
fs_free (VisualFX * _this)
{
  free (_this->fx_data);
}


/**
 * Cree une nouvelle 'bombe', c'est a dire une particule appartenant a une fusee d'artifice.
 */
static void
addABomb (FSData * fs, int mx, int my, float radius, float vage, float gravity,
    PluginInfo * info)
{

  int i = fs->nbStars;
  float ro;
  int theta;

  if (fs->nbStars >= fs->maxStars)
    return;
  fs->nbStars++;

  fs->stars[i].x = mx;
  fs->stars[i].y = my;

  ro = radius * (float) goom_irand (info->gRandom, 100) / 100.0f;
  ro *= (float) goom_irand (info->gRandom, 100) / 100.0f + 1.0f;
  theta = goom_irand (info->gRandom, 256);

  fs->stars[i].vx = ro * cos256[theta];
  fs->stars[i].vy = -0.2f + ro * sin256[theta];

  fs->stars[i].ax = 0;
  fs->stars[i].ay = gravity;

  fs->stars[i].age = 0;
  if (vage < fs->min_age)
    vage = fs->min_age;
  fs->stars[i].vage = vage;
}


/**
 * Met a jour la position et vitesse d'une particule.
 */
static void
updateStar (Star * s)
{
  s->x += s->vx;
  s->y += s->vy;
  s->vx += s->ax;
  s->vy += s->ay;
  s->age += s->vage;
}


/**
 * Ajoute de nouvelles particules au moment d'un evenement sonore.
 */
static void
fs_sound_event_occured (VisualFX * _this, PluginInfo * info)
{

  FSData *data = (FSData *) _this->fx_data;
  int i;

  int max = (int) ((1.0f + info->sound.goomPower) * goom_irand (info->gRandom,
          150)) + 100;
  float radius =
      (1.0f + info->sound.goomPower) * (float) (goom_irand (info->gRandom,
          150) + 50) / 300;
  int mx;
  int my;
  float vage, gravity = 0.02f;

  switch (data->fx_mode) {
    case FIREWORKS_FX:
    {
      double dx, dy;

      do {
        mx = goom_irand (info->gRandom, info->screen.width);
        my = goom_irand (info->gRandom, info->screen.height);
        dx = (mx - info->screen.width / 2);
        dy = (my - info->screen.height / 2);
      } while (dx * dx + dy * dy <
          (info->screen.height / 2) * (info->screen.height / 2));
      vage = data->max_age * (1.0f - info->sound.goomPower);
    }
      break;
    case RAIN_FX:
      mx = goom_irand (info->gRandom, info->screen.width);
      if (mx > info->screen.width / 2)
        mx = info->screen.width;
      else
        mx = 0;
      my = -(info->screen.height / 3) - goom_irand (info->gRandom,
          info->screen.width / 3);
      radius *= 1.5;
      vage = 0.002f;
      break;
    case FOUNTAIN_FX:
      my = info->screen.height + 2;
      vage = 0.001f;
      radius += 1.0f;
      mx = info->screen.width / 2;
      gravity = 0.04f;
      break;
    default:
      return;
      /* my = i R A N D (info->screen.height); vage = 0.01f; */
  }

  radius *= info->screen.height / 200.0f;       /* why 200 ? because the FX was developped on 320x200 */
  max *= info->screen.height / 200.0f;

  if (info->sound.timeSinceLastBigGoom < 1) {
    radius *= 1.5;
    max *= 2;
  }
  for (i = 0; i < max; ++i)
    addABomb (data, mx, my, radius, vage, gravity, info);
}


/**
 * Main methode of the FX.
 */
static void
fs_apply (VisualFX * _this, Pixel * src, Pixel * dest, PluginInfo * info)
{

  int i;
  int col;
  FSData *data = (FSData *) _this->fx_data;

  /* Get the new parameters values */
  data->min_age = 1.0f - (float) IVAL (data->min_age_p) / 100.0f;
  data->max_age = 1.0f - (float) IVAL (data->max_age_p) / 100.0f;
  FVAL (data->nbStars_p) = (float) data->nbStars / (float) data->maxStars;
  data->nbStars_p.change_listener (&data->nbStars_p);
  data->maxStars = IVAL (data->nbStars_limit_p);
  data->fx_mode = IVAL (data->fx_mode_p);

  /* look for events */
  if (info->sound.timeSinceLastGoom < 1) {
    fs_sound_event_occured (_this, info);
    if (goom_irand (info->gRandom, 20) == 1) {
      IVAL (data->fx_mode_p) = goom_irand (info->gRandom, (LAST_FX * 3));
      data->fx_mode_p.change_listener (&data->fx_mode_p);
    }
  }

  /* update particules */
  for (i = 0; i < data->nbStars; ++i) {
    updateStar (&data->stars[i]);

    /* dead particule */
    if (data->stars[i].age >= NCOL)
      continue;

    /* choose the color of the particule */
    col = colval[(int) data->stars[i].age];

    /* draws the particule */
    info->methods.draw_line (dest, (int) data->stars[i].x,
        (int) data->stars[i].y,
        (int) (data->stars[i].x - data->stars[i].vx * 6),
        (int) (data->stars[i].y - data->stars[i].vy * 6), col,
        (int) info->screen.width, (int) info->screen.height);
    info->methods.draw_line (dest, (int) data->stars[i].x,
        (int) data->stars[i].y,
        (int) (data->stars[i].x - data->stars[i].vx * 2),
        (int) (data->stars[i].y - data->stars[i].vy * 2), col,
        (int) info->screen.width, (int) info->screen.height);
  }

  /* look for dead particules */
  for (i = 0; i < data->nbStars;) {

    if ((data->stars[i].x > info->screen.width + 64)
        || ((data->stars[i].vy >= 0)
            && (data->stars[i].y - 16 * data->stars[i].vy >
                info->screen.height))
        || (data->stars[i].x < -64)
        || (data->stars[i].age >= NCOL)) {
      data->stars[i] = data->stars[data->nbStars - 1];
      data->nbStars--;
    } else
      ++i;
  }
}

VisualFX
flying_star_create (void)
{
  VisualFX vfx = {
    fs_init,
    fs_free,
    fs_apply,
    NULL
  };
  return vfx;
}