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-/* Starshatter OpenSource Distribution
- Copyright (c) 1997-2004, Destroyer Studios LLC.
- All Rights Reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are met:
-
- * Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright notice,
- this list of conditions and the following disclaimer in the documentation
- and/or other materials provided with the distribution.
- * Neither the name "Destroyer Studios" nor the names of its contributors
- may be used to endorse or promote products derived from this software
- without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- POSSIBILITY OF SUCH DAMAGE.
-
- SUBSYSTEM: nGenEx.lib
- FILE: Particles.cpp
- AUTHOR: John DiCamillo
-
-
- OVERVIEW
- ========
- Particle Burst class
-*/
-
-#include "MemDebug.h"
-#include "Particles.h"
-#include "Projector.h"
-#include "Light.h"
-#include "Bitmap.h"
-#include "Game.h"
-#include "Random.h"
-
-// +--------------------------------------------------------------------+
-
-inline float randf() { return (rand()-16384.0f)/32768.0f; }
-
-// +--------------------------------------------------------------------+
-
-Particles::Particles(Bitmap* bitmap, int np, const Vec3& base_loc, const Vec3& vel,
-float bspeed, float dr, float s, float bloom, float dec, float rate,
-bool cont, bool trail, bool rise, int a, int nframes)
-: nparts(np), base_speed(bspeed), max_speed(bspeed*3.0f),
-drag(dr), min_scale(s), max_scale(bloom), decay(dec),
-release_rate(rate), continuous(cont), trailing(trail), rising(rise),
-blend(a), extra(0.0f), point_sprite(0), emitting(true)
-{
- MoveTo(base_loc);
- ref_loc = base_loc;
-
- trans = true;
- luminous = true;
- shadow = false;
- nverts = nparts;
-
- if (max_scale < min_scale)
- max_scale = min_scale;
-
- velocity = new(__FILE__,__LINE__) Point[nverts];
- part_loc = new(__FILE__,__LINE__) Point[nverts];
- release = new(__FILE__,__LINE__) Point[nverts];
- intensity = new(__FILE__,__LINE__) float[nverts];
- timestamp = new(__FILE__,__LINE__) float[nverts];
- scale = new(__FILE__,__LINE__) float[nverts];
- angle = new(__FILE__,__LINE__) float[nverts];
- frame = new(__FILE__,__LINE__) BYTE[nverts];
-
- float speed = base_speed;
-
- for (int i = 0; i < nverts; i++) {
- intensity[i] = 1.0f;
- timestamp[i] = (float) (Game::GameTime() / 1000.0);
- scale[i] = (float) (min_scale);
- angle[i] = (float) (Random(0, 2*PI));
- frame[i] = 0;
-
- part_loc[i] = Point();
- release[i] = ref_loc;
- velocity[i] = RandomVector(speed);
- velocity[i] += vel;
-
- if (speed < max_speed)
- speed += (float) Random(max_speed/15.0, max_speed/5.0);
- else
- speed = base_speed;
- }
-
- radius = 15000.0f;
-
- if (decay > 2)
- decay /= 256.0f;
-
- if (nparts < 8) {
- nverts = 1;
- }
-
- else if (nparts > 50 || continuous) {
- nverts = (int) (nparts * 0.125 * release_rate);
- }
-
- point_sprite = new(__FILE__,__LINE__) Sprite(bitmap, nframes);
- point_sprite->Scale(s);
- point_sprite->SetBlendMode(blend);
- point_sprite->SetFrameRate(nframes * decay);
-}
-
-Particles::~Particles()
-{
- delete point_sprite;
- delete [] velocity;
- delete [] part_loc;
- delete [] release;
- delete [] timestamp;
- delete [] intensity;
- delete [] scale;
- delete [] angle;
- delete [] frame;
-}
-
-// +--------------------------------------------------------------------+
-
-void Particles::ExecFrame(double seconds)
-{
- point_sprite->Update();
-
- ref_loc = loc;
- radius += max_speed * (float) seconds;
-
- float scaled_drag = (float) exp(-drag * seconds);
- float scale_inc = (float) ((max_scale-min_scale)*seconds*2);
-
- for (int i = 0; i < nverts; i++) {
- part_loc[i] += velocity[i] * (float) seconds;
-
- if (rising) {
- part_loc[i].y += (float) ((randf() + 1) * scale[i] * 80 * seconds);
- }
-
- // do the (chunky) blooming effect:
- if (max_scale > 0 && scale[i] < max_scale) {
- scale[i] += scale_inc * (float) ((i%3)/3.0);
- }
-
- double rho = angle[i];
- int rot = i%4;
- switch (rot) {
- case 0: rho += seconds * 0.13; break;
- case 1: rho -= seconds * 0.11; break;
- case 2: rho += seconds * 0.09; break;
- case 3: rho -= seconds * 0.07; break;
- default: break;
- }
-
- angle[i] = (float) rho;
- intensity[i] -= (float) (decay * seconds);
-
- if (point_sprite->NumFrames() > 1) {
- double age = Game::GameTime()/1000.0 - timestamp[i];
- int n = (int) (age * point_sprite->FrameRate());
-
- if (n >= point_sprite->NumFrames())
- n = point_sprite->NumFrames() - 1;
-
- frame[i] = n;
- }
-
- velocity[i] *= scaled_drag;
- }
-
- if (nverts < nparts && emitting) {
- int nv = nverts;
- double delta = nparts * release_rate * seconds;
- int new_parts = (int) (delta + extra);
- extra = (float) (delta + extra - new_parts);
- nverts += new_parts;
-
- if (nverts > nparts)
- nverts = nparts;
-
- for (int i = nv; i < nverts; i++) {
- intensity[i] = 1;
- timestamp[i] = (float) (Game::GameTime() / 1000.0);
- scale[i] = (float) (min_scale);
- angle[i] = (float) (Random(0, 2*PI));
- frame[i] = 0;
- part_loc[i] = Point();
- release[i] = ref_loc;
- }
- }
-
- if (nverts > nparts)
- nverts = nparts;
-
- // recycle dead particles:
- if (continuous) {
- float speed = base_speed;
-
- for (int i = 0; i < nverts; i++) {
- if (intensity[i] <= 0) {
- part_loc[i] = Point();
- release[i] = ref_loc;
-
- intensity[i] = 1;
- timestamp[i] = (float) (Game::GameTime() / 1000.0);
- scale[i] = (float) (min_scale);
- angle[i] = (float) (PI * rand() / 16384.0);
- frame[i] = 0;
- velocity[i] = RandomVector(speed);
-
- if (speed < max_speed)
- speed += (float) Random(max_speed/25.0, max_speed/18.0);
- else
- speed = base_speed;
- }
- }
- }
-}
-
-// +--------------------------------------------------------------------+
-
-bool
-Particles::CheckVisibility(Projector& projector)
-{
- float base = 256;
-
- if (point_sprite && point_sprite->Frame())
- base = (float) point_sprite->Frame()->Width();
-
- float particle_radius = base * max_scale;
-
- if (projector.IsVisible( Location(), Radius()) &&
- projector.ApparentRadius(Location(), particle_radius) > 1) {
-
- visible = true;
- }
- else {
- visible = false;
- }
-
- return visible;
-}
-
-// +--------------------------------------------------------------------+
-
-void
-Particles::Render(Video* video, DWORD flags)
-{
- if (hidden || !visible || !video || !point_sprite)
- return;
-
- if (blend == 2 && !(flags & Graphic::RENDER_ALPHA))
- return;
-
- if (blend == 4 && !(flags & Graphic::RENDER_ADDITIVE))
- return;
-
- for (int i = 0; i < nverts; i++) {
- Point vloc;
-
- if (trailing) {
- vloc = part_loc[i] + release[i] - offset;
- }
- else {
- vloc = part_loc[i] + loc;
- }
-
- point_sprite->MoveTo(vloc);
- point_sprite->SetShade(intensity[i]);
- point_sprite->Rescale(scale[i]);
- point_sprite->SetAngle(angle[i]);
- point_sprite->SetFrameIndex(frame[i]);
-
- point_sprite->Render(video, flags);
- }
-}
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