Line data    Source code

       1           0 : /*
       2             : 
       3             : OOFlashEffectEntity.m
       4             : 
       5             : 
       6             : Oolite
       7             : Copyright (C) 2004-2013 Giles C Williams and contributors
       8             : 
       9             : This program is free software; you can redistribute it and/or
      10             : modify it under the terms of the GNU General Public License
      11             : as published by the Free Software Foundation; either version 2
      12             : of the License, or (at your option) any later version.
      13             : 
      14             : This program is distributed in the hope that it will be useful,
      15             : but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17             : GNU General Public License for more details.
      18             : 
      19             : You should have received a copy of the GNU General Public License
      20             : along with this program; if not, write to the Free Software
      21             : Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
      22             : MA 02110-1301, USA.
      23             : 
      24             : */
      25             : 
      26             : #import "OOFlashEffectEntity.h"
      27             : #import "Universe.h"
      28             : #import "PlayerEntity.h"
      29             : #import "OOColor.h"
      30             : #import "OOTexture.h"
      31             : #import "OOGraphicsResetManager.h"
      32             : 
      33             : 
      34           0 : #define kLaserFlashDuration                     0.3f
      35           0 : #define kExplosionFlashDuration         0.4f
      36           0 : #define kGrowthRateFactor                       150.0f  // if average flashSize is 80 then this is 12000
      37           0 : #define kMinExplosionGrowth                     600.0f
      38           0 : #define kLaserFlashInitialSize          1.0f
      39           0 : #define kExplosionFlashAlpha            0.5f
      40             : 
      41           0 : static OOTexture *sFlashTexture = nil;
      42             : 
      43             : 
      44             : @interface OOFlashEffectEntity (Private)
      45             : 
      46             : // Designated initializer.
      47           0 : - (id) initWithPosition:(HPVector)pos size:(float)size color:(OOColor *)color duration:(float)duration;
      48             : 
      49           0 : + (void) resetGraphicsState;
      50             : 
      51           0 : - (void) performUpdate:(OOTimeDelta)delta_t;
      52             : 
      53             : @end
      54             : 
      55             : 
      56             : @implementation OOFlashEffectEntity
      57             : 
      58           0 : - (id) initExplosionFlashWithPosition:(HPVector)pos velocity:(Vector)vel size:(float)size
      59             : {
      60             :         if ((self = [self initWithPosition:pos size:size color:[OOColor whiteColor] duration:kExplosionFlashDuration]))
      61             :         {
      62             :                 _growthRate = fmax(_growthRate, kMinExplosionGrowth);
      63             :                 _alpha = kExplosionFlashAlpha;
      64             :                 [self setVelocity:vel];
      65             :         }
      66             :         return self;
      67             : }
      68             : 
      69             : 
      70           0 : - (id) initLaserFlashWithPosition:(HPVector)pos velocity:(Vector)vel color:(OOColor *)color
      71             : {
      72             :         if ((self = [self initWithPosition:pos size:kLaserFlashInitialSize color:color duration:kLaserFlashDuration]))
      73             :         {
      74             :                 [self setVelocity:vel];
      75             :                 _alpha = 1.0f;
      76             :         }
      77             :         return self;
      78             : }
      79             : 
      80             : 
      81             : + (instancetype) explosionFlashFromEntity:(Entity *)entity
      82             : {
      83             :         return [[[self alloc] initExplosionFlashWithPosition:[entity position] velocity:[entity velocity] size:[entity collisionRadius]] autorelease];
      84             : }
      85             : 
      86             : 
      87             : + (instancetype) laserFlashWithPosition:(HPVector)pos velocity:(Vector)vel color:(OOColor *)color
      88             : {
      89             :         return [[[self alloc] initLaserFlashWithPosition:pos velocity:vel color:color] autorelease];
      90             : }
      91             : 
      92             : 
      93           0 : - (id) initWithPosition:(HPVector)pos size:(float)size color:(OOColor *)color duration:(float)duration
      94             : {
      95             :         if ((self = [super initWithDiameter:size]))
      96             :         {
      97             :                 [self setPosition:pos];
      98             :                 _duration = duration;
      99             :                 _growthRate = kGrowthRateFactor * size;
     100             :                 [self setColor:color alpha:1.0f];
     101             :                 assert([self collisionRadius] == 0 && [self energy] == 0 && magnitude([self velocity]) == 0);
     102             :         }
     103             :         return self;
     104             : }
     105             : 
     106             : 
     107           0 : - (void) update:(OOTimeDelta)delta_t
     108             : {
     109             :         [super update:delta_t];
     110             :         
     111             :         float tf = _duration * 0.667f;
     112             :         float tf1 = _duration - tf;
     113             :         
     114             :         // Scale up.
     115             :         _diameter += delta_t * _growthRate;
     116             :         
     117             :         // Fade in and out.
     118             :         OOTimeDelta lifeTime = [self timeElapsedSinceSpawn];
     119             :         _colorComponents[3] = _alpha * ((lifeTime < tf) ? (lifeTime / tf) : (_duration - lifeTime) / tf1);
     120             :         
     121             :         // Disappear as necessary.
     122             :         if (lifeTime > _duration)  [UNIVERSE removeEntity:self];
     123             : }
     124             : 
     125             : 
     126           0 : - (OOTexture *) texture
     127             : {
     128             :         if (sFlashTexture == nil)  [OOFlashEffectEntity setUpTexture];
     129             :         return sFlashTexture;
     130             : }
     131             : 
     132             : 
     133             : + (void) setUpTexture
     134             : {
     135             :         if (sFlashTexture == nil)
     136             :         {
     137             :                 sFlashTexture = [[OOTexture textureWithName:@"oolite-particle-flash.png"
     138             :                                                                                    inFolder:@"Textures"
     139             :                                                                                         options:kOOTextureMinFilterMipMap | kOOTextureMagFilterLinear | kOOTextureAlphaMask
     140             :                                                                                  anisotropy:kOOTextureDefaultAnisotropy
     141             :                                                                                         lodBias:0.0] retain];
     142             :                 [[OOGraphicsResetManager sharedManager] registerClient:(id<OOGraphicsResetClient>)[OOFlashEffectEntity class]];
     143             :         }
     144             : }
     145             : 
     146             : 
     147           0 : + (void) resetGraphicsState
     148             : {
     149             :         [sFlashTexture release];
     150             :         sFlashTexture = nil;
     151             : }
     152             : 
     153             : @end