OOFlashEffectEntity.m

Go to the documentation of this file.

/*
 
OOFlashEffectEntity.m
 
 
Oolite
Copyright (C) 2004-2013 Giles C Williams and contributors
 
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., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA.
 
*/
 
#import "OOFlashEffectEntity.h"
#import "Universe.h"
#import "PlayerEntity.h"
#import "OOColor.h"
#import "OOTexture.h"
#import "OOGraphicsResetManager.h"
 
 
#define kLaserFlashDuration         0.3f
#define kExplosionFlashDuration     0.4f
#define kGrowthRateFactor           150.0f  // if average flashSize is 80 then this is 12000
#define kMinExplosionGrowth         600.0f
#define kLaserFlashInitialSize      1.0f
#define kExplosionFlashAlpha        0.5f
 
static OOTexture *sFlashTexture = nil;
 
 
@interface OOFlashEffectEntity (Private)
 
// Designated initializer.
- (id) initWithPosition:(HPVector)pos size:(float)size color:(OOColor *)color duration:(float)duration;
 
+ (void) resetGraphicsState;
 
- (void) performUpdate:(OOTimeDelta)delta_t;
 
@end
 
 
@implementation OOFlashEffectEntity
 
- (id) initExplosionFlashWithPosition:(HPVector)pos velocity:(Vector)vel size:(float)size
{
    if ((self = [self initWithPosition:pos size:size color:[OOColor whiteColor] duration:kExplosionFlashDuration]))
    {
        _growthRate = fmax(_growthRate, kMinExplosionGrowth);
        _alpha = kExplosionFlashAlpha;
        [self setVelocity:vel];
    }
    return self;
}
 
 
- (id) initLaserFlashWithPosition:(HPVector)pos velocity:(Vector)vel color:(OOColor *)color
{
    if ((self = [self initWithPosition:pos size:kLaserFlashInitialSize color:color duration:kLaserFlashDuration]))
    {
        [self setVelocity:vel];
        _alpha = 1.0f;
    }
    return self;
}
 
 
+ (instancetype) explosionFlashFromEntity:(Entity *)entity
{
    return [[[self alloc] initExplosionFlashWithPosition:[entity position] velocity:[entity velocity] size:[entity collisionRadius]] autorelease];
}
 
 
+ (instancetype) laserFlashWithPosition:(HPVector)pos velocity:(Vector)vel color:(OOColor *)color
{
    return [[[self alloc] initLaserFlashWithPosition:pos velocity:vel color:color] autorelease];
}
 
 
- (id) initWithPosition:(HPVector)pos size:(float)size color:(OOColor *)color duration:(float)duration
{
    if ((self = [super initWithDiameter:size]))
    {
        [self setPosition:pos];
        _duration = duration;
        _growthRate = kGrowthRateFactor * size;
        [self setColor:color alpha:1.0f];
        assert([self collisionRadius] == 0 && [self energy] == 0 && magnitude([self velocity]) == 0);
    }
    return self;
}
 
 
- (void) update:(OOTimeDelta)delta_t
{
    [super update:delta_t];
    
    float tf = _duration * 0.667f;
    float tf1 = _duration - tf;
    
    // Scale up.
    _diameter += delta_t * _growthRate;
    
    // Fade in and out.
    OOTimeDelta lifeTime = [self timeElapsedSinceSpawn];
    _colorComponents[3] = _alpha * ((lifeTime < tf) ? (lifeTime / tf) : (_duration - lifeTime) / tf1);
    
    // Disappear as necessary.
    if (lifeTime > _duration)  [UNIVERSE removeEntity:self];
}
 
 
- (OOTexture *) texture
{
    if (sFlashTexture == nil)  [OOFlashEffectEntity setUpTexture];
    return sFlashTexture;
}
 
 
+ (void) setUpTexture
{
    if (sFlashTexture == nil)
    {
        sFlashTexture = [[OOTexture textureWithName:@"oolite-particle-flash.png"
                                           inFolder:@"Textures"
                                            options:kOOTextureMinFilterMipMap | kOOTextureMagFilterLinear | kOOTextureAlphaMask
                                         anisotropy:kOOTextureDefaultAnisotropy
                                            lodBias:0.0] retain];
        [[OOGraphicsResetManager sharedManager] registerClient:(id<OOGraphicsResetClient>)[OOFlashEffectEntity class]];
    }
}
 
 
+ (void) resetGraphicsState
{
    [sFlashTexture release];
    sFlashTexture = nil;
}
 
@end