OOExplosionCloudEntity.m

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/*
 
OOExplosionCloudEntity.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 "OOExplosionCloudEntity.h"
#import "Universe.h"
#import "PlayerEntity.h"
#import "OOColor.h"
#import "OOTexture.h"
#import "OOGraphicsResetManager.h"
#import "OOCollectionExtractors.h"
 
#define kExplosionCloudDuration     0.9
#define kGrowthRateFactor           1.5f
#define kExplosionCloudAlpha        0.85f
#define kExplosionBrightnessMult    1.0f
#define kExplosionDefaultSize       2.5f
 
// keys for plist file
static NSString * const kExplosionAlpha         = @"alpha";
static NSString * const kExplosionBrightness    = @"brightness";
static NSString * const kExplosionColors        = @"color_order";
static NSString * const kExplosionCount         = @"count";
static NSString * const kExplosionDuration      = @"duration";
static NSString * const kExplosionGrowth        = @"growth_rate";
static NSString * const kExplosionSize          = @"size";
static NSString * const kExplosionSpread        = @"spread";
static NSString * const kExplosionTexture       = @"texture";
 
 
@interface OOExplosionCloudEntity (OOPrivate)
- (id) initExplosionCloudWithEntity:(Entity *)entity size:(float)size andSettings:(NSDictionary *)settings;
@end 
 
@implementation OOExplosionCloudEntity
 
- (id) initExplosionCloudWithEntity:(Entity *)entity size:(float)size andSettings:(NSDictionary *)settings
{
    unsigned i;
    unsigned maxCount = [UNIVERSE detailLevel] <= DETAIL_LEVEL_SHADERS ? 10 : 25;
    HPVector pos = [entity position];
    Vector vel = [entity velocity];
 
    if (settings == nil) {
        _settings = [[NSDictionary dictionary] retain];
    } else {
        _settings = [settings retain];
    }
 
    unsigned count = [_settings oo_unsignedIntForKey:kExplosionCount defaultValue:25];
    if (count > maxCount) {
        count = maxCount;
    }
 
    if (size == 0.0) {
        size = [entity collisionRadius]*[_settings oo_floatForKey:kExplosionSize defaultValue:kExplosionDefaultSize];
    }
 
    _growthRate = [_settings oo_floatForKey:kExplosionGrowth defaultValue:kGrowthRateFactor] * size;
    _alpha = [_settings oo_floatForKey:kExplosionAlpha defaultValue:kExplosionCloudAlpha];
    _brightnessMult = [_settings oo_floatForKey:kExplosionBrightness defaultValue:kExplosionBrightnessMult];
    if (_brightnessMult < 1.0f)  _brightnessMult = 1.0f;
    _cloudDuration = [_settings oo_doubleForKey:kExplosionDuration defaultValue:kExplosionCloudDuration];
 
    GLfloat spread = [_settings oo_floatForKey:kExplosionSpread defaultValue:1.0];
 
    NSString *textureFile = [_settings oo_stringForKey:kExplosionTexture defaultValue:@"oolite-particle-cloud2.png"];
    
    _texture = [[OOTexture textureWithName:textureFile
                                  inFolder:@"Textures"
                                   options:kOOTextureMinFilterMipMap | kOOTextureMagFilterLinear | kOOTextureAlphaMask
                                anisotropy:kOOTextureDefaultAnisotropy
                                   lodBias:0.0] retain];    
    if (_texture == nil) 
    {
        [self release];
        return nil;
    }
 
    GLfloat baseColor[4] = {1.0,1.0,1.0,1.0};
 
    if (magnitude2(vel) > 1000000)
    {
        // slow down rapidly translating explosions
        vel = vector_multiply_scalar(vector_normal(vel),1000);
    }
 
    if ((self = [super initWithPosition:pos velocity:vel count:count minSpeed:size*0.8f*spread maxSpeed:size*1.2f*spread duration:_cloudDuration baseColor:baseColor]))
    {
        NSString *color_order = [_settings oo_stringForKey:kExplosionColors defaultValue:@"rgb"];
        
        for (i=0;i<count;i++) 
        {
            if ([color_order isEqualToString:@"white"]) {
                // grey
                _particleColor[i][0] = _particleColor[i][1] = _particleColor[i][2] = randf();
            } else {
                float c1 = randf();
                float c2 = randf();
                float c3 = randf();
                if (c2 > c1) {
                    c2 = c1;
                }
                if (c3 > c2) {
                    c3 = c2;
                }
                if ([color_order isEqualToString:@"rgb"]) 
                {
                    _particleColor[i][0] = c1;
                    _particleColor[i][1] = c2;
                    _particleColor[i][2] = c3;
                }
                else if ([color_order isEqualToString:@"rbg"]) 
                {
                    _particleColor[i][0] = c1;
                    _particleColor[i][1] = c3;
                    _particleColor[i][2] = c2;
                }
                else if ([color_order isEqualToString:@"grb"]) 
                {
                    _particleColor[i][0] = c2;
                    _particleColor[i][1] = c1;
                    _particleColor[i][2] = c3;
                }
                else if ([color_order isEqualToString:@"gbr"]) 
                {
                    _particleColor[i][0] = c3;
                    _particleColor[i][1] = c1;
                    _particleColor[i][2] = c2;
                }
                else if ([color_order isEqualToString:@"brg"]) 
                {
                    _particleColor[i][0] = c2;
                    _particleColor[i][1] = c3;
                    _particleColor[i][2] = c1;
                }
                else if ([color_order isEqualToString:@"bgr"]) 
                {
                    _particleColor[i][0] = c3;
                    _particleColor[i][1] = c2;
                    _particleColor[i][2] = c1;
                }
 
            }
            
            _particleColor[i][0] *= _brightnessMult;
            _particleColor[i][1] *= _brightnessMult;
            _particleColor[i][2] *= _brightnessMult;
            _particleColor[i][3] = _alpha;
        }
    }
    return self;
}
 
 
- (void) dealloc 
{
    DESTROY(_texture);
    DESTROY(_settings);
    [super dealloc];
}
 
 
+ (instancetype) explosionCloudFromEntity:(Entity *)entity withSettings:(NSDictionary *)settings
{
    return [[[self alloc] initExplosionCloudWithEntity:entity size:0 andSettings:settings] autorelease];
}
 
 
+ (instancetype) explosionCloudFromEntity:(Entity *)entity withSize:(float)size andSettings:(NSDictionary *)settings
{
    return [[[self alloc] initExplosionCloudWithEntity:entity size:size andSettings:settings] autorelease];
}
 
 
- (void) update:(OOTimeDelta)delta_t
{
    [super update:delta_t];
    
    // Fade out.
    GLfloat     fadeRate = _count * _brightnessMult / 25.0;
    unsigned    i, count = _count;
    GLfloat     (*particleColor)[4] = _particleColor;
    
    float newAlpha = _alpha * (1-(_timePassed / _cloudDuration));
    NSString *color_order = [_settings oo_stringForKey:kExplosionColors defaultValue:@"rgb"];
    NSUInteger primary = 0, secondary = 1, tertiary = 2;
            
    if ([color_order isEqualToString:@"rgb"]) 
    {
        primary = 0;
        secondary = 1;
        tertiary = 2;
    }
    else if ([color_order isEqualToString:@"rbg"]) 
    {
        primary = 0;
        secondary = 2;
        tertiary = 1;
    }
    else if ([color_order isEqualToString:@"grb"]) 
    {
        primary = 1;
        secondary = 0;
        tertiary = 2;
    }
    else if ([color_order isEqualToString:@"gbr"]) 
    {
        primary = 1;
        secondary = 2;
        tertiary = 0;
    }
    else if ([color_order isEqualToString:@"brg"]) 
    {
        primary = 2;
        secondary = 0;
        tertiary = 1;
    }
    else if ([color_order isEqualToString:@"bgr"]) 
    {
        primary = 2;
        secondary = 1;
        tertiary = 0;
    }
 
 
    float fdelta_t = delta_t;
    for (i=0;i<count;i++) {
        
        _particleSize[i] += delta_t * _growthRate;
 
        particleColor[i][3] = newAlpha;
        if (![color_order isEqualToString:@"white"])
        {
 
            if (particleColor[i][tertiary] > 0.0f) // fade blue (white to yellow)
            {
                particleColor[i][tertiary] -= fdelta_t * 0.5f * fadeRate;
                if (particleColor[i][tertiary] < 0.0f)
                {
                    particleColor[i][tertiary] = 0.0f;
                }
            }
            else if (particleColor[i][secondary] > 0.0f) // fade green (yellow to red)
            {
                particleColor[i][secondary] -= fdelta_t * fadeRate;
                if (particleColor[i][secondary] < 0.0f)
                {
                    particleColor[i][secondary] = 0.0f;
                }
            }
            else if (particleColor[i][primary] > 0.0f) // fade red (red to black)
            {
                particleColor[i][primary] -= fdelta_t * 2.0f * fadeRate;
                if (particleColor[i][primary] < 0.0f)
                {
                    particleColor[i][primary] = 0.0f;
                }
            }
 
        }
    }
    
}
 
 
- (OOTexture *) texture
{
    return _texture;
}
 
@end