OOBreakPatternEntity.m

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/*
 
OOBreakPatternEntity.m
 
Entity implementing tunnel effect for hyperspace and stations.
 
 
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 "OOBreakPatternEntity.h"
#import "OOColor.h"
#import "Universe.h"
#import "OOMacroOpenGL.h"
 
 
@interface OOBreakPatternEntity (Private)
 
- (void) setInnerColorComponents:(GLfloat[4])color1 outerColorComponents:(GLfloat[4])color2;
 
@end
 
 
@implementation OOBreakPatternEntity
 
- (id) initWithPolygonSides:(NSUInteger)sides startAngle:(float)startAngleDegrees aspectRatio:(float)aspectRatio
{
    sides = MIN(MAX((NSUInteger)3, sides), (NSUInteger)kOOBreakPatternMaxSides);
    
    if ((self = [super init]))
    {
        _vertexCount = (sides + 1) * 2;
        float angle = startAngleDegrees * M_PI / 180.0f;
        float deltaAngle = M_PI * 2.0f / sides;
        float xAspect = fmin(1.0f, aspectRatio);
        float yAspect = fmin(1.0f, 1.0f / aspectRatio);
        
        NSUInteger vi = 0;
        for (NSUInteger i = 0; i < sides; i++)
        {
            float s = sin(angle) * xAspect;
            float c = cos(angle) * yAspect;
            
            _vertexPosition[vi++] = (Vector) { s * 50, c * 50, -40 };
            _vertexPosition[vi++] = (Vector) { s * 40, c * 40, 0 };
            
            angle += deltaAngle;
        }
        
        _vertexPosition[vi++] = _vertexPosition[0];
        _vertexPosition[vi++] = _vertexPosition[1];
        
        [self setInnerColorComponents:(GLfloat[]){ 1.0f, 0.0f, 0.0f, 0.5f }
                 outerColorComponents:(GLfloat[]){ 0.0f, 0.0f, 1.0f, 0.25f }];
        
        [self setStatus:STATUS_EFFECT];
        [self setScanClass:CLASS_NO_DRAW];
        
        isImmuneToBreakPatternHide = YES;
    }
    
    return self;
}
 
 
+ (instancetype) breakPatternWithPolygonSides:(NSUInteger)sides startAngle:(float)startAngleDegrees aspectRatio:(float)aspectRatio
{
    return [[[self alloc] initWithPolygonSides:sides startAngle:startAngleDegrees aspectRatio:aspectRatio] autorelease];
}
 
 
- (void) setInnerColor:(OOColor *)color1 outerColor:(OOColor *)color2
{
    GLfloat inner[4], outer[4];
    [color1 getRed:&inner[0] green:&inner[1] blue:&inner[2] alpha:&inner[3]];
    [color2 getRed:&outer[0] green:&outer[1] blue:&outer[2] alpha:&outer[3]];
    [self setInnerColorComponents:inner outerColorComponents:outer];
}
 
 
- (void) setInnerColorComponents:(GLfloat[4])color1 outerColorComponents:(GLfloat[4])color2
{
    GLfloat *colors[2] = { color1, color2 };
    
    for (NSUInteger i = 0; i < _vertexCount; i++)
    {
        GLfloat *color = colors[i & 1];
        memcpy(&_vertexColor[i], color, sizeof (GLfloat) * 4);
    }
}
 
 
- (void) setLifetime:(double)lifetime
{
    _lifetime = lifetime;
}
 
 
- (void) update:(OOTimeDelta) delta_t
{
    [super update:delta_t];
    
    _lifetime -= BREAK_PATTERN_RING_SPEED * delta_t;
    if (_lifetime < 0.0)
    {
        [UNIVERSE removeEntity:self];
    }
}
 
 
- (void) drawImmediate:(bool)immediate translucent:(bool)translucent
{
    // check if has been hidden.
    if (!isImmuneToBreakPatternHide) return;
    
    if (translucent || immediate)
    {
        OO_ENTER_OPENGL();
        OOSetOpenGLState(OPENGL_STATE_OPAQUE);
        
        OOGL(glDisable(GL_LIGHTING));
        OOGL(glDisable(GL_TEXTURE_2D));
        OOGL(glEnable(GL_BLEND));
        OOGL(glDepthMask(GL_FALSE));
        OOGL(glDisableClientState(GL_NORMAL_ARRAY));
        
        OOGL(glVertexPointer(3, GL_FLOAT, 0, _vertexPosition));
        OOGL(glEnableClientState(GL_COLOR_ARRAY));
        OOGL(glColorPointer(4, GL_FLOAT, 0, _vertexColor));
        
        OOGL(glDrawArrays(GL_TRIANGLE_STRIP, 0, _vertexCount));
        
        OOGL(glEnable(GL_LIGHTING));
        OOGL(glEnable(GL_TEXTURE_2D));
        OOGL(glDisable(GL_BLEND));
        OOGL(glDepthMask(GL_TRUE));
        OOGL(glEnableClientState(GL_NORMAL_ARRAY));
        OOGL(glDisableClientState(GL_COLOR_ARRAY));
        
        OOVerifyOpenGLState();
        OOCheckOpenGLErrors(@"OOBreakPatternEntity after drawing %@", self);
    }
}
 
 
- (BOOL) canCollide
{
    return NO;
}
 
 
- (BOOL) isBreakPattern
{
    return YES;
}
 
@end
 
 
@implementation Entity (OOBreakPatternEntity)
 
- (BOOL) isBreakPattern
{
    return NO;
}
 
@end