opengl
#import
/**
* @class Panorama View
* @author Robby Kraft
* @date 8/24/13
*
* @availability iOS (5.0 and later)
*
* @discussion a dynamic GLKView with a touch and motion sensor interface to align and immerse the perspective inside an equirectangular panorama projection
*/
@interface PanoramaView : GLKView
-(id) init; // recommended init method
-(void) draw; // place in GLKViewController's glkView:drawInRect:
/// set image
-(void) setImage:(UIImage*)image;
/// set image by path or bundle - will check at both
-(void) setImageWithName:(NSString*)fileName;
/* orientation */
/// forward vector axis (into the screen)
@property (nonatomic, readonly) GLKVector3 lookVector;
/// forward horizontal azimuth (-π to π)
@property (nonatomic, readonly) float lookAzimuth;
/// forward vertical altitude (-.5π to .5π)
@property (nonatomic, readonly) float lookAltitude;
// At this point, it's still recommended to activate either OrientToDevice or TouchToPan, not both
// it's possible to have them simultaneously, but the effect is confusing and disorienting
/// Activates accelerometer + gyro orientation
@property (nonatomic) BOOL orientToDevice;
/// Enables UIPanGestureRecognizer to affect view orientation
@property (nonatomic) BOOL touchToPan;
/// Fixes up-vector during panning. (trade off: no panning past the poles)
//@property (nonatomic) BOOL preventHeadTilt;
/**
* Align Z coordinate axis (into the screen) to a GLKVector.
* (due to a fixed up-vector, flipping will occur at the poles)
*
* @param GLKVector3 can be non-normalized
*/
-(void) orientToVector:(GLKVector3)vector;
/**
* Align Z coordinate axis (into the screen) to azimuth and altitude.
* (due to a fixed up-vector, flipping will occur at the poles)
*
* @param Azimuth(-π to π) Altitude(-.5π to .5π)
*/
-(void) orientToAzimuth:(float) azimuth Altitude:(float)altitude;
/* projection & touches */
@property (nonatomic, readonly) NSSet *touches;
@property (nonatomic, readonly) NSInteger numberOfTouches;
/// Field of view in DEGREES
@property (nonatomic) float fieldOfView;
/// Enables UIPinchGestureRecognizer to affect FieldOfView
@property (nonatomic) BOOL pinchToZoom;
/// Dynamic overlay of latitude and longitude intersection lines for all touches
@property (nonatomic) BOOL showTouches;
/**
* Convert a 3D world-coordinate (specified by a vector from the origin) to a 2D on-screen coordinate
*
* @param GLKVector3 coordinate location from origin. Use with CGRectContainsPoint( [[UIScreen mainScreen] bounds], screenPoint )
* @return a screen pixel coordinate representation of a 3D world coordinate
*/
-(CGPoint) screenLocationFromVector:(GLKVector3)vector;
/**
* Converts a 2D on-screen coordinate to a vector in 3D space pointing out from the origin
*
* @param CGPoint screen coordinate
* @return GLKVector3 vector pointing outward from origin
*/
-(GLKVector3) vectorFromScreenLocation:(CGPoint)point;
/**
* Converts a 2D on-screen coordinate to a pixel (x,y) of the loaded panorama image
*
* @param CGPoint screen coordinate
* @return CGPoint image coordinate in pixels. If no image, between 0.0 and 1.0
*/
-(CGPoint) imagePixelAtScreenLocation:(CGPoint)point;
/**
* Hit-detection for all active touches
*
* @param CGRect defined in image pixel coordinates
* @return YES if touch is inside CGRect, NO otherwise
*/
-(BOOL) touchInRect:(CGRect)rect;
@end
//
// PanoramaView.m
// Panorama
//
// Created by Robby Kraft on 8/24/13.
// Copyright (c) 2013 Robby Kraft. All rights reserved.
//
#import
#import
#import
#import "PanoramaView.h"
#define FPS 60
#define FOV_MIN 1
#define FOV_MAX 155
#define Z_NEAR 0.1f
#define Z_FAR 100.0f
// LINEAR for smoothing, NEAREST for pixelized
#define IMAGE_SCALING GL_LINEAR // GL_NEAREST, GL_LINEAR
// this appears to be the best way to grab orientation. if this becomes formalized, just make sure the orientations match
#define SENSOR_ORIENTATION [[UIApplication sharedApplication] statusBarOrientation] //enum 1(NORTH) 2(SOUTH) 3(EAST) 4(WEST)
// this really should be included in GLKit
GLKQuaternion GLKQuaternionFromTwoVectors(GLKVector3 u, GLKVector3 v){
GLKVector3 w = GLKVector3CrossProduct(u, v);
GLKQuaternion q = GLKQuaternionMake(w.x, w.y, w.z, GLKVector3DotProduct(u, v));
q.w += GLKQuaternionLength(q);
return GLKQuaternionNormalize(q);
}
@interface Sphere : NSObject
-(bool) execute;
-(id) init:(GLint)stacks slices:(GLint)slices radius:(GLfloat)radius textureFile:(NSString *)textureFile;
-(void) swapTexture:(NSString*)textureFile;
-(void) swapTextureWithImage:(UIImage*)image;
-(CGPoint) getTextureSize;
@end
@interface PanoramaView (){
Sphere *sphere, *meridians;
CMMotionManager *motionManager;
UIPinchGestureRecognizer *pinchGesture;
UIPanGestureRecognizer *panGesture;
GLKMatrix4 _projectionMatrix, _attitudeMatrix, _offsetMatrix;
float _aspectRatio;
GLfloat circlePoints[64*3]; // meridian lines
}
@end
@implementation PanoramaView
-(id) init{
// it appears that iOS already automatically does this switch, stored in UIScreen mainscreen bounds
// CGRect frame = [[UIScreen mainScreen] bounds];
// if(SENSOR_ORIENTATION == 3 || SENSOR_ORIENTATION == 4){
// return [self initWithFrame:CGRectMake(frame.origin.x, frame.origin.y, frame.size.height, frame.size.width)];
// } else{
// return [self initWithFrame:CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, frame.size.height)];
// }
return [self initWithFrame:[[UIScreen mainScreen] bounds]];
}
- (id)initWithFrame:(CGRect)frame{
EAGLContext *context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
[EAGLContext setCurrentContext:context];
self.context = context;
return [self initWithFrame:frame context:context];
}
-(id) initWithFrame:(CGRect)frame context:(EAGLContext *)context{
self = [super initWithFrame:frame];
if (self) {
[self initDevice];
[self initOpenGL:context];
sphere = [[Sphere alloc] init:48 slices:48 radius:10.0 textureFile:nil];
meridians = [[Sphere alloc] init:48 slices:48 radius:8.0 textureFile:@"equirectangular-projection-lines.png"];
}
return self;
}
-(void) didMoveToSuperview{
// this breaks MVC, but useful for setting GLKViewController's frame rate
UIResponder *responder = self;
while (![responder isKindOfClass:[GLKViewController class]]) {
responder = [responder nextResponder];
if (responder == nil){
break;
}
}
if([responder respondsToSelector:@selector(setPreferredFramesPerSecond:)])
[(GLKViewController*)responder setPreferredFramesPerSecond:FPS];
}
-(void) initDevice{
motionManager = [[CMMotionManager alloc] init];
pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchHandler:)];
[pinchGesture setEnabled:NO];
[self addGestureRecognizer:pinchGesture];
panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panHandler:)];
[panGesture setMaximumNumberOfTouches:1];
[panGesture setEnabled:NO];
[self addGestureRecognizer:panGesture];
}
-(void)setFieldOfView:(float)fieldOfView{
_fieldOfView = fieldOfView;
[self rebuildProjectionMatrix];
}
-(void) setImageWithName:(NSString*)fileName{
[sphere swapTexture:fileName];
}
-(void) setImage:(UIImage *)image {
[sphere swapTextureWithImage:image];
}
-(void) setTouchToPan:(BOOL)touchToPan{
_touchToPan = touchToPan;
[panGesture setEnabled:_touchToPan];
}
-(void) setPinchToZoom:(BOOL)pinchToZoom{
_pinchToZoom = pinchToZoom;
[pinchGesture setEnabled:_pinchToZoom];
}
-(void) setOrientToDevice:(BOOL)orientToDevice{
_orientToDevice = orientToDevice;
if(motionManager.isDeviceMotionAvailable){
if(_orientToDevice)
[motionManager startDeviceMotionUpdates];
else
[motionManager stopDeviceMotionUpdates];
}
}
#pragma mark- OPENGL
-(void)initOpenGL:(EAGLContext*)context{
[(CAEAGLLayer*)self.layer setOpaque:NO];
_aspectRatio = self.frame.size.width/self.frame.size.height;
_fieldOfView = 45 + 45 * atanf(_aspectRatio); // hell ya
[self rebuildProjectionMatrix];
_attitudeMatrix = GLKMatrix4Identity;
_offsetMatrix = GLKMatrix4Identity;
[self customGL];
[self makeLatitudeLines];
}
-(void)rebuildProjectionMatrix{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
GLfloat frustum = Z_NEAR * tanf(_fieldOfView*0.00872664625997); // pi/180/2
_projectionMatrix = GLKMatrix4MakeFrustum(-frustum, frustum, -frustum/_aspectRatio, frustum/_aspectRatio, Z_NEAR, Z_FAR);
glMultMatrixf(_projectionMatrix.m);
glViewport(0, 0, self.frame.size.width, self.frame.size.height);
glMatrixMode(GL_MODELVIEW);
}
-(void) customGL{
glMatrixMode(GL_MODELVIEW);
// glEnable(GL_CULL_FACE);
// glCullFace(GL_FRONT);
// glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
-(void)draw{
static GLfloat whiteColor[] = {1.0f, 1.0f, 1.0f, 1.0f};
static GLfloat clearColor[] = {0.0f, 0.0f, 0.0f, 0.0f};
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix(); // begin device orientation
_attitudeMatrix = GLKMatrix4Multiply([self getDeviceOrientationMatrix], _offsetMatrix);
[self updateLook];
glMultMatrixf(_attitudeMatrix.m);
glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, whiteColor); // panorama at full color
[sphere execute];
glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, clearColor);
// [meridians execute]; // semi-transparent texture overlay (15° meridian lines)
//TODO: add any objects here to make them a part of the virtual reality
// glPushMatrix();
// // object code
// glPopMatrix();
// touch lines
if(_showTouches && _numberOfTouches){
glColor4f(1.0f, 1.0f, 1.0f, 0.5f);
for(int i = 0; i < [[_touches allObjects] count]; i++){
glPushMatrix();
CGPoint touchPoint = CGPointMake([(UITouch*)[[_touches allObjects] objectAtIndex:i] locationInView:self].x,
[(UITouch*)[[_touches allObjects] objectAtIndex:i] locationInView:self].y);
[self drawHotspotLines:[self vectorFromScreenLocation:touchPoint inAttitude:_attitudeMatrix]];
glPopMatrix();
}
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
}
glPopMatrix(); // end device orientation
}
#pragma mark- ORIENTATION
-(GLKMatrix4) getDeviceOrientationMatrix{
if(_orientToDevice && [motionManager isDeviceMotionActive]){
CMRotationMatrix a = [[[motionManager deviceMotion] attitude] rotationMatrix];
// arrangements of mappings of sensor axis to virtual axis (columns)
// and combinations of 90 degree rotations (rows)
if(SENSOR_ORIENTATION == 4){
return GLKMatrix4Make( a.m21,-a.m11, a.m31, 0.0f,
a.m23,-a.m13, a.m33, 0.0f,
-a.m22, a.m12,-a.m32, 0.0f,
0.0f , 0.0f , 0.0f , 1.0f);
}
if(SENSOR_ORIENTATION == 3){
return GLKMatrix4Make(-a.m21, a.m11, a.m31, 0.0f,
-a.m23, a.m13, a.m33, 0.0f,
a.m22,-a.m12,-a.m32, 0.0f,
0.0f , 0.0f , 0.0f , 1.0f);
}
if(SENSOR_ORIENTATION == 2){
return GLKMatrix4Make(-a.m11,-a.m21, a.m31, 0.0f,
-a.m13,-a.m23, a.m33, 0.0f,
a.m12, a.m22,-a.m32, 0.0f,
0.0f , 0.0f , 0.0f , 1.0f);
}
return GLKMatrix4Make(a.m11, a.m21, a.m31, 0.0f,
a.m13, a.m23, a.m33, 0.0f,
-a.m12,-a.m22,-a.m32, 0.0f,
0.0f , 0.0f , 0.0f , 1.0f);
}
else
return GLKMatrix4Identity;
}
-(void) orientToVector:(GLKVector3)v{
_attitudeMatrix = GLKMatrix4MakeLookAt(0, 0, 0, v.x, v.y, v.z, 0, 1, 0);
[self updateLook];
}
-(void) orientToAzimuth:(float)azimuth Altitude:(float)altitude{
[self orientToVector:GLKVector3Make(-cosf(azimuth), sinf(altitude), sinf(azimuth))];
}
-(void) updateLook{
_lookVector = GLKVector3Make(-_attitudeMatrix.m02,
-_attitudeMatrix.m12,
-_attitudeMatrix.m22);
_lookAzimuth = atan2f(_lookVector.x, -_lookVector.z);
_lookAltitude = asinf(_lookVector.y);
}
-(CGPoint) imagePixelAtScreenLocation:(CGPoint)point{
return [self imagePixelFromVector:[self vectorFromScreenLocation:point inAttitude:_attitudeMatrix]];
}
-(CGPoint) imagePixelFromVector:(GLKVector3)vector{
CGPoint pxl = CGPointMake((M_PI-atan2f(-vector.z, -vector.x))/(2*M_PI), acosf(vector.y)/M_PI);
CGPoint tex = [sphere getTextureSize];
// if no texture exists, returns between 0.0 - 1.0
if(!(tex.x == 0.0f && tex.y == 0.0f)){
pxl.x *= tex.x;
pxl.y *= tex.y;
}
return pxl;
}
-(GLKVector3) vectorFromScreenLocation:(CGPoint)point{
return [self vectorFromScreenLocation:point inAttitude:_attitudeMatrix];
}
-(GLKVector3) vectorFromScreenLocation:(CGPoint)point inAttitude:(GLKMatrix4)matrix{
GLKMatrix4 inverse = GLKMatrix4Invert(GLKMatrix4Multiply(_projectionMatrix, matrix), nil);
GLKVector4 screen = GLKVector4Make(2.0*(point.x/self.frame.size.width-.5),
2.0*(.5-point.y/self.frame.size.height),
1.0, 1.0);
// if (SENSOR_ORIENTATION == 3 || SENSOR_ORIENTATION == 4)
// screen = GLKVector4Make(2.0*(screenTouch.x/self.frame.size.height-.5),
// 2.0*(.5-screenTouch.y/self.frame.size.width),
// 1.0, 1.0);
GLKVector4 vec = GLKMatrix4MultiplyVector4(inverse, screen);
return GLKVector3Normalize(GLKVector3Make(vec.x, vec.y, vec.z));
}
-(CGPoint) screenLocationFromVector:(GLKVector3)vector{
GLKMatrix4 matrix = GLKMatrix4Multiply(_projectionMatrix, _attitudeMatrix);
GLKVector3 screenVector = GLKMatrix4MultiplyVector3(matrix, vector);
return CGPointMake( (screenVector.x/screenVector.z/2.0 + 0.5) * self.frame.size.width,
(0.5-screenVector.y/screenVector.z/2) * self.frame.size.height );
}
-(BOOL) computeScreenLocation:(CGPoint*)location fromVector:(GLKVector3)vector inAttitude:(GLKMatrix4)matrix{
//This method returns whether the point is before or behind the screen.
GLKVector4 screenVector;
GLKVector4 vector4;
if(location == NULL)
return NO;
matrix = GLKMatrix4Multiply(_projectionMatrix, matrix);
vector4 = GLKVector4Make(vector.x, vector.y, vector.z, 1);
screenVector = GLKMatrix4MultiplyVector4(matrix, vector4);
location->x = (screenVector.x/screenVector.w/2.0 + 0.5) * self.frame.size.width;
location->y = (0.5-screenVector.y/screenVector.w/2) * self.frame.size.height;
return (screenVector.z >= 0);
}
#pragma mark- TOUCHES
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
_touches = event.allTouches;
_numberOfTouches = event.allTouches.count;
}
-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
_touches = event.allTouches;
_numberOfTouches = event.allTouches.count;
}
-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
_touches = event.allTouches;
_numberOfTouches = 0;
}
-(BOOL)touchInRect:(CGRect)rect{
if(_numberOfTouches){
bool found = false;
for(int i = 0; i < [[_touches allObjects] count]; i++){
CGPoint touchPoint = CGPointMake([(UITouch*)[[_touches allObjects] objectAtIndex:i] locationInView:self].x,
[(UITouch*)[[_touches allObjects] objectAtIndex:i] locationInView:self].y);
found |= CGRectContainsPoint(rect, [self imagePixelAtScreenLocation:touchPoint]);
}
return found;
}
return false;
}
-(void)pinchHandler:(UIPinchGestureRecognizer*)sender{
_numberOfTouches = sender.numberOfTouches;
static float zoom;
if([sender state] == 1)
zoom = _fieldOfView;
if([sender state] == 2){
CGFloat newFOV = zoom / [sender scale];
if(newFOV < FOV_MIN) newFOV = FOV_MIN;
else if(newFOV > FOV_MAX) newFOV = FOV_MAX;
[self setFieldOfView:newFOV];
}
if([sender state] == 3){
_numberOfTouches = 0;
}
}
-(void) panHandler:(UIPanGestureRecognizer*)sender{
static GLKVector3 touchVector;
if([sender state] == 1){
touchVector = [self vectorFromScreenLocation:[sender locationInView:sender.view] inAttitude:_offsetMatrix];
}
else if([sender state] == 2){
GLKVector3 nowVector = [self vectorFromScreenLocation:[sender locationInView:sender.view] inAttitude:_offsetMatrix];
GLKQuaternion q = GLKQuaternionFromTwoVectors(touchVector, nowVector);
_offsetMatrix = GLKMatrix4Multiply(_offsetMatrix, GLKMatrix4MakeWithQuaternion(q));
// in progress for preventHeadTilt
// GLKMatrix4 mat = GLKMatrix4Multiply(_offsetMatrix, GLKMatrix4MakeWithQuaternion(q));
// _offsetMatrix = GLKMatrix4MakeLookAt(0, 0, 0, -mat.m02, -mat.m12, -mat.m22, 0, 1, 0);
}
else{
_numberOfTouches = 0;
}
}
#pragma mark- MERIDIANS
-(void) makeLatitudeLines{
for(int i = 0; i < 64; i++){
circlePoints[i*3+0] = -sinf(M_PI*2/64.0f*i);
circlePoints[i*3+1] = 0.0f;
circlePoints[i*3+2] = cosf(M_PI*2/64.0f*i);
}
}
-(void)drawHotspotLines:(GLKVector3)touchLocation{
glLineWidth(2.0f);
float scale = sqrtf(1-powf(touchLocation.y,2));
glPushMatrix();
glScalef(scale, 1.0f, scale);
glTranslatef(0, touchLocation.y, 0);
glDisableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, circlePoints);
glDrawArrays(GL_LINE_LOOP, 0, 64);
glDisableClientState(GL_VERTEX_ARRAY);
glPopMatrix();
glPushMatrix();
glRotatef(-atan2f(-touchLocation.z, -touchLocation.x)*180/M_PI, 0, 1, 0);
glRotatef(90, 1, 0, 0);
glDisableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, circlePoints);
glDrawArrays(GL_LINE_STRIP, 0, 33);
glDisableClientState(GL_VERTEX_ARRAY);
glPopMatrix();
}
-(void) dealloc{
[EAGLContext setCurrentContext:nil];
}
@end
@interface Sphere (){
// from Touch Fighter by Apple
// in Pro OpenGL ES for iOS
// by Mike Smithwick Jan 2011 pg. 78
GLKTextureInfo *m_TextureInfo;
GLfloat *m_TexCoordsData;
GLfloat *m_VertexData;
GLfloat *m_NormalData;
GLint m_Stacks, m_Slices;
GLfloat m_Scale;
}
-(GLKTextureInfo *) loadTextureFromBundle:(NSString *) filename;
-(GLKTextureInfo *) loadTextureFromPath:(NSString *) path;
-(GLKTextureInfo *) loadTextureFromImage:(UIImage *) image;
@end
@implementation Sphere
-(id) init:(GLint)stacks slices:(GLint)slices radius:(GLfloat)radius textureFile:(NSString *)textureFile{
// modifications:
// flipped(inverted) texture coords across the Z
// vertices rotated 90deg
if(textureFile != nil) m_TextureInfo = [self loadTextureFromBundle:textureFile];
m_Scale = radius;
if((self = [super init])){
m_Stacks = stacks;
m_Slices = slices;
m_VertexData = nil;
m_TexCoordsData = nil;
// Vertices
GLfloat *vPtr = m_VertexData = (GLfloat*)malloc(sizeof(GLfloat) * 3 * ((m_Slices*2+2) * (m_Stacks)));
// Normals
GLfloat *nPtr = m_NormalData = (GLfloat*)malloc(sizeof(GLfloat) * 3 * ((m_Slices*2+2) * (m_Stacks)));
GLfloat *tPtr = nil;
tPtr = m_TexCoordsData = (GLfloat*)malloc(sizeof(GLfloat) * 2 * ((m_Slices*2+2) * (m_Stacks)));
unsigned int phiIdx, thetaIdx;
// Latitude
for(phiIdx = 0; phiIdx < m_Stacks; phiIdx++){
//starts at -pi/2 goes to pi/2
//the first circle
float phi0 = M_PI * ((float)(phiIdx+0) * (1.0/(float)(m_Stacks)) - 0.5);
//second one
float phi1 = M_PI * ((float)(phiIdx+1) * (1.0/(float)(m_Stacks)) - 0.5);
float cosPhi0 = cos(phi0);
float sinPhi0 = sin(phi0);
float cosPhi1 = cos(phi1);
float sinPhi1 = sin(phi1);
float cosTheta, sinTheta;
//longitude
for(thetaIdx = 0; thetaIdx < m_Slices; thetaIdx++){
float theta = -2.0*M_PI * ((float)thetaIdx) * (1.0/(float)(m_Slices - 1));
cosTheta = cos(theta+M_PI*.5);
sinTheta = sin(theta+M_PI*.5);
//get x-y-x of the first vertex of stack
vPtr[0] = m_Scale*cosPhi0 * cosTheta;
vPtr[1] = m_Scale*sinPhi0;
vPtr[2] = m_Scale*(cosPhi0 * sinTheta);
//the same but for the vertex immediately above the previous one.
vPtr[3] = m_Scale*cosPhi1 * cosTheta;
vPtr[4] = m_Scale*sinPhi1;
vPtr[5] = m_Scale*(cosPhi1 * sinTheta);
nPtr[0] = cosPhi0 * cosTheta;
nPtr[1] = sinPhi0;
nPtr[2] = cosPhi0 * sinTheta;
nPtr[3] = cosPhi1 * cosTheta;
nPtr[4] = sinPhi1;
nPtr[5] = cosPhi1 * sinTheta;
if(tPtr!=nil){
GLfloat texX = (float)thetaIdx * (1.0f/(float)(m_Slices-1));
tPtr[0] = 1.0-texX;
tPtr[1] = (float)(phiIdx + 0) * (1.0f/(float)(m_Stacks));
tPtr[2] = 1.0-texX;
tPtr[3] = (float)(phiIdx + 1) * (1.0f/(float)(m_Stacks));
}
vPtr += 2*3;
nPtr += 2*3;
if(tPtr != nil) tPtr += 2*2;
}
//Degenerate triangle to connect stacks and maintain winding order
vPtr[0] = vPtr[3] = vPtr[-3];
vPtr[1] = vPtr[4] = vPtr[-2];
vPtr[2] = vPtr[5] = vPtr[-1];
nPtr[0] = nPtr[3] = nPtr[-3];
nPtr[1] = nPtr[4] = nPtr[-2];
nPtr[2] = nPtr[5] = nPtr[-1];
if(tPtr != nil){
tPtr[0] = tPtr[2] = tPtr[-2];
tPtr[1] = tPtr[3] = tPtr[-1];
}
}
}
return self;
}
-(void) dealloc{
GLuint name = m_TextureInfo.name;
glDeleteTextures(1, &name);
if(m_TexCoordsData != nil){
free(m_TexCoordsData);
}
if(m_NormalData != nil){
free(m_NormalData);
}
if(m_VertexData != nil){
free(m_VertexData);
}
}
-(bool) execute{
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_VERTEX_ARRAY);
if(m_TexCoordsData != nil){
glEnable(GL_TEXTURE_2D);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
if(m_TextureInfo != 0)
glBindTexture(GL_TEXTURE_2D, m_TextureInfo.name);
glTexCoordPointer(2, GL_FLOAT, 0, m_TexCoordsData);
}
glVertexPointer(3, GL_FLOAT, 0, m_VertexData);
glNormalPointer(GL_FLOAT, 0, m_NormalData);
glDrawArrays(GL_TRIANGLE_STRIP, 0, (m_Slices +1) * 2 * (m_Stacks-1)+2);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisable(GL_TEXTURE_2D);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
return true;
}
-(GLKTextureInfo *) loadTextureFromBundle:(NSString *) filename{
if(!filename) return nil;
NSString *path = [[NSBundle mainBundle] pathForResource:filename ofType:NULL];
return [self loadTextureFromPath:path];
}
-(GLKTextureInfo *) loadTextureFromPath:(NSString *) path{
if(!path) return nil;
NSError *error;
GLKTextureInfo *info;
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], GLKTextureLoaderOriginBottomLeft, nil];
info=[GLKTextureLoader textureWithContentsOfFile:path options:options error:&error];
glBindTexture(GL_TEXTURE_2D, info.name);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, IMAGE_SCALING);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, IMAGE_SCALING);
return info;
}
-(GLKTextureInfo *) loadTextureFromImage:(UIImage *) image {
if(!image) return nil;
NSError *error;
GLKTextureInfo *info;
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES],GLKTextureLoaderOriginBottomLeft, nil];
info = [GLKTextureLoader textureWithCGImage:image.CGImage options:options error:&error];
glBindTexture(GL_TEXTURE_2D, info.name);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, IMAGE_SCALING);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, IMAGE_SCALING);
return info;
}
-(void)swapTexture:(NSString*)textureFile{
GLuint name = m_TextureInfo.name;
glDeleteTextures(1, &name);
if ([[NSFileManager defaultManager] fileExistsAtPath:textureFile]) {
m_TextureInfo = [self loadTextureFromPath:textureFile];
}
else {
m_TextureInfo = [self loadTextureFromBundle:textureFile];
}
}
-(void)swapTextureWithImage:(UIImage*)image {
GLuint name = m_TextureInfo.name;
glDeleteTextures(1, &name);
m_TextureInfo = [self loadTextureFromImage:image];
}
-(CGPoint)getTextureSize{
if(m_TextureInfo){
return CGPointMake(m_TextureInfo.width, m_TextureInfo.height);
}
else{
return CGPointZero;
}
}
@end