#import
#include
#include
//Color Depth
#define BITS_PER_PIXEL 32.0
//Depth of Z Buffer
#define DEPTH_SIZE 32.0
//Frames per Second
#define DEFAULT_FRAME_RATE 60.0f
@interface MyOpenGLView : NSOpenGLView
{
//The timer that runs 60 times/second
NSTimer *renderTimer;
}
//Keep track of rotation angle
float rotTri = 0.0f;
//Initialization function for OpenGL
- (void)initGL;
//Function to draw a pyramid
static void drawAnObject();
@end
//Run at start
-(void)awakeFromNib
{
NSOpenGLPixelFormat *nsglFormat;
//Specify Attributes to allow screen to use various buffers
NSOpenGLPixelFormatAttribute attr[] =
{
//Enable Z sorting (make sure that polygons in front will overlap those in back)
NSOpenGLPFADoubleBuffer,
//Use Hardware Acceleration for graphics
NSOpenGLPFAAccelerated,
//Specify color depth
NSOpenGLPFAColorSize, BITS_PER_PIXEL,
//Specify Z depth
NSOpenGLPFADepthSize, DEPTH_SIZE,
//Anti-Aliasing:
NSOpenGLPFASampleBuffers, 8,
NSOpenGLPFASamples, 32,
NSOpenGLPFAMultisample,
0
};
//Set pixel format to include the attributes specified in the array attr[]
nsglFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];
//Use the pixel format for the openGL view
[self setPixelFormat:nsglFormat];
//Initialize the view
[self initGL];
//Redraw view when window changes size
[self setPostsFrameChangedNotifications: YES];
//Update every 60 times a second
renderTimer = [NSTimer timerWithTimeInterval:1.0/60.0
target:self
selector:@selector(timerFired:)
userInfo:nil
repeats:YES];
//Activate timer to fire
[[NSRunLoop currentRunLoop] addTimer:renderTimer
forMode:NSDefaultRunLoopMode];
//Ensure timer fires during resize
[[NSRunLoop currentRunLoop] addTimer:renderTimer
forMode:NSEventTrackingRunLoopMode];
}
//Action to run when the timer is fired
- (void)timerFired:(id)sender
{
//Increase the rotation angle
rotTri += 1.0f;
//Tell the screen it needs to refresh
[self setNeedsDisplay:YES];
}
//Setup OpenGL view
- (void)initGL
{
printf("initGL\n");
// Synchronize buffer swaps with vertical refresh rate
GLint swapInt = 1;
[[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
//Apply Future Operations to The Projection Matrix
glMatrixMode(GL_PROJECTION);
//Reset The Projection Matrix
glLoadIdentity();
// Calculate The Aspect Ratio Of The Window
gluPerspective(45.0f,640.0f/480.0f,0.1f,100.0f);
//Select The Modelview Matrix
glMatrixMode(GL_MODELVIEW);
// Reset The Modelview Matrix
glLoadIdentity();
glShadeModel(GL_SMOOTH); //Smooth Shading
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); //set clear color to black
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Test To Do
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations
}
//Function to draw a pyramid
static void drawAnObject()
{
//Draw a 3-sided pyramid
glBegin(GL_TRIANGLES);
//DAC (counterclockwise points)
glColor3f(1.0f, 0.0f,0.0f); //RED
glVertex3f(1.0f, -1.0f,-0.798f); //D
glColor3f(0.0f, 1.0f,0.0f); //GREEN
glVertex3f(0.0f, -0.333f,0.798f); //A
glColor3f(0.0f, 0.0f,1.0f); //BLUE
glVertex3f(-1.0f, -1.0f,-0.798f); //C
//DCB
glColor3f(1.0f, 0.0f,0.0f); //RED
glVertex3f(1.0f, -1.0f,-0.798f); //D
glColor3f(0.0f, 0.0f,1.0f); //BLUE
glVertex3f(-1.0f, -1.0f,-0.798f); //C
glColor3f(1.0f, 0.0f,1.0f); //Violet
glVertex3f(0.0f,1.0f,-0.798f); //B
//CAB
glColor3f(0.0f, 0.0f,1.0f); //BLUE
glVertex3f(-1.0f, -1.0f,-0.798f); //C
glColor3f(0.0f, 1.0f,0.0f); //GREEN
glVertex3f(0.0f, -0.333f,0.798f); //A
glColor3f(1.0f, 0.0f,1.0f); //Violet
glVertex3f(0.0f,1.0f,-0.798f); //B
//BAD
glColor3f(1.0f, 0.0f,1.0f); //Violet
glVertex3f(0.0f,1.0f,-0.798f); //B
glColor3f(0.0f, 1.0f,0.0f); //GREEN
glVertex3f(0.0f, -0.333f,0.798f); //A
glColor3f(1.0f, 0.0f,0.0f); //RED
glVertex3f(1.0f, -1.0f,-0.798f); //D
glEnd();
}
//Draw Loop
- (void) drawRect: (NSRect) bounds
{
//Clear the screen and depth buffer
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
//Reset the current modelview matrix
glLoadIdentity();
//Move along the x and z axis
glTranslatef( -1.0f, 0.0f, -5.0f );
//rotate the modelview matrix by an angle of rotTri around the vector <1,>
glRotatef( rotTri,1.0f, 1.0f, 1.0f );
//Draw a pyramid to the buffers
drawAnObject();
//Reset Modelview
glLoadIdentity();
glTranslatef( 1.2f, 0.5f, -5.0f );
glRotatef( -5.0f*rotTri,0.0f, 1.0f, 0.0f );
drawAnObject();
//Display the buffer content to the screen
[ [ self openGLContext ] flushBuffer ];
}
