Initial commit.

.gitattributes

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+*.pbxproj -crlf -diff -merge

.gitignore

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+# xcode noise
+build/*
+*.pbxuser
+*.mode1v3
+
+# osx noise
+.DS_Store
+profile

.gitignore~

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+# xcode noise
+build/*
+*.pbxuser
+*.mode1v3
+
+# osx noise
+.DS_Store
+profile

Final/Classes/EAGLView.h

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+//
+//  EAGLView.h
+//  Final
+//
+//  Created by David Nolen on 10/18/09.
+//  Copyright David Nolen 2009. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import <QuartzCore/QuartzCore.h>
+
+#import "ESRenderer.h"
+
+// This class wraps the CAEAGLLayer from CoreAnimation into a convenient UIView subclass.
+// The view content is basically an EAGL surface you render your OpenGL scene into.
+// Note that setting the view non-opaque will only work if the EAGL surface has an alpha channel.
+@interface EAGLView : UIView
+{    
+@private
+	id <ESRenderer> renderer;
+
+	BOOL animating;
+	BOOL displayLinkSupported;
+	NSInteger animationFrameInterval;
+	// Use of the CADisplayLink class is the preferred method for controlling your animation timing.
+	// CADisplayLink will link to the main display and fire every vsync when added to a given run-loop.
+	// The NSTimer class is used only as fallback when running on a pre 3.1 device where CADisplayLink
+	// isn't available.
+	id displayLink;
+    NSTimer *animationTimer;
+}
+
+@property (readonly, nonatomic, getter=isAnimating) BOOL animating;
+@property (nonatomic) NSInteger animationFrameInterval;
+
+- (void) startAnimation;
+- (void) stopAnimation;
+- (void) drawView:(id)sender;
+
+@end

Final/Classes/EAGLView.m

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+//
+//  EAGLView.m
+//  Final
+//
+//  Created by David Nolen on 10/18/09.
+//  Copyright David Nolen 2009. All rights reserved.
+//
+
+#import "EAGLView.h"
+
+#import "ES1Renderer.h"
+#import "ES2Renderer.h"
+
+@implementation EAGLView
+
+@synthesize animating;
+@dynamic animationFrameInterval;
+
+// You must implement this method
++ (Class) layerClass
+{
+    return [CAEAGLLayer class];
+}
+
+//The GL view is stored in the nib file. When it's unarchived it's sent -initWithCoder:
+- (id) initWithCoder:(NSCoder*)coder
+{    
+    if ((self = [super initWithCoder:coder]))
+	{
+        // Get the layer
+        CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
+
+        eaglLayer.opaque = TRUE;
+        eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
+                                        [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];
+
+		renderer = [[ES2Renderer alloc] init];
+
+		if (!renderer)
+		{
+			renderer = [[ES1Renderer alloc] init];
+
+			if (!renderer)
+			{
+				[self release];
+				return nil;
+			}
+		}
+
+		animating = FALSE;
+		displayLinkSupported = FALSE;
+		animationFrameInterval = 1;
+		displayLink = nil;
+		animationTimer = nil;
+
+		// A system version of 3.1 or greater is required to use CADisplayLink. The NSTimer
+		// class is used as fallback when it isn't available.
+		NSString *reqSysVer = @"3.1";
+		NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
+		if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)
+			displayLinkSupported = TRUE;
+    }
+
+    return self;
+}
+
+- (void) drawView:(id)sender
+{
+    [renderer render];
+}
+
+- (void) layoutSubviews
+{
+	[renderer resizeFromLayer:(CAEAGLLayer*)self.layer];
+    [self drawView:nil];
+}
+
+- (NSInteger) animationFrameInterval
+{
+	return animationFrameInterval;
+}
+
+- (void) setAnimationFrameInterval:(NSInteger)frameInterval
+{
+	// Frame interval defines how many display frames must pass between each time the
+	// display link fires. The display link will only fire 30 times a second when the
+	// frame internal is two on a display that refreshes 60 times a second. The default
+	// frame interval setting of one will fire 60 times a second when the display refreshes
+	// at 60 times a second. A frame interval setting of less than one results in undefined
+	// behavior.
+	if (frameInterval >= 1)
+	{
+		animationFrameInterval = frameInterval;
+
+		if (animating)
+		{
+			[self stopAnimation];
+			[self startAnimation];
+		}
+	}
+}
+
+- (void) startAnimation
+{
+	if (!animating)
+	{
+		if (displayLinkSupported)
+		{
+			// CADisplayLink is API new to iPhone SDK 3.1. Compiling against earlier versions will result in a warning, but can be dismissed
+			// if the system version runtime check for CADisplayLink exists in -initWithCoder:. The runtime check ensures this code will
+			// not be called in system versions earlier than 3.1.
+
+			displayLink = [NSClassFromString(@"CADisplayLink") displayLinkWithTarget:self selector:@selector(drawView:)];
+			[displayLink setFrameInterval:animationFrameInterval];
+			[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
+		}
+		else
+			animationTimer = [NSTimer scheduledTimerWithTimeInterval:(NSTimeInterval)((1.0 / 60.0) * animationFrameInterval) target:self selector:@selector(drawView:) userInfo:nil repeats:TRUE];
+
+		animating = TRUE;
+	}
+}
+
+- (void)stopAnimation
+{
+	if (animating)
+	{
+		if (displayLinkSupported)
+		{
+			[displayLink invalidate];
+			displayLink = nil;
+		}
+		else
+		{
+			[animationTimer invalidate];
+			animationTimer = nil;
+		}
+
+		animating = FALSE;
+	}
+}
+
+- (void) dealloc
+{
+    [renderer release];
+
+    [super dealloc];
+}
+
+@end

Final/Classes/ES1Renderer.h

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+//
+//  ES1Renderer.h
+//  Final
+//
+//  Created by David Nolen on 10/18/09.
+//  Copyright David Nolen 2009. All rights reserved.
+//
+
+#import "ESRenderer.h"
+
+#import <OpenGLES/ES1/gl.h>
+#import <OpenGLES/ES1/glext.h>
+
+@interface ES1Renderer : NSObject <ESRenderer>
+{
+@private
+	EAGLContext *context;
+
+	// The pixel dimensions of the CAEAGLLayer
+	GLint backingWidth;
+	GLint backingHeight;
+
+	// The OpenGL names for the framebuffer and renderbuffer used to render to this view
+	GLuint defaultFramebuffer, colorRenderbuffer;
+}
+
+- (void) render;
+- (BOOL) resizeFromLayer:(CAEAGLLayer *)layer;
+
+@end

Final/Classes/ES1Renderer.m

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+//
+//  ES1Renderer.m
+//  Final
+//
+//  Created by David Nolen on 10/18/09.
+//  Copyright David Nolen 2009. All rights reserved.
+//
+
+#import "ES1Renderer.h"
+
+@implementation ES1Renderer
+
+// Create an ES 1.1 context
+- (id) init
+{
+	if (self = [super init])
+	{
+		context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
+
+        if (!context || ![EAGLContext setCurrentContext:context])
+		{
+            [self release];
+            return nil;
+        }
+
+		// Create default framebuffer object. The backing will be allocated for the current layer in -resizeFromLayer
+		glGenFramebuffersOES(1, &defaultFramebuffer);
+		glGenRenderbuffersOES(1, &colorRenderbuffer);
+		glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer);
+		glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
+		glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, colorRenderbuffer);
+	}
+
+	return self;
+}
+
+- (void) render
+{
+    // Replace the implementation of this method to do your own custom drawing
+
+    static const GLfloat squareVertices[] = {
+        -0.5f,  -0.33f,
+         0.5f,  -0.33f,
+        -0.5f,   0.33f,
+         0.5f,   0.33f,
+    };
+
+    static const GLubyte squareColors[] = {
+        255, 255,   0, 255,
+        0,   255, 255, 255,
+        0,     0,   0,   0,
+        255,   0, 255, 255,
+    };
+
+	static float transY = 0.0f;
+
+	// This application only creates a single context which is already set current at this point.
+	// This call is redundant, but needed if dealing with multiple contexts.
+    [EAGLContext setCurrentContext:context];
+
+	// This application only creates a single default framebuffer which is already bound at this point.
+	// This call is redundant, but needed if dealing with multiple framebuffers.
+    glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer);
+    glViewport(0, 0, backingWidth, backingHeight);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+    glTranslatef(0.0f, (GLfloat)(sinf(transY)/2.0f), 0.0f);
+	transY += 0.075f;
+
+    glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    glVertexPointer(2, GL_FLOAT, 0, squareVertices);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors);
+    glEnableClientState(GL_COLOR_ARRAY);
+
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+	// This application only creates a single color renderbuffer which is already bound at this point.
+	// This call is redundant, but needed if dealing with multiple renderbuffers.
+    glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
+    [context presentRenderbuffer:GL_RENDERBUFFER_OES];
+}
+
+- (BOOL) resizeFromLayer:(CAEAGLLayer *)layer
+{	
+	// Allocate color buffer backing based on the current layer size
+    glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
+    [context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:layer];
+	glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
+    glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
+
+    if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES)
+	{
+		NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
+        return NO;
+    }
+
+    return YES;
+}
+
+- (void) dealloc
+{
+	// Tear down GL
+	if (defaultFramebuffer)
+	{
+		glDeleteFramebuffersOES(1, &defaultFramebuffer);
+		defaultFramebuffer = 0;
+	}
+
+	if (colorRenderbuffer)
+	{
+		glDeleteRenderbuffersOES(1, &colorRenderbuffer);
+		colorRenderbuffer = 0;
+	}
+
+	// Tear down context
+	if ([EAGLContext currentContext] == context)
+        [EAGLContext setCurrentContext:nil];
+
+	[context release];
+	context = nil;
+
+	[super dealloc];
+}
+
+@end