あなたが見ている例では、2D GL用のデプスバッファとパースペクティブマトリックスがありません。代わりにaurioTouchの例を見てください。 EAGLViewクラスでは、深度バッファを実装するオプションがあります。 2つの組み合わせ（aurioTouchはシェーダを実装していないので）より良い理解が得られるはずです
私はあなたのメソッドでの操作の順序が問題を引き起こしていると思います。ここ は、私は私のアプリ形状にGLテクスチャとしてライブカメラを置き、「ライブエフェクトライブチャット」で使用したコードです：
#define DEGREES_TO_RADIANS(__ANGLE__) ((__ANGLE__)/180.0 * M_PI)
@interface GLView : UIView
{
@private
/* The pixel dimensions of the backbuffer */
GLint backingWidth;
GLint backingHeight;
EAGLContext *context;
/* OpenGL names for the renderbuffer and framebuffers used to render to this view */
GLuint viewRenderbuffer;
GLuint viewFramebuffer;
GLuint depthRenderbuffer;
/* OpenGL name for the sprite texture */
GLuint spriteTexture;
}
@property (readonly) GLint backingWidth;
@property (readonly) GLint backingHeight;
@property (readonly) EAGLContext *context;
- (void) drawView;
- (BOOL) createFramebuffer;
- (void) destroyFramebuffer;
+ (UIImage *) snapshot:(GLView *)eaglview;
@end
@implementation GLView
@synthesize backingWidth;
@synthesize backingHeight;
@synthesize context;
+ (Class) layerClass
{
return [CAEAGLLayer class];
}
- (id)init
{
self = [[super init] initWithFrame:CGRectMake(0.0, 0.0, 480.0, 640.0)]; // size of the camera image being captures
if (self==nil)
return self;
// Set Content Scaling
//
if (HIRESDEVICE)
{
self.contentScaleFactor = (CGFloat)2.0;
}
// Get our backing layer
//
CAEAGLLayer *eaglLayer = (CAEAGLLayer*) self.layer;
// Configure it so that it is opaque, does not retain the contents of the backbuffer when displayed, and uses RGBA8888 color.
//
eaglLayer.opaque = YES;
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking,
kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat,
nil];
// Create our EAGLContext, and if successful make it current and create our framebuffer.
//
context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
if(!context || ![EAGLContext setCurrentContext:context] || ![self createFramebuffer])
{
[self release];
return nil;
}
// Final View Settings
//
[self setOpaque:YES];
self.multipleTouchEnabled = YES;
self.backgroundColor = [UIColor clearColor];
[EAGLContext setCurrentContext:context];
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
GLfloat zNear = 1.0;
GLfloat zFar = 1000.0;
GLfloat fieldOfView = 90; // Lens Angle of View
GLfloat size = zNear * tanf(DEGREES_TO_RADIANS(fieldOfView)/2.0);
CGRect rect = CGRectMake((CGFloat)0.0, (CGFloat)0.0, backingWidth, backingHeight);
glFrustumf(-size, size, -size/(rect.size.width/rect.size.height), size/(rect.size.width/rect.size.height), zNear, zFar);
glViewport(0, 0, backingWidth, backingHeight);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glEnable(GL_MULTISAMPLE);
glEnable(GL_LINE_SMOOTH);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
glDisable(GL_ALPHA_TEST);
// Turn Translucent Textures: OFF
//
glDisable(GL_BLEND);
// // Turn Translucent Textures: ON
// //
// glEnable(GL_BLEND);
// glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
return self;
}
- (void) drawView
{
[context presentRenderbuffer:GL_RENDERBUFFER_OES];
}
- (BOOL)createFramebuffer
{
// Generate IDs for a framebuffer object and a color renderbuffer
//
glGenFramebuffersOES(1, &viewFramebuffer);
glGenRenderbuffersOES(1, &viewRenderbuffer);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
// This call associates the storage for the current render buffer with the EAGLDrawable (our CAEAGLLayer)
// allowing us to draw into a buffer that will later be rendered to screen whereever the layer is (which corresponds with our view).
//
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
// If this app uses a depth buffer, we'll create and attach one via another renderbuffer.
//
if (YES)
{
glGenRenderbuffersOES(1, &depthRenderbuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, backingWidth, backingHeight);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
}
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) destroyFramebuffer
{
glDeleteFramebuffersOES(1, &viewFramebuffer);
viewFramebuffer = 0;
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
viewRenderbuffer = 0;
if(depthRenderbuffer)
{
glDeleteRenderbuffersOES(1, &depthRenderbuffer);
depthRenderbuffer = 0;
}
}
+ (UIImage *) snapshot:(GLView *)eaglview
{
NSInteger x = 0;
NSInteger y = 0;
NSInteger width = [eaglview backingWidth];
NSInteger height = [eaglview backingHeight];
NSInteger dataLength = width * height * 4;
// Need to do this to get it to flush before taking the snapshit
//
NSUInteger i;
for (i=0; i<100; i++)
{
glFlush();
CFRunLoopRunInMode(kCFRunLoopDefaultMode, (float)1.0/(float)60.0, FALSE);
}
GLubyte *data = (GLubyte*)malloc(dataLength * sizeof(GLubyte));
// Read pixel data from the framebuffer
//
glPixelStorei(GL_PACK_ALIGNMENT, 4);
glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data);
// Create a CGImage with the pixel data
// If your OpenGL ES content is opaque, use kCGImageAlphaNoneSkipLast to ignore the alpha channel
// otherwise, use kCGImageAlphaPremultipliedLast
//
CGDataProviderRef ref = CGDataProviderCreateWithData(NULL, data, dataLength, NULL);
CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB();
CGImageRef iref = CGImageCreate(width, height, 8, 32, width * 4, colorspace, kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast, ref, NULL, true, kCGRenderingIntentDefault);
// OpenGL ES measures data in PIXELS
// Create a graphics context with the target size measured in POINTS
//
NSInteger widthInPoints;
NSInteger heightInPoints;
if (NULL != UIGraphicsBeginImageContextWithOptions)
{
// On iOS 4 and later, use UIGraphicsBeginImageContextWithOptions to take the scale into consideration
// Set the scale parameter to your OpenGL ES view's contentScaleFactor
// so that you get a high-resolution snapshot when its value is greater than 1.0
//
CGFloat scale = eaglview.contentScaleFactor;
widthInPoints = width/scale;
heightInPoints = height/scale;
UIGraphicsBeginImageContextWithOptions(CGSizeMake(widthInPoints, heightInPoints), NO, scale);
}
else
{
// On iOS prior to 4, fall back to use UIGraphicsBeginImageContext
//
widthInPoints = width;
heightInPoints = height;
UIGraphicsBeginImageContext(CGSizeMake(widthInPoints, heightInPoints));
}
CGContextRef cgcontext = UIGraphicsGetCurrentContext();
// UIKit coordinate system is upside down to GL/Quartz coordinate system
// Flip the CGImage by rendering it to the flipped bitmap context
// The size of the destination area is measured in POINTS
//
CGContextSetBlendMode(cgcontext, kCGBlendModeCopy);
CGContextDrawImage(cgcontext, CGRectMake(0.0, 0.0, widthInPoints, heightInPoints), iref);
// Retrieve the UIImage from the current context
UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); // autoreleased image
UIGraphicsEndImageContext();
// Clean up
free(data);
CFRelease(ref);
CFRelease(colorspace);
CGImageRelease(iref);
return image;
}
@end
これを拡張すると、ほぼ確実にES 1.xに固執したいと考えています。これは古典的なOpenGLマトリックススタックを保持しており、この種の作業を非常に簡単に実行できます。 ES 2.xでは、すべてのステージが非常にオープンな状態になっているため、3D計算をもっと大規模に処理する必要があります。 – Tommy
@up - 何が問題なのですか？より多くのコード、はい、しかしより多くのコントロール。 OpenGLのような低レベルのAPIで3Dグラフィックスをプログラミングするには、プログラム可能なパイプラインの時代に「たくさんの3D数学」を意味するはずです...現代のものを知ることができたら、古い技術を学ぶことを強くお勧めします。 – Kos
@ Kos、それはまさに私の考えです。私たちは前進しますが、後ろ向きではありません... – lm2s