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    <p>I had a very similar problem - to render some lines and get UIImage. I used OpenGL ES 1.1 and multisampling. I removed some additional code that does not refers to rendering and some OpenGL error checks. You can find the full code here: <a href="https://github.com/medvedNick/Mapsforge_iOS/blob/master/OpenStreetPad/OpenStreetPad/OSPRendererGL.m">OSPRendererGL</a>. Also, sorry for my one-for-all method.</p> <pre><code>@interface OSPRendererGL { EAGLContext* myContext; GLuint framebuffer; GLuint colorRenderbuffer; GLuint depthRenderbuffer; GLuint _vertexArray; GLuint _vertexBuffer; GLuint resolveFramebuffer; GLuint msaaFramebuffer, msaaRenderbuffer, msaaDepthbuffer; int width; int height; } @implementation OSPRendererGL - (id) init { self = [super init]; if (self) { myContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1]; [EAGLContext setCurrentContext:myContext]; [self setupOpenGL]; [EAGLContext setCurrentContext:nil]; width = 256; height = 256; } return self; } -(void) setupOpenGL { glGenFramebuffersOES(1, &amp;framebuffer); glBindFramebufferOES(GL_FRAMEBUFFER_OES, framebuffer); glGenRenderbuffersOES(1, &amp;colorRenderbuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer); glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_RGBA8_OES, width, height); glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, colorRenderbuffer); glGenRenderbuffersOES(1, &amp;depthRenderbuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer); glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, width, height); glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer); glGenFramebuffersOES(1, &amp;msaaFramebuffer); glGenRenderbuffersOES(1, &amp;msaaRenderbuffer); glBindFramebufferOES(GL_FRAMEBUFFER_OES, msaaFramebuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, msaaRenderbuffer); glRenderbufferStorageMultisampleAPPLE(GL_RENDERBUFFER_OES, 4, GL_RGBA8_OES, width, height); glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, msaaRenderbuffer); glGenRenderbuffersOES(1, &amp;msaaDepthbuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, msaaDepthbuffer); glRenderbufferStorageMultisampleAPPLE(GL_RENDERBUFFER_OES, 4, GL_DEPTH_COMPONENT16_OES, width, height); glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, msaaDepthbuffer); } -(UIImage *) renderImageAtZoom:(int)zoom { CGRect b = CGRectMake(0, 0, width, height); OSPCoordinateRect r = OSPRectForMapAreaInRect([self mapArea], b); double_scale = b.size.width / r.size.x; double scale = 1.0/_scale; [EAGLContext setCurrentContext:myContext]; glBindFramebuffer(GL_FRAMEBUFFER_OES, msaaFramebuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, msaaRenderbuffer); glViewport(0, 0, width, height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrthof(0.0f, 256.0f, 256.0f, 0.0f, 1.0f, -1.0f); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glScalef(_scale, _scale, 1); glTranslatef(-r.origin.x, -r.origin.y, 0); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_LINE_SMOOTH); glEnable(GL_POINT_SMOOTH); glEnable(GL_BLEND); glClearColor(1, 1, 1, 1); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // rendering here glPopMatrix(); // msaa glBindFramebufferOES(GL_READ_FRAMEBUFFER_APPLE, msaaFramebuffer); glBindFramebufferOES(GL_DRAW_FRAMEBUFFER_APPLE, framebuffer); glResolveMultisampleFramebufferAPPLE(); glBindFramebuffer(GL_FRAMEBUFFER_OES, framebuffer); glBindRenderbufferOES(GL_RENDERBUFFER, colorRenderbuffer); // grabbing image from FBO GLint backingWidth, backingHeight; glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &amp;backingWidth); glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &amp;backingHeight); NSInteger x = 0, y = 0; NSInteger dataLength = width * height * 4; GLubyte *data = (GLubyte*)malloc(dataLength * sizeof(GLubyte)); glPixelStorei(GL_PACK_ALIGNMENT, 4); glReadPixels(x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data); 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); UIGraphicsBeginImageContext(CGSizeMake(width, height)); CGContextRef cgcontext = UIGraphicsGetCurrentContext(); CGContextSetBlendMode(cgcontext, kCGBlendModeCopy); CGContextDrawImage(cgcontext, CGRectMake(0.0, 0.0, width, height), iref); UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); free(data); CFRelease(ref); CFRelease(colorspace); CGImageRelease(iref); [EAGLContext setCurrentContext:nil]; return image; } </code></pre>
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