NSOpenGLView without Interface Builder - objective-c

Question

I've written a class TestingView which is a subclass of NSOpenGLView, and added it to NSWindow through Interface Builder
#implementation TestingView
- (void)prepareOpenGL
{
[super prepareOpenGL];
glGenRenderbuffers( NumRenderbuffers, renderbuffer );
glBindRenderbuffer( GL_RENDERBUFFER, renderbuffer[Color] );
glRenderbufferStorage( GL_RENDERBUFFER, GL_RGBA, 1024, 768 );
glBindRenderbuffer( GL_RENDERBUFFER, renderbuffer[Depth] );
glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 1024, 768);
glGenFramebuffers( 1, &framebuffer );
glBindFramebuffer( GL_DRAW_FRAMEBUFFER, framebuffer );
glFramebufferRenderbuffer( GL_DRAW_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
renderbuffer[Color] );
glFramebufferRenderbuffer( GL_DRAW_FRAMEBUFFER,
GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, renderbuffer[Depth] );
glEnable( GL_DEPTH_TEST );
}
- (void)show
{
glBindFramebuffer( GL_READ_FRAMEBUFFER, framebuffer );
glBindFramebuffer( GL_DRAW_FRAMEBUFFER, 0 );
glViewport(0, 0, self.window.frame.size.width, self.window.frame.size.height);
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glBlitFramebuffer( 0, 0, 1024, 768, 0, 0, 1024, 768, GL_COLOR_BUFFER_BIT, GL_NEAREST );
glSwapAPPLE();
}
- (void)draw
{
/* Prepare to render into the renderbuffer */
glBindFramebuffer( GL_DRAW_FRAMEBUFFER, framebuffer );
glViewport( 0, 0, 1024, 768 );
/* Render into renderbuffer */
glClearColor( 1.0, 1.0, 0.0, 1.0 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
}
#end
and it works fine. However in my second project I can not use Interface Builder, so I do it like this,
TestingView *testingView = [[TestingView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
[self.view addSubview:testingView];
and it doesn't work. OpengGLContext doesn't initialize properly. I also tried
GLuint pixAttribs[] =
{
NSOpenGLPFAWindow, // choose among pixelformats capable of rendering to windows
NSOpenGLPFAAccelerated, // require hardware-accelerated pixelformat
NSOpenGLPFADoubleBuffer, // require double-buffered pixelformat
NSOpenGLPFAColorSize, 24, // require 24 bits for color-channels
NSOpenGLPFAAlphaSize, 8, // require an 8-bit alpha channel
NSOpenGLPFADepthSize, 24, // require a 24-bit depth buffer
NSOpenGLPFAMinimumPolicy, // select a pixelformat which meets or exceeds these requirements
0
};
NSOpenGLPixelFormat *pixFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:pixAttribs];
NSOpenGLContext *context = [[NSOpenGLContext alloc] initWithFormat:pixFormat shareContext:nil];
TestingView *testingView = [[TestingView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768) pixelFormat:pixFormat];
testingView.openGLContext = context;
and OpenGL still doesn't work. How can I add NSOpenGLView as a subview without using Interface Builder?

Answer 1

I smashed my head a few times on that one. I found out that my pixformat was in the way. Here's what I'd do:
// Assuming you have a self.window initialized somewhere
TestingView *testingView = [[TestingView alloc] initWithFrame:self.window.frame pixelFormat:nil];
[self.window setContentView:testingView];
You can checkout my full implementation (no Interface Builder at all) here: https://gitorious.org/glengine/glengine