So I've setup CVPixelBuffer's and tied them to OpenGL FBOs successfully on iOS. But now trying to do the same on OSX has me snagged.
The textures from CVOpenGLTextureCacheCreateTextureFromImage return as GL_TEXTURE_RECTANGLE instead of GL_TEXTURE_2D targets.
I've found the kCVOpenGLBufferTarget key, but it seems like it is supposed to be used with CVOpenGLBufferCreate not CVPixelBufferCreate.
Is it even possible to get GL_TEXTURE_2D targeted textures on OSX with CVPixelBufferCreate, and if so how?
FWIW a listing of the CV PBO setup:
NSDictionary *bufferAttributes = @{ (__bridge NSString *)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_32BGRA), (__bridge NSString *)kCVPixelBufferWidthKey : @(size.width), (__bridge NSString *)kCVPixelBufferHeightKey : @(size.height), (__bridge NSString *)kCVPixelBufferIOSurfacePropertiesKey : @{ } };
if (pool)
{
error = CVPixelBufferPoolCreatePixelBuffer(kCFAllocatorDefault, pool, &renderTarget);
}
else
{
error = CVPixelBufferCreate(kCFAllocatorDefault, (NSUInteger)size.width, (NSUInteger)size.height, kCVPixelFormatType_32BGRA, (__bridge CFDictionaryRef)bufferAttributes, &renderTarget);
}
ZAssert(!error, @"Couldn't create pixel buffer");
error = CVOpenGLTextureCacheCreate(kCFAllocatorDefault, NULL, [[NSOpenGLContext context] CGLContextObj], [[NSOpenGLContext format] CGLPixelFormatObj], NULL, &textureCache);
ZAssert(!error, @"Could not create texture cache.");
error = CVOpenGLTextureCacheCreateTextureFromImage(kCFAllocatorDefault, textureCache, renderTarget, NULL, &renderTexture);
ZAssert(!error, @"Couldn't create a texture from cache.");
GLuint reference = CVOpenGLTextureGetName(renderTexture);
GLenum target = CVOpenGLTextureGetTarget(renderTexture);
UPDATE: I've been able to successfully use the resulting GL_TEXTURE_RECTANGLE textures. However, this will cause a lot of problems with the shaders for compatibility between iOS and OSX. And anyway I'd rather continue to use normalised texture coordinates.
If it isn't possible to get GL_TEXTURE_2D textures directly from a CVPixelBuffer in this manner, would it be possible to create a CVOpenGLBuffer and have a CVPixelBuffer attached to it to pull the pixel data?