Pooling GL_ELEMENT_ARRAY_BUFFERs

gistfile1.cpp

static vector<GLuint> elementArrayBufferPool;
static dispatch_semaphore_t elementArrayBufferPoolSemaphore;
static void __attribute__((constructor)) elementArrayBufferPoolInit(void)
{
	elementArrayBufferPoolSemaphore = dispatch_semaphore_create(1);
}

GLuint getUnusedElementArrayBufferFromPool(void)
{
	GLuint name = 0;

	dispatch_semaphore_wait(elementArrayBufferPoolSemaphore, DISPATCH_TIME_FOREVER);
	{
		if (elementArrayBufferPool.size())
		{
			name = elementArrayBufferPool.back();
			elementArrayBufferPool.pop_back();
		}
		else
		{
			CGLContextObj cgl_ctx = (CGLContextObj)getUnusedGLContext();
			glGenBuffers(1, &name);
			throwUnusedGLContextBackInPool(cgl_ctx);
		}
	}
	dispatch_semaphore_signal(elementArrayBufferPoolSemaphore);

	return name;
}

void throwElementArrayBufferBackInPool(GLuint name)
{
	dispatch_semaphore_wait(elementArrayBufferPoolSemaphore, DISPATCH_TIME_FOREVER);
	elementArrayBufferPool .push_back(name);
	dispatch_semaphore_signal(elementArrayBufferPoolSemaphore);
}