EXC_BAD_ACCESS when calling vuRenderControllerUpdateVideoBackgroundTexture - ios

Question

I receive a EXC_BAD_ACCESS (code=1, address = 0x0) when I call the function vuRenderControllerUpdateVideoBackgroundTexture in Vuforia 10.
None of the parameters I sent are NULL/nullptr though.
- (void)renderFrame {
if(![[self session]cameraIsStarted]) {
[[self view]setHidden:YES];
return;
}
[[self view]setHidden:NO];
CAMetalLayer* layer = (CAMetalLayer*) view.layer;
if(!_videoTexture) {
[self viewDidChangeSize:[layer drawableSize]];
}
id<CAMetalDrawable> drawable = [layer nextDrawable];
if(!drawable) {
return;
}
VuState* state = nullptr;
vuEngineAcquireLatestState([session engine], &state);
if(vuStateHasCameraFrame(state) == VU_FALSE) {
vuStateRelease(state);
return;
}
id<MTLCommandBuffer> commandBuffer = [[self commandQueue] commandBuffer];
MTLRenderPassDescriptor* backgroundPassDescriptor = [[MTLRenderPassDescriptor alloc] init];
MTLRenderPassColorAttachmentDescriptor* colorAttachment = [backgroundPassDescriptor colorAttachments][0];
[colorAttachment setTexture:[drawable texture]];
[colorAttachment setLoadAction:MTLLoadActionClear];
[colorAttachment setClearColor:MTLClearColorMake(0.0,0.0,0.0,1.0)];
[colorAttachment setStoreAction:MTLStoreActionStore];
[[backgroundPassDescriptor depthAttachment] setTexture:[self videoDepthTexture]];
[[backgroundPassDescriptor depthAttachment]setLoadAction:MTLLoadActionClear];
[[backgroundPassDescriptor depthAttachment]setStoreAction:MTLStoreActionStore];
[[backgroundPassDescriptor depthAttachment]setClearDepth:0.0f];
id<MTLRenderCommandEncoder> backgroundEncoder = [commandBuffer renderCommandEncoderWithDescriptor:backgroundPassDescriptor];
int textureUnitData = 0;
VuRenderVideoBackgroundData backgroundData;
backgroundData.renderData = &backgroundEncoder;
backgroundData.textureUnitData = &textureUnitData;
backgroundData.textureData = &_videoTexture;
VuResult result = vuRenderControllerUpdateVideoBackgroundTexture([session renderController], state, &backgroundData); // crash here
At the call site, the variables are like this:
Am I missing an undocumented precondition?

Answer 1

I am not familiar with Vuforia so I'm not sure if this will help.
The OxO is indeed likely to be a NULL pointer deference.
I dont see the contents of state on your image. Did you make sure state is not NULL anymore?
Else maybe check if there are methods to instantiate VuState and VuRenderVideoBackgroundData objects. Sometimes only declaring can be not enough.