Make all sample_buffer() return Option

Author: kvark

src/acceleration_structure_pass.rs

@@ -72,7 +72,7 @@ impl AccelerationStructurePassSampleBufferAttachmentDescriptor {
 }
 
 impl AccelerationStructurePassSampleBufferAttachmentDescriptorRef {
-    pub fn sample_buffer(&self) -> &CounterSampleBufferRef {
+    pub fn sample_buffer(&self) -> Option<&CounterSampleBufferRef> {
         unsafe { msg_send![self, sampleBuffer] }
     }
 

src/blitpass.rs

@@ -66,7 +66,7 @@ impl BlitPassSampleBufferAttachmentDescriptor {
 }
 
 impl BlitPassSampleBufferAttachmentDescriptorRef {
-    pub fn sample_buffer(&self) -> &CounterSampleBufferRef {
+    pub fn sample_buffer(&self) -> Option<&CounterSampleBufferRef> {
         unsafe { msg_send![self, sampleBuffer] }
     }
 

src/computepass.rs

@@ -71,7 +71,7 @@ impl ComputePassSampleBufferAttachmentDescriptor {
 }
 
 impl ComputePassSampleBufferAttachmentDescriptorRef {
-    pub fn sample_buffer(&self) -> &CounterSampleBufferRef {
+    pub fn sample_buffer(&self) -> Option<&CounterSampleBufferRef> {
         unsafe { msg_send![self, sampleBuffer] }
     }
 

src/renderpass.rs

@@ -266,7 +266,7 @@ impl RenderPassSampleBufferAttachmentDescriptor {
 }
 
 impl RenderPassSampleBufferAttachmentDescriptorRef {
-    pub fn sample_buffer(&self) -> &CounterSampleBufferRef {
+    pub fn sample_buffer(&self) -> Option<&CounterSampleBufferRef> {
         unsafe { msg_send![self, sampleBuffer] }
     }