diff --git a/host/platform/Windows/capture/D12/backend.h b/host/platform/Windows/capture/D12/backend.h
index 5984d4b8..dbbd7025 100644
--- a/host/platform/Windows/capture/D12/backend.h
+++ b/host/platform/Windows/capture/D12/backend.h
@@ -29,6 +29,8 @@
 
 typedef struct D12Backend D12Backend;
 
+typedef struct D12FetchDesc D12FetchDesc;
+
 struct D12Backend
 {
   // friendly name
@@ -58,12 +60,15 @@ struct D12Backend
   CaptureResult (*sync)(D12Backend * instance,
     ID3D12CommandQueue * commandQueue);
 
-  ID3D12Resource * (*fetch)(
-    D12Backend      * instance,
-    unsigned          frameBufferIndex,
-    RECT           ** dirtyRects,
-    unsigned        * nbDirtyRects,
-    CaptureRotation * rotation);
+  ID3D12Resource * (*fetch)(D12Backend * instance, unsigned frameBufferIndex,
+    D12FetchDesc * meta);
+};
+
+struct D12FetchDesc
+{
+  CaptureRotation rotation;
+  RECT          * dirtyRects;
+  unsigned        nbDirtyRects;
 };
 
 static inline bool d12_backendCreate(const D12Backend * backend,
@@ -98,10 +103,8 @@ static inline CaptureResult d12_backendSync(D12Backend * instance,
   { return instance->sync(instance, commandQueue); }
 
 static inline ID3D12Resource * d12_backendFetch(D12Backend * instance,
-  unsigned frameBufferIndex, RECT ** dirtyRects, unsigned * nbDirtyRects,
-  CaptureRotation * rotation)
-  { return instance->fetch(instance, frameBufferIndex, dirtyRects,
-      nbDirtyRects, rotation); }
+  unsigned frameBufferIndex, D12FetchDesc * desc)
+  { return instance->fetch(instance, frameBufferIndex, desc); }
 
 // Backend defines
 
diff --git a/host/platform/Windows/capture/D12/backend/dd.c b/host/platform/Windows/capture/D12/backend/dd.c
index d7bb7026..2041b8f5 100644
--- a/host/platform/Windows/capture/D12/backend/dd.c
+++ b/host/platform/Windows/capture/D12/backend/dd.c
@@ -441,17 +441,16 @@ static CaptureResult d12_dd_sync(D12Backend * instance,
 }
 
 static ID3D12Resource * d12_dd_fetch(D12Backend * instance,
-  unsigned frameBufferIndex, RECT * dirtyRects[static D12_MAX_DIRTY_RECTS],
-  unsigned * nbDirtyRects, CaptureRotation * rotation)
+  unsigned frameBufferIndex, D12FetchDesc * desc)
 {
   DDInstance * this = UPCAST(DDInstance, instance);
 
   if (!this->current)
     return NULL;
 
-  *dirtyRects   = this->current->dirtyRects;
-  *nbDirtyRects = this->current->nbDirtyRects;
-  *rotation     = this->rotation;
+  desc->dirtyRects   = this->current->dirtyRects;
+  desc->nbDirtyRects = this->current->nbDirtyRects;
+  desc->rotation     = this->rotation;
 
   ID3D12Resource_AddRef(*this->current->d12Res);
   return *this->current->d12Res;
diff --git a/host/platform/Windows/capture/D12/d12.c b/host/platform/Windows/capture/D12/d12.c
index fde17ee5..348f53dd 100644
--- a/host/platform/Windows/capture/D12/d12.c
+++ b/host/platform/Windows/capture/D12/d12.c
@@ -428,13 +428,10 @@ static CaptureResult d12_waitFrame(unsigned frameBufferIndex,
   CaptureResult result = CAPTURE_RESULT_ERROR;
   comRef_scopePush(1);
 
-  RECT * dirtyRects;
-  unsigned nbDirtyRects;
-  CaptureRotation rotation;
+  D12FetchDesc desc;
 
   comRef_defineLocal(ID3D12Resource, src);
-  *src = d12_backendFetch(this->backend, frameBufferIndex,
-    &dirtyRects, &nbDirtyRects, &rotation);
+  *src = d12_backendFetch(this->backend, frameBufferIndex, &desc);
   if (!*src)
   {
     DEBUG_ERROR("D12 backend failed to produce an expected frame: %u",
@@ -504,13 +501,14 @@ static CaptureResult d12_waitFrame(unsigned frameBufferIndex,
     CAPTURE_FMT_BGR_32 : CAPTURE_FMT_BGRA;
   frame->hdr              = false;
   frame->hdrPQ            = false;
-  frame->rotation         = rotation;
+  frame->rotation         = desc.rotation;
 
   {
     // create a clean list of rects
-    FrameDamageRect allRects[nbDirtyRects];
+    FrameDamageRect allRects[desc.nbDirtyRects];
     unsigned count = 0;
-    for(const RECT * rect = dirtyRects; rect < dirtyRects + nbDirtyRects; ++rect)
+    for(const RECT * rect = desc.dirtyRects;
+      rect < desc.dirtyRects + desc.nbDirtyRects; ++rect)
       allRects[count++] = (FrameDamageRect){
         .x      = rect->left,
         .y      = rect->top,
@@ -544,13 +542,10 @@ static CaptureResult d12_getFrame(unsigned frameBufferIndex,
   CaptureResult result = CAPTURE_RESULT_ERROR;
   comRef_scopePush(3);
 
-  RECT * dirtyRects;
-  unsigned nbDirtyRects;
-  CaptureRotation rotation;
+  D12FetchDesc desc;
 
   comRef_defineLocal(ID3D12Resource, src);
-  *src = d12_backendFetch(this->backend, frameBufferIndex,
-    &dirtyRects, &nbDirtyRects, &rotation);
+  *src = d12_backendFetch(this->backend, frameBufferIndex, &desc);
   if (!*src)
   {
     DEBUG_ERROR("D12 backend failed to produce an expected frame: %u",
@@ -575,7 +570,7 @@ static CaptureResult d12_getFrame(unsigned frameBufferIndex,
   {
     next = d12_effectRun(
       this->effectRGB24, *this->device, *this->computeCommand.gfxList, next,
-      dirtyRects, &nbDirtyRects);
+      desc.dirtyRects, &desc.nbDirtyRects);
   }
 
   // copy into the framebuffer resource
@@ -605,7 +600,7 @@ static CaptureResult d12_getFrame(unsigned frameBufferIndex,
   };
 
   // if full frame damage
-  if (nbDirtyRects == 0)
+  if (desc.nbDirtyRects == 0)
   {
     this->nbDirtyRects = 0;
     ID3D12GraphicsCommandList_CopyTextureRegion(
@@ -622,7 +617,7 @@ static CaptureResult d12_getFrame(unsigned frameBufferIndex,
     }
     else
     {
-      FrameDamageRect allRects[this->nbDirtyRects + nbDirtyRects];
+      FrameDamageRect allRects[this->nbDirtyRects + desc.nbDirtyRects];
       unsigned count = 0;
 
       /* we must update the rects that were dirty in the prior frame also,
@@ -638,8 +633,8 @@ static CaptureResult d12_getFrame(unsigned frameBufferIndex,
         };
 
       /* add the new dirtyRects to the array */
-      for(const RECT * rect = dirtyRects;
-        rect < dirtyRects + nbDirtyRects; ++rect)
+      for(const RECT * rect = desc.dirtyRects;
+        rect < desc.dirtyRects + desc.nbDirtyRects; ++rect)
         allRects[count++] = (FrameDamageRect){
           .x      = rect->left,
           .y      = rect->top,
@@ -670,9 +665,9 @@ static CaptureResult d12_getFrame(unsigned frameBufferIndex,
     }
 
     /* store the dirty rects for the next frame */
-    memcpy(this->dirtyRects, dirtyRects,
-      nbDirtyRects * sizeof(*this->dirtyRects));
-    this->nbDirtyRects = nbDirtyRects;
+    memcpy(this->dirtyRects, desc.dirtyRects,
+      desc.nbDirtyRects * sizeof(*this->dirtyRects));
+    this->nbDirtyRects = desc.nbDirtyRects;
   }
 
   // execute the compute commands