Support mesh output from different view indices on vulkan

* When using VK_KHR_multiview you can select which view to view the mesh data from.

renderdoc/api/replay/control_types.h

@@ -134,6 +134,8 @@ struct MeshDisplay
   bool showWholePass;
   DOCUMENT("The index of the currently selected instance in the drawcall.");
   uint32_t curInstance;
+  DOCUMENT("The index of the currently selected multiview view in the drawcall.");
+  uint32_t curView;
 
   DOCUMENT("The index of the vertex to highlight, or :data:`NoHighlight` to select no vertex.");
   uint32_t highlightVert;

renderdoc/api/replay/pipestate.h

@@ -133,6 +133,9 @@ public:
     return false;
   }
 
+  DOCUMENT("Returns the number of views being broadcast to simultaneously during rendering.");
+  uint32_t MultiviewBroadcastCount() const;
+
   DOCUMENT(R"(Determines whether or not the current capture supports binding arrays of resources.
 
 :return: A boolean indicating if binding arrays of resources is supported.

renderdoc/api/replay/pipestate.inl

@@ -382,6 +382,16 @@ ResourceId PipeState::GetGraphicsPipelineObject() const
   return ResourceId();
 }
 
+uint32_t PipeState::MultiviewBroadcastCount() const
+{
+  if(IsCaptureLoaded() && IsCaptureVK())
+  {
+    return std::max((uint32_t)m_Vulkan->currentPass.renderpass.multiviews.size(), 1U);
+  }
+
+  return 1;
+}
+
 rdcstr PipeState::GetShaderEntryPoint(ShaderStage stage) const
 {
   if(IsCaptureLoaded() && IsCaptureVK())

renderdoc/api/replay/renderdoc_replay.h

@@ -1124,12 +1124,13 @@ texture to something compatible with the target file format.
 
   DOCUMENT(R"(Retrieve the generated data from one of the geometry processing shader stages.
 
-:param int instance: The index of the instance to retrieve data for.
+:param int instance: The index of the instance to retrieve data for, or 0 for non-instanced draws.
+:param int view: The index of the multiview view to retrieve data for, or 0 if multiview is disabled.
 :param MeshDataStage stage: The stage of the geometry processing pipeline to retrieve data from.
 :return: The information describing where the post-transform data is stored.
 :rtype: MeshFormat
 )");
-  virtual MeshFormat GetPostVSData(uint32_t instance, MeshDataStage stage) = 0;
+  virtual MeshFormat GetPostVSData(uint32_t instance, uint32_t view, MeshDataStage stage) = 0;
 
   DOCUMENT(R"(Retrieve the contents of a range of a buffer as a ``bytes``.
 

renderdoc/api/replay/vk_pipestate.h

@@ -573,6 +573,13 @@ struct RenderPass
 If there is no depth-stencil attachment, this index is ``-1``.
 )");
   int32_t depthstencilAttachment = -1;
+
+  DOCUMENT(R"(If multiview is enabled, contains a list of view indices to be broadcast to during
+rendering.
+
+If the list is empty, multiview is disabled and rendering is as normal.
+)");
+  rdcarray<uint32_t> multiviews;
 };
 
 DOCUMENT("Describes a single attachment in a framebuffer object.");