{maxwell_3d,buffer_cache}: Implement memory barriers using 3D registers

Drop MemoryBarrier from the buffer cache and use Maxwell3D's register
WaitForIdle.

To implement this on OpenGL we just call glMemoryBarrier with the
necessary bits.

Vulkan lacks this synchronization primitive, so we set an event and
immediately wait for it. This is not a pretty solution, but it's what
Vulkan can do without submitting the current command buffer to the queue
(which ends up being more expensive on the CPU).

1 files changed, 10 insertions, 0 deletions

diff --git a/src/video_core/renderer_vulkan/wrapper.h b/src/video_core/renderer_vulkan/wrapper.h
index bda16a2cb..98937a77a 100644
--- a/src/video_core/renderer_vulkan/wrapper.h
+++ b/src/video_core/renderer_vulkan/wrapper.h
@@ -205,6 +205,7 @@ struct DeviceDispatch : public InstanceDispatch {
     PFN_vkCmdSetStencilReference vkCmdSetStencilReference;
     PFN_vkCmdSetStencilWriteMask vkCmdSetStencilWriteMask;
     PFN_vkCmdSetViewport vkCmdSetViewport;
+    PFN_vkCmdWaitEvents vkCmdWaitEvents;
     PFN_vkCreateBuffer vkCreateBuffer;
     PFN_vkCreateBufferView vkCreateBufferView;
     PFN_vkCreateCommandPool vkCreateCommandPool;
@@ -958,6 +959,15 @@ public:
         dld->vkCmdSetEvent(handle, event, stage_flags);
     }
 
+    void WaitEvents(Span<VkEvent> events, VkPipelineStageFlags src_stage_mask,
+                    VkPipelineStageFlags dst_stage_mask, Span<VkMemoryBarrier> memory_barriers,
+                    Span<VkBufferMemoryBarrier> buffer_barriers,
+                    Span<VkImageMemoryBarrier> image_barriers) const noexcept {
+        dld->vkCmdWaitEvents(handle, events.size(), events.data(), src_stage_mask, dst_stage_mask,
+                             memory_barriers.size(), memory_barriers.data(), buffer_barriers.size(),
+                             buffer_barriers.data(), image_barriers.size(), image_barriers.data());
+    }
+
     void BindTransformFeedbackBuffersEXT(u32 first, u32 count, const VkBuffer* buffers,
                                          const VkDeviceSize* offsets,
                                          const VkDeviceSize* sizes) const noexcept {