Force Memory Barrier at VkRenderPass Start

We depend on past commands to have completed execution in a renderpass, a subpass dependency on all graphics stages from `VK_SUBPASS_EXTERNAL` to subpass #0 is used to enforce this. Nvidia and Adreno proprietary drivers implicitly do this but Turnip or Mali drivers require this or they execute out of order.

app/src/main/cpp/skyline/gpu/interconnect/command_nodes.cpp

@@ -4,6 +4,20 @@
 #include "command_nodes.h"
 
 namespace skyline::gpu::interconnect::node {
+    RenderPassNode::RenderPassNode(vk::Rect2D renderArea) : subpassDependencies(
+        {
+            // We assume all past commands have been executed when this RP starts
+            vk::SubpassDependency{
+                .srcSubpass = VK_SUBPASS_EXTERNAL,
+                .dstSubpass = 0,
+                .srcStageMask = vk::PipelineStageFlagBits::eAllGraphics,
+                .dstStageMask = vk::PipelineStageFlagBits::eAllGraphics,
+                .srcAccessMask = vk::AccessFlagBits::eMemoryRead | vk::AccessFlagBits::eMemoryWrite,
+                .dstAccessMask = vk::AccessFlagBits::eMemoryRead | vk::AccessFlagBits::eMemoryWrite,
+            }
+        }
+    ), storage(std::make_shared<Storage>()), renderArea(renderArea) {}
+
     RenderPassNode::Storage::~Storage() {
         if (device) {
             if (framebuffer)

app/src/main/cpp/skyline/gpu/interconnect/command_nodes.h

@@ -64,7 +64,7 @@ namespace skyline::gpu::interconnect::node {
         vk::Rect2D renderArea;
         std::vector<vk::ClearValue> clearValues;
 
-        RenderPassNode(vk::Rect2D renderArea) : storage(std::make_shared<Storage>()), renderArea(renderArea) {}
+        RenderPassNode(vk::Rect2D renderArea);
 
         /**
          * @note Any preservation of attachments from previous subpasses is automatically handled by this