GS/DX11: Fix uav null_texture usage.

We shouldn't use Feedback alone here as it would cause issues and trigger ValidateUsageAndFormat assert, use FeedbackTarget as that's the next best without uav.

bin/resources/shaders/vulkan/tfx.glsl

@@ -587,7 +587,7 @@ void main()
 
 #define PS_FEEDBACK_LOOP_IS_NEEDED_RT (PS_TEX_IS_FB == 1 || AFAIL_NEEDS_RT || PS_FBMASK || SW_BLEND_NEEDS_RT || SW_AD_TO_HW || (PS_DATE >= 5))
 #define PS_FEEDBACK_LOOP_IS_NEEDED_DEPTH (AFAIL_NEEDS_DEPTH || ZTST_NEEDS_DEPTH || AA1_NEEDS_DEPTH)
-#define ZWRITE (PS_ZCLAMP || PS_ZFLOOR || SW_DEPTH || PS_FEEDBACK_LOOP_IS_NEEDED_DEPTH)
+#define ZWRITE (PS_ZCLAMP || PS_ZFLOOR || PS_FEEDBACK_LOOP_IS_NEEDED_DEPTH)
 
 #define PS_RETURN_COLOR_ROV (!PS_NO_COLOR && PS_ROV_COLOR)
 #define PS_RETURN_COLOR (!PS_NO_COLOR && !PS_ROV_COLOR)

pcsx2/GS/Renderers/DX11/GSDevice11.cpp

@@ -603,7 +603,7 @@ bool GSDevice11::Create(GSVSyncMode vsync_mode, bool allow_present_throttle)
 	}
 
 	// 1x1 dummy texture.
-	const GSTexture::Usage null_usage = m_uav_texture ? GSTexture::ShaderWriteTarget : GSTexture::Feedback;
+	const GSTexture::Usage null_usage = m_uav_texture ? GSTexture::ShaderWriteTarget : GSTexture::FeedbackTarget;
 	m_null_texture = CreateSurface(null_usage, 1, 1, 1, GSTexture::Format::Color);
 	if (!m_null_texture)
 		return false;

pcsx2/GS/Renderers/Vulkan/GSDeviceVK.cpp

@@ -5418,6 +5418,17 @@ void GSDeviceVK::PSSetROVs(GSTexture* rt, GSTexture* ds, bool write_rt, bool wri
 		PSSetShaderResource(TFX_TEXTURE_DEPTH_ROV, nullptr, false);
 	}
 
+	if (IsDeviceNVIDIA() && InRenderPass())
+	{
+		// Nvidia doesn't like switching ROV targets mid-render pass, doing so causes flickering or missing geometry.
+		// End the render pass to avoid such issues.
+		if (vkRt != oldVkRt || vkDs != oldVkDs)
+		{
+			GL_INS("VK: Ending render pass due to UAV switch");
+			EndRenderPass();
+		}
+	}
+
 	if (GSConfig.HWROVBarriersVK)
 	{
 		// This is to fix issues with some systems that seem to require barriers even with FSI.

pcsx2/ShaderCacheVersion.h

@@ -3,4 +3,4 @@
 
 /// Version number for GS and other shaders. Increment whenever any of the contents of the
 /// shaders change, to invalidate the cache.
-static constexpr u32 SHADER_CACHE_VERSION = 108; // Last changed in PR 14688
+static constexpr u32 SHADER_CACHE_VERSION = 109; // Last changed in PR 14795