From 9e950c695943223e76b0b97e78b18a1f5f6da1dc Mon Sep 17 00:00:00 2001
From: Patrick Ferry <8967997+PatrickFerry@users.noreply.github.com>
Date: Thu, 28 Sep 2023 03:00:04 +0100
Subject: [PATCH] Use Vertex Depth Range when zRange Exceeds farZ

When the inverted depth range is unsupported and zRange is greater than farZ then min_depth becomes a negative value and far_depth will then exceed a depth of 1.0 (which is outside the scope of most backends and greater than GX_MAX_DEPTH of the console).

This happens when the backend supports depth clamping the min_depth is not clamped to zero.
---
 Source/Core/VideoCommon/VertexShaderManager.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Source/Core/VideoCommon/VertexShaderManager.cpp b/Source/Core/VideoCommon/VertexShaderManager.cpp
index 41c06ad4ba..ce5ebdbb00 100644
--- a/Source/Core/VideoCommon/VertexShaderManager.cpp
+++ b/Source/Core/VideoCommon/VertexShaderManager.cpp
@@ -168,8 +168,14 @@ bool VertexShaderManager::UseVertexDepthRange()
     return true;
 
   // If an inverted depth range is unsupported, we also need to check if the range is inverted.
-  if (!g_ActiveConfig.backend_info.bSupportsReversedDepthRange && xfmem.viewport.zRange < 0.0f)
-    return true;
+  if (!g_ActiveConfig.backend_info.bSupportsReversedDepthRange)
+  {
+    if (xfmem.viewport.zRange < 0.0f)
+      return true;
+
+    if (xfmem.viewport.zRange > xfmem.viewport.farZ)
+      return true;
+  }
 
   // If an oversized depth range or a ztexture is used, we need to calculate the depth range
   // in the vertex shader.