From 9573c389de145bca2a676060070d99f040ae2d35 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Wed, 12 Feb 2025 13:00:25 +0100
Subject: [PATCH] [dxvk] Don't create GPL pipeline if we need to patch the
 vertex shader

Works around a game bug in Kingdom Come Deliverance and silences a validation
error.
---
 src/dxvk/dxvk_graphics.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/dxvk/dxvk_graphics.cpp b/src/dxvk/dxvk_graphics.cpp
index ec6b2147b..7a8ed26a0 100644
--- a/src/dxvk/dxvk_graphics.cpp
+++ b/src/dxvk/dxvk_graphics.cpp
@@ -1176,6 +1176,17 @@ namespace dxvk {
      && !state.rs.depthClipEnable())
       return false;
 
+    // If the vertex shader uses any input locations not provided by
+    // the input layout, we need to patch the shader.
+    uint32_t vsInputMask = m_shaders.vs->info().inputMask;
+    uint32_t ilAttributeMask = 0u;
+
+    for (uint32_t i = 0; i < state.il.attributeCount(); i++)
+      ilAttributeMask |= 1u << state.ilAttributes[i].location();
+
+    if ((vsInputMask & ilAttributeMask) != vsInputMask)
+      return false;
+
     if (m_shaders.tcs != nullptr) {
       // If tessellation shaders are present, the input patch
       // vertex count must match the shader's definition.