From 144f4badef6fd9e12485ea798d5a9d8f64e2541f Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Sat, 26 Oct 2019 23:13:59 +0200
Subject: [PATCH] [dxbc] Always allocate at least one input array element

Turns out that shaders with no inputs can still have an input signature,
in which case we were generating a zero-length array which is illegal.
---
 src/dxbc/dxbc_compiler.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dxbc/dxbc_compiler.cpp b/src/dxbc/dxbc_compiler.cpp
index 7db161ffa..4947a4f8e 100644
--- a/src/dxbc/dxbc_compiler.cpp
+++ b/src/dxbc/dxbc_compiler.cpp
@@ -7039,7 +7039,7 @@ namespace dxvk {
     // Define the array type. This will be two-dimensional
     // in some shaders, with the outer index representing
     // the vertex ID within an invocation.
-    m_vArrayLength   = m_isgn != nullptr ? m_isgn->maxRegisterCount() : 1;
+    m_vArrayLength   = m_isgn != nullptr ? std::max(1u, m_isgn->maxRegisterCount()) : 1;
     m_vArrayLengthId = m_module.lateConst32(getScalarTypeId(DxbcScalarType::Uint32));
 
     uint32_t vectorTypeId = getVectorTypeId(info);