From 2d5b41080c444d0cbb3b28af0fcbd9293c0f26b9 Mon Sep 17 00:00:00 2001
From: goldislead <69987043+goldislead@users.noreply.github.com>
Date: Fri, 7 Aug 2026 19:04:00 -0700
Subject: [PATCH] [Vulkan] Clamp stacked-texture layer index for Inf/NaN coords

Co-authored-by: Herman S. <429230+has207@users.noreply.github.com>
---
 src/xenia/gpu/spirv_shader_translator_fetch.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/xenia/gpu/spirv_shader_translator_fetch.cc b/src/xenia/gpu/spirv_shader_translator_fetch.cc
index ec99debeb..fca5c9796 100644
--- a/src/xenia/gpu/spirv_shader_translator_fetch.cc
+++ b/src/xenia/gpu/spirv_shader_translator_fetch.cc
@@ -1469,6 +1469,14 @@ void SpirvShaderTranslator::ProcessTextureFetchInstruction(
             z_stacked = builder_->createNoContractionBinOp(
                 spv::OpFAdd, type_float_, z_stacked, z_offset);
           }
+          // Clamp the layer index to a valid range so an Inf or NaN coordinate
+          // does not select an undefined array layer.
+          z_stacked = builder_->createTriBuiltinCall(
+              type_float_, ext_inst_glsl_std_450_, GLSLstd450NClamp, z_stacked,
+              const_float_0_,
+              builder_->createNoContractionBinOp(
+                  spv::OpFSub, type_float_, z_size,
+                  builder_->makeFloatConstant(1.0f)));
           builder_->createBranch(&block_dimension_merge);
           // Select one of the two.
           builder_->setBuildPoint(&block_dimension_merge);