From 88fdd4a2e9c39c0fea0315afb4a1511394b2256e Mon Sep 17 00:00:00 2001
From: Jake Turner <jake@evansturner.co.uk>
Date: Wed, 6 Nov 2024 07:34:44 +0000
Subject: [PATCH] Apply SampleBias bias correctly when debugging D3D12 Shaders

---
 renderdoc/driver/d3d12/d3d12_shaderdebug.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/renderdoc/driver/d3d12/d3d12_shaderdebug.cpp b/renderdoc/driver/d3d12/d3d12_shaderdebug.cpp
index cadafa278..5490fa0d9 100644
--- a/renderdoc/driver/d3d12/d3d12_shaderdebug.cpp
+++ b/renderdoc/driver/d3d12/d3d12_shaderdebug.cpp
@@ -321,6 +321,13 @@ bool D3D12ShaderDebug::CalculateSampleGather(
        sampleOp == DEBUG_SAMPLE_TEX_GATHER4_CMP || sampleOp == DEBUG_SAMPLE_TEX_GATHER4_PO_CMP)
       samp.ptr += sizeof(D3D12Descriptor);
 
+    if((sampleOp == DEBUG_SAMPLE_TEX_SAMPLE_BIAS || sampleOp == DEBUG_SAMPLE_TEX_SAMPLE_CMP_BIAS) &&
+       samplerData.bias != 0.0f)
+    {
+      D3D12_SAMPLER_DESC2 desc = descriptor.GetSampler();
+      desc.MipLODBias = RDCCLAMP(desc.MipLODBias + samplerData.bias, -15.99f, 15.99f);
+      descriptor.Init(&desc);
+    }
     descriptor.Create(D3D12_DESCRIPTOR_HEAP_TYPE_SAMPLER, device, samp);
   }