From c77adc9de86a340f7c2818852a5f39623bf23bf2 Mon Sep 17 00:00:00 2001
From: iwubcode <iwubcode@users.noreply.github.com>
Date: Tue, 5 Aug 2025 22:45:09 -0500
Subject: [PATCH] VideoCommon: add hash functions for pipeline uid object

---
 Source/Core/VideoCommon/ShaderCacheUtils.cpp | 21 ++++++++++++++++++++
 Source/Core/VideoCommon/ShaderCacheUtils.h   | 13 +++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/Source/Core/VideoCommon/ShaderCacheUtils.cpp b/Source/Core/VideoCommon/ShaderCacheUtils.cpp
index 352bfff8a0..6f737898fe 100644
--- a/Source/Core/VideoCommon/ShaderCacheUtils.cpp
+++ b/Source/Core/VideoCommon/ShaderCacheUtils.cpp
@@ -148,4 +148,25 @@ GXPipelineUid ApplyDriverBugs(const GXPipelineUid& in)
 
   return out;
 }
+
+std::size_t PipelineToHash(const GXPipelineUid& in)
+{
+  XXH3_state_t pipeline_hash_state;
+  XXH3_INITSTATE(&pipeline_hash_state);
+  XXH3_64bits_reset_withSeed(&pipeline_hash_state, static_cast<XXH64_hash_t>(1));
+  UpdateHashWithPipeline(in, &pipeline_hash_state);
+  return XXH3_64bits_digest(&pipeline_hash_state);
+}
+
+void UpdateHashWithPipeline(const GXPipelineUid& in, XXH3_state_t* hash_state)
+{
+  XXH3_64bits_update(hash_state, &in.vertex_format->GetVertexDeclaration(),
+                     sizeof(PortableVertexDeclaration));
+  XXH3_64bits_update(hash_state, &in.blending_state, sizeof(BlendingState));
+  XXH3_64bits_update(hash_state, &in.depth_state, sizeof(DepthState));
+  XXH3_64bits_update(hash_state, &in.rasterization_state, sizeof(RasterizationState));
+  XXH3_64bits_update(hash_state, &in.gs_uid, sizeof(GeometryShaderUid));
+  XXH3_64bits_update(hash_state, &in.ps_uid, sizeof(PixelShaderUid));
+  XXH3_64bits_update(hash_state, &in.vs_uid, sizeof(VertexShaderUid));
+}
 }  // namespace VideoCommon
diff --git a/Source/Core/VideoCommon/ShaderCacheUtils.h b/Source/Core/VideoCommon/ShaderCacheUtils.h
index ffea798b9f..4a9b7b1696 100644
--- a/Source/Core/VideoCommon/ShaderCacheUtils.h
+++ b/Source/Core/VideoCommon/ShaderCacheUtils.h
@@ -3,9 +3,20 @@
 
 #pragma once
 
+#include <xxh3.h>
+
 #include "VideoCommon/GXPipelineTypes.h"
 
 namespace VideoCommon
 {
 GXPipelineUid ApplyDriverBugs(const GXPipelineUid& in);
-}
+
+// Returns a hash of the pipeline, hashing the
+// vertex declarations instead of the native vertex format
+// object
+std::size_t PipelineToHash(const GXPipelineUid& in);
+
+// Updates an existing hash with the hash of the pipeline
+void UpdateHashWithPipeline(const GXPipelineUid& in, XXH3_state_t* hash_state);
+
+}  // namespace VideoCommon