Vulkan: fix guest storage image and render-state handling (#332)

src/SharpEmu.ShaderCompiler/Gen5ShaderTranslator.cs

@@ -1576,11 +1576,37 @@ public static class Gen5ShaderTranslator
     private static bool IsMimgInstruction(string name) =>
         name.StartsWith("Image", StringComparison.Ordinal);
 
+    public static bool IsImageLoadOperation(string name) =>
+        name.StartsWith("ImageLoad", StringComparison.Ordinal);
+
     public static bool IsStorageImageOperation(string name) =>
-        name.StartsWith("ImageLoad", StringComparison.Ordinal) ||
         name.StartsWith("ImageStore", StringComparison.Ordinal) ||
         name.StartsWith("ImageAtomic", StringComparison.Ordinal);
 
+    public static bool RequiresStorageImage(
+        Gen5ImageBinding binding,
+        IReadOnlyList<Gen5ImageBinding> stageBindings)
+    {
+        if (IsStorageImageOperation(binding.Opcode))
+        {
+            return true;
+        }
+
+        if (!IsImageLoadOperation(binding.Opcode))
+        {
+            return false;
+        }
+
+        // IMAGE_LOAD itself is read-only and maps naturally to OpImageFetch,
+        // including for block-compressed textures which Vulkan cannot expose
+        // as storage images. Keep it as storage only when the same resolved
+        // descriptor is also written in this shader stage, preserving coherent
+        // read/write access through one storage-image representation.
+        return stageBindings.Any(candidate =>
+            IsStorageImageOperation(candidate.Opcode) &&
+            binding.ResourceDescriptor.SequenceEqual(candidate.ResourceDescriptor));
+    }
+
     public static bool IsDataShareAtomic(string name) => name switch
     {
         "DsAddU32" or "DsSubU32" or "DsIncU32" or "DsDecU32" or