{"record":{"id":"a5fcbfe939208c1d","repo":"stride3d/stride","slug":"the-length-of-the-source-data-to-upload-is-larger-than-the","errorCode":null,"errorMessage":"The length of the source data to upload is larger than the size of the Buffer","messagePattern":"The length of the source data to upload is larger than the size of the Buffer","errorType":"exception","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"sources/engine/Stride.Graphics/Buffer.cs","lineNumber":495,"sourceCode":"        /// <param name=\"fromData\">The span of data to copy from.</param>\n        /// <param name=\"offsetInBytes\">The offset in bytes from the start of the Buffer where data is to be written.</param>\n        /// <exception cref=\"ArgumentException\">\n        ///   The length of <paramref name=\"fromData\"/> is larger than the size of the Buffer.\n        /// </exception>\n        /// <exception cref=\"ArgumentException\">\n        ///   <paramref name=\"offsetInBytes\"/> is only supported for Buffers declared with <see cref=\"GraphicsResourceUsage.Default\"/>.\n        /// </exception>\n        /// <remarks>\n        ///   See <see cref=\"CommandList.MapSubResource\"/> and <see cref=\"CommandList.UpdateSubResource\"/> for more information about\n        ///   usage and restrictions.\n        /// </remarks>\n        public unsafe void SetData<TData>(CommandList commandList, ReadOnlySpan<TData> fromData, int offsetInBytes = 0) where TData : unmanaged\n        {\n            // Check size validity of data to copy from\n            var fromDataAsBytes = fromData.AsBytes();\n            var fromDataSizeInBytes = fromDataAsBytes.Length;\n            if (fromDataAsBytes.Length > SizeInBytes)\n                throw new ArgumentException(\"The length of the source data to upload is larger than the size of the Buffer\");\n\n            // If the Buffer is declared as Default usage, we can only use UpdateSubresource, which is not optimal but better than nothing\n            if (Description.Usage == GraphicsResourceUsage.Default)\n            {\n                // Set up the dest region inside the Buffer\n                if (Description.BufferFlags.HasFlag(BufferFlags.ConstantBuffer))\n                {\n                    commandList.UpdateSubResource(this, subResourceIndex: 0, fromDataAsBytes);\n                }\n                else\n                {\n                    var destRegion = new ResourceRegion(left: offsetInBytes, top: 0, front: 0, right: offsetInBytes + fromDataSizeInBytes, bottom: 1, back: 1);\n                    commandList.UpdateSubResource(this, subResourceIndex: 0, fromDataAsBytes, destRegion);\n                }\n            }\n            else\n            {\n                if (offsetInBytes > 0)","sourceCodeStart":477,"sourceCodeEnd":513,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/engine/Stride.Graphics/Buffer.cs#L477-L513","documentation":"Buffer.SetData checks that the byte length of the source ReadOnlySpan<TData> does not exceed the buffer's SizeInBytes before uploading. Uploading more bytes than the buffer holds would overflow the GPU allocation, so the library fails fast with ArgumentException.","triggerScenarios":"Calling buffer.SetData(commandList, span) where span byte length > SizeInBytes, e.g. writing a full CPU-side struct array into a buffer created for fewer elements, or a mismatched TData size versus the buffer description.","commonSituations":"Scene data grew (more vertices/constants) but the buffer was allocated once at startup with a fixed size; switching a buffer between element types (float[] into a half-float-sized buffer); copy-pasted upload code with a stale size.","solutions":["Trim the source data so its byte length is <= buffer.SizeInBytes.","Recreate or resize the buffer to hold at least the source data (New<T>(device, data, flags)).","Compute the buffer size from the data itself instead of a hardcoded constant.","Confirm the TData element type matches what the buffer was allocated for."],"exampleFix":"// before\nvar buffer = Buffer.New<float>(device, 100, BufferFlags.VertexBuffer);\nbuffer.SetData(cmd, data); // data has 200 floats\n// after\nvar buffer = Buffer.New<float>(device, data.Length, BufferFlags.VertexBuffer);\nbuffer.SetData(cmd, data);","handlingStrategy":"validation","validationCode":"if (fromData.Length * sizeof(TData) > buffer.SizeInBytes)\n    throw new ArgumentException(\"Source data larger than buffer\");","typeGuard":"bool CanUpload<TData>(Buffer b, ReadOnlySpan<TData> src) where TData : unmanaged => src.AsBytes().Length <= b.SizeInBytes;","tryCatchPattern":"try { buffer.SetData(cmd, data); }\ncatch (ArgumentException ex) when (ex.Message.Contains(\"source data to upload\"))\n{\n    buffer = Buffer.New(device, data, flags); // resize buffer\n    buffer.SetData(cmd, data);\n}","preventionTips":["Allocate buffers from data.Length, not constants.","Resize buffers when dataset size changes.","Assert byte sizes in debug builds before upload."],"tags":["graphics","buffer","argument-validation","upload"],"backgroundTag":"value-out-of-range","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}