Describe the bug

Hello!! I'm trying to run the demo, but I get the following error
`PS C:\Users\a.pidlypnyi> go run cogentcore.org/core/examples/demo@main
2025/10/09 23:26:17 panic: runtime error: index out of range [0] with length 0
2025/10/09 23:26:17
2025/10/09 23:26:17 ----- START OF STACK TRACE: -----
2025/10/09 23:26:17 goroutine 1 [running, locked to thread]:
runtime/debug.Stack()
C:/Go/src/runtime/debug/stack.go:26 +0x5e
cogentcore.org/core/system.HandleRecoverBase({0x7ff7a65641c0, 0xc00d1ea018})
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/recover.go:50 +0x4b
cogentcore.org/core/core.handleRecover({0x7ff7a65641c0, 0xc00d1ea018})
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/recover.go:39 +0x52
cogentcore.org/core/core.(*Stage).run.func1()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:342 +0x24
panic({0x7ff7a65641c0?, 0xc00d1ea018?})
C:/Go/src/runtime/panic.go:783 +0x132
cogentcore.org/core/gpu.(*Surface).InitConfig(0xc002170008)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:143 +0x23b
cogentcore.org/core/gpu.(*Surface).init(0xc002170008, 0x1d?, 0x400000002?, {0xc002a08078?, 0xc002a08018?}, 0x1, 0x0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:83 +0x10b
cogentcore.org/core/gpu.NewSurface(0xc002a08000, 0xc00cef3320, {0x5a?, 0x120?}, 0x1, 0x0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:60 +0xb8
cogentcore.org/core/system/driver/desktop.(*App).NewWindow.func2()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/desktop/app.go:129 +0x145
cogentcore.org/core/system/driver/base.(*App).RunOnMain(0x0?, 0x0?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/base/app.go:91 +0x9b
cogentcore.org/core/system/driver/desktop.(*App).NewWindow(0x7ff7a7567d00, 0xc00d9f42a0?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/desktop/app.go:118 +0x3e5
cogentcore.org/core/core.newRenderWindow({0xc001aaa1e0, 0x22}, {0x7ff7a662c9b9, 0x10}, 0xc00d9f42a0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/renderwindow.go:125 +0xa2
cogentcore.org/core/core.(*Stage).newRenderWindow(0xc00294ec00)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:404 +0x2eb
cogentcore.org/core/core.(*Stage).runWindow(0xc00294ec00)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:270 +0x685
cogentcore.org/core/core.(*Stage).run(0x4?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:345 +0x88
cogentcore.org/core/core.(*Stage).Run(0xc000000000?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:324 +0x7a
cogentcore.org/core/core.(*Body).RunWindow(0xc002973508?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:87 +0x47
cogentcore.org/core/core.(*Body).RunMainWindow(0xc000218a88?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:47 +0x28
main.main()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/examples/demo/demo.go:45 +0xcf

2025/10/09 23:26:17 ----- END OF STACK TRACE -----
2025/10/09 23:26:17 SAVED CRASH LOG TO C:\Users\a.pidlypnyi\AppData\Roaming\Cogent\ Core\ Demo\crash-logs\crash_2025-10-09_23-26-17
2025/10/09 23:26:17 panic: runtime error: index out of range [0] with length 0
2025/10/09 23:26:17
2025/10/09 23:26:17 ----- START OF STACK TRACE: -----
2025/10/09 23:26:17 goroutine 1 [running, locked to thread]:
runtime/debug.Stack()
C:/Go/src/runtime/debug/stack.go:26 +0x5e
cogentcore.org/core/system.HandleRecoverBase({0x7ff7a65641c0, 0xc00bf09680})
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/recover.go:50 +0x4b
cogentcore.org/core/core.handleRecover({0x7ff7a65641c0, 0xc00bf09680})
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/recover.go:39 +0x52
cogentcore.org/core/core.(*Stage).run.func1()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:342 +0x24
panic({0x7ff7a65641c0?, 0xc00bf09680?})
C:/Go/src/runtime/panic.go:783 +0x132
cogentcore.org/core/gpu.(*Surface).InitConfig(0xc00cb9e008)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:143 +0x23b
cogentcore.org/core/gpu.(*Surface).init(0xc00cb9e008, 0x7ff7a5617ba6?, 0x0?, {0x0?, 0xc00bf15fcc?}, 0x1, 0x0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:83 +0x10b
cogentcore.org/core/gpu.NewSurface(0xc002a08000, 0xc00bf15fd0, {0xb4?, 0x120?}, 0x1, 0x0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:60 +0xb8
cogentcore.org/core/system/driver/desktop.(*App).NewWindow.func2()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/desktop/app.go:129 +0x145
cogentcore.org/core/system/driver/base.(*App).RunOnMain(0x0?, 0x0?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/base/app.go:91 +0x9b
cogentcore.org/core/system/driver/desktop.(*App).NewWindow(0x7ff7a7567d00, 0xc00059dc20?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/desktop/app.go:118 +0x3e5
cogentcore.org/core/core.newRenderWindow({0xc00ac02180, 0x37}, {0xc00212c0c0, 0x25}, 0xc00059dc20)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/renderwindow.go:125 +0xa2
cogentcore.org/core/core.(*Stage).newRenderWindow(0xc000646180)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:404 +0x2eb
cogentcore.org/core/core.(*Stage).runWindow(0xc000646180)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:270 +0x685
cogentcore.org/core/core.(*Stage).run(0x1?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:345 +0x88
cogentcore.org/core/core.(*Stage).Run(0x7ff700000000?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:324 +0x7a
cogentcore.org/core/core.(*Body).RunWindow(0x0?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:87 +0x47
cogentcore.org/core/core.handleRecover({0x7ff7a65641c0, 0xc00d1ea018})
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/recover.go:85 +0x457
cogentcore.org/core/core.(*Stage).run.func1()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:342 +0x24
panic({0x7ff7a65641c0?, 0xc00d1ea018?})
C:/Go/src/runtime/panic.go:783 +0x132
cogentcore.org/core/gpu.(*Surface).InitConfig(0xc002170008)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:143 +0x23b
cogentcore.org/core/gpu.(*Surface).init(0xc002170008, 0x1d?, 0x400000002?, {0xc002a08078?, 0xc002a08018?}, 0x1, 0x0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:83 +0x10b
cogentcore.org/core/gpu.NewSurface(0xc002a08000, 0xc00cef3320, {0x5a?, 0x120?}, 0x1, 0x0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/gpu/surface.go:60 +0xb8
cogentcore.org/core/system/driver/desktop.(*App).NewWindow.func2()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/desktop/app.go:129 +0x145
cogentcore.org/core/system/driver/base.(*App).RunOnMain(0x0?, 0x0?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/base/app.go:91 +0x9b
cogentcore.org/core/system/driver/desktop.(*App).NewWindow(0x7ff7a7567d00, 0xc00d9f42a0?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/system/driver/desktop/app.go:118 +0x3e5
cogentcore.org/core/core.newRenderWindow({0xc001aaa1e0, 0x22}, {0x7ff7a662c9b9, 0x10}, 0xc00d9f42a0)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/renderwindow.go:125 +0xa2
cogentcore.org/core/core.(*Stage).newRenderWindow(0xc00294ec00)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:404 +0x2eb
cogentcore.org/core/core.(*Stage).runWindow(0xc00294ec00)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:270 +0x685
cogentcore.org/core/core.(*Stage).run(0x4?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:345 +0x88
cogentcore.org/core/core.(*Stage).Run(0xc000000000?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/stage.go:324 +0x7a
cogentcore.org/core/core.(*Body).RunWindow(0xc002973508?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:87 +0x47
cogentcore.org/core/core.(*Body).RunMainWindow(0xc000218a88?)
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/core/mainstage.go:47 +0x28
main.main()
C:/Users/a.pidlypnyi/go/pkg/mod/cogentcore.org/core@v0.3.13-0.20250930215142-fc14ccae29d7/examples/demo/demo.go:45 +0xcf

2025/10/09 23:26:17 ----- END OF STACK TRACE -----
2025/10/09 23:26:17 SAVED CRASH LOG TO C:\Users\a.pidlypnyi\AppData\Roaming\Cogent\ Core\ Demo\crash-logs\crash_2025-10-09_23-26-17`

webgpuinfo
`Default WebGPU Adapter number: 0 Type: cpu Backend: d3d12
Set the GPU_DEVICE environment variable to an adapter number to select a different GPU

#####################################################################
WebGPU Adapter number: 0 Type: cpu Backend: d3d12
{
"VendorId": 5140,
"VendorName": "0x1414",
"Architecture": "",
"DeviceId": 140,
"Name": "0x8c",
"DriverDescription": "Microsoft Basic Render Driver",
"AdapterType": 2,
"BackendType": 4
}

{
"Limits": {
"MaxTextureDimension1D": 16384,
"MaxTextureDimension2D": 16384,
"MaxTextureDimension3D": 2048,
"MaxTextureArrayLayers": 2048,
"MaxBindGroups": 8,
"MaxBindingsPerBindGroup": 65535,
"MaxDynamicUniformBuffersPerPipelineLayout": 8,
"MaxDynamicStorageBuffersPerPipelineLayout": 4,
"MaxSampledTexturesPerShaderStage": 1048576,
"MaxSamplersPerShaderStage": 2048,
"MaxStorageBuffersPerShaderStage": 262144,
"MaxStorageTexturesPerShaderStage": 262144,
"MaxUniformBuffersPerShaderStage": 1048576,
"MaxUniformBufferBindingSize": 65536,
"MaxStorageBufferBindingSize": 2147483648,
"MinUniformBufferOffsetAlignment": 256,
"MinStorageBufferOffsetAlignment": 32,
"MaxVertexBuffers": 16,
"MaxBufferSize": 2147483647,
"MaxVertexAttributes": 32,
"MaxVertexBufferArrayStride": 2048,
"MaxInterStageShaderComponents": 60,
"MaxInterStageShaderVariables": 0,
"MaxColorAttachments": 0,
"MaxColorAttachmentBytesPerSample": 0,
"MaxComputeWorkgroupStorageSize": 16384,
"MaxComputeInvocationsPerWorkgroup": 768,
"MaxComputeWorkgroupSizeX": 1024,
"MaxComputeWorkgroupSizeY": 1024,
"MaxComputeWorkgroupSizeZ": 64,
"MaxComputeWorkgroupsPerDimension": 65535,
"MaxPushConstantSize": 30146560
}
}

#####################################################################
WebGPU Adapter number: 1 Type: unknown Backend: open-gl
{
"VendorId": 0,
"VendorName": "0x0",
"Architecture": "",
"DeviceId": 0,
"Name": "0x0",
"DriverDescription": "D3D12 (Microsoft Basic Render Driver)",
"AdapterType": 3,
"BackendType": 7
}

{
"Limits": {
"MaxTextureDimension1D": 16384,
"MaxTextureDimension2D": 16384,
"MaxTextureDimension3D": 2048,
"MaxTextureArrayLayers": 2048,
"MaxBindGroups": 8,
"MaxBindingsPerBindGroup": 65535,
"MaxDynamicUniformBuffersPerPipelineLayout": 14,
"MaxDynamicStorageBuffersPerPipelineLayout": 16,
"MaxSampledTexturesPerShaderStage": 16,
"MaxSamplersPerShaderStage": 16,
"MaxStorageBuffersPerShaderStage": 16,
"MaxStorageTexturesPerShaderStage": 32,
"MaxUniformBuffersPerShaderStage": 14,
"MaxUniformBufferBindingSize": 65536,
"MaxStorageBufferBindingSize": 134217728,
"MinUniformBufferOffsetAlignment": 256,
"MinStorageBufferOffsetAlignment": 32,
"MaxVertexBuffers": 16,
"MaxBufferSize": 2147483647,
"MaxVertexAttributes": 16,
"MaxVertexBufferArrayStride": 2048,
"MaxInterStageShaderComponents": 124,
"MaxInterStageShaderVariables": 0,
"MaxColorAttachments": 0,
"MaxColorAttachmentBytesPerSample": 0,
"MaxComputeWorkgroupStorageSize": 32768,
"MaxComputeInvocationsPerWorkgroup": 1024,
"MaxComputeWorkgroupSizeX": 1024,
"MaxComputeWorkgroupSizeY": 1024,
"MaxComputeWorkgroupSizeZ": 64,
"MaxComputeWorkgroupsPerDimension": 65535,
"MaxPushConstantSize": 30146560
}
}`

On another virtual machine, the application runs
`Default WebGPU Adapter number: 0 Type: cpu Backend: d3d12
Set the GPU_DEVICE environment variable to an adapter number to select a different GPU

#####################################################################
WebGPU Adapter number: 0 Type: cpu Backend: d3d12
{
"VendorId": 5140,
"VendorName": "0x1414",
"Architecture": "",
"DeviceId": 140,
"Name": "0x8c",
"DriverDescription": "Microsoft Basic Render Driver",
"AdapterType": 2,
"BackendType": 4
}

{
"Limits": {
"MaxTextureDimension1D": 16384,
"MaxTextureDimension2D": 16384,
"MaxTextureDimension3D": 2048,
"MaxTextureArrayLayers": 2048,
"MaxBindGroups": 8,
"MaxBindingsPerBindGroup": 65535,
"MaxDynamicUniformBuffersPerPipelineLayout": 8,
"MaxDynamicStorageBuffersPerPipelineLayout": 4,
"MaxSampledTexturesPerShaderStage": 1048576,
"MaxSamplersPerShaderStage": 2048,
"MaxStorageBuffersPerShaderStage": 262144,
"MaxStorageTexturesPerShaderStage": 262144,
"MaxUniformBuffersPerShaderStage": 1048576,
"MaxUniformBufferBindingSize": 65536,
"MaxStorageBufferBindingSize": 2147483648,
"MinUniformBufferOffsetAlignment": 256,
"MinStorageBufferOffsetAlignment": 32,
"MaxVertexBuffers": 16,
"MaxBufferSize": 2147483647,
"MaxVertexAttributes": 32,
"MaxVertexBufferArrayStride": 2048,
"MaxInterStageShaderComponents": 60,
"MaxInterStageShaderVariables": 0,
"MaxColorAttachments": 0,
"MaxColorAttachmentBytesPerSample": 0,
"MaxComputeWorkgroupStorageSize": 16384,
"MaxComputeInvocationsPerWorkgroup": 768,
"MaxComputeWorkgroupSizeX": 1024,
"MaxComputeWorkgroupSizeY": 1024,
"MaxComputeWorkgroupSizeZ": 64,
"MaxComputeWorkgroupsPerDimension": 65535,
"MaxPushConstantSize": 0
}
}

`

How to reproduce

Proxmox VM Windows 10

Example code

Relevant output

Platform

Windows