知識點
1.唯一的設備標識符。保證每個設備都是唯一的（只讀）：SystemInfo.deviceUniqueIdentifier
2.當前電池電量：SystemInfo.deviceUniqueIdentifier
3.設備的型號（只讀）：SystemInfo.deviceModel
4.用戶定義的設備名稱（只讀）：SystemInfo.deviceName
5.返回應用程序在其上運行的設備的類型（只讀）：SystemInfo.deviceType
6.帶有版本的操作系統名稱（只讀）：SystemInfo.operatingSystem
7.設備上有陀螺儀嗎？：SystemInfo.supportsGyroscope
8.存在的系統內存量（只讀）：SystemInfo.systemMemorySize
9.存在的視頻內存量（只讀）：SystemInfo.graphicsMemorySize
SystemInfo 類
官網參考地址：https://docs.unity3d.com/ScriptReference/SystemInfo.html
描述
訪問系統和硬件信息。
使用此類可以瞭解基礎平臺和硬件的功能。例如，您可以檢查支持哪些RenderTexture格式（SupportsRenderTextureFormat），多少個CPU線程可用（processorCount），等等。
Static Properties
| batteryLevel | The current battery level (Read Only). |
| batteryStatus | Returns the current status of the device's battery (Read Only). |
| copyTextureSupport | Support for various Graphics.CopyTexture cases (Read Only). |
| deviceModel | The model of the device (Read Only). |
| deviceName | The user defined name of the device (Read Only). |
| deviceType | Returns the kind of device the application is running on (Read Only). |
| deviceUniqueIdentifier | A unique device identifier. It is guaranteed to be unique for every device (Read Only). |
| graphicsDeviceID | The identifier code of the graphics device (Read Only). |
| graphicsDeviceName | The name of the graphics device (Read Only). |
| graphicsDeviceType | The graphics API type used by the graphics device (Read Only). |
| graphicsDeviceVendor | The vendor of the graphics device (Read Only). |
| graphicsDeviceVendorID | The identifier code of the graphics device vendor (Read Only). |
| graphicsDeviceVersion | The graphics API type and driver version used by the graphics device (Read Only). |
| graphicsMemorySize | Amount of video memory present (Read Only). |
| graphicsMultiThreaded | Is graphics device using multi-threaded rendering (Read Only)? |
| graphicsShaderLevel | Graphics device shader capability level (Read Only). |
| graphicsUVStartsAtTop | Returns true if the texture UV coordinate convention for this platform has Y starting at the top of the image. |
| hasDynamicUniformArrayIndexingInFragmentShaders | Returns true when the GPU has native support for indexing uniform arrays in fragment shaders without restrictions. |
| hasHiddenSurfaceRemovalOnGPU | True if the GPU supports hidden surface removal. |
| hasMipMaxLevel | Returns true if the GPU supports partial mipmap chains (Read Only). |
| maxComputeBufferInputsCompute | Determines how many compute buffers Unity supports simultaneously in a compute shader for reading. (Read Only) |
| maxComputeBufferInputsDomain | Determines how many compute buffers Unity supports simultaneously in a domain shader for reading. (Read Only) |
| maxComputeBufferInputsFragment | Determines how many compute buffers Unity supports simultaneously in a fragment shader for reading. (Read Only) |
| maxComputeBufferInputsGeometry | Determines how many compute buffers Unity supports simultaneously in a geometry shader for reading. (Read Only) |
| maxComputeBufferInputsHull | Determines how many compute buffers Unity supports simultaneously in a hull shader for reading. (Read Only) |
| maxComputeBufferInputsVertex | Determines how many compute buffers Unity supports simultaneously in a vertex shader for reading. (Read Only) |
| maxComputeWorkGroupSize | The largest total number of invocations in a single local work group that can be dispatched to a compute shader (Read Only). |
| maxComputeWorkGroupSizeX | The maximum number of work groups that a compute shader can use in X dimension (Read Only). |
| maxComputeWorkGroupSizeY | The maximum number of work groups that a compute shader can use in Y dimension (Read Only). |
| maxComputeWorkGroupSizeZ | The maximum number of work groups that a compute shader can use in Z dimension (Read Only). |
| maxCubemapSize | Maximum Cubemap texture size (Read Only). |
| maxTextureSize | Maximum texture size (Read Only). |
| minConstantBufferOffsetAlignment | Minimum buffer offset (in bytes) when binding a constant buffer using Shader.SetConstantBuffer or Material.SetConstantBuffer. |
| npotSupport | What NPOT (non-power of two size) texture support does the GPU provide? (Read Only) |
| operatingSystem | Operating system name with version (Read Only). |
| operatingSystemFamily | Returns the operating system family the game is running on (Read Only). |
| processorCount | Number of processors present (Read Only). |
| processorFrequency | Processor frequency in MHz (Read Only). |
| processorType | Processor name (Read Only). |
| renderingThreadingMode | Application's actual rendering threading mode (Read Only). |
| supportedRandomWriteTargetCount | The maximum number of random write targets (UAV) that Unity supports simultaneously. (Read Only) |
| supportedRenderTargetCount | How many simultaneous render targets (MRTs) are supported? (Read Only) |
| supports2DArrayTextures | Are 2D Array textures supported? (Read Only) |
| supports32bitsIndexBuffer | Are 32-bit index buffers supported? (Read Only) |
| supports3DRenderTextures | Are 3D (volume) RenderTextures supported? (Read Only) |
| supports3DTextures | Are 3D (volume) textures supported? (Read Only) |
| supportsAccelerometer | Is an accelerometer available on the device? |
| supportsAsyncCompute | Returns true when the platform supports asynchronous compute queues and false if otherwise. |
| supportsAsyncGPUReadback | Returns true if asynchronous readback of GPU data is available for this device and false otherwise. |
| supportsAudio | Is there an Audio device available for playback? (Read Only) |
| supportsComputeShaders | Are compute shaders supported? (Read Only) |
| supportsCubemapArrayTextures | Are Cubemap Array textures supported? (Read Only) |
| supportsGeometryShaders | Are geometry shaders supported? (Read Only) |
| supportsGraphicsFence | Returns true when the platform supports GraphicsFences, and false if otherwise. |
| supportsGyroscope | Is a gyroscope available on the device? |
| supportsHardwareQuadTopology | Does the hardware support quad topology? (Read Only) |
| supportsInstancing | Is GPU draw call instancing supported? (Read Only) |
| supportsLocationService | Is the device capable of reporting its location? |
| supportsMipStreaming | Is streaming of texture mip maps supported? (Read Only) |
| supportsMotionVectors | Whether motion vectors are supported on this platform. |
| supportsMultisampleAutoResolve | Returns true if multisampled textures are resolved automatically |
| supportsMultisampledTextures | Are multisampled textures supported? (Read Only) |
| supportsRawShadowDepthSampling | Is sampling raw depth from shadowmaps supported? (Read Only) |
| supportsRayTracing | Checks if ray tracing is supported by the current configuration. |
| supportsSeparatedRenderTargetsBlend | Returns true when the platform supports different blend modes when rendering to multiple render targets, or false otherwise. |
| supportsSetConstantBuffer | Does the current renderer support binding constant buffers directly? (Read Only) |
| supportsShadows | Are built-in shadows supported? (Read Only) |
| supportsSparseTextures | Are sparse textures supported? (Read Only) |
| supportsTessellationShaders | Are tessellation shaders supported? (Read Only) |
| supportsTextureWrapMirrorOnce | Returns true if the 'Mirror Once' texture wrap mode is supported. (Read Only) |
| supportsVibration | Is the device capable of providing the user haptic feedback by vibration? |
| systemMemorySize | Amount of system memory present (Read Only). |
| unsupportedIdentifier | Value returned by SystemInfo string properties which are not supported on the current platform. |
| usesLoadStoreActions | True if the Graphics API takes RenderBufferLoadAction and RenderBufferStoreAction into account, false if otherwise. |
| usesReversedZBuffer | This property is true if the current platform uses a reversed depth buffer (where values range from 1 at the near plane and 0 at far plane), and false if the depth buffer is normal (0 is near, 1 is far). (Read Only) |
Static Methods
| GetCompatibleFormat | Returns a format supported by the platform for the specified usage. |
| GetGraphicsFormat | Returns the platform-specific GraphicsFormat that is associated with the DefaultFormat. |
| IsFormatSupported | Verifies that the specified graphics format is supported for the specified usage. |
| SupportsBlendingOnRenderTextureFormat | Is blending supported on render texture format? |
| SupportsRenderTextureFormat | Is render texture format supported? |
| SupportsTextureFormat | Is texture format supported on this device? |
| SupportsVertexAttributeFormat | Indicates whether the given combination of a vertex attribute format and dimension is supported on this device. |