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近期才发现Unity3D还有一个访问硬件设备信息的类SystemInfo。
概述：
UnityEngine.SystemInfo类中的属性都是只读属性，存储着运行平台的一些硬件信息，找出底层平台和硬件的功能，如：设备的名称、设备的类型、显卡的类型，显卡的名称、显卡供应商（制造商）、系统内存大小、显存大小、支持的渲染目标数量等等。我们也可以检查支持哪些RenderTexture(渲染纹理)格式(SupportsRenderTextureFormat)，CPU有多少可用的线程的(processorCount)等等。
SystemInfo类中的静态变量：
中文显示：
Rendering.CopyTextureSupport copyTextureSupport：（只读）支持多种复制纹理功能的情况。
string deviceModel：（只读）设备的模型或模式。
string deviceName：（只读）用户定义的设备名称。
DeviceType deviceType：（只读）返回程序运行所在的设备类型（PC电脑、掌上型等）。
string deviceUniqueIdentifier：（只读）设备的唯一标识符。每一台设备都有唯一的标识符。
int graphicsDeviceID：（只读）显卡的唯一标识符ID。
string graphicsDeviceName：（只读）显卡的名称。
Rending.GraphicsDeviceType graphicsDeviceType：（只读）显卡的类型。
string graphicsDeviceVendor：（只读）显卡的供应商。
int graphicsDeviceVendorID：（只读）显卡供应商的唯一识别码ID。
string graphicsDeviceVersion：（只读）显卡的类型和版本。
int graphicsMemorySize：（只读）显存大小。
bool graphicsMultiThreaded：（只读）是否支持多线程渲染？
int graphicsShaderLevel：（只读）显卡着色器的级别。
int maxTextureSize：（只读）支持的最大纹理大小。
NPOTSupport npotSupport：（只读）GPU支持的NPOT纹理。
string operatingSystem：（只读）操作系统的版本名称。
int processorCount：（只读）当前处理器的数量。
int processorFrequency：（只读）处理器的频率。
string processorType：（只读）处理器的名称。
int supportedRenderTargetCount：（只读）支持渲染多少目标纹理。
bool supports2DArrayTextures：（只读）是否支持2D数组纹理。
bool supports3DTextures：（只读）是否支持3D（体积）纹理。
bool supportsAccelerometer：（只读）是否支持获取加速度计。
bool supportsAudio：（只读）是否支持获取用于回放的音频设备。
bool supportsComputeShaders：（只读）是否支持计算着色器。
bool supportsGyroscope：是否支持获取陀螺仪。
bool supportsImageEffects：（只读）是否支持图形特效。
bool supportsInstancing：（只读）是否支持实例化GPU的Draw Call。
bool supportsLocationService：是否支持定位功能。
bool supportsMotionVectors：是否支持运动向量。
bool supportsRawShadowDepthSampling：（只读）是否支持阴影深度。
bool supportsRenderTextures：（只读）是否支持渲染纹理。
bool supportsRenderToCubemap：（只读）是否支持立方体纹理。
bool supportsShadows：（只读）是否支持内置阴影。
bool supportsSparseTextures：（只读）是否支持稀疏纹理。
bool supportsStencil：（只读）是否支持模版缓存。
bool supportsVibration：是否支持用户触摸震动反馈。
int systemMemorySize：（只读）系统内存大小。
string unsupportedIdentifier：不支持运行在当前设备的SystemInfo属性值。
官方文档英文显示：
| 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). |
| maxTextureSize | Maximum texture size (Read Only). |
| npotSupport | What NPOT (non-power of two size) texture support does the GPU provide? (Read Only) |
| operatingSystem | Operating system name with version (Read Only). |
| processorCount | Number of processors present (Read Only). |
| processorFrequency | Processor frequency in MHz (Read Only). |
| processorType | Processor name (Read Only). |
| supportedRenderTargetCount | How many simultaneous render targets (MRTs) are supported? (Read Only) |
| supports2DArrayTextures | Are 2D Array textures supported? (Read Only) |
| supports3DTextures | Are 3D (volume) textures supported? (Read Only) |
| supportsAccelerometer | Is an accelerometer available on the device? |
| supportsAudio | Is there an Audio device available for playback? |
| supportsComputeShaders | Are compute shaders supported? (Read Only) |
| supportsGyroscope | Is a gyroscope available on the device? |
| supportsImageEffects | Are image effects supported? (Read Only) |
| supportsInstancing | Is GPU draw call instancing supported? (Read Only) |
| supportsLocationService | Is the device capable of reporting its location? |
| supportsMotionVectors | Are motion vectors supported. |
| supportsRawShadowDepthSampling | Is sampling raw depth from shadowmaps supported? (Read Only) |
| supportsRenderTextures | Are render textures supported? (Read Only) |
| supportsRenderToCubemap | Are cubemap render textures supported? (Read Only) |
| supportsShadows | Are built-in shadows supported? (Read Only) |
| supportsSparseTextures | Are sparse textures supported? (Read Only) |
| supportsStencil | Is the stencil buffer 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. |
SystemInfo类中的函数：
bool SupportsRenderTextureFormat(
RenderTextureFormat format);
输入一个渲染纹理的格式，判断设备是否支持这种格式
bool SupportsTextureFormat(
TextureFormat format);
输入一个纹理的格式，判断设备是否支持这种格式。