一：標准庫里的常用.cginc文件
HLSLSupport.cginc- (automatically included) Helper macros and definitions for cross-platform shader compilation.
HLSLSupport.cginc ：（自動包含）跨平台着色器編譯幫助宏和定義UnityCG.cginc- commonly used global variables and helper functions.
UnityCG.cginc ：常用的全局變量和輔助函數AutoLight.cginc- lighting & shadowing functionality, e.g. surface shaders use this file internally.
AutoLight.cginc ：燈光和陰影功能，例如surface shaders 內在地使用此文件。Lighting.cginc- standard surface shader lighting models; automatically included when you're writing surface shaders.
Lighting.cginc ：標准surface shader 燈光模型，當你寫表面着色器時自動包含。TerrainEngine.cginc- helper functions for Terrain & Vegetation shaders.
TerrainEngine.cginc ： 地形和植被着色器的輔助函數。
二：輔助函數
Generic helper functions in UnityCG.cginc 在UnityCG.cginc中的通用輔助函數
float3 WorldSpaceViewDir (float4 v)- returns world space direction (not normalized) from given object space vertex position towards the camera.
float3 WorldSpaceViewDir (float4 v)：根據給定的局部空間頂點位置到相機返回世界空間的方向（非規范化的）float3 ObjSpaceViewDir (float4 v)- returns object space direction (not normalized) from given object space vertex position towards the camera.
float3 ObjSpaceViewDir (float4 v)：根據給定的局部空間頂點位置到相機返回局部空間的方向（非規范化的）float2 ParallaxOffset (half h, half height, half3 viewDir)- calculates UV offset for parallax normal mapping.
float2 ParallaxOffset (half h, half height, half3 viewDir)：為視差法線貼圖計算UV偏移fixed Luminance (fixed3 c)- converts color to luminance (grayscale).
fixed Luminance (fixed3 c)：將顏色轉換為亮度（灰度）fixed3 DecodeLightmap (fixed4 color)- decodes color from Unity lightmap (RGBM or dLDR depending on platform).
fixed3 DecodeLightmap (fixed4 color)：從Unity光照貼圖解碼顏色（基於平台為RGBM 或dLDR）float4 EncodeFloatRGBA (float v)- encodes [0..1) range float into RGBA color, for storage in low precision render target.
float4 EncodeFloatRGBA (float v)：為儲存低精度的渲染目標，編碼[0..1)范圍的浮點數到RGBA顏色。float DecodeFloatRGBA (float4 enc)- decodes RGBA color into a float.
float DecodeFloatRGBA (float4 enc)：解碼RGBA顏色到float。- Similarly,
float2 EncodeFloatRG (float v)andfloat DecodeFloatRG (float2 enc)that use two color channels.
同樣的，float2 EncodeFloatRG (float v) 和float DecodeFloatRG (float2 enc)使用的是兩個顏色通道。 float2 EncodeViewNormalStereo (float3 n)- encodes view space normal into two numbers in 0..1 range.
float2 EncodeViewNormalStereo (float3 n)：編碼視圖空間法線到在0到1范圍的兩個數。float3 DecodeViewNormalStereo (float4 enc4)- decodes view space normal from enc4.xy.
float3 DecodeViewNormalStereo (float4 enc4)：從enc4.xy解碼視圖空間法線
Forward rendering helper functions in UnityCG.cginc
UnityCG.cginc正向渲染輔助函數
These functions are only useful when using forward rendering (ForwardBase or ForwardAdd pass types).
這些函數只有當使用forward rendering（ForwardBase 或 ForwardAdd通道類型）時才有效。
float3 WorldSpaceLightDir (float4 v)- computes world space direction (not normalized) to light, given object space vertex position.
根據局部空間頂點位置計算世界空間燈光方向（非規范化的）。float3 ObjSpaceLightDir (float4 v)- computes object space direction (not normalized) to light, given object space vertex position.
根據局部空間頂點位置計算局部空間燈光方向（非規范化的）。float3 Shade4PointLights (...)- computes illumination from four point lights, with light data tightly packed into vectors. Forward rendering uses this to compute per-vertex lighting.
從4個點光源計算亮度，來將光照數據牢固的裝入向量中。正向渲染使用此來計算逐頂點光照。
Vertex-lit helper functions in UnityCG.cginc
UnityCG.cginc中的頂點光照輔助函數
These functions are only useful when using per-vertex lit shaders ("Vertex" pass type).
這些函數只在當使用逐頂點光照着色器（“頂點”通道類型）時才有效。
float3 ShadeVertexLights (float4 vertex, float3 normal)- computes illumination from four per-vertex lights and ambient, given object space position & normal.
根據局部空間位置和法線，從4個逐頂點燈光和環境光計算亮度。
三：內置變量 http://docs.unity3d.com/Manual/SL-UnityShaderVariables.html
unity_SpecCube0,unity_SpecCube0_HDRfrom the built-in shader variables. unity_SpecCube0 contains data for the active reflection probe. //unity_SpecCube0包含了現在激活的反射探頭， unity_SpecCube0_HDR是其HDR顏色數據。