网址：Built-in shader helper functions
Built-in shader helper functions
Vertex transformation functions in UnityCG.cginc
- float4 UnityObjectToClipPos(float3 pos) 将点从物体坐标空间转到齐次坐标
- float3 UnityObjectToViewPos(float3 pos) 将点从物体坐标空间转到视图坐标
Generic helper functions in UnityCG.cginc
- float3 WorldSpaceViewDir (float4 v) Returns world space direction (not normalized) from given object space vertex position towards the camera.
- float3 ObjSpaceViewDir (float4 v) Returns object space direction (not normalized) from given object space vertex position towards the camera.
- float2 ParallaxOffset (half h, half height, half3 viewDir) calculates UV offset for parallax normal mapping.
- fixed Luminance (fixed3 c) Converts color to luminance (grayscale).
- fixed3 DecodeLightmap (fixed4 color) Decodes color from Unity lightmap (RGBM or dLDR depending on platform).
- float4 EncodeFloatRGBA (float v) Encodes [0..1) range float into RGBA color, for storage in low precision render target.
- float DecodeFloatRGBA (float4 enc) Decodes RGBA color into a float.
- float2 EncodeFloatRG (float v) Encodes [0..1) range float into a float2.
- float DecodeFloatRG (float2 enc) Decodes a previously-encoded RG float.
- float2 EncodeViewNormalStereo (float3 n) Encodes view space normal into two numbers in 0..1 range.
- float3 DecodeViewNormalStereo (float4 enc4) Decodes view space normal from enc4.xy.
Forward rendering helper functions in UnityCG.cginc
- float3 WorldSpaceLightDir (float4 v) Computes world space direction (not normalized) to light, given object space vertex position.
- float3 ObjSpaceLightDir (float4 v) Computes object space direction (not normalized) to light, given object space vertex position.
- float3 Shade4PointLights (…) Computes illumination from four point lights, with light data tightly packed into vectors. Forward rendering uses this to compute per-vertex lighting.
Screen-space helper functions in UnityCG.cginc
- float4 ComputeScreenPos (float4 clipPos) Computes texture coordinate for doing a screenspace-mapped texture sample. Input is clip space position.
- float4 ComputeGrabScreenPos (float4 clipPos) Computes texture coordinate for sampling a GrabPass texure. Input is clip space position.
Vertex-lit helper functions in UnityCG.cginc
- float3 ShadeVertexLights (float4 vertex, float3 normal) Computes illumination from four per-vertex lights and ambient, given object space position & normal.
