看到多少补多少
顶点输入类型
UnityCG.cginc Line:58
struct appdata_base {float4 vertex : POSITION;float3 normal : NORMAL;float4 texcoord : TEXCOORD0;UNITY_VERTEX_INPUT_INSTANCE_ID
};struct appdata_tan {float4 vertex : POSITION;float4 tangent : TANGENT;float3 normal : NORMAL;float4 texcoord : TEXCOORD0;UNITY_VERTEX_INPUT_INSTANCE_ID
};struct appdata_full {float4 vertex : POSITION;float4 tangent : TANGENT;float3 normal : NORMAL;float4 texcoord : TEXCOORD0;float4 texcoord1 : TEXCOORD1;float4 texcoord2 : TEXCOORD2;float4 texcoord3 : TEXCOORD3;fixed4 color : COLOR;UNITY_VERTEX_INPUT_INSTANCE_ID
};
内建一些变量
Transformations
All these matrices are float4x4 type.
| Name | Value |
| UNITY_MATRIX_MVP | Current model * view * projection matrix. |
| UNITY_MATRIX_MV | Current model * view matrix. |
| UNITY_MATRIX_V | Current view matrix. |
| UNITY_MATRIX_P | Current projection matrix. |
| UNITY_MATRIX_VP | Current view * projection matrix. |
| UNITY_MATRIX_T_MV | Transpose of model * view matrix. |
| UNITY_MATRIX_IT_MV | Inverse transpose of model * view matrix. |
| unity_ObjectToWorld | Current model matrix. |
| unity_WorldToObject | Inverse of current world matrix. |
Camera and screen
These variables will correspond to the Camera that is rendering. For example during shadowmap rendering, they will still refer to the Camera component values, and not the “virtual camera” that is used for the shadowmap projection.
| Name | Type | Value |
| _WorldSpaceCameraPos | float3 | World space position of the camera. |
| _ProjectionParams | float4 | x is 1.0 (or –1.0 if currently rendering with a flipped projection matrix), y is the camera’s near plane, z is the camera’s far plane and w is 1/FarPlane. |
| _ScreenParams | float4 | x is the width of the camera’s target texture in pixels, y is the height of the camera’s target texture in pixels, z is 1.0 + 1.0/width and w is 1.0 + 1.0/height. |
| _ZBufferParams | float4 | Used to linearize Z buffer values. x is (1-far/near), y is (far/near), z is (x/far) and w is (y/far). |
| unity_OrthoParams | float4 | x is orthographic camera’s width, y is orthographic camera’s height, z is unused and w is 1.0 when camera is orthographic, 0.0 when perspective. |
| unity_CameraProjection | float4x4 | Camera’s projection matrix. |
| unity_CameraInvProjection | float4x4 | Inverse of camera’s projection matrix. |
| unity_CameraWorldClipPlanes[6] | float4 | Camera frustum plane world space equations, in this order: left, right, bottom, top, near, far. |
Time
| Name | Type | Value |
| _Time | float4 | Time since level load (t/20, t, t*2, t*3), use to animate things inside the shaders. |
| _SinTime | float4 | Sine of time: (t/8, t/4, t/2, t). |
| _CosTime | float4 | Cosine of time: (t/8, t/4, t/2, t). |
| unity_DeltaTime | float4 | Delta time: (dt, 1/dt, smoothDt, 1/smoothDt). |
Lighting
灯光部分 根据LightMode 不同可用的内建数据也是不同的
Light parameters are passed to shaders in different ways depending on which Rendering Path is used, and which LightMode Pass Tag is used in the shader.
Forward rendering (ForwardBase and ForwardAdd pass types):
| Name | Type | Value |
| _LightColor0 (declared in Lighting.cginc) | fixed4 | Light color. |
| _WorldSpaceLightPos0 | float4 | Directional lights: (world space direction, 0). Other lights: (world space position, 1). |
| _LightMatrix0 (declared in AutoLight.cginc) | float4x4 | World-to-light matrix. Used to sample cookie & attenuation textures. |
| unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0 | float4 | (ForwardBase pass only) world space positions of first four non-important point lights. |
| unity_4LightAtten0 | float4 | (ForwardBase pass only) attenuation factors of first four non-important point lights. |
| unity_LightColor | half4[4] | (ForwardBase pass only) colors of of first four non-important point lights. |
| unity_WorldToShadow | float4x4[4] | World-to-shadow matrices. One matrix for spot lights, up to four for directional light cascades. |
Deferred shading and deferred lighting, used in the lighting pass shader (all declared in UnityDeferredLibrary.cginc):
| Name | Type | Value |
| _LightColor | float4 | Light color. |
| _LightMatrix0 | float4x4 | World-to-light matrix. Used to sample cookie & attenuation textures. |
| unity_WorldToShadow | float4x4[4] | World-to-shadow matrices. One matrix for spot lights, up to four for directional light cascades. |
Spherical harmonics coefficients (used by ambient and light probes) are set up for ForwardBase, PrePassFinal and Deferred pass types. They contain 3rd order SH to be evaluated by world space normal (see ShadeSH9 from UnityCG.cginc). The variables are all half4 type, unity_SHAr and similar names.
Vertex-lit rendering (Vertex pass type):
Up to 8 lights are set up for a Vertex pass type; always sorted starting from the brightest one. So if you want to render objects affected by two lights at once, you can just take first two entries in the arrays. If there are less lights affecting the object than 8, the rest will have their color set to black.
| Name | Type | Value |
| unity_LightColor | half4[8] | Light colors. |
| unity_LightPosition | float4[8] | View-space light positions. (-direction,0) for directional lights; (position,1) for point/spot lights. |
| unity_LightAtten | half4[8] | Light attenuation factors. x is cos(spotAngle/2) or –1 for non-spot lights; y is 1/cos(spotAngle/4) or 1 for non-spot lights; z is quadratic attenuation; w is squared light range. |
| unity_SpotDirection | float4[8] | View-space spot light positions; (0,0,1,0) for non-spot lights. |
Fog and Ambient
| Name | Type | Value |
| unity_AmbientSky | fixed4 | Sky ambient lighting color in gradient ambient lighting case. |
| unity_AmbientEquator | fixed4 | Equator ambient lighting color in gradient ambient lighting case. |
| unity_AmbientGround | fixed4 | Ground ambient lighting color in gradient ambient lighting case. |
| UNITY_LIGHTMODEL_AMBIENT | fixed4 | Ambient lighting color (sky color in gradient ambient case). Legacy variable. |
| unity_FogColor | fixed4 | Fog color. |
| unity_FogParams | float4 | Parameters for fog calculation: (density / sqrt(ln(2)), density / ln(2), –1/(end-start), end/(end-start)). x is useful for Exp2 fog mode, y for Exp mode, z and w for Linear mode. |
Various
| Name | Type | Value |
| unity_LODFade | float4 | Level-of-detail fade when using LODGroup. x is fade (0..1), y is fade quantized to 16 levels, z and w unused. |
内建函数
Vertex transformation functions in UnityCG.cginc
| Function: | Description: |
|---|---|
float4 UnityObjectToClipPos(float3 pos) | Transforms a point from object space to the camera’s clip space in homogeneous coordinates. This is the equivalent of mul(UNITY_MATRIX_MVP, float4(pos, 1.0)), and should be used in its place. |
float3 UnityObjectToViewPos(float3 pos) | Transforms a point from object space to view space. This is the equivalent of mul(UNITY_MATRIX_MV, float4(pos, 1.0)).xyz, and should be used in its place.
|
Generic helper functions in UnityCG.cginc
| Function: | Description: |
|---|---|
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
These functions are only useful when using forward rendering (ForwardBase or ForwardAdd pass types).
| Function: | Description: |
|---|---|
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
The following functions are helpers to compute coordinates used for sampling screen-space textures. They return float4 where the final coordinate to sample texture with can be computed via perspective division (for example xy/w).
The functions also take care of platform differences in render texture coordinates.
| Function: | Description: |
|---|---|
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
These functions are only useful when using per-vertex lit shaders (“Vertex” pass type).
| Function: | Description: |
|---|---|
float3 ShadeVertexLights (float4 vertex, float3 normal) | Computes illumination from four per-vertex lights and ambient, given object space position & normal. |
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