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Showing content from https://docs.unity3d.com/Manual/SL-UnityShaderVariables.html below:

Manual: Built-in shader variables reference

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Built-in shader variables reference

Unity’s built-in include files contain global variables for your shadersA program that runs on the GPU. More info
See in Glossary: things like current object’s transformation matrices, light parameters, current time and so on. You use them in shader programs like any other variable, but if you include the relevant include file, you don’t have to declare them.

For more information on include files, see Built-in include files.

Transformations

All these matrices are float4x4 type, and are column major.

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 CameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
See in Glossary 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 pixelsThe smallest unit in a computer image. Pixel size depends on your screen resolution. Pixel lighting is calculated at every screen pixel. More info
See in Glossary, 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. 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

Time is measured in seconds, and is scaled by the Time multiplier in your Project’s Time settings. There is no built-in variable that provides access to unscaled 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

Light parameters are passed to shaders in different ways depending on which Rendering PathThe technique that a render pipeline uses to render graphics. Choosing a different rendering path affects how lighting and shading are calculated. Some rendering paths are more suited to different platforms and hardware than others. More info
See in Glossary is used, and which LightMode Pass Tag is used in the shader.

Forward renderingA rendering path that renders each object in one or more passes, depending on lights that affect the object. Lights themselves are also treated differently by Forward Rendering, depending on their settings and intensity. More info
See in Glossary (ForwardBase and ForwardAdd pass types):

Name Type Value _LightColor0 (declared in UnityLightingCommon.cginc) fixed4 Light color. _WorldSpaceLightPos0 float4 Directional lights: (world space direction, 0). Other lights: (world space position, 1). unity_WorldToLight (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, used in the lighting pass shader (all declared in UnityDeferredLibrary.cginc):

Name Type Value _LightColor float4 Light color. unity_WorldToLight 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 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 fewer than eight lights affecting the object, 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 or 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 Lights positions; (0,0,1,0) for non-Spot Lights. Lightmaps Name Type Value unity_Lightmap Texture2D Contains lightmapA pre-rendered texture that contains the effects of light sources on static objects in the scene. Lightmaps are overlaid on top of scene geometry to create the effect of lighting. More info
See in Glossary information. unity_LightmapST float4[8] Scales and translates the UV information to the correct range to sample the lightmap texture. 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_IndirectSpecColor fixed4 If you use a skyboxA special type of Material used to represent skies. Usually six-sided. More info
See in Glossary, this is the average color of the skybox, which Unity calculates using the DC component of the spherical harmonics data in the ambient probe. Otherwise this is black. 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. _TextureSampleAdd float4 Set automatically by Unity for UI only based on whether the texture being used is in Alpha8 format (the value is set to (1,1,1,0)) or not (the value is set to (0,0,0,0)).

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Color and High Dynamic Range (HDR)

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