文章目录
- 前言
- 一、整体框架
- 1、该Shader是用于低端设备的
- 2、包含一个Properties
- 3、只有一个SubShader
- 4、如果SubShader错误，返回洋葱紫
- 5、调用自定义ShaderGUI面板
- 二、SubShader中
- 1、Tags
- 2、Pass
- 三、我们看一下ForwardLit的Pass
- 1、混合模式、深度写入、面皮剔除、透明测试都由属性面板控制
- 2、申明顶点着色器 和 片元着色器
- 3、申明变体
- 4、GPU实例化相关
- 5、主要实现的内容被Unity封装好了，方便其他Shader调用
- 四、Unity中URP内置SimpleLit代码
前言
我们在这篇文章中，来看一下URP自带的SimpleLit框架主要干了什么。可以用于之后写光照时借鉴。
一、整体框架
1、该Shader是用于低端设备的
2、包含一个Properties
3、只有一个SubShader
4、如果SubShader错误，返回洋葱紫
5、调用自定义ShaderGUI面板
二、SubShader中
1、Tags
- 渲染类型为不透明
- 渲染管线为URP
- 材质类型为 SimpleLit
- LOD = 300
2、Pass
- ForwardLit：主要实现光照效果的。
- ShadowCaster：主要实现阴影效果的。
- Universal2D：实现2D下的光照效果。
三、我们看一下ForwardLit的Pass
1、混合模式、深度写入、面皮剔除、透明测试都由属性面板控制
2、申明顶点着色器 和 片元着色器
3、申明变体
4、GPU实例化相关
5、主要实现的内容被Unity封装好了，方便其他Shader调用
四、Unity中URP内置SimpleLit代码
// Shader targeted for low end devices. Single Pass Forward Rendering.
Shader "MyShader/URP/Simple Lit"
{
// Keep properties of StandardSpecular shader for upgrade reasons.
Properties
{
[MainTexture] _BaseMap("Base Map (RGB) Smoothness / Alpha (A)", 2D) = "white" {}
[MainColor] _BaseColor("Base Color", Color) = (1, 1, 1, 1)
_Cutoff("Alpha Clipping", Range(0.0, 1.0)) = 0.5
_Smoothness("Smoothness", Range(0.0, 1.0)) = 0.5
_SpecColor("Specular Color", Color) = (0.5, 0.5, 0.5, 0.5)
_SpecGlossMap("Specular Map", 2D) = "white" {}
_SmoothnessSource("Smoothness Source", Float) = 0.0
_SpecularHighlights("Specular Highlights", Float) = 1.0
[HideInInspector] _BumpScale("Scale", Float) = 1.0
[NoScaleOffset] _BumpMap("Normal Map", 2D) = "bump" {}
[HDR] _EmissionColor("Emission Color", Color) = (0,0,0)
[NoScaleOffset]_EmissionMap("Emission Map", 2D) = "white" {}
// Blending state
_Surface("__surface", Float) = 0.0
_Blend("__blend", Float) = 0.0
_Cull("__cull", Float) = 2.0
[ToggleUI] _AlphaClip("__clip", Float) = 0.0
[HideInInspector] _SrcBlend("__src", Float) = 1.0
[HideInInspector] _DstBlend("__dst", Float) = 0.0
[HideInInspector] _SrcBlendAlpha("__srcA", Float) = 1.0
[HideInInspector] _DstBlendAlpha("__dstA", Float) = 0.0
[HideInInspector] _ZWrite("__zw", Float) = 1.0
[HideInInspector] _BlendModePreserveSpecular("_BlendModePreserveSpecular", Float) = 1.0
[HideInInspector] _AlphaToMask("__alphaToMask", Float) = 0.0
[ToggleUI] _ReceiveShadows("Receive Shadows", Float) = 1.0
// Editmode props
_QueueOffset("Queue offset", Float) = 0.0
// ObsoleteProperties
[HideInInspector] _MainTex("BaseMap", 2D) = "white" {}
[HideInInspector] _Color("Base Color", Color) = (1, 1, 1, 1)
[HideInInspector] _Shininess("Smoothness", Float) = 0.0
[HideInInspector] _GlossinessSource("GlossinessSource", Float) = 0.0
[HideInInspector] _SpecSource("SpecularHighlights", Float) = 0.0
[HideInInspector][NoScaleOffset]unity_Lightmaps("unity_Lightmaps", 2DArray) = "" {}
[HideInInspector][NoScaleOffset]unity_LightmapsInd("unity_LightmapsInd", 2DArray) = "" {}
[HideInInspector][NoScaleOffset]unity_ShadowMasks("unity_ShadowMasks", 2DArray) = "" {}
}
SubShader
{
Tags
{
"RenderType" = "Opaque"
"RenderPipeline" = "UniversalPipeline"
"UniversalMaterialType" = "SimpleLit"
"IgnoreProjector" = "True"
}
LOD 300
//ForwardLit
Pass
{
Name "ForwardLit"
Tags
{
"LightMode" = "UniversalForward"
}
// -------------------------------------
// Render State Commands
// Use same blending / depth states as Standard shader
Blend[_SrcBlend][_DstBlend], [_SrcBlendAlpha][_DstBlendAlpha]
ZWrite[_ZWrite]
Cull[_Cull]
AlphaToMask[_AlphaToMask]
HLSLPROGRAM
#pragma target 2.0
// -------------------------------------
// Shader Stages
#pragma vertex LitPassVertexSimple
#pragma fragment LitPassFragmentSimple
// -------------------------------------
// Material Keywords
#pragma shader_feature_local _NORMALMAP
#pragma shader_feature_local_fragment _EMISSION
#pragma shader_feature_local _RECEIVE_SHADOWS_OFF
#pragma shader_feature_local_fragment _SURFACE_TYPE_TRANSPARENT
#pragma shader_feature_local_fragment _ALPHATEST_ON
#pragma shader_feature_local_fragment _ _ALPHAPREMULTIPLY_ON _ALPHAMODULATE_ON
#pragma shader_feature_local_fragment _ _SPECGLOSSMAP _SPECULAR_COLOR
#pragma shader_feature_local_fragment _GLOSSINESS_FROM_BASE_ALPHA
// -------------------------------------
// Universal Pipeline keywords
#pragma multi_compile _ _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN
#pragma multi_compile _ _ADDITIONAL_LIGHTS_VERTEX _ADDITIONAL_LIGHTS
#pragma multi_compile _ EVALUATE_SH_MIXED EVALUATE_SH_VERTEX
#pragma multi_compile _ LIGHTMAP_SHADOW_MIXING
#pragma multi_compile _ SHADOWS_SHADOWMASK
#pragma multi_compile _ _LIGHT_LAYERS
#pragma multi_compile _ _FORWARD_PLUS
#pragma multi_compile_fragment _ _ADDITIONAL_LIGHT_SHADOWS
#pragma multi_compile_fragment _ _SHADOWS_SOFT
#pragma multi_compile_fragment _ _SHADOWS_SOFT_LOW _SHADOWS_SOFT_MEDIUM _SHADOWS_SOFT_HIGH
#pragma multi_compile_fragment _ _SCREEN_SPACE_OCCLUSION
#pragma multi_compile_fragment _ _DBUFFER_MRT1 _DBUFFER_MRT2 _DBUFFER_MRT3
#pragma multi_compile_fragment _ _LIGHT_COOKIES
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/RenderingLayers.hlsl"
// -------------------------------------
// Unity defined keywords
#pragma multi_compile _ DIRLIGHTMAP_COMBINED
#pragma multi_compile _ LIGHTMAP_ON
#pragma multi_compile _ DYNAMICLIGHTMAP_ON
#pragma multi_compile_fog
#pragma multi_compile_fragment _ DEBUG_DISPLAY
#pragma multi_compile_fragment _ LOD_FADE_CROSSFADE
//--------------------------------------
// GPU Instancing
#pragma multi_compile_instancing
#pragma instancing_options renderinglayer
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DOTS.hlsl"
//--------------------------------------
// Defines
#define BUMP_SCALE_NOT_SUPPORTED 1
// -------------------------------------
// Includes
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitInput.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitForwardPass.hlsl"
ENDHLSL
}
//ShadowCaster
Pass
{
Name "ShadowCaster"
Tags
{
"LightMode" = "ShadowCaster"
}
// -------------------------------------
// Render State Commands
ZWrite On
ZTest LEqual
ColorMask 0
Cull[_Cull]
HLSLPROGRAM
#pragma target 2.0
// -------------------------------------
// Shader Stages
#pragma vertex ShadowPassVertex
#pragma fragment ShadowPassFragment
// -------------------------------------
// Material Keywords
#pragma shader_feature_local_fragment _ALPHATEST_ON
#pragma shader_feature_local_fragment _GLOSSINESS_FROM_BASE_ALPHA
// -------------------------------------
// Unity defined keywords
#pragma multi_compile_fragment _ LOD_FADE_CROSSFADE
//--------------------------------------
// GPU Instancing
#pragma multi_compile_instancing
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DOTS.hlsl"
// This is used during shadow map generation to differentiate between directional and punctual light shadows, as they use different formulas to apply Normal Bias
#pragma multi_compile_vertex _ _CASTING_PUNCTUAL_LIGHT_SHADOW
// -------------------------------------
// Includes
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitInput.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/ShadowCasterPass.hlsl"
ENDHLSL
}
//GBuffer
Pass
{
Name "GBuffer"
Tags
{
"LightMode" = "UniversalGBuffer"
}
// -------------------------------------
// Render State Commands
ZWrite[_ZWrite]
ZTest LEqual
Cull[_Cull]
HLSLPROGRAM
#pragma target 4.5
// Deferred Rendering Path does not support the OpenGL-based graphics API:
// Desktop OpenGL, OpenGL ES 3.0, WebGL 2.0.
#pragma exclude_renderers gles3 glcore
// -------------------------------------
// Shader Stages
#pragma vertex LitPassVertexSimple
#pragma fragment LitPassFragmentSimple
// -------------------------------------
// Material Keywords
#pragma shader_feature_local_fragment _ALPHATEST_ON
//#pragma shader_feature _ALPHAPREMULTIPLY_ON
#pragma shader_feature_local_fragment _ _SPECGLOSSMAP _SPECULAR_COLOR
#pragma shader_feature_local_fragment _GLOSSINESS_FROM_BASE_ALPHA
#pragma shader_feature_local _NORMALMAP
#pragma shader_feature_local_fragment _EMISSION
#pragma shader_feature_local _RECEIVE_SHADOWS_OFF
// -------------------------------------
// Universal Pipeline keywords
#pragma multi_compile _ _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN
//#pragma multi_compile _ _ADDITIONAL_LIGHTS_VERTEX _ADDITIONAL_LIGHTS
//#pragma multi_compile _ _ADDITIONAL_LIGHT_SHADOWS
#pragma multi_compile_fragment _ _SHADOWS_SOFT
#pragma multi_compile_fragment _ _SHADOWS_SOFT_LOW _SHADOWS_SOFT_MEDIUM _SHADOWS_SOFT_HIGH
#pragma multi_compile_fragment _ _DBUFFER_MRT1 _DBUFFER_MRT2 _DBUFFER_MRT3
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/RenderingLayers.hlsl"
// -------------------------------------
// Unity defined keywords
#pragma multi_compile _ DIRLIGHTMAP_COMBINED
#pragma multi_compile _ LIGHTMAP_ON
#pragma multi_compile _ DYNAMICLIGHTMAP_ON
#pragma multi_compile _ LIGHTMAP_SHADOW_MIXING
#pragma multi_compile _ SHADOWS_SHADOWMASK
#pragma multi_compile_fragment _ _GBUFFER_NORMALS_OCT
#pragma multi_compile_fragment _ _RENDER_PASS_ENABLED
#pragma multi_compile_fragment _ LOD_FADE_CROSSFADE
//--------------------------------------
// GPU Instancing
#pragma multi_compile_instancing
#pragma instancing_options renderinglayer
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DOTS.hlsl"
//--------------------------------------
// Defines
#define BUMP_SCALE_NOT_SUPPORTED 1
// -------------------------------------
// Includes
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitInput.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitGBufferPass.hlsl"
ENDHLSL
}
//DepthOnly
Pass
{
Name "DepthOnly"
Tags
{
"LightMode" = "DepthOnly"
}
// -------------------------------------
// Render State Commands
ZWrite On
ColorMask R
Cull[_Cull]
HLSLPROGRAM
#pragma target 2.0
// -------------------------------------
// Shader Stages
#pragma vertex DepthOnlyVertex
#pragma fragment DepthOnlyFragment
// -------------------------------------
// Material Keywords
#pragma shader_feature_local_fragment _ALPHATEST_ON
#pragma shader_feature_local_fragment _GLOSSINESS_FROM_BASE_ALPHA
// -------------------------------------
// Unity defined keywords
#pragma multi_compile_fragment _ LOD_FADE_CROSSFADE
//--------------------------------------
// GPU Instancing
#pragma multi_compile_instancing
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DOTS.hlsl"
// -------------------------------------
// Includes
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitInput.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/DepthOnlyPass.hlsl"
ENDHLSL
}
// This pass is used when drawing to a _CameraNormalsTexture texture
Pass
{
Name "DepthNormals"
Tags
{
"LightMode" = "DepthNormals"
}
// -------------------------------------
// Render State Commands
ZWrite On
Cull[_Cull]
HLSLPROGRAM
#pragma target 2.0
// -------------------------------------
// Shader Stages
#pragma vertex DepthNormalsVertex
#pragma fragment DepthNormalsFragment
// -------------------------------------
// Material Keywords
#pragma shader_feature_local _NORMALMAP
#pragma shader_feature_local_fragment _ALPHATEST_ON
#pragma shader_feature_local_fragment _GLOSSINESS_FROM_BASE_ALPHA
// -------------------------------------
// Unity defined keywords
#pragma multi_compile_fragment _ LOD_FADE_CROSSFADE
// Universal Pipeline keywords
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/RenderingLayers.hlsl"
//--------------------------------------
// GPU Instancing
#pragma multi_compile_instancing
#include_with_pragmas "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DOTS.hlsl"
// -------------------------------------
// Includes
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitInput.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitDepthNormalsPass.hlsl"
ENDHLSL
}
// This pass it not used during regular rendering, only for lightmap baking.
Pass
{
Name "Meta"
Tags
{
"LightMode" = "Meta"
}
// -------------------------------------
// Render State Commands
Cull Off
HLSLPROGRAM
#pragma target 2.0
// -------------------------------------
// Shader Stages
#pragma vertex UniversalVertexMeta
#pragma fragment UniversalFragmentMetaSimple
// -------------------------------------
// Material Keywords
#pragma shader_feature_local_fragment _EMISSION
#pragma shader_feature_local_fragment _SPECGLOSSMAP
#pragma shader_feature EDITOR_VISUALIZATION
// -------------------------------------
// Includes
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitInput.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitMetaPass.hlsl"
ENDHLSL
}
//Universal2D
Pass
{
Name "Universal2D"
Tags
{
"LightMode" = "Universal2D"
"RenderType" = "Transparent"
"Queue" = "Transparent"
}
HLSLPROGRAM
#pragma target 2.0
// -------------------------------------
// Shader Stages
#pragma vertex vert
#pragma fragment frag
// -------------------------------------
// Material Keywords
#pragma shader_feature_local_fragment _ALPHATEST_ON
#pragma shader_feature_local_fragment _ALPHAPREMULTIPLY_ON
// -------------------------------------
// Includes
#include "Packages/com.unity.render-pipelines.universal/Shaders/SimpleLitInput.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/Utils/Universal2D.hlsl"
ENDHLSL
}
}
Fallback "Hidden/Universal Render Pipeline/FallbackError"
CustomEditor "UnityEditor.Rendering.Universal.ShaderGUI.SimpleLitShader"
}
