文章目录
- 前言
- 一、性能优化
-
- 1、尽可能减少纹理采样次数
- [2、 尽量把 max函数 换成 saturate函数,可以减少一次GPU指令](#2、 尽量把 max函数 换成 saturate函数,可以减少一次GPU指令)
- 3、尽可能的把计算移到顶点着色器
- 4、变体优化
- [5、变量放入 常量缓冲区](#5、变量放入 常量缓冲区)
- [二、BuideIn Render Pipeline适配](#二、BuideIn Render Pipeline适配)
- 三、最终效果和代码
前言
在之前的文章中,我们实现了URP下的能量罩效果。
我们在这篇文章中,对其进行性能优化 和 BRP下的适配。
一、性能优化
1、尽可能减少纹理采样次数
- 我们这里把 能量罩花纹纹理 和 抓屏扭曲纹理 合并成同一个来使用,在效果上没多大变化。但是,可以少使用一次纹理采样。
2、 尽量把 max函数 换成 saturate函数,可以减少一次GPU指令
3、尽可能的把计算移到顶点着色器
- 在片元着色器中计算,需要对片元中的每一个像素进行计算,消耗性能较大
4、变体优化
5、变量放入 常量缓冲区
二、BuideIn Render Pipeline适配
1、C#脚本开启摄像机深度图
Camera.main.depthTextureMode = DepthTextureMode.Depth;
2、CG语言适配
- 抓屏纹理
GrabPass{"_GrabPass"}
- 引入库修改
#include "UnityCG.cginc"
- 纹理申明
sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _CameraDepthTexture;
sampler2D _GrabPass;
- 顶点着色器中,顶点坐标系变换需要修改为BRP的方法
v2f vert(appdata v)
{
v2f o = (v2f)0;
o.positionWS = mul(unity_ObjectToWorld,v.positionOS);
o.positionVS = UnityObjectToViewPos(v.positionOS);
o.positionCS = UnityObjectToClipPos(v.positionOS);
o.normalWS = UnityObjectToWorldNormal(v.normalOS);
o.uv.xy = v.uv;
o.uv.zw = TRANSFORM_TEX(v.uv,_MainTex);
return o;
}
- 纹理采样使用 tex2D
三、最终效果和代码
//流光扭曲花纹
Shader "MyShader/URP/P4_3_7"
{
Properties
{
[Header(MainTex)]
_MainTex("MainTex",2D) = "white"{}
[Header(HighLight)]
_HighLightColor("HighLightColor",Color) = (0,0,0,0)
_HighLightFade("HighLightFade",Float) = 1.0
[Header(Fresnel)]
[PowerSlider(3)]_FresnelIntensity("FresnelIntensity",Range(0,15)) = 1.0
_FresnelColor("FresnelColor",Color) = (0,0,0,0)
[Header(Distort)]
_Tilling("Distort Tilling",Float)=0
_Distort("Distort",Range(0,1)) = 0.3
}
SubShader
{
Tags
{
//告诉引擎,该Shader只用于 URP 渲染管线
"RenderPipeline"="UniversalPipeline"
//渲染类型
"RenderType"="Transparent"
//渲染队列
"Queue"="Transparent"
}
Pass
{
Blend One One
ZWrite Off
Name "Unlit"
HLSLPROGRAM
#pragma vertex vert
#pragma fragment frag
// Pragmas
#pragma target 2.0
// Includes
#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Input.hlsl"
CBUFFER_START(UnityPerMaterial)
half4 _HighLightColor;
half _HighLightFade;
half _FresnelIntensity;
half4 _FresnelColor;
half _Tilling;
half _Distort;
float4 _MainTex_ST;
CBUFFER_END
TEXTURE2D(_MainTex);
SAMPLER(sampler_MainTex);
TEXTURE2D(_CameraDepthTexture);
SAMPLER(sampler_CameraDepthTexture);
TEXTURE2D(_CameraOpaqueTexture);
SAMPLER(sampler_CameraOpaqueTexture);
//struct appdata
//顶点着色器的输入
struct Attributes
{
float3 positionOS : POSITION;
float2 uv : TEXCOORD0;
half3 normalOS : NORMAL;
};
//struct v2f
//片元着色器的输入
struct Varyings
{
float4 positionCS : SV_POSITION;
float4 uv : TEXCOORD0;
float4 screenPos : TEXCOORD1;
float3 positionWS : TEXCOORD2;
float3 positionVS : TEXCOORD3;
half3 normalWS : TEXCOORD4;
};
//v2f vert(Attributes v)
//顶点着色器
Varyings vert(Attributes v)
{
Varyings o = (Varyings)0;
o.positionWS = TransformObjectToWorld(v.positionOS);
o.positionVS = TransformWorldToView(o.positionWS);
o.positionCS = TransformWViewToHClip(o.positionVS);
o.screenPos = ComputeScreenPos(o.positionCS);
o.normalWS = TransformObjectToWorldNormal(v.normalOS);
o.uv.xy = v.uv;
o.uv.zw = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
//fixed4 frag(v2f i) : SV_TARGET
//片元着色器
half4 frag(Varyings i) : SV_TARGET
{
half4 col = 0;
//深度图
//float2 uv = i.screenPos.xy / i.screenPos.w;
float2 uv = i.positionCS.xy / _ScreenParams.xy;
half4 cameraDepthTex = SAMPLE_TEXTURE2D(_CameraDepthTexture, sampler_CameraDepthTexture, uv);
half depthTex = LinearEyeDepth(cameraDepthTex.r, _ZBufferParams);
half4 highLight = depthTex + i.positionVS.z;
highLight = pow(saturate(highLight), _HighLightFade);
highLight = 1 - highLight;
highLight *= _HighLightColor;
col += saturate(highLight);
//fresnel外发光
//pow(max(0,dot(N,V)),Intensity)
half3 N = i.normalWS;
half3 V = normalize(_WorldSpaceCameraPos - i.positionWS);
half NdotV = dot(N, V);
half4 fresnel = pow(abs(1 - saturate(NdotV)), _FresnelIntensity);
fresnel *= _FresnelColor;
col += fresnel;
//能量罩花纹
float4 mainTex = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv.zw + float2(0,_Time.x));
col += mainTex * 0.1;
//流光
half flowMask = frac(i.uv.y * _Tilling + _Time.y);
col *= flowMask;
//抓屏流光扭曲
float2 distortUV = lerp(uv, mainTex.rr, _Distort);
half4 opaqueTex = SAMPLE_TEXTURE2D(_CameraOpaqueTexture, sampler_CameraOpaqueTexture, distortUV);
half4 distort = opaqueTex;
col *= distort;
return col;
}
ENDHLSL
}
}
SubShader
{
Tags
{
//渲染类型
"RenderType"="Transparent"
//渲染队列
"Queue"="Transparent"
}
GrabPass
{
"_GrabPass"
}
Pass
{
Blend One One
ZWrite Off
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
// Pragmas
#pragma target 2.0
// Includes
#include "UnityCG.cginc"
half4 _HighLightColor;
half _HighLightFade;
half _FresnelIntensity;
half4 _FresnelColor;
half _Tilling;
half _Distort;
sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _CameraDepthTexture;
sampler2D _GrabPass;
struct appdata
{
float3 positionOS : POSITION;
float2 uv : TEXCOORD0;
half3 normalOS : NORMAL;
};
//struct v2f
//片元着色器的输入
struct v2f
{
float4 positionCS : SV_POSITION;
float4 uv : TEXCOORD0;
float3 positionWS : TEXCOORD2;
float3 positionVS : TEXCOORD3;
half3 normalWS : TEXCOORD4;
};
//v2f vert(appdata v)
//顶点着色器
v2f vert(appdata v)
{
v2f o = (v2f)0;
o.positionWS = mul(unity_ObjectToWorld, v.positionOS);
o.positionVS = UnityObjectToViewPos(v.positionOS);
o.positionCS = UnityObjectToClipPos(v.positionOS);
o.normalWS = UnityObjectToWorldNormal(v.normalOS);
o.uv.xy = v.uv;
o.uv.zw = TRANSFORM_TEX(v.uv, _MainTex);
return o;
}
//fixed4 frag(v2f i) : SV_TARGET
//片元着色器
half4 frag(v2f i) : SV_TARGET
{
half4 col = 0;
//深度图
//float2 uv = i.screenPos.xy / i.screenPos.w;
float2 uv = i.positionCS.xy / _ScreenParams.xy;
half4 cameraDepthTex = tex2D(_CameraDepthTexture, uv);
half depthTex = LinearEyeDepth(cameraDepthTex);
half4 highLight = depthTex + i.positionVS.z;
highLight = pow(saturate(highLight), _HighLightFade);
highLight = 1 - highLight;
highLight *= _HighLightColor;
col += saturate(highLight);
//fresnel外发光
//pow(max(0,dot(N,V)),Intensity)
half3 N = i.normalWS;
half3 V = normalize(_WorldSpaceCameraPos - i.positionWS);
half NdotV = dot(N, V);
half4 fresnel = pow(abs(1 - saturate(NdotV)), _FresnelIntensity);
fresnel *= _FresnelColor;
col += fresnel;
//能量罩花纹
float4 mainTex = tex2D(_MainTex, i.uv.zw + float2(0, _Time.x));
col += mainTex * 0.1;
//流光
half flowMask = frac(i.uv.y * _Tilling + _Time.y);
col *= flowMask;
//抓屏流光扭曲
float2 distortUV = lerp(uv, mainTex.rr, _Distort);
half4 opaqueTex = tex2D(_GrabPass, distortUV);
half4 distort = opaqueTex;
col *= distort;
return col;
}
ENDCG
}
}
}