【Shader】应用 ShaderToy 代码的 ShaderLab 模板

来源：互联网发布：中国国库有多少钱知乎编辑：程序博客网时间：2024/06/06 12:43

参考自：冯乐乐的博客 http://blog.csdn.net/candycat1992/article/details/44039077

（1）CG 头文件 ShaderToyDefines.cginc

/* ------------------------ Shader Toy 着色器输入 -----------------------------------uniform vec3      iResolution;           // viewport resolution (in pixels)uniform float     iGlobalTime;           // shader playback time (in seconds)uniform float     iTimeDelta;            // render time (in seconds)uniform int       iFrame;                // shader playback frameuniform float     iChannelTime[4];       // channel playback time (in seconds)uniform vec3      iChannelResolution[4]; // channel resolution (in pixels)uniform vec4      iMouse;                // mouse pixel coords. xy: current (if MLB down), zw: clickuniform samplerXX iChannel0..3;          // input channel. XX = 2D/Cubeuniform vec4      iDate;                 // (year, month, day, time in seconds)uniform float     iSampleRate;           // sound sample rate (i.e., 44100)-------------------------------------------------------------------------------------*/// 定义一系列宏和 Shader Toy 中的 GLSL 衔接#define vec2 float2#define vec3 float3#define vec4 float4#define mat2 float2x2#define mat3 float3x3#define mat4 float4x4#define iGlobalTime _Time.y#define mod fmod#define mix lerp#define fract frac#define texture2D tex2D#define iResolution _ScreenParams#define gl_FragCoord ((_iParam.scrPos.xy / _iParam.scrPos.w) * _ScreenParams.xy)#define PI2 6.28318530718#define pi 3.14159265358979#define halfpi (pi * 0.5)#define oneoverpi (1.0 / pi)

（1）Shader 文件如下：

Shader "Shader/Template" {    Properties {    }    CGINCLUDE    #include "UnityCG.cginc"    #include "ShaderToyDefines.cginc"    #pragma target 3.0    // Properties    struct v2f {        float4 pos : SV_POSITION;        float4 scrPos : TEXCOORD0;    };    v2f vert(appdata_base v) {        v2f o;        o.pos = mul (UNITY_MATRIX_MVP, v.vertex);        o.scrPos = ComputeScreenPos(o.pos);        return o;    }    vec4 main(vec2 fragCoord);    fixed4 frag(v2f _iParam) : COLOR0 {        return main(gl_FragCoord);    }    // 函数 main 对应了 ShaderToy 的 mainImage 函数    vec4 main(vec2 fragCoord) {        return vec4(1, 1, 1, 1);    }    ENDCG    SubShader {        Pass {            CGPROGRAM            #pragma vertex vert            #pragma fragment frag            #pragma fragmentoption ARB_precision_hint_fastest            ENDCG        }    }    FallBack Off}

（2）如果要使用到鼠标点击行为，使用的脚本

using UnityEngine;using System.Collections;/// <summary>/// 把该脚本拖拽到材质所在的物体上，同时保证该物体上绑定了 Collider /// </summary>public class ShaderToyHelper : MonoBehaviour{    private Material _material = null;    private bool _isDragging = false;    void Start()    {        Renderer render = GetComponent<Renderer>();        if (render != null)            _material = render.material;        _isDragging = false;    }    void Update()    {        Vector3 mousePosition = Vector3.zero;        // 在有鼠标拖拽时，mousePosition 的 Z 分量为 1， 否则为 0，与 ShaderToy 中判断鼠标的方式一致        if (_isDragging)            mousePosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 1.0f);        else            mousePosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, 0.0f);        if (_material != null)            _material.SetVector("iMouse", mousePosition);    }    void OnMouseDown() {        _isDragging = true;    }    void OnMouseUp() {        _isDragging = false;    }}

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