需要做的准备
首先肯定是需要安装Unity,我这里选择的版本是Unity version :2018.3.7f1。学习任何事物都离不开趁手的工具,Shader也不例外。我们可以选择Sublime Text,JB Rider Free For Student,甚至VS作为我们的编辑器,但试用之后还是觉得VSCode是比较优的选择。下面我们将基于VSCode搭建一个Shaderlab编辑器。(编辑器不带调试功能,我们仍需要借助Unity进行调试。)
首先我们直接从VSCode官网下载VSCode Free ver。打开VSCode,选择Extensions–Search “Shaderlab”–Install “ShaderlabVSCode”。
接着我们配置Shaderlab的json文件。上方菜单:File–Preferences–User Snippets–Search “shaderlab”–选择shader.json进入。
// Place your snippets for shaderlab here. Each snippet is defined under a snippet name and has a prefix, body and
// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the
// same ids are connected.
// Example:
// "Print to console": {
// "prefix": "log",
// "body": [
// "console.log('$1');",
// "$2"
// ],
// "description": "Log output to console"
// }
我们可以看到如上的文档说明,大意是:
在这里你可以定制你的shaderlab语法模板。用 {} 包围整个代码块,每一个模板用 , 分隔开。
对于每一个模板,内部每一个属性也用 , 分隔开。首先为模板起一个名字,对应 “Print to console” ,接着我们声明它的 prefix 属性,这是用于匹配你的模板的检索标志,对应 “log” ,即我们输入log时,匹配栏会出现这个模板。
接着编辑 “body” 部分,这是模板的内容,格式为[“string”,],在[]内部,每一个字符串自成一行,可以用转义字符实现缩进换行,若想实现高级定制,则可插入 ${number:hint} 对于每一个 $ ,会按照 number 从小到大的顺序,给出 hint 提示补全模板,使用 Tab 切换至下一个可编辑的单元,最终光标会停留在 $0 处。
基于这些,我们便可以灵活的配置自己所需的模板。下面也给出一份我自己常用的模板配置,这份模板也会不定期更新。
{
"Shaderlab": {
"prefix": "shaderlab",
"body": [
"Shader \"${1:Shader Name}\" {\n",
"\tProperties {",
"\t\t_MainTex (\"Base (RGB)\", 2D) = \"white\" {}",
"\t\t_Color (\"Color\", Color) = (1, 1, 1, 1)",
"\t}\n",
"\tSubShader {",
"\t\tCGINCLUDE",
"\t\t#include \"UnityCG.cginc\"\n",
"\t\tsampler2D _MainTex;",
"\t\tfloat4 _MainTex_ST;\n",
"\t\tstruct a2v {",
"\t\t\tfloat4 vertex : POSITION;",
"\t\t\tfloat2 texcoord : TEXCOORD0;",
"\t\t};\n",
"\t\tstruct v2f {",
"\t\t\tfloat4 pos : SV_POSITION;",
"\t\t\tfloat2 uv : TEXCOORD0;",
"\t\t};\n",
"\t\tv2f vert(a2v v) {",
"\t\t\tv2f o;",
"\t\t\to.pos = UnityObjectToClipPos(v.vertex);",
"\t\t\to.uv = TRANSFORM_TEX(v.texcoord, _MainTex);",
"\t\t\treturn o;",
"\t\t}\n",
"\t\tfixed4 frag(v2f i) : SV_Target {",
"\t\t\tfixed4 color;",
"\t\t\tcolor = tex2D(_MainTex, i.uv);",
"\t\t\treturn color;",
"\t\t}",
"\t\tENDCG\n",
"\t\tPass {\n",
"\t\t\tCGPROGRAM",
"\t\t\t#pragma vertex vert",
"\t\t\t#pragma fragment frag",
"\t\t\tENDCG",
"\t\t}",
"\t}\n",
"\tFallBack \"Diffuse\"",
"}"
],
"description": "Shaderlab Template"
},
"Range()": {
"prefix": "range",
"body": [
"Range(${1:left}, ${2:right})"
],
"description": "Range for properties"
},
"Pass": {
"prefix": "pass",
"body": [
"Pass {",
"\t$0",
"}"
],
"description": "Pass for Shaderlab Subshader"
},
"Tags": {
"prefix": "tags",
"body": [
"Tags {",
"\t$0",
"}"
],
"description": "Tags in Pass"
}
}