Shaderlab detect shader with duplicate name (#1897)

* fix: detect shaders with duplicate name

packages/core/src/shader/Shader.ts

@@ -89,6 +89,9 @@ export class Shader {
       }
 
       const shaderInfo = Shader._shaderLab.parseShader(nameOrShaderSource);
+      if (shaderMap[shaderInfo.name]) {
+        throw `Shader named "${shaderInfo.name}" already exists.`;
+      }
       const subShaderList = shaderInfo.subShaders.map((subShaderInfo) => {
         const passList = subShaderInfo.passes.map((passInfo) => {
           if (typeof passInfo === "string") {

tests/src/shader-lab/ShaderLab.test.ts

@@ -3,6 +3,7 @@ import { IShaderPassInfo, ISubShaderInfo } from "@galacean/engine-design";
 import { Color } from "@galacean/engine-math";
 import { ShaderLab } from "@galacean/engine-shader-lab";
 import { glslValidate } from "./ShaderValidate";
+import { Shader } from "@galacean/engine-core";
 
 import chai, { expect } from "chai";
 import spies from "chai-spies";
@@ -215,4 +216,11 @@ describe("ShaderLab", () => {
     const demoShader = fs.readFileSync(path.join(__dirname, "shaders/glass.shader")).toString();
     glslValidate(demoShader, shaderLab);
   });
+
+  it("shader with duplicate name", () => {
+    const demoShader = fs.readFileSync(path.join(__dirname, "shaders/glass.shader")).toString();
+    (Shader as any)._shaderLab = shaderLab;
+    expect(Shader.create(demoShader) instanceof Shader).to.be.true;
+    expect(Shader.create.bind(null, demoShader)).to.throw('Shader named "Gem" already exists.');
+  });
 });