add camera

src/camera.ts

@@ -0,0 +1,31 @@
+import {mat4, vec3, quat, mat3} from "gl-matrix";
+
+export class Camera{
+    pos:vec3;
+    rot:quat;
+    constructor(pos:vec3,rot?:quat){
+        this.pos = pos;
+        if(rot == undefined){
+            const lookAt = mat4.lookAt(mat4.create(),this.pos,[0,0,0],[0,0,1])
+            const rotMat = mat3.fromMat4(mat3.create(),lookAt);
+            this.rot = quat.fromMat3(quat.create(), rotMat);
+        }
+        else{
+            this.rot = rot;
+        }
+    }
+    rotateRight(rad:number){
+        quat.rotateY(this.rot,this.rot,rad);
+    }
+    rotateUp(rad:number){
+        quat.rotateX(this.rot,this.rot,rad);
+    }
+    rotateClockwise(rad:number){
+        quat.rotateZ(this.rot,this.rot,rad);
+    }
+    getViewMat(){
+        const r = mat4.fromQuat(mat4.create(),this.rot);
+        mat4.translate(r,r,this.pos);
+        return r;
+    }
+};