47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
import { mat4 } from 'glm';
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export class Camera {
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constructor({
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orthographic = 0,
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aspect = 1,
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fovy = 1,
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halfy = 1,
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near = 0.01,
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far = 1000,
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} = {}) {
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this.orthographic = orthographic;
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this.aspect = aspect;
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this.fovy = fovy;
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this.halfy = halfy;
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this.near = near;
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this.far = far;
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}
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get projectionMatrix() {
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if (this.orthographic === 0) {
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return this.perspectiveMatrix;
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} else if (this.orthographic === 1) {
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return this.orthographicMatrix;
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} else {
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const a = this.orthographicMatrix;
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const b = this.perspectiveMatrix;
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return mat4.add(mat4.create(),
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mat4.multiplyScalar(a, a, this.orthographic),
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mat4.multiplyScalar(b, b, 1 - this.orthographic));
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}
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}
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get orthographicMatrix() {
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const { halfy, aspect, near, far } = this;
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const halfx = halfy * aspect;
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return mat4.orthoZO(mat4.create(), -halfx, halfx, -halfy, halfy, near, far);
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}
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get perspectiveMatrix() {
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const { fovy, aspect, near, far } = this;
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return mat4.perspectiveZO(mat4.create(), fovy, aspect, near, far);
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}
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}
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