我正在尝试设置WebGL + TypeScript的基本演示,在屏幕上呈现一个简单的矩形,并针对纵横比进行调整。
我正在尝试使用 gl-矩阵来计算模型-视图-投影矩阵,并将其作为统一上传。当我尝试这样做时,我收到一条很长的错误消息,指出我的矩阵和 Float32Array 的类型不兼容。奇怪的部分是:当我控制台.log(矩阵(时,它以 Float32Array 类型打印到控制台,具有正确的值。这是怎么回事?
// GLM here stands for glMatrix
let aspect_ratio = canvas.width / canvas.height;
let projection = GLM.mat4.ortho(GLM.mat4.create(),
-aspect_ratio, // left
aspect_ratio, // right
-1.0, // bottom
1.0, // top
-1.0, // near
1.0); // far
let view = GLM.mat4.lookAt(GLM.mat4.create(),
GLM.vec3.fromValues(0,0,0), // eye
GLM.vec3.fromValues(0,0,0), // camera position
GLM.vec3.fromValues(0,1,0)); // world up
let model = GLM.mat4.create();
model = GLM.mat4.translate(model, model, GLM.vec3.fromValues(0.5, 0.5, 0.0));
let mvp = GLM.mat4.create();
mvp = GLM.mat4.multiply(mvp, projection, view); // first, multiply projection by view
mvp = GLM.mat4.multiply(mvp, mvp, model); // then the result by model
// because the calculation is projection * view * model
console.log(mvp); // prints: Float32Array(16) [0.75, 0, 0 .... correct values ]
console.log(typeof(mvp)) // prints: object - what's up with that?
// ... during my main loop
gl.useProgram(shaderProgram);
gl.uniformMatrix4fv(mvp_uniform_location, false, mvp); // Type error!
我之前在导入库时遇到了一些麻烦,所以我求助于直接从node_modules文件夹中导入它。我已经安装了 DefinitelyTyped gl-matrix 包,但由于我导入库的方式,我实际上并没有使用它。一旦我更改了我的导入
import * as GLM from './../node_modules/gl-matrix/gl-matrix'
自
import * as GLM from 'gl-matrix'
一切都开始工作了。