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-matrix 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,指出我的矩阵类型和 Float32Array 不兼容。这是奇怪的部分:当我使用 console.log(matrix) 时,它以 Float32Array 类型打印到控制台,并带有正确的值。这里发生了什么?
// 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!