初始化

vendor/tinyh264/ShaderProgram.ts

@@ -0,0 +1,64 @@
+export default class ShaderProgram {
+    public program: WebGLProgram | null;
+    /**
+     * @param {WebGLRenderingContext}gl
+     */
+    constructor(private gl: WebGLRenderingContext) {
+        this.program = this.gl.createProgram();
+    }
+
+    /**
+     * @param {WebGLShader}shader
+     */
+    attach(shader: WebGLShader): void {
+        if (!this.program) {
+            throw Error(`Program type is ${typeof this.program}`);
+        }
+        this.gl.attachShader(this.program, shader);
+    }
+
+    link(): void {
+        if (!this.program) {
+            throw Error(`Program type is ${typeof this.program}`);
+        }
+        this.gl.linkProgram(this.program);
+        // If creating the shader program failed, alert.
+        if (!this.gl.getProgramParameter(this.program, this.gl.LINK_STATUS)) {
+            console.error('Unable to initialize the shader program.');
+        }
+    }
+
+    use(): void {
+        this.gl.useProgram(this.program);
+    }
+
+    /**
+     * @param {string}name
+     * @return {number}
+     */
+    getAttributeLocation(name: string): number {
+        if (!this.program) {
+            throw Error(`Program type is ${typeof this.program}`);
+        }
+        return this.gl.getAttribLocation(this.program, name);
+    }
+
+    /**
+     * @param {string}name
+     * @return {WebGLUniformLocation | null}
+     */
+    getUniformLocation(name: string): WebGLUniformLocation | null {
+        if (!this.program) {
+            throw Error(`Program type is ${typeof this.program}`);
+        }
+        return this.gl.getUniformLocation(this.program, name);
+    }
+
+    /**
+     * @param {WebGLUniformLocation}uniformLocation
+     * @param {Array<number>}array
+     */
+    setUniformM4(uniformLocation: WebGLUniformLocation, array: number[]): void {
+        this.gl.uniformMatrix4fv(uniformLocation, false, array);
+    }
+}