初始化

vendor/tinyh264/ShaderCompiler.ts

@@ -0,0 +1,39 @@
+/**
+ * Represents a WebGL shader object and provides a mechanism to load shaders from HTML
+ * script tags.
+ */
+
+export default class ShaderCompiler {
+    /**
+     * @param {WebGLRenderingContext}gl
+     * @param {{type: string, source: string}}script
+     * @return {WebGLShader}
+     */
+    static compile(gl: WebGLRenderingContext, script: { type: string; source: string }): WebGLShader | null {
+        let shader: WebGLShader | null;
+        // Now figure out what type of shader script we have, based on its MIME type.
+        if (script.type === 'x-shader/x-fragment') {
+            shader = gl.createShader(gl.FRAGMENT_SHADER);
+        } else if (script.type === 'x-shader/x-vertex') {
+            shader = gl.createShader(gl.VERTEX_SHADER);
+        } else {
+            throw new Error('Unknown shader type: ' + script.type);
+        }
+        if (!shader) {
+            throw new Error('Failed to create shader');
+        }
+
+        // Send the source to the shader object.
+        gl.shaderSource(shader, script.source);
+
+        // Compile the shader program.
+        gl.compileShader(shader);
+
+        // See if it compiled successfully.
+        if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
+            throw new Error('An error occurred compiling the shaders: ' + gl.getShaderInfoLog(shader));
+        }
+
+        return shader;
+    }
+}