1 files changed, 61 insertions, 0 deletions
diff --git a/dom/vr/test/reftest/webgl-util.js b/dom/vr/test/reftest/webgl-util.js
new file mode 100644
index 0000000000..42f1c5ccd5
--- /dev/null
+++ b/dom/vr/test/reftest/webgl-util.js
@@ -0,0 +1,61 @@
+WebGLUtil = (function() {
+  // ---------------------------------------------------------------------------
+  // WebGL helpers
+
+  // Returns a valid shader, or null on errors.
+  function createShaderById(gl, id) {
+    var elem = document.getElementById(id);
+    if (!elem) {
+      throw new Error(
+        "Failed to create shader from non-existent id '" + id + "'."
+      );
+    }
+
+    var src = elem.innerHTML.trim();
+
+    var shader;
+    if (elem.type == "x-shader/x-fragment") {
+      shader = gl.createShader(gl.FRAGMENT_SHADER);
+    } else if (elem.type == "x-shader/x-vertex") {
+      shader = gl.createShader(gl.VERTEX_SHADER);
+    } else {
+      throw new Error(
+        "Bad MIME type for shader '" + id + "': " + elem.type + "."
+      );
+    }
+
+    gl.shaderSource(shader, src);
+    gl.compileShader(shader);
+
+    return shader;
+  }
+
+  function createProgramByIds(gl, vsId, fsId) {
+    var vs = createShaderById(gl, vsId);
+    var fs = createShaderById(gl, fsId);
+    if (!vs || !fs) {
+      return null;
+    }
+
+    var prog = gl.createProgram();
+    gl.attachShader(prog, vs);
+    gl.attachShader(prog, fs);
+    gl.linkProgram(prog);
+
+    if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) {
+      var str = "Shader program linking failed:";
+      str += "\nShader program info log:\n" + gl.getProgramInfoLog(prog);
+      str += "\n\nVert shader log:\n" + gl.getShaderInfoLog(vs);
+      str += "\n\nFrag shader log:\n" + gl.getShaderInfoLog(fs);
+      console.error(str);
+      return null;
+    }
+
+    return prog;
+  }
+
+  return {
+    createShaderById,
+    createProgramByIds,
+  };
+})();