The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 /**

  * Tests that the rendering is updated when a varying variable is

  * changed in one shader.

  */

 function ifWebGLSupported() {

   let [target, debuggee, front] = yield initBackend(SIMPLE_CANVAS_URL);

   front.setup({ reload: true });

   let programActor = yield once(front, "program-linked");

   let vertexShader = yield programActor.getVertexShader();

   let fragmentShader = yield programActor.getFragmentShader();

   let oldVertSource = yield vertexShader.getText();

   let newVertSource = oldVertSource.replace("= aVertexColor", "= vec3(0, 0, 1)");

   let status = yield vertexShader.compile(newVertSource);

   ok(!status,

     "The new vertex shader source was compiled without errors.");

   yield waitForFrame(debuggee);

   yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 0, g: 0, b: 255, a: 255 }, true);

   yield ensurePixelIs(debuggee, { x: 128, y: 128 }, { r: 0, g: 0, b: 255, a: 255 }, true);

   yield ensurePixelIs(debuggee, { x: 511, y: 511 }, { r: 0, g: 0, b: 255, a: 255 }, true);

   let vertSource = yield vertexShader.getText();

   let fragSource = yield fragmentShader.getText();

   ok(vertSource.contains("vFragmentColor = vec3(0, 0, 1);"),

     "The vertex shader source is correct after changing it.");

   ok(fragSource.contains("gl_FragColor = vec4(vFragmentColor, 1.0);"),

     "The fragment shader source is correct after changing the vertex shader.");

   yield removeTab(target.tab);

   finish();

 }