michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:    http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: 
michael@0: /**
michael@0:  * Tests that the rendering is updated when a uniform variable is
michael@0:  * changed in one shader of a page with multiple WebGL contexts.
michael@0:  */
michael@0: 
michael@0: function ifWebGLSupported() {
michael@0:   let [target, debuggee, front] = yield initBackend(MULTIPLE_CONTEXTS_URL);
michael@0:   front.setup({ reload: true });
michael@0: 
michael@0:   let [firstProgramActor, secondProgramActor] = yield getPrograms(front, 2);
michael@0: 
michael@0:   let firstFragmentShader = yield firstProgramActor.getFragmentShader();
michael@0:   let secondFragmentShader = yield secondProgramActor.getFragmentShader();
michael@0: 
michael@0:   let oldFragSource = yield firstFragmentShader.getText();
michael@0:   let newFragSource = oldFragSource.replace("vec4(uColor", "vec4(0.25, 0.25, 0.25");
michael@0:   let status = yield firstFragmentShader.compile(newFragSource);
michael@0:   ok(!status,
michael@0:     "The first new fragment shader source was compiled without errors.");
michael@0: 
michael@0:   yield waitForFrame(debuggee);
michael@0:   yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 64, g: 64, b: 64, a: 255 }, true, "#canvas1");
michael@0:   yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 64, g: 64, b: 64, a: 255 }, true, "#canvas1");
michael@0:   yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
michael@0:   yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 0, g: 255, b: 255, a: 255 }, true, "#canvas2");
michael@0:   ok(true, "The first fragment shader was changed.");
michael@0: 
michael@0:   let oldFragSource = yield secondFragmentShader.getText();
michael@0:   let newFragSource = oldFragSource.replace("vec4(uColor", "vec4(0.75, 0.75, 0.75");
michael@0:   let status = yield secondFragmentShader.compile(newFragSource);
michael@0:   ok(!status,
michael@0:     "The second new fragment shader source was compiled without errors.");
michael@0: 
michael@0:   yield waitForFrame(debuggee);
michael@0:   yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 64, g: 64, b: 64, a: 255 }, true, "#canvas1");
michael@0:   yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 64, g: 64, b: 64, a: 255 }, true, "#canvas1");
michael@0:   yield ensurePixelIs(debuggee, { x: 0, y: 0 }, { r: 191, g: 191, b: 191, a: 255 }, true, "#canvas2");
michael@0:   yield ensurePixelIs(debuggee, { x: 127, y: 127 }, { r: 191, g: 191, b: 191, a: 255 }, true, "#canvas2");
michael@0:   ok(true, "The second fragment shader was changed.");
michael@0: 
michael@0:   yield removeTab(target.tab);
michael@0:   finish();
michael@0: }