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/* 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, 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 front.waitForFrame();
yield ensurePixelIs(front, { x: 0, y: 0 }, { r: 0, g: 0, b: 255, a: 255 }, true);
yield ensurePixelIs(front, { x: 128, y: 128 }, { r: 0, g: 0, b: 255, a: 255 }, true);
yield ensurePixelIs(front, { 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.includes("vFragmentColor = vec3(0, 0, 1);"),
"The vertex shader source is correct after changing it.");
ok(fragSource.includes("gl_FragColor = vec4(vFragmentColor, 1.0);"),
"The fragment shader source is correct after changing the vertex shader.");
yield removeTab(target.tab);
finish();
}
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