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<title>WebGL OVR_multiview2 Conformance Tests</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
<script src="../../js/tests/ovr_multiview2_util.js"></script>
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<div id="description"></div>
<div id="console"></div>
<script>
"use strict";

let wtu = WebGLTestUtils;
let gl = wtu.create3DContext(null, null, 2);
let ext = null;

function runNonMultiviewShaderTest()
{
    debug("");
    debug("Testing rendering with shaders that don't declare num_views");

    let width = 256;
    let height = 256;
    let depth = 2;  // always supported so no need to query MAX_VIEWS_OVR.

    let testProgram = wtu.setupSimpleColorProgram(gl);
    if (!testProgram) {
        testFailed("Compilation with extension enabled failed.");
        return;
    }

    let colorUniformLocation = gl.getUniformLocation(testProgram, 'u_color');

    let fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    let colorTex = createTextureWithNearestFiltering(gl.TEXTURE_2D_ARRAY);
    gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 1);

    gl.viewport(0, 0, width, height);

    gl.uniform4f(colorUniformLocation, 0.0, 1.0, 0.0, 1.0);
    wtu.drawUnitQuad(gl);
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors from draw when using a non-multiview shader as long as the number of views is 1");

    let readFb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.READ_FRAMEBUFFER, readFb);
    gl.framebufferTextureLayer(gl.READ_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0);
    wtu.checkCanvasRect(gl, 0, 0, width, height, [0, 255, 0, 255], 'view 0 should be green');

    ext.framebufferTextureMultiviewOVR(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, colorTex, 0, 0, 2);
    wtu.drawUnitQuad(gl);
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "draw should generate an INVALID_OPERATION error when using a non-multiview shader and the number of views is > 1");
}

description("This test verifies that non-multiview shaders work correctly with OVR_multiview2 extension, if it is available.");

debug("");

if (!gl) {
  testFailed("WebGL context does not exist");
} else {
  testPassed("WebGL context exists");

  if (!gl.getExtension("OVR_multiview2")) {
      testPassed("No OVR_multiview2 support -- this is legal");
  } else {
      testPassed("Successfully enabled OVR_multiview2 extension");
      ext = gl.getExtension('OVR_multiview2');

      wtu.setupUnitQuad(gl, 0, 1);

      runNonMultiviewShaderTest();
  }
}

debug("");
var successfullyParsed = true;
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