<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL FRAMEBUFFER_UNSUPPORTED Test</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>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<canvas id="canvas" width="2" height="2"> </canvas>

<script>
"use strict";
var wtu = WebGLTestUtils;
var gl;
var canvas = document.getElementById("canvas");

function checkFramebuffer(expected) {
    var actual = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
    if (expected.indexOf(actual) < 0) {
        var msg = "checkFramebufferStatus expects [";
        for (var index = 0; index < expected.length; ++index) {
            msg += wtu.glEnumToString(gl, expected[index]);
            if (index + 1 < expected.length)
                msg += ", ";
        }
        msg += "], was " + wtu.glEnumToString(gl, actual);
        testFailed(msg);
    } else {
        var msg = "checkFramebufferStatus got " + wtu.glEnumToString(gl, actual) +
                  " as expected";
        testPassed(msg);
    }
}

function testImageAttachedTwoPoints() {
    debug("");
    debug("Checking an image is attached to more than one color attachment in a framebuffer.");

    var tex1 = gl.createTexture();
    var tex2 = gl.createTexture();
    var fb = gl.createFramebuffer();
    gl.bindTexture(gl.TEXTURE_2D, tex1);
    gl.texImage2D(gl.TEXTURE_2D,
                  0,                                          // level
                  gl.RGBA,                                    // internalFormat
                  1,                                          // width
                  1,                                          // height
                  0,                                          // border
                  gl.RGBA,                                    // format
                  gl.UNSIGNED_BYTE,                           // type
                  new Uint8Array(4));                         // data
    gl.bindTexture(gl.TEXTURE_2D, tex2);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(4));
    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Texture creation should succeed.");

    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex1, 0);
    checkFramebuffer([gl.FRAMEBUFFER_COMPLETE]);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.TEXTURE_2D, tex2, 0);
    checkFramebuffer([gl.FRAMEBUFFER_COMPLETE]);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT2, gl.TEXTURE_2D, tex1, 0);
    checkFramebuffer([gl.FRAMEBUFFER_UNSUPPORTED]);

    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
    gl.deleteFramebuffer(fb);
    fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    var texCube = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_CUBE_MAP, texCube);
    for (var target = gl.TEXTURE_CUBE_MAP_POSITIVE_X; target < gl.TEXTURE_CUBE_MAP_POSITIVE_X + 6; target++) {
      gl.texImage2D(target, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(4));
    }
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_CUBE_MAP_POSITIVE_X, texCube, 0);
    checkFramebuffer([gl.FRAMEBUFFER_COMPLETE]);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.TEXTURE_CUBE_MAP_POSITIVE_Y, texCube, 0);
    checkFramebuffer([gl.FRAMEBUFFER_COMPLETE]);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT2, gl.TEXTURE_CUBE_MAP_POSITIVE_X, texCube, 0);
    checkFramebuffer([gl.FRAMEBUFFER_UNSUPPORTED]);


    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
    gl.deleteFramebuffer(fb);
    fb = gl.createFramebuffer();
    gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
    var tex3d = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_3D, tex3d);
    gl.texImage3D(gl.TEXTURE_3D,
                  0,                                          // level
                  gl.RGBA,                                    // internalFormat
                  2,                                          // width
                  2,                                          // height
                  2,                                          // depth
                  0,                                          // border
                  gl.RGBA,                                    // format
                  gl.UNSIGNED_BYTE,                           // type
                  new Uint8Array(4 * 2 * 2 * 2));             // data
    gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, tex3d, 0, 0);
    checkFramebuffer([gl.FRAMEBUFFER_COMPLETE]);
    gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, tex3d, 0, 1);
    checkFramebuffer([gl.FRAMEBUFFER_COMPLETE]);
    gl.framebufferTextureLayer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT2, tex3d, 0, 0);
    checkFramebuffer([gl.FRAMEBUFFER_UNSUPPORTED]);

    // Clean up
    gl.deleteTexture(tex1);
    gl.deleteTexture(tex2);
    gl.deleteTexture(texCube);
    gl.deleteTexture(tex3d);
    gl.deleteFramebuffer(fb);
}

description("This tests FRAMEBUFFER_UNSUPPORTED.");

shouldBeNonNull("gl = wtu.create3DContext(undefined, undefined, 2)");

testImageAttachedTwoPoints();

debug("");
var successfullyParsed = true;
</script>
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