/*
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.
*/

function generateTest(internalFormat, pixelFormat, pixelType, prologue, resourcePath, defaultContextVersion) {
    var wtu = WebGLTestUtils;
    var tiu = TexImageUtils;
    var gl = null;
    var successfullyParsed = false;
    var imgCanvas;
    var redColor = [255, 0, 0];
    var greenColor = [0, 255, 0];

    function init()
    {
        description('Verify texImage3D and texSubImage3D code paths taking SVG image elements (' + internalFormat + '/' + pixelFormat + '/' + pixelType + ')');

        // Set the default context version while still allowing the webglVersion URL query string to override it.
        wtu.setDefault3DContextVersion(defaultContextVersion);
        gl = wtu.create3DContext("example");

        if (!prologue(gl)) {
            finishTest();
            return;
        }

        switch (gl[pixelFormat]) {
          case gl.RED:
          case gl.RED_INTEGER:
            greenColor = [0, 0, 0];
            break;
          default:
            break;
        }

        gl.clearColor(0,0,0,1);
        gl.clearDepth(1);

        wtu.loadTexture(gl, resourcePath + "red-green.svg", runTest);
    }

    function runOneIteration(image, flipY, topColor, bottomColor, bindingTarget, program)
    {
        debug('Testing ' + ' with flipY=' + flipY + ' bindingTarget=' +
              (bindingTarget == gl.TEXTURE_3D ? 'TEXTURE_3D' : 'TEXTURE_2D_ARRAY'));
        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
        // Disable any writes to the alpha channel
        gl.colorMask(1, 1, 1, 0);
        var texture = gl.createTexture();
        // Bind the texture to texture unit 0
        gl.bindTexture(bindingTarget, texture);
        // Set up texture parameters
        gl.texParameteri(bindingTarget, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
        gl.texParameteri(bindingTarget, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
        // Set up pixel store parameters
        gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, flipY);
        gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
        wtu.failIfGLError(gl, 'gl.pixelStorei(gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, gl.NONE);');
        // Upload the image into the texture
        // Initialize the texture to black first
        gl.texImage3D(bindingTarget, 0, gl[internalFormat], image.width, image.height, 1 /* depth */, 0,
                      gl[pixelFormat], gl[pixelType], null);
        gl.texSubImage3D(bindingTarget, 0, 0, 0, 0, image.width, image.height, 1 /* depth */,
                         gl[pixelFormat], gl[pixelType], image);

        // Draw the triangles
        wtu.clearAndDrawUnitQuad(gl, [0, 0, 0, 255]);
        // Check a few pixels near the top and bottom and make sure they have
        // the right color.
        debug("Checking lower left corner");
        wtu.checkCanvasRect(gl, 4, 4, 2, 2, bottomColor,
                            "shouldBe " + bottomColor);
        debug("Checking upper left corner");
        wtu.checkCanvasRect(gl, 4, gl.canvas.height - 8, 2, 2, topColor,
                            "shouldBe " + topColor);
    }

    function runTest(image)
    {
        var program = tiu.setupTexturedQuadWith3D(gl, internalFormat);
        runTestOnBindingTarget(image, gl.TEXTURE_3D, program);
        program = tiu.setupTexturedQuadWith2DArray(gl, internalFormat);
        runTestOnBindingTarget(image, gl.TEXTURE_2D_ARRAY, program);

        wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no errors");
        finishTest();
    }

    function runTestOnBindingTarget(image, bindingTarget, program) {
        var cases = [
            { flipY: true, topColor: redColor, bottomColor: greenColor },
            { flipY: false, topColor: greenColor, bottomColor: redColor },
        ];
        for (var i in cases) {
            runOneIteration(image, cases[i].flipY,
                            cases[i].topColor, cases[i].bottomColor,
                            bindingTarget, program);
        }
    }

    return init;
}