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<title>WebGL EXT_texture_compression_rgtc Conformance Tests</title>
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"use strict";
description("This test verifies the functionality of the EXT_texture_compression_rgtc extension, if it is available.");

debug("");

var validFormats = {
  COMPRESSED_RED_RGTC1_EXT: 0x8DBB,
  COMPRESSED_SIGNED_RED_RGTC1_EXT: 0x8DBC,
  COMPRESSED_RED_GREEN_RGTC2_EXT: 0x8DBD,
  COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT: 0x8DBE
};

function expectedByteLength(width, height, format) {
  if (format == validFormats.COMPRESSED_RED_RGTC1_EXT || format == validFormats.COMPRESSED_SIGNED_RED_RGTC1_EXT) {
    return Math.ceil(width / 4) * Math.ceil(height / 4) * 8;
  }
  else {
    return Math.ceil(width / 4) * Math.ceil(height / 4) * 16;
  }
}

function getBlockDimensions(format) {
  return {width: 4, height: 4};
}

var wtu = WebGLTestUtils;
var ctu = CompressedTextureUtils;
var contextVersion = wtu.getDefault3DContextVersion();
var gl = wtu.create3DContext();
var ext;

var formats = null;

function runTestExtension() {
  // Test that enum values are listed correctly in supported formats and in the extension object.
  ctu.testCompressedFormatsListed(gl, validFormats);
  ctu.testCorrectEnumValuesInExt(ext, validFormats);
  // Test that texture upload buffer size is validated correctly.
  ctu.testFormatRestrictionsOnBufferSize(gl, validFormats, expectedByteLength, getBlockDimensions);
  // Test TexSubImage validation on dimensions
  // CompressedTexSubImage* will result in an
  // INVALID_OPERATION error only if one of the following conditions occurs:
  // * <width> is not a multiple of four, and <width> plus <xoffset> is not
  // equal to TEXTURE_WIDTH;
  // * <height> is not a multiple of four, and <height> plus <yoffset> is
  //           not equal to TEXTURE_HEIGHT; or
  // * <xoffset> or <yoffset> is not a multiple of four.
  ctu.testTexSubImageDimensions(gl, ext, validFormats, expectedByteLength, getBlockDimensions,
    16, 16, [
      { xoffset: 0, yoffset: 0, width: 4, height: 3,
        expectation: gl.INVALID_OPERATION, message: "height is not a multiple of 4" },
      { xoffset: 0, yoffset: 0, width: 3, height: 4,
        expectation: gl.INVALID_OPERATION, message: "width is not a multiple of 4" },
      { xoffset: 1, yoffset: 0, width: 4, height: 4,
        expectation: gl.INVALID_OPERATION, message: "xoffset is not a multiple of 4" },
      { xoffset: 0, yoffset: 1, width: 4, height: 4,
        expectation: gl.INVALID_OPERATION, message: "yoffset is not a multiple of 4" },
      { xoffset: 12, yoffset: 12, width: 4, height: 4,
        expectation: gl.NO_ERROR, message: "is valid" },
  ]);

  // Test TexImage validation on level dimensions combinations.
  // When level equals 0, width and height must be a multiple of 4.
  // When level is larger than 0, this constraint doesn't apply.

  let npotExpectation, npotMessage;
  if (contextVersion >= 2) {
    npotExpectation = gl.NO_ERROR;
    npotMessage = "valid";
  } else {
    npotExpectation = gl.INVALID_VALUE;
    npotMessage = "invalid";
  }

  ctu.testTexImageLevelDimensions(gl, ext, validFormats, expectedByteLength, getBlockDimensions,
    [
      { level: 0, width: 4, height: 3,
        expectation: gl.INVALID_OPERATION, message: "level is 0, height is not a multiple of 4" },
      { level: 0, width: 3, height: 4,
        expectation: gl.INVALID_OPERATION, message: "level is 0, width is not a multiple of 4" },
      { level: 0, width: 2, height: 2,
        expectation: gl.INVALID_OPERATION, message: "level is 0, width is not a multiple of 4" },
      { level: 0, width: 4, height: 4,
        expectation: gl.NO_ERROR, message: "is valid" },
      { level: 1, width: 1, height: 1,
        expectation: gl.INVALID_OPERATION, message: "implied base mip 2x2 is invalid" },
      { level: 1, width: 1, height: 2,
        expectation: gl.INVALID_OPERATION, message: "implied base mip 2x4 is invalid" },
      { level: 1, width: 2, height: 1,
        expectation: gl.INVALID_OPERATION, message: "implied base mip 4x2 is invalid" },
      { level: 1, width: 2, height: 2,
        expectation: gl.NO_ERROR, message: "implied base mip 4x4 is valid" },
      { level: 2, width: 1, height: 3,
        expectation: npotExpectation, message: "implied base mip 4x12 is " + npotMessage },
  ]);

  // Test that RGTC enums are not accepted by texImage2D
  if (contextVersion >= 2) {
    var tex = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D, tex);

    gl.texImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RED_RGTC1_EXT, 4, 4, 0, gl.RED, gl.UNSIGNED_BYTE, null);
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "COMPRESSED_RED_RGTC1_EXT fails with texImage2D");

    gl.texImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_SIGNED_RED_RGTC1_EXT, 4, 4, 0, gl.RED, gl.BYTE, null);
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "COMPRESSED_SIGNED_RED_RGTC1_EXT fails with texImage2D");

    gl.texImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RED_GREEN_RGTC2_EXT, 4, 4, 0, gl.RG, gl.UNSIGNED_BYTE, null);
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "COMPRESSED_RED_GREEN_RGTC2_EXT fails with texImage2D");

    gl.texImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT, 4, 4, 0, gl.RG, gl.BYTE, null);
    wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT fails with texImage2D");

    gl.deleteTexture(tex);
  }
};

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

    ctu.testCompressedFormatsUnavailableWhenExtensionDisabled(gl, validFormats, expectedByteLength, 4);

    ext = gl.getExtension("EXT_texture_compression_rgtc");

    wtu.runExtensionSupportedTest(gl, "EXT_texture_compression_rgtc", ext !== null);

    if (ext !== null) {
      runTestExtension();
    }
  }
}

runTest();

var successfullyParsed = true;
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