/*

 * This file is part of OpenTTD.

 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.

 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.

 */

/** @file landscape_partial_pixel_z.cpp Tests for consistency/validity of the results of GetPartialPixelZ. */

#include "../stdafx.h"

#include "../3rdparty/catch2/catch.hpp"

#include "../landscape.h"

#include "../slope_func.h"

#include <array>

/**

 * Check whether the addition of two slope's GetPartialPixelZ values results in

 * the GetPartialPixelZ values of the expected slope.

 * This iterates over all sub-pixel locations within a single tile.

 * @param slope_expected The slope that is expected.

 * @param slope_a The first slope of the addition.

 * @param slope_b The second slope of the addition.

 * @return True iff at all GetPartialPixelZ results are the same for each sub-tile position.

 */

bool CheckPartialPixelZSlopeAddition(Slope slope_expected, Slope slope_a, Slope slope_b)

{

	for (uint x = 0; x < TILE_SIZE; x++) {

		for (uint y = 0; y < TILE_SIZE; y++) {

			int z_a = GetPartialPixelZ(x, y, slope_a);

			int z_b = GetPartialPixelZ(x, y, slope_b);

			int z_result = GetPartialPixelZ(x, y, slope_expected);

			if (z_result != z_a + z_b) return false;

		}

	}

	return true;

}

TEST_CASE("PartialPixelSlopeAdditionTest - A one corner slope, plus the opposite three corner slope results in a flat but elevated slope")

{

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, SLOPE_N, SLOPE_WSE));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, SLOPE_E, SLOPE_NWS));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, SLOPE_S, SLOPE_ENW));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, SLOPE_W, SLOPE_SEN));

}

TEST_CASE("PartialPixelSlopeAdditionTest - Diagonal slopes with their opposite slope result in a flat but elevated slope")

{

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, SLOPE_NW, SLOPE_SE));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, SLOPE_SW, SLOPE_NE));

}

TEST_CASE("PartialPixelSlopeAdditionTest - Half tile slopes with their opposite half tile slope result in a flat but elevated slope")

{

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, HalftileSlope(SLOPE_N, CORNER_N), HalftileSlope(SLOPE_S, CORNER_S)));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_ELEVATED, HalftileSlope(SLOPE_E, CORNER_E), HalftileSlope(SLOPE_W, CORNER_W)));

}

TEST_CASE("PartialPixelSlopeAdditionTest - Two opposite one corner slopes result in the two corner slope with opposite corners")

{

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_NS, SLOPE_N, SLOPE_S));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_EW, SLOPE_E, SLOPE_W));

}

TEST_CASE("PartialPixelSlopeAdditionTest - A steep slope is a one corner slope on top of a three corner slope")

{

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_STEEP_N, SLOPE_N, SLOPE_ENW));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_STEEP_E, SLOPE_E, SLOPE_SEN));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_STEEP_S, SLOPE_S, SLOPE_WSE));

	CHECK(CheckPartialPixelZSlopeAddition(SLOPE_STEEP_W, SLOPE_W, SLOPE_NWS));

}

TEST_CASE("PartialPixelSlopeAdditionTest - A half tile steep slope is a one corner half tile on top of a three corner slope")

{

	CHECK(CheckPartialPixelZSlopeAddition(HalftileSlope(SLOPE_STEEP_N, CORNER_N), HalftileSlope(SLOPE_N, CORNER_N), SLOPE_ENW));

	CHECK(CheckPartialPixelZSlopeAddition(HalftileSlope(SLOPE_STEEP_E, CORNER_E), HalftileSlope(SLOPE_E, CORNER_E), SLOPE_SEN));

	CHECK(CheckPartialPixelZSlopeAddition(HalftileSlope(SLOPE_STEEP_S, CORNER_S), HalftileSlope(SLOPE_S, CORNER_S), SLOPE_WSE));

	CHECK(CheckPartialPixelZSlopeAddition(HalftileSlope(SLOPE_STEEP_W, CORNER_W), HalftileSlope(SLOPE_W, CORNER_W), SLOPE_NWS));

}

/**

 * Check whether the partial pixel Z values are the expected values. The arrays

 * are as if the map is rotated 45 degrees counterclockwise.

 * @param slope The slope that is to be checked.

 * @param expected The expect partial pixels Z values.

 * @return True iff at all GetPartialPixelZ results are the same as the expected Z-coordinates.

 */

bool CheckPartialPixelZ(Slope slope, std::array<int, TILE_SIZE * TILE_SIZE> expected)

{

	for (uint i = 0; i < expected.size(); i++) {

		int actual = GetPartialPixelZ(GB(i, 4, 4), GB(i, 0, 4), slope);

		if (actual != expected[i]) return false;

	}

	return true;

}

TEST_CASE("PartialPixelTest - One corner up slopes - SLOPE_N")

{

	CHECK(CheckPartialPixelZ(SLOPE_N, {

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0,

		7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0,

		6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0,

		6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0,

		5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0,

		5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0,

		4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,

		4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}));

}

TEST_CASE("PartialPixelTest - One corner up slopes - SLOPE_E")

{

	CHECK(CheckPartialPixelZ(SLOPE_E, {

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7,

		0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7,

		0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,

		0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6,

		0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5,

		0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5,

		0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}));

}

TEST_CASE("PartialPixelTest - One corner up slopes - SLOPE_S")

{

	CHECK(CheckPartialPixelZ(SLOPE_S, {

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4,

		0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4,

		0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5,

		0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5,

		0, 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6,

		0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,

		0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7,

		0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7}));

}

TEST_CASE("PartialPixelTest - One corner up slopes - SLOPE_W")

{

	CHECK(CheckPartialPixelZ(SLOPE_W, {

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,

		5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0,

		5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 0,

		6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0,

		6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0,

		7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 0,

		7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0}));

}

TEST_CASE("PartialPixelTest - Two corner up, diagonal slopes - SLOPE_NE")

{

	CHECK(CheckPartialPixelZ(SLOPE_NE, {

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,

		7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,

		6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

		6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

		5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

		5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

		4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

		4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

		3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

		3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

		2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

		2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}));

}

TEST_CASE("PartialPixelTest - Two corner up, diagonal slopes - SLOPE_SE")

{

	CHECK(CheckPartialPixelZ(SLOPE_SE, {

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8}));

}

TEST_CASE("PartialPixelTest - Two corner up, diagonal slopes - SLOPE_SW")

{

	CHECK(CheckPartialPixelZ(SLOPE_SW, {

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

		1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

		2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

		2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

		3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

		3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

		4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

		4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

		5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

		5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

		6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

		6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

		7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,

		7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8}));

}

TEST_CASE("PartialPixelTest - Two corner up, diagonal slopes - SLOPE_NW")

{

	CHECK(CheckPartialPixelZ(SLOPE_NW, {

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0}));

}

TEST_CASE("PartialPixelTest - Two opposite corner up slopes - SLOPE_NS")

{

	CHECK(CheckPartialPixelZ(SLOPE_NS, {

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0,

		7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1,

		6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1,

		6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2,

		5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2,

		5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3,

		4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3,

		4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4,

		3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4,

		3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5,

		2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5,

		2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6,

		1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,

		1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7,

		0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7}));

}

TEST_CASE("PartialPixelTest - Two opposite corner up slopes - SLOPE_EW")

{

	CHECK(CheckPartialPixelZ(SLOPE_EW, {

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7,

		1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7,

		1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,

		2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6,

		2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5,

		3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5,

		3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4,

		4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 4,

		4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3,

		5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2, 3,

		5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2, 2,

		6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1, 2,

		6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1, 1,

		7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0, 1,

		7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0, 0}));

}

TEST_CASE("PartialPixelTest - Three corner up slopes - SLOPE_ENW")

{

	CHECK(CheckPartialPixelZ(SLOPE_ENW, {

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4,

		8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4,

		8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3,

		8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3,

		8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2,

		8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2,

		8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1,

		8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1}));

}

TEST_CASE("PartialPixelTest - Three corner up slopes - SLOPE_SEN")

{

	CHECK(CheckPartialPixelZ(SLOPE_SEN, {

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8,

		3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8,

		3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8,

		2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8,

		2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8,

		1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8,

		1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8}));

}

TEST_CASE("PartialPixelTest - Three corner up slopes - SLOPE_WSE")

{

	CHECK(CheckPartialPixelZ(SLOPE_WSE, {

		0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8,

		1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8,

		1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8,

		2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8,

		2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8,

		3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8,

		3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8,

		4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8,

		4, 5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		5, 5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		5, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		6, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8}));

}

TEST_CASE("PartialPixelTest - Three corner up slopes - SLOPE_NWS")

{

	CHECK(CheckPartialPixelZ(SLOPE_NWS, {

		8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0,

		8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1,

		8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1,

		8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2,

		8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2,

		8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3, 3,

		8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4, 3,

		8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4, 4,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5, 4,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5, 5,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6, 5,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6, 6,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 6,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8}));

}

TEST_CASE("PartialPixelTest - Normal half tile slopes - SLOPE/CORNER_N")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_N, CORNER_N), {

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}));

}

TEST_CASE("PartialPixelTest - Normal half tile slopes - SLOPE/CORNER_E")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_E, CORNER_E), {

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8}));

}

TEST_CASE("PartialPixelTest - Normal half tile slopes - SLOPE/CORNER_S")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_S, CORNER_S), {

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,

		0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8}));

}

TEST_CASE("PartialPixelTest - Normal half tile slopes - SLOPE/CORNER_W")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_W, CORNER_W), {

		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0, 0,

		8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 0}));

}

TEST_CASE("PartialPixelTest - Steep slopes - SLOPE_STEEP_N")

{

	CHECK(CheckPartialPixelZ(SLOPE_STEEP_N, {

		16, 15, 15, 14, 14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,

		15, 15, 14, 14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,

		15, 14, 14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,

		14, 14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,

		14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,

		13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,

		13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,

		12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,

		12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,

		11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,

		11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,

		10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,

		10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,

		 9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,

		 9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,

		 8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,  1}));

}

TEST_CASE("PartialPixelTest - Steep slopes - SLOPE_STEEP_E")

{

	CHECK(CheckPartialPixelZ(SLOPE_STEEP_E, {

		 8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16,

		 8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15,

		 7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15,

		 7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14,

		 6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14,

		 6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13,

		 5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13,

		 5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12,

		 4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12,

		 4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11,

		 3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11,

		 3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10,

		 2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10,

		 2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9,

		 1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,

		 1,  1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8}));

}

TEST_CASE("PartialPixelTest - Steep slopes - SLOPE_STEEP_S")

{

	CHECK(CheckPartialPixelZ(SLOPE_STEEP_S, {

		 0,  1,  1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,

		 1,  1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,

		 1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,

		 2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9,

		 2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10,

		 3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10,

		 3,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11,

		 4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11,

		 4,  5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12,

		 5,  5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12,

		 5,  6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13,

		 6,  6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13,

		 6,  7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14,

		 7,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14,

		 7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15,

		 8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15}));

}

TEST_CASE("PartialPixelTest - Steep slopes - SLOPE_STEEP_W")

{

	CHECK(CheckPartialPixelZ(SLOPE_STEEP_W, {

		 8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,  1,  0,

		 8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,  1,

		 9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,

		 9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,

		10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,

		10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,

		11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,

		11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,  4,

		12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,  4,

		12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,  5,

		13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,

		13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,  6,

		14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,  6,

		14, 14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,  7,

		15, 14, 14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8,  7,

		15, 15, 14, 14, 13, 13, 12, 12, 11, 11, 10, 10,  9,  9,  8,  8}));

}

TEST_CASE("PartialPixelTest - Half tile on top of steep slopes - SLOPE_STEEP/CORNER_N")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_STEEP_N, CORNER_N), {

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,

		16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,

		16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,

		16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,

		16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,

		16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,

		16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,

		16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,

		16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,

		16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,  1}));

}

TEST_CASE("PartialPixelTest - Half tile on top of steep slopes - SLOPE_STEEP/CORNER_E")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_STEEP_E, CORNER_E), {

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16,

		 4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16,

		 3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16,

		 3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16,

		 2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16,

		 2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16,

		 1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16,

		 1,  1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16}));

}

TEST_CASE("PartialPixelTest - Half tile on top of steep slopes - SLOPE_STEEP/CORNER_S")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_STEEP_S, CORNER_S), {

		 0,  1,  1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8,

		 1,  1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16,

		 1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16,

		 2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16,

		 2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16,

		 3,  3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16,

		 3,  4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16,

		 4,  4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16,

		 4,  5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16,

		 5,  5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 5,  6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 6,  6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 6,  7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 7,  7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 7,  8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,

		 8, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16}));

}

TEST_CASE("PartialPixelTest - Half tile on top of steep slopes - SLOPE_STEEP/CORNER_W")

{

	CHECK(CheckPartialPixelZ(HalftileSlope(SLOPE_STEEP_W, CORNER_W), {

		 8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,  1,  0,

		16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,  1,

		16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,  1,

		16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,  2,

		16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,  2,

		16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,  3,

		16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,  3,

		16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,  4,

		16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,  4,

		16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,  5,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,  5,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,  6,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,  6,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,  7,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8,  7,

		16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,  8}));

}