OpenSpace/tests/test_texturetileset.inl

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#include "gtest/gtest.h"

#include <modules/globebrowsing/other/texturetileset.h>

#define _USE_MATH_DEFINES
#include <math.h>
#include <glm/glm.hpp>

class TextureTileSetTest : public testing::Test {};

using namespace openspace;

TEST_F(TextureTileSetTest, getTileIndexLevel) {

	// Create a tile set with maximum depth 0
	TextureTileSet tileSet(Geodetic2(M_PI, M_PI * 2), Geodetic2(M_PI / 2, - M_PI), 0);

	GeodeticPatch patch(Geodetic2(0, 0), Geodetic2(M_PI / 16, M_PI / 8));
	TileIndex tileIndex0 = tileSet.getTileIndex(patch);

	// Maximum level is 0
	ASSERT_EQ(tileIndex0.level, 0);


	// Create a tile set with maximum depth 10
	TextureTileSet tileSetDepth10(Geodetic2(M_PI, M_PI * 2), Geodetic2(M_PI / 2, - M_PI), 10);

	// A big tile that covers the whole latlon space
	GeodeticPatch patchBig(Geodetic2(0, 0), Geodetic2(M_PI / 2, M_PI));
	tileIndex0 = tileSetDepth10.getTileIndex(patchBig);

	// Should return 0 since the tile covers the whole latlon space
	ASSERT_EQ(tileIndex0.level, 0);

	
	// An edge case tile that covers a fourth of the latlon space
	GeodeticPatch patchEdgeCase(Geodetic2(0, 0), Geodetic2(M_PI / 4, M_PI / 2));
	TileIndex tileIndex1 = tileSetDepth10.getTileIndex(patchEdgeCase);

	// Now it can go up a level
	ASSERT_EQ(tileIndex1.level, 1);


	// Bigger than the edge case
	GeodeticPatch patchEdgeCaseBigger(Geodetic2(0, 0), Geodetic2(M_PI / 4 + 0.001, M_PI / 2 + 0.001));
	tileIndex0 = tileSetDepth10.getTileIndex(patchEdgeCaseBigger);

	// Should return 0 again
	ASSERT_EQ(tileIndex0.level, 0);
}

TEST_F(TextureTileSetTest, getTileIndexXY) {

	// Create a tile set with maximum depth 0
	TextureTileSet tileSet(Geodetic2(M_PI, M_PI * 2), Geodetic2(M_PI / 2, - M_PI), 0);

	GeodeticPatch patch(Geodetic2(0, 0), Geodetic2(M_PI / 16, M_PI / 8));
	TileIndex tileIndex0 = tileSet.getTileIndex(patch);

	// Maximum level is 0 so the x y indices should also be 0
	ASSERT_EQ(tileIndex0.x, 0);
	ASSERT_EQ(tileIndex0.y, 0);


	// Create a tile set with maximum depth 10
	TextureTileSet tileSetDepth10(Geodetic2(M_PI, M_PI * 2), Geodetic2(M_PI / 2, - M_PI), 10);

	// A big tile that covers the whole latlon space
	GeodeticPatch patchBig(Geodetic2(0, 0), Geodetic2(M_PI / 2, M_PI));
	tileIndex0 = tileSetDepth10.getTileIndex(patchBig);

	// Should return 0 in x and y since the tile covers the whole latlon space
	ASSERT_EQ(tileIndex0.x, 0);
	ASSERT_EQ(tileIndex0.y, 0);


	// A tile that covers a fourth of the latlon space
	GeodeticPatch patchEdgeCase(Geodetic2(0, 0), Geodetic2(M_PI / 4, M_PI / 2));
	TileIndex tileIndex1 = tileSetDepth10.getTileIndex(patchEdgeCase);

	// Now it can go up a level (1)
	// Since the position is 0, 0 it has 0, 0, in x, y index
	ASSERT_EQ(tileIndex1.x, 0);
	ASSERT_EQ(tileIndex1.y, 0);


	// A smaller edge case tile
	GeodeticPatch patchEdgeCase2(Geodetic2(0, 0), Geodetic2(M_PI / 8, M_PI / 4));
	TileIndex tileIndex11 = tileSetDepth10.getTileIndex(patchEdgeCase2);

	// Now it can go up two levels (2)
	// Since the position is 0, 0 it now has 1, 1, in x, y index
	// (north west corner is in that tile)
	ASSERT_EQ(tileIndex11.x, 1);
	ASSERT_EQ(tileIndex11.y, 1);
}


TEST_F(TextureTileSetTest, getUvTransformationPatchToTile) {
	// Create a tile set with maximum depth 0
	TextureTileSet tileSet(Geodetic2(M_PI, M_PI * 2), Geodetic2(M_PI / 2, -M_PI), 0);

	// Create a patch that covers the whole latlon space
	GeodeticPatch patch(Geodetic2(0, 0), Geodetic2(M_PI / 2, M_PI));

	// Should be a 1:1 mapping
	glm::mat3 patchToTileTransform =
		tileSet.getUvTransformationPatchToTile(patch, { 0, 0, 0 });

	ASSERT_EQ(patchToTileTransform, glm::mat3(1));
	
	// Create a smaller patch in the upper west side
	patch = GeodeticPatch(Geodetic2(M_PI / 4, - M_PI / 2), Geodetic2(M_PI / 4, M_PI / 2));
	patchToTileTransform =
		tileSet.getUvTransformationPatchToTile(patch, { 0,0,0 });

	glm::vec2 uvPatchSpace = glm::vec2(0, 0);
	glm::vec2 uvTileSpace = glm::vec2(patchToTileTransform * glm::vec3(uvPatchSpace, 1));
}