godot/tests/core/math/test_projection.h

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/*  test_projection.h                                                     */
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#ifndef TEST_PROJECTION_H
#define TEST_PROJECTION_H

#include "core/math/projection.h"

#include "core/string/print_string.h"
#include "tests/test_macros.h"

namespace TestProjection {

TEST_CASE("[Projection] Default construct") {
	Projection p;
	CHECK(p.columns[0][0] == 1.0);
	CHECK(p.columns[0][1] == 0.0);
	CHECK(p.columns[0][2] == 0.0);
	CHECK(p.columns[0][3] == 0.0);

	CHECK(p.columns[1][0] == 0.0);
	CHECK(p.columns[1][1] == 1.0);
	CHECK(p.columns[1][2] == 0.0);
	CHECK(p.columns[1][3] == 0.0);

	CHECK(p.columns[2][0] == 0.0);
	CHECK(p.columns[2][1] == 0.0);
	CHECK(p.columns[2][2] == 1.0);
	CHECK(p.columns[2][3] == 0.0);

	CHECK(p.columns[3][0] == 0.0);
	CHECK(p.columns[3][1] == 0.0);
	CHECK(p.columns[3][2] == 0.0);
	CHECK(p.columns[3][3] == 1.0);
}

bool projection_is_equal_approx(const Projection &p_a, const Projection &p_b) {
	for (int i = 0; i < 4; i++) {
		for (int j = 0; j < 4; j++) {
			if (!Math::is_equal_approx(p_a.columns[i][j], p_b.columns[i][j])) {
				return false;
			}
		}
	}
	return true;
}

TEST_CASE("[Projection] Orthogonal projection matrix inversion") {
	Projection p = Projection::create_orthogonal(-125.0f, 125.0f, -125.0f, 125.0f, 0.01f, 25.0f);
	CHECK(projection_is_equal_approx(p.inverse() * p, Projection()));
}

TEST_CASE("[Projection] Perspective projection matrix inversion") {
	Projection p = Projection::create_perspective(90.0f, 1.77777f, 0.05f, 4000.0f);
	CHECK(projection_is_equal_approx(p.inverse() * p, Projection()));
}

} //namespace TestProjection

#endif // TEST_PROJECTION_H