add tester files

src/tests.cpp

@@ -0,0 +1,99 @@
+#include <iostream>
+#include <array>
+#include <cmath>
+#include "gamematrix.h"
+
+using Matrix4 = std::array<std::array<double,4>,4>;
+using Vec3    = std::array<double,3>;
+
+bool eq(double a, double b) {
+    return std::fabs(a - b) < 0.0001;
+}
+
+Matrix4 identity() {
+    Matrix4 I{};
+    for (int i = 0; i < 4; i++) {
+        I[i][i] = 1.0;
+    }
+    return I;
+}
+
+Vec3 applyMatrix(const Matrix4& M, const Vec3& v) {
+    Vec3 r{0,0,0};
+
+    r[0] = M[0][0]*v[0] + M[0][1]*v[1] + M[0][2]*v[2] + M[0][3];
+    r[1] = M[1][0]*v[0] + M[1][1]*v[1] + M[1][2]*v[2] + M[1][3];
+    r[2] = M[2][0]*v[0] + M[2][1]*v[1] + M[2][2]*v[2] + M[2][3];
+
+    return r;
+}
+
+void testMatmulIdentity() {
+    Matrix4 A = identity();
+    Matrix4 B = identity();
+    Matrix4 C = gameMatrix::matmul(A, B);
+
+    for (int i = 0; i < 4; i++) {
+        for (int j = 0; j < 4; j++) {
+            double expected = (i == j ? 1.0 : 0.0);
+            if (!eq(C[i][j], expected)) {
+                std::cout << "[FAIL] matmul Identity\n";
+                return;
+            }
+        }
+    }
+
+    std::cout << "[OK] matmul Identity\n";
+}
+
+void testTranslate() {
+    Vec3 pos{1,2,3};
+    Matrix4 T = gameMatrix::translate(pos);
+
+    if (eq(T[0][3], 1) && eq(T[1][3], 2) && eq(T[2][3], 3))
+        std::cout << "[OK] translate\n";
+    else
+        std::cout << "[FAIL] translate\n";
+}
+
+void testRotZ90() {
+    Vec3 v{1,0,0};
+    Matrix4 R = gameMatrix::rot3D(90, 'z');
+    Vec3 r = applyMatrix(R, v);
+
+    if (eq(r[0], 0) && eq(r[1], 1) && eq(r[2], 0))
+        std::cout << "[OK] rotZ 90°\n";
+    else
+        std::cout << "[FAIL] rotZ 90°\n";
+}
+
+void testRotX180() {
+    Vec3 v{0,1,0};
+    Matrix4 R = gameMatrix::rot3D(180, 'x');
+    Vec3 r = applyMatrix(R, v);
+
+    if (eq(r[0], 0) && eq(r[1], -1) && eq(r[2], 0))
+        std::cout << "[OK] rotX 180°\n";
+    else
+        std::cout << "[FAIL] rotX 180°\n";
+}
+
+void testRotY270() {
+    Vec3 v{1,0,0};
+    Matrix4 R = gameMatrix::rot3D(270, 'y');
+    Vec3 r = applyMatrix(R, v);
+
+    if (eq(r[0], 0) && eq(r[1], 0) && eq(r[2], -1))
+        std::cout << "[OK] rotY 270°\n";
+    else
+        std::cout << "[FAIL] rotY 270°\n";
+}
+
+int main() {
+    testMatmulIdentity();
+    testTranslate();
+    testRotZ90();
+    testRotX180();
+    testRotY270();
+    return 0;
+}