test: add some tests for mat3

test/src/test_mat3.c

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c), Recep Aslantas.
+ *
+ * MIT License (MIT), http://opensource.org/licenses/MIT
+ * Full license can be found in the LICENSE file
+ */
+
+#include "test_common.h"
+
+#define m 3
+#define n 3
+
+void
+test_mat3(void **state) {
+  mat3  m1 = GLM_MAT3_IDENTITY_INIT;
+  mat3  m2 = GLM_MAT3_IDENTITY_INIT;
+  mat3  m3;
+  mat3  m4 = GLM_MAT3_ZERO_INIT;
+  mat3  m5;
+  int   i, j, k;
+
+  /* test identity matrix multiplication */
+  glmc_mat3_mul(m1, m2, m3);
+  for (i = 0; i < m; i++) {
+    for (j = 0; j < n; j++) {
+      if (i == j)
+        assert_true(m3[i][j] == 1.0f);
+      else
+        assert_true(m3[i][j] == 0.0f);
+    }
+  }
+
+  /* test random matrices */
+  /* random matrices */
+  test_rand_mat3(m1);
+  test_rand_mat3(m2);
+
+  glmc_mat3_mul(m1, m2, m3);
+  for (i = 0; i < m; i++) {
+    for (j = 0; j < n; j++) {
+      for (k = 0; k < m; k++)
+        /* column-major */
+        m4[i][j] += m1[k][j] * m2[i][k];
+    }
+  }
+
+  test_assert_mat3_eq(m3, m4);
+
+  for (i = 0; i < 100000; i++) {
+    test_rand_mat3(m3);
+    test_rand_mat3(m4);
+
+    /* test inverse precise */
+    glmc_mat3_inv(m3, m4);
+    glmc_mat3_inv(m4, m5);
+    test_assert_mat3_eq(m3, m5);
+  }
+}