[FEAT] Add Matrix * Tuple

tests/03_matrix.cpp

@@ -28,6 +28,7 @@
 #include <catch.hpp>
 
 #include "matrix.h"
+#include "tuple.h"
 
 using namespace Raytracer;
 
@@ -129,3 +130,44 @@ TEST_CASE("[Matrix] Matrix equality with different matrices", "[Matrix]")
 
     REQUIRE(a != b);
 }
+
+/* ------------------------------------------------------------------------- */
+
+TEST_CASE("[Matrix] Multiplying two matrices", "[Matrix]")
+{
+    Matrix a = {
+        {1, 2, 3, 4},
+        {5, 6, 7, 8},
+        {9, 8, 7, 6},
+        {5, 4, 3, 2}
+    };
+    Matrix b = {
+        {-2, 1, 2,  3},
+        { 3, 2, 1, -1},
+        { 4, 3, 6,  5},
+        { 1, 2, 7,  8}
+    };
+    Matrix c = {
+        {20, 22,  50,  48},
+        {44, 54, 114, 108},
+        {40, 58, 110, 102},
+        {16, 26,  46,  42}
+    };
+
+    REQUIRE((a * b) == c);
+}
+
+/* ------------------------------------------------------------------------- */
+
+TEST_CASE("[Matrix] a matrix multiplied by a tuple", "[Matrix]")
+{
+    Matrix a = {
+        {1, 2, 3, 4},
+        {2, 4, 4, 2},
+        {8, 6, 4, 1},
+        {0, 0, 0, 1}
+    };
+    Tuple b(1, 2, 3, 1);
+
+    REQUIRE((a * b) == Tuple(18, 24, 33, 1));
+}