add some temporary code for setting a random tetromino

src/game/tetromino/placing.c

@@ -1,4 +1,7 @@
+#include "placing.h"
+
 #include <stdint.h>
+#include <stdlib.h>
 
 #include "../../window/colour.h"
 #include "../game.h"
@@ -34,3 +37,41 @@ void tmp_set_all(GameData* game_data) {
 
     set_shape(game_data->row, TETROMINO_T, COLOUR_MAGENTA, 5, 16);
 }
+
+void tmp_set_random(GameData* game_data) {
+    uint32_t x = rand() % TETROMINO_COUNT;
+    Shape shape = 0;
+    Colour colour = {0};
+    switch (x) {
+    case 0:
+        shape = TETROMINO_I;
+        colour = COLOUR_CYAN;
+        break;
+    case 1:
+        shape = TETROMINO_J;
+        colour = COLOUR_BLUE;
+        break;
+    case 2:
+        shape = TETROMINO_L;
+        colour = COLOUR_ORANGE;
+        break;
+    case 3:
+        shape = TETROMINO_O;
+        colour = COLOUR_YELLOW;
+        break;
+    case 4:
+        shape = TETROMINO_S;
+        colour = COLOUR_RED;
+        break;
+    case 5:
+        shape = TETROMINO_T;
+        colour = COLOUR_MAGENTA;
+        break;
+    case 6:
+        shape = TETROMINO_Z;
+        colour = COLOUR_GREEN;
+        break;
+    }
+
+    set_shape(game_data->row, shape, colour, 1, 1);
+}

src/game/tetromino/shapes.h

@@ -4,7 +4,7 @@
 #define SHAPE_WIDTH  4
 #define SHAPE_HEIGHT 4
 
-
+#define TETROMINO_COUNT 7
 typedef uint16_t Shape;
 enum {
     // clang-format off