Dynamic load boards as DLL (windows only for now)

The .h files are pretty weird, should look at other C projects to see
how they load plugins. This function pointer business with typedefs is
kinda weird, not sure where they should live.

2 files changed, 43 insertions, 0 deletions

diff --git a/platform/platform.h b/platform/platform.h
index da1efa6..fd9b9bb 100644
--- a/platform/platform.h
+++ b/platform/platform.h
@@ -1,6 +1,11 @@
 #ifndef CLAK_PLATFORM_H_
 #define CLAK_PLATFORM_H_
 
+#include <stdbool.h>
+
+#include "../board/board.h"
+
+bool load_board(char *board_name, fn_board_on_down *on_down, fn_board_on_down *on_up);
 bool sound_init(float volume);
 void sound_play(unsigned char *buffer);
 void keyboard_unhook(void);
diff --git a/platform/win32.c b/platform/win32.c
index 90cd37c..cf22718 100644
--- a/platform/win32.c
+++ b/platform/win32.c
@@ -2,6 +2,9 @@
 #include <stdbool.h>
 #include <windows.h>
 
+#include "platform.h"
+#include "../board/board.h"
+
 /* Required callbacks */
 extern void keyboard_on_down(void);
 extern void keyboard_on_up(void);
@@ -77,4 +80,39 @@ void enter_idle(void)
 			exit(1);
 		}
 	}
+}
+
+bool load_board(char *board_name, fn_board_on_down *on_down, fn_board_on_down *on_up)
+{
+	char dll_name[100];
+	int r = snprintf(dll_name, 100, "./board/%s.dll", board_name);
+	if (r < 0 || r >= 100) {
+		printf("ERROR: Invalid board name.\n");
+		return false;
+	}
+
+	HMODULE board_module = LoadLibrary(dll_name);
+	if (board_module == NULL) {
+		printf("ERROR: Could not load board module.\n");
+		return false;
+	}
+	fn_board_init board_init = (fn_board_init) (void (*)(void)) GetProcAddress(board_module, "board_init");
+	if (board_init == NULL) {
+		printf("ERROR: No board down function could be loaded.\n");
+		return false;
+	}
+	board_init(&sound_play);
+
+	*on_down = (fn_board_on_down) GetProcAddress(board_module, "board_on_down");
+	if (on_down == NULL) {
+		printf("ERROR: No board down function could be loaded.\n");
+		return false;
+	}
+	*on_up = (fn_board_on_up) GetProcAddress(board_module, "board_on_up");
+	if (on_up == NULL) {
+		printf("ERROR: No board up function could be loaded.\n");
+		return false;
+	}
+
+	return true;
 }
\ No newline at end of file