Added data system to detect if run in good path

src/rendering/main.c

@@ -2,6 +2,7 @@
 #include <stdlib.h>
 
 #include "auto.h"
+#include "tools/data.h"
 #include "system.h"
 #include "scenery.h"
 #include "render.h"
@@ -13,6 +14,12 @@
 void paysagesInit()
 {
     systemInit();
+    if (!dataInit())
+    {
+        /* TODO Add error callback (for interface) */
+        fprintf(stderr, "ERROR : Can't locate data files.\n");
+        exit(1);
+    }
     openclInit();
 
     sceneryInit();

src/rendering/tools/data.c

@@ -0,0 +1,34 @@
+#include "data.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static const char* _datapath = NULL;
+
+static int _tryDataPath(const char* path)
+{
+    char* buffer;
+
+    buffer = malloc(sizeof (char) * (strlen(path) + 30));
+    strcpy(buffer, path);
+    strcat(buffer, "/.paysages_data");
+
+    FILE* f = fopen(buffer, "r");
+    free(buffer);
+    if (f)
+    {
+        _datapath = path;
+        fclose(f);
+        return 1;
+    }
+    else
+    {
+        return 0;
+    }
+}
+
+int dataInit()
+{
+    return _tryDataPath("./data");
+}

src/rendering/tools/data.h

@@ -0,0 +1,10 @@
+#ifndef _PAYSAGES_TOOLS_DATA_H_
+#define _PAYSAGES_TOOLS_DATA_H_
+
+/*
+ * Data directory management.
+ */
+
+int dataInit();
+
+#endif