Add custom_crosshair function

src/features/misc.c

@@ -0,0 +1,31 @@
+
+#include "features.h"
+#include "../include/sdk.h"
+#include "../include/globals.h"
+#include "../include/cvars.h"
+#include "../include/util.h"
+
+void custom_crosshair(void) {
+    if (!CVAR_ON(crosshair))
+        return;
+
+    /* Get window size, and then the center. */
+    int mx = game_info->m_width / 2;
+    int my = game_info->m_height / 2;
+
+    /* The real length is sqrt(2 * (len^2)) */
+    const int len   = cv_crosshair->value;
+    const int gap   = 1;
+    const float w   = 1;
+    const rgb_t col = { 255, 255, 255 };
+
+    /*
+     *   1\ /2
+     *     X
+     *   3/ \4
+     */
+    gl_drawline(mx - gap, my - gap, mx - gap - len, my - gap - len, w, col);
+    gl_drawline(mx + gap, my - gap, mx + gap + len, my - gap - len, w, col);
+    gl_drawline(mx - gap, my + gap, mx - gap - len, my + gap + len, w, col);
+    gl_drawline(mx + gap, my + gap, mx + gap + len, my + gap + len, w, col);
+}