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Heretic: Add "use artifact" mouse button

--- a/src/heretic/g_game.c

+++ b/src/heretic/g_game.c

@@ -423,7 +423,7 @@

     }

     // Use artifact key

-    if (gamekeydown[key_useartifact])

+    if (gamekeydown[key_useartifact] || mousebuttons[mousebuseartifact])

     {

         if (gamekeydown[key_speed] && !noartiskip)

         {

@@ -430,6 +430,7 @@

             if (players[consoleplayer].inventory[inv_ptr].type != arti_none)

             {

                 gamekeydown[key_useartifact] = false;

+                mousebuttons[mousebuseartifact] = false;

                 cmd->arti = 0xff;       // skip artifact code

             }

         }

@@ -840,7 +841,10 @@

 static void SetMouseButtons(unsigned int buttons_mask)

 {

     int i;

+    player_t *plr;

+    plr = &players[consoleplayer];

+

     for (i=0; i<MAX_MOUSE_BUTTONS; ++i)

     {

         unsigned int button_on = (buttons_mask & (1 << i)) != 0;

@@ -864,6 +868,14 @@

             else if (i == mousebinvright)

             {

                 InventoryMoveRight();

+            }

+            else if (i == mousebuseartifact)

+            {

+                if (!inventory)

+                {

+                    plr->readyArtifact = plr->inventory[inv_ptr].type;

+                }

+                usearti = true;

             }

         }