[CSM] Add basic HUD manipulation. (#6067)

* [CSM] Add basic HUD manipulation.

Workaround for on_connect not working right now.

src/client/hud.h

@@ -0,0 +1,136 @@
+/*
+Minetest
+Copyright (C) 2010-2013 kwolekr, Ryan Kwolek <kwolekr@minetest.net>
+Copyright (C) 2017 red-001 <red-001@outlook.ie>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef CLIENT_HUD_HEADER
+#define CLIENT_HUD_HEADER
+
+#include <vector>
+#include <IGUIFont.h>
+#include "irr_aabb3d.h"
+#include "../hud.h"
+
+class Client;
+class ITextureSource;
+class Inventory;
+class InventoryList;
+class LocalPlayer;
+struct ItemStack;
+
+class Hud
+{
+public:
+	video::IVideoDriver *driver;
+	scene::ISceneManager *smgr;
+	gui::IGUIEnvironment *guienv;
+	Client *client;
+	LocalPlayer *player;
+	Inventory *inventory;
+	ITextureSource *tsrc;
+
+	video::SColor crosshair_argb;
+	video::SColor selectionbox_argb;
+	bool use_crosshair_image = false;
+	std::string hotbar_image = "";
+	bool use_hotbar_image = false;
+	std::string hotbar_selected_image = "";
+	bool use_hotbar_selected_image = false;
+
+	Hud(gui::IGUIEnvironment *guienv, Client *client, LocalPlayer *player,
+			Inventory *inventory);
+	~Hud();
+
+	void drawHotbar(u16 playeritem);
+	void resizeHotbar();
+	void drawCrosshair();
+	void drawSelectionMesh();
+	void updateSelectionMesh(const v3s16 &camera_offset);
+
+	std::vector<aabb3f> *getSelectionBoxes() { return &m_selection_boxes; }
+
+	void setSelectionPos(const v3f &pos, const v3s16 &camera_offset);
+
+	v3f getSelectionPos() const { return m_selection_pos; }
+
+	void setSelectionMeshColor(const video::SColor &color)
+	{
+		m_selection_mesh_color = color;
+	}
+
+	void setSelectedFaceNormal(const v3f &face_normal)
+	{
+		m_selected_face_normal = face_normal;
+	}
+
+	void drawLuaElements(const v3s16 &camera_offset);
+
+private:
+	void drawStatbar(v2s32 pos, u16 corner, u16 drawdir, std::string texture,
+			s32 count, v2s32 offset, v2s32 size = v2s32());
+
+	void drawItems(v2s32 upperleftpos, v2s32 screen_offset, s32 itemcount,
+			s32 inv_offset, InventoryList *mainlist, u16 selectitem,
+			u16 direction);
+
+	void drawItem(const ItemStack &item, const core::rect<s32> &rect, bool selected);
+
+	float m_hud_scaling; // cached minetest setting
+	v3s16 m_camera_offset;
+	v2u32 m_screensize;
+	v2s32 m_displaycenter;
+	s32 m_hotbar_imagesize; // Takes hud_scaling into account, updated by resizeHotbar()
+	s32 m_padding; // Takes hud_scaling into account, updated by resizeHotbar()
+	video::SColor hbar_colors[4];
+
+	std::vector<aabb3f> m_selection_boxes;
+	std::vector<aabb3f> m_halo_boxes;
+	v3f m_selection_pos;
+	v3f m_selection_pos_with_offset;
+
+	scene::IMesh *m_selection_mesh = nullptr;
+	video::SColor m_selection_mesh_color;
+	v3f m_selected_face_normal;
+
+	video::SMaterial m_selection_material;
+
+	enum
+	{
+		HIGHLIGHT_BOX,
+		HIGHLIGHT_HALO,
+		HIGHLIGHT_NONE
+	} m_mode;
+};
+
+enum ItemRotationKind
+{
+	IT_ROT_SELECTED,
+	IT_ROT_HOVERED,
+	IT_ROT_DRAGGED,
+	IT_ROT_NONE, // Must be last, also serves as number
+};
+
+void drawItemStack(video::IVideoDriver *driver,
+		gui::IGUIFont *font,
+		const ItemStack &item,
+		const core::rect<s32> &rect,
+		const core::rect<s32> *clip,
+		Client *client,
+		ItemRotationKind rotation_kind);
+
+#endif