Add model[] formspec element (#10320)

Formspec element to display models, written by @kilbith, rebased and tweaked.

Co-authored-by: Jean-Patrick Guerrero <jeanpatrick.guerrero@gmail.com>
Co-authored-by: sfan5 <sfan5@live.de>

1 files changed, 85 insertions, 0 deletions

diff --git a/src/gui/guiScene.h b/src/gui/guiScene.h
new file mode 100644
index 000000000..707e6f66a
--- /dev/null
+++ b/src/gui/guiScene.h
@@ -0,0 +1,85 @@
+/*
+Minetest
+Copyright (C) 2020 Jean-Patrick Guerrero <jeanpatrick.guerrero@gmail.com>
+
+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.
+*/
+
+#pragma once
+
+#include "irrlichttypes_extrabloated.h"
+#include "ICameraSceneNode.h"
+#include "StyleSpec.h"
+
+using namespace irr;
+
+class GUIScene : public gui::IGUIElement
+{
+public:
+	GUIScene(gui::IGUIEnvironment *env, scene::ISceneManager *smgr,
+		 gui::IGUIElement *parent, core::recti rect, s32 id = -1);
+
+	~GUIScene();
+
+	scene::IAnimatedMeshSceneNode *setMesh(scene::IAnimatedMesh *mesh = nullptr);
+	void setTexture(u32 idx, video::ITexture *texture);
+	void setBackgroundColor(const video::SColor &color) noexcept { m_bgcolor = color; };
+	void enableMouseControl(bool enable) noexcept { m_mouse_ctrl = enable; };
+	void setRotation(v2f rot) noexcept { m_custom_rot = rot; };
+	void enableContinuousRotation(bool enable) noexcept { m_inf_rot = enable; };
+	void setStyles(const std::array<StyleSpec, StyleSpec::NUM_STATES> &styles);
+
+	virtual void draw();
+	virtual bool OnEvent(const SEvent &event);
+
+private:
+	void calcOptimalDistance();
+	void updateTargetPos();
+	void updateCamera(scene::ISceneNode *target);
+	void setCameraRotation(v3f rot);
+	/// @return true indicates that the rotation was corrected
+	bool correctBounds(v3f &rot);
+	void cameraLoop();
+
+	void updateCameraPos() { m_cam_pos = m_cam->getPosition(); };
+	v3f getCameraRotation() const { return (m_cam_pos - m_target_pos).getHorizontalAngle(); };
+	void rotateCamera(const v3f &delta) { setCameraRotation(getCameraRotation() + delta); };
+
+	scene::ISceneManager *m_smgr;
+	video::IVideoDriver *m_driver;
+	scene::ICameraSceneNode *m_cam;
+	scene::ISceneNode *m_target = nullptr;
+	scene::IAnimatedMeshSceneNode *m_mesh = nullptr;
+
+	f32 m_cam_distance = 50.f;
+
+	u64 m_last_time = 0;
+
+	v3f m_cam_pos;
+	v3f m_target_pos;
+	v3f m_last_target_pos;
+	// Cursor positions
+	v2f m_curr_pos;
+	v2f m_last_pos;
+	// Initial rotation
+	v2f m_custom_rot;
+
+	bool m_mouse_ctrl = true;
+	bool m_update_cam = false;
+	bool m_inf_rot    = false;
+	bool m_initial_rotation = true;
+
+	video::SColor m_bgcolor = 0;
+};