ModelSpinner.h

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// Copyright © 2008-2021 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#pragma once
 
#include "RefCounted.h"
#include "graphics/Light.h"
 
namespace Graphics {
    class RenderTarget;
}
 
// Forward declare this type from imgui.h
using ImTextureID = void *;
 
#include "Shields.h"
#include "scenegraph/Model.h"
#include "scenegraph/ModelSkin.h"
 
// TODO:
// - make this code reusable across multiple usecases (camera, rear-view mirror, UI preview, etc.)
// - Render more than a single model, e.g. attachments / equipment / shields (a scene, scenegraph hierarchy, etc.)
// - Add support for the usual post-processing chain (integrate with regular scene rendering)
// In essence, we want to make the regular main-scene rendering code modular and able to render
// arbitrary scenes to RTs that we can use in Pigui et. al.
// For now we'll do a basic implementation here to move the model spinner functionality to Pigui.
namespace PiGui {
    class ModelSpinner : public RefCounted {
    public:
        ModelSpinner();
 
        // Set the ship we should be looking at.
        void SetModel(SceneGraph::Model *model, const SceneGraph::ModelSkin &skin, unsigned int pattern);
 
        // Called to draw the model to the render target.
        void Render();
 
        // Draws the model spinner widget and handles user interaction.
        // Expected to be called during a Begin/End ImGui block.
        // The modelspinner attempts to take all the available horizontal space
        // in the window - use ImGui::BeginChild() to constrain the sizing.
        void DrawPiGui();
 
        // Set the size of the texture to render.
        void SetSize(vector2d size);
 
        // Retrieve the size of the rendered texture.
        const vector2d GetSize() { return static_cast<vector2d>(m_size); }
 
        // Transform a model-space location into a screen-space position.
        vector2d ModelSpaceToScreenSpace(vector3d modelSpaceVec);
 
    private:
        std::unique_ptr<Graphics::RenderTarget> m_renderTarget;
        std::unique_ptr<SceneGraph::Model> m_model;
        SceneGraph::ModelSkin m_skin;
        std::unique_ptr<Shields> m_shields;
        Graphics::Light m_light;
 
        void CreateRenderTarget();
        ImTextureID GetTextureID();
 
        // The size of the render target.
        vector2f m_size;
        // Do we need to resize the render target next frame?
        bool m_needsResize;
 
        // After the user manually rotates the model, hold that orientation for
        // a second to let them look at it. Assumes Update() is called every
        // frame while visible.
        float m_pauseTime;
 
        // The rotation of the model.
        vector2f m_rot;
    };
} // namespace PiGui