//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================

#ifndef VTFPREVIEWPANEL_H
#define VTFPREVIEWPANEL_H

#ifdef _WIN32
#pragma once
#endif

#include "materialsystem/MaterialSystemUtil.h"
#include "mathlib/vector.h"
#include "tier1/utlstring.h"
#include "vgui_controls/Panel.h"

//-----------------------------------------------------------------------------
// Forward declarations
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
//
// VTF Preview panel
//
//-----------------------------------------------------------------------------
class CVTFPreviewPanel : public vgui::Panel {
    DECLARE_CLASS_SIMPLE(CVTFPreviewPanel, vgui::Panel);

   public:
    // constructor
    CVTFPreviewPanel(vgui::Panel *pParent, const char *pName);
    virtual ~CVTFPreviewPanel();

    void SetVTF(const char *pFullPath, bool bLoadImmediately = true);
    const char *GetVTF() const;

    // Paints the texture
    virtual void Paint(void);

   private:
    void PaintNormalMapTexture(void);
    void PaintCubeTexture(void);
    void PaintStandardTexture(void);
    void PaintVolumeTexture(void);

    // Set up a projection matrix for a 90 degree fov
    void SetupProjectionMatrix(int nWidth, int nHeight);

    // Sets the camera to look at the the thing we're spinning around
    void LookAt(const Vector &vecLookAt, float flRadius);

    // Draw a sphere
    void RenderSphere(const Vector &vCenter, float flRadius, int nTheta,
                      int nPhi);

    CUtlString m_VTFName;
    CTextureReference m_PreviewTexture;
    CMaterialReference m_PreviewMaterial;
    int m_nTextureID;
    Vector m_vecCameraDirection;
    float m_flLastRotationTime;
};

#endif  // VTFPREVIEWPANEL_H