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

#ifndef VMTPREVIEWPANEL_H
#define VMTPREVIEWPANEL_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
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
//
// VMT Preview panel
//
//-----------------------------------------------------------------------------
class CVMTPreviewPanel : public vgui::Panel {
    DECLARE_CLASS_SIMPLE(CVMTPreviewPanel, vgui::Panel);

   public:
    // constructor
    CVMTPreviewPanel(vgui::Panel *pParent, const char *pName);
    void SetVMT(const char *pMaterialName);
    const char *GetVMT() const;

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

    // View it in 3D or 2D mode
    void DrawIn3DMode(bool b3DMode);

   private:
    // Two different preview methods
    void DrawSphere(void);
    void DrawRectangle(void);

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

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

    // Sets up lighting state
    void SetupLightingState();

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

    // Draw sprite-card based materials
    void RenderSpriteCard(const Vector &vCenter, float flRadius);

    CUtlString m_VMTName;
    CMaterialReference m_Material;
    CTextureReference m_pLightmapTexture;
    CTextureReference m_DefaultEnvCubemap;
    Vector m_LightDirection;
    Color m_LightColor;
    float m_flLightIntensity;
    Vector m_vecCameraDirection;
    float m_flLastRotationTime;
    bool m_bDrawIn3DMode;
};

#endif  // VMTPREVIEWPANEL_H