//========= Copyright (c) 1996-2007, Valve Corporation, All rights reserved. ============//

#ifndef ICESURFACE_HELPER_H
#define ICESURFACE_HELPER_H
#ifdef _WIN32
#pragma once
#endif

#include <string.h>

//-----------------------------------------------------------------------------
// Forward declarations
//-----------------------------------------------------------------------------
class CBaseVSShader;
class IMaterialVar;
class IShaderDynamicAPI;
class IShaderShadow;

//-----------------------------------------------------------------------------
// Struct to hold shader param indices
//-----------------------------------------------------------------------------
struct IceSurfaceVars_t
{
	IceSurfaceVars_t()
	{
		memset( this, 0xFF, sizeof( IceSurfaceVars_t ) );
	}

	int m_nBackSurface;
	int m_nBumpStrength;
	int m_nFresnelBumpStrength;
	int m_nNormalMap;
	int m_nBaseTexture;
	int m_nLightWarpTexture;
	int m_nFresnelWarpTexture;
	int m_nOpacityTexture;
	int m_nSpecMap;
	int m_nUVScale;
	int m_nEnvMap;

	int m_nInteriorEnable;
	int m_nInteriorFogStrength;
	int m_nInteriorFogLimit;
	int m_nInteriorFogNormalBoost;
	int m_nInteriorBackgroundBoost;
	int m_nInteriorAmbientScale;
	int m_nInteriorBackLightScale;
	int m_nInteriorColor;
	int m_nInteriorRefractStrength;
	int m_nInteriorRefractBlur;

	int m_nFresnelParams;
	int m_nDiffuseScale;
	int m_nSpecExp;
	int m_nSpecScale;
	int m_nSpecExp2;
	int m_nSpecScale2;
	int m_nRimLightExp;
	int m_nRimLightScale;
	int m_nBaseColorTint;
	int m_nEnvMapTint;
	int m_nUVProjOffset;
	int m_nBBMin;
	int m_nBBMax;
	int m_nFlashlightTexture;
	int m_nFlashlightTextureFrame;
	int m_nBumpFrame;
	int m_nContactShadows;
};

// default shader param values
static const int   kDefaultBackSurface = 0;
static const float kDefaultBumpStrength = 1.0f;
static const float kDefaultFresnelBumpStrength = 1.0f;
static const float kDefaultUVScale = 0.02f;

static const int   kDefaultInteriorEnable = 1;
static const float kDefaultInteriorFogStrength = 0.06f;
static const float kDefaultInteriorFogLimit = 0.8f;
static const float kDefaultInteriorFogNormalBoost = 0.0f;
static const float kDefaultInteriorBackgroundBoost = 0.0f;
static const float kDefaultInteriorAmbientScale = 0.3f;
static const float kDefaultInteriorBackLightScale = 0.3f;
static const float kDefaultInteriorColor[3] = { 0.5f, 0.5f, 0.5f };
static const float kDefaultInteriorRefractStrength = 0.015f;
static const float kDefaultInteriorRefractBlur = 0.2f;

static const float kDefaultFresnelParams[3] = { 0.0f, 0.5f, 2.0f };
static const float kDefaultBaseColorTint[3] = { 1.0f, 1.0f, 1.0f };
static const float kDefaultEnvMapTint[3] = { 1.0f, 1.0f, 1.0f };
static const float kDefaultDiffuseScale = 1.0f;
static const float kDefaultSpecExp = 1.0f;
static const float kDefaultSpecScale = 1.0f;
static const float kDefaultRimLightExp = 10.0f;
static const float kDefaultRimLightScale = 1.0f;
static const float kDefaultUVProjOffset[3] = { 0.0f, 0.0f, 0.0f };
static const float kDefaultBB[3] = { 0.0f, 0.0f, 0.0f };

static const int   kDefaultBumpFrame = 0;
static const int   kDefaultContactShadows = 0;

void InitParamsIceSurface( CBaseVSShader *pShader, IMaterialVar** params, const char *pMaterialName, IceSurfaceVars_t &info );
void InitIceSurface( CBaseVSShader *pShader, IMaterialVar** params, IceSurfaceVars_t &info );
void DrawIceSurface( CBaseVSShader *pShader, IMaterialVar** params, IShaderDynamicAPI *pShaderAPI,
					 IShaderShadow* pShaderShadow, IceSurfaceVars_t &info, VertexCompressionType_t vertexCompression );

#endif // ICESURFACE_HELPER_H