/**
 * @file llmaterial.cpp
 * @brief Material definition
 *
 * $LicenseInfo:firstyear=2006&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library 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;
 * version 2.1 of the License only.
 * 
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llmaterial.h"

/**
 * Materials cap parameters
 */
#define MATERIALS_CAP_NORMAL_MAP_FIELD            "NormMap"
#define MATERIALS_CAP_NORMAL_MAP_OFFSET_X_FIELD   "NormOffsetX"
#define MATERIALS_CAP_NORMAL_MAP_OFFSET_Y_FIELD   "NormOffsetY"
#define MATERIALS_CAP_NORMAL_MAP_REPEAT_X_FIELD   "NormRepeatX"
#define MATERIALS_CAP_NORMAL_MAP_REPEAT_Y_FIELD   "NormRepeatY"
#define MATERIALS_CAP_NORMAL_MAP_ROTATION_FIELD   "NormRotation"

#define MATERIALS_CAP_SPECULAR_MAP_FIELD          "SpecMap"
#define MATERIALS_CAP_SPECULAR_MAP_OFFSET_X_FIELD "SpecOffsetX"
#define MATERIALS_CAP_SPECULAR_MAP_OFFSET_Y_FIELD "SpecOffsetY"
#define MATERIALS_CAP_SPECULAR_MAP_REPEAT_X_FIELD "SpecRepeatX"
#define MATERIALS_CAP_SPECULAR_MAP_REPEAT_Y_FIELD "SpecRepeatY"
#define MATERIALS_CAP_SPECULAR_MAP_ROTATION_FIELD "SpecRotation"

#define MATERIALS_CAP_SPECULAR_COLOR_FIELD        "SpecColor"
#define MATERIALS_CAP_SPECULAR_EXP_FIELD          "SpecExp"
#define MATERIALS_CAP_ENV_INTENSITY_FIELD         "EnvIntensity"
#define MATERIALS_CAP_ALPHA_MASK_CUTOFF_FIELD     "AlphaMaskCutoff"
#define MATERIALS_CAP_DIFFUSE_ALPHA_MODE_FIELD    "DiffuseAlphaMode"

constexpr F32	DEFAULT_SPECULAR_LIGHT_EXPONENT = 0.2f;
constexpr F32   DEFAULT_ENV_INTENSITY = 0.f;
const LLColor4	DEFAULT_SPECULAR_LIGHT_COLOR(1.f, 1.f, 1.f, 1.f);

/**
 * Materials constants
 */

const F32 MATERIALS_MULTIPLIER                   = 10000.f;

/**
 * Helper functions
 */

template<typename T> T getMaterialField(const LLSD& data, const std::string& field, const LLSD::Type field_type)
{
    if ( (data.has(field)) && (field_type == data[field].type()) )
    {
        return (T)data[field];
    }
    LL_ERRS() << "Missing or mistyped field '" << field << "' in material definition" << LL_ENDL;
    return (T)LLSD();
}

// GCC didn't like the generic form above for some reason
template<> LLUUID getMaterialField(const LLSD& data, const std::string& field, const LLSD::Type field_type)
{
    if ( (data.has(field)) && (field_type == data[field].type()) )
    {
        return data[field].asUUID();
    }
    LL_ERRS() << "Missing or mistyped field '" << field << "' in material definition" << LL_ENDL;
    return LLUUID::null;
}

/**
 * LLMaterial class
 */

const LLMaterial LLMaterial::null;

LLMaterial::LLMaterial()
    : mNormalOffsetX(0.0f)
    , mNormalOffsetY(0.0f)
    , mNormalRepeatX(1.0f)
    , mNormalRepeatY(1.0f)
    , mNormalRotation(0.0f)
    , mSpecularOffsetX(0.0f)
    , mSpecularOffsetY(0.0f)
    , mSpecularRepeatX(1.0f)
    , mSpecularRepeatY(1.0f)
    , mSpecularRotation(0.0f)
    , mSpecularLightColor(DEFAULT_SPECULAR_LIGHT_COLOR)
    , mSpecularLightExponent(DEFAULT_SPECULAR_LIGHT_EXPONENT)
    , mEnvironmentIntensity(DEFAULT_ENV_INTENSITY)
    , mDiffuseAlphaMode(LLMaterial::DIFFUSE_ALPHA_MODE_BLEND)
    , mAlphaMaskCutoff(0.0f)
{
}

LLMaterial::LLMaterial(const LLSD& material_data)
{
    fromLLSD(material_data);
}

const LLUUID& LLMaterial::getNormalID() const
{
    return mNormalID;
}

void LLMaterial::setNormalID(const LLUUID& normal_id)
{
    mNormalID = normal_id;
}

void LLMaterial::getNormalOffset(F32& offset_x, F32& offset_y) const
{
    offset_x = mNormalOffsetX;
    offset_y = mNormalOffsetY;
}

F32 LLMaterial::getNormalOffsetX() const
{
    return mNormalOffsetX;
}

F32 LLMaterial::getNormalOffsetY() const
{
    return mNormalOffsetY;
}

void LLMaterial::setNormalOffset(F32 offset_x, F32 offset_y)
{
    mNormalOffsetX = offset_x;
    mNormalOffsetY = offset_y;
}

void LLMaterial::setNormalOffsetX(F32 offset_x)
{
    mNormalOffsetX = offset_x;
}

void LLMaterial::setNormalOffsetY(F32 offset_y)
{
    mNormalOffsetY = offset_y;
}

void LLMaterial::getNormalRepeat(F32& repeat_x, F32& repeat_y) const
{
    repeat_x = mNormalRepeatX;
    repeat_y = mNormalRepeatY;
}

F32 LLMaterial::getNormalRepeatX() const
{
    return mNormalRepeatX;
}

F32 LLMaterial::getNormalRepeatY() const
{
    return mNormalRepeatY;
}

void LLMaterial::setNormalRepeat(F32 repeat_x, F32 repeat_y)
{
    mNormalRepeatX = repeat_x;
    mNormalRepeatY = repeat_y;
}

void LLMaterial::setNormalRepeatX(F32 repeat_x)
{
    mNormalRepeatX = repeat_x;
}

void LLMaterial::setNormalRepeatY(F32 repeat_y)
{
    mNormalRepeatY = repeat_y;
}

F32 LLMaterial::getNormalRotation() const
{
    return mNormalRotation;
}

void LLMaterial::setNormalRotation(F32 rot)
{
    mNormalRotation = rot;
}

const LLUUID& LLMaterial::getSpecularID() const
{
    return mSpecularID;
}

void LLMaterial::setSpecularID(const LLUUID& specular_id)
{
    mSpecularID = specular_id;
}

void LLMaterial::getSpecularOffset(F32& offset_x, F32& offset_y) const
{
    offset_x = mSpecularOffsetX;
    offset_y = mSpecularOffsetY;
}

F32 LLMaterial::getSpecularOffsetX() const
{
    return mSpecularOffsetX;
}

F32 LLMaterial::getSpecularOffsetY() const
{
    return mSpecularOffsetY;
}

void LLMaterial::setSpecularOffset(F32 offset_x, F32 offset_y)
{
    mSpecularOffsetX = offset_x;
    mSpecularOffsetY = offset_y;
}

void LLMaterial::setSpecularOffsetX(F32 offset_x)
{
    mSpecularOffsetX = offset_x;
}

void LLMaterial::setSpecularOffsetY(F32 offset_y)
{
    mSpecularOffsetY = offset_y;
}

void LLMaterial::getSpecularRepeat(F32& repeat_x, F32& repeat_y) const
{
    repeat_x = mSpecularRepeatX;
    repeat_y = mSpecularRepeatY;
}

F32 LLMaterial::getSpecularRepeatX() const
{
    return mSpecularRepeatX;
}

F32 LLMaterial::getSpecularRepeatY() const
{
    return mSpecularRepeatY;
}

void LLMaterial::setSpecularRepeat(F32 repeat_x, F32 repeat_y)
{
    mSpecularRepeatX = repeat_x; mSpecularRepeatY = repeat_y;
}

void LLMaterial::setSpecularRepeatX(F32 repeat_x)
{
    mSpecularRepeatX = repeat_x;
}

void LLMaterial::setSpecularRepeatY(F32 repeat_y)
{
    mSpecularRepeatY = repeat_y;
}

F32 LLMaterial::getSpecularRotation() const
{
    return mSpecularRotation;
}

void LLMaterial::setSpecularRotation(F32 rot)
{
    mSpecularRotation = rot;
}

const LLColor4& LLMaterial::getSpecularLightColor() const
{
    return mSpecularLightColor;
}

void LLMaterial::setSpecularLightColor(const LLColor4& color)
{
    mSpecularLightColor = color;
}

F32 LLMaterial::getSpecularLightExponent() const
{
    return mSpecularLightExponent;
}

void LLMaterial::setSpecularLightExponent(F32 exponent)
{
    mSpecularLightExponent = exponent;
}

F32 LLMaterial::getEnvironmentIntensity() const
{
    return mEnvironmentIntensity;
}

void LLMaterial::setEnvironmentIntensity(F32 intensity)
{
    mEnvironmentIntensity = intensity;
}

U8 LLMaterial::getDiffuseAlphaMode() const
{
    return mDiffuseAlphaMode;
}

void LLMaterial::setDiffuseAlphaMode(U8 alpha_mode)
{
    mDiffuseAlphaMode = alpha_mode;
}

F32 LLMaterial::getAlphaMaskCutoff() const
{
    return mAlphaMaskCutoff;
}

void LLMaterial::setAlphaMaskCutoff(F32 cutoff)
{
    mAlphaMaskCutoff = cutoff;
}

LLSD LLMaterial::asLLSD() const
{
    LLSD material_data;

    S32 normalOffsetXInt = ll_round(mNormalOffsetX  * MATERIALS_MULTIPLIER);
    S32 normalOffsetYInt = ll_round(mNormalOffsetY  * MATERIALS_MULTIPLIER);
    S32 normalRotInt     = ll_round(mNormalRotation * MATERIALS_MULTIPLIER);

    material_data[MATERIALS_CAP_NORMAL_MAP_FIELD] = mNormalID;
    material_data[MATERIALS_CAP_NORMAL_MAP_OFFSET_X_FIELD] = normalOffsetXInt;
    material_data[MATERIALS_CAP_NORMAL_MAP_OFFSET_Y_FIELD] = normalOffsetYInt;
    material_data[MATERIALS_CAP_NORMAL_MAP_REPEAT_X_FIELD] = ll_round(mNormalRepeatX * MATERIALS_MULTIPLIER);
    material_data[MATERIALS_CAP_NORMAL_MAP_REPEAT_Y_FIELD] = ll_round(mNormalRepeatY * MATERIALS_MULTIPLIER);
    material_data[MATERIALS_CAP_NORMAL_MAP_ROTATION_FIELD] = normalRotInt;

    material_data[MATERIALS_CAP_SPECULAR_MAP_FIELD] = mSpecularID;

    S32 specularOffsetXInt = ll_round(mSpecularOffsetX  * MATERIALS_MULTIPLIER);
    S32 specularOffsetYInt = ll_round(mSpecularOffsetY  * MATERIALS_MULTIPLIER);
    S32 specularRotInt     = ll_round(mSpecularRotation * MATERIALS_MULTIPLIER);

    material_data[MATERIALS_CAP_SPECULAR_MAP_OFFSET_X_FIELD] = specularOffsetXInt;
    material_data[MATERIALS_CAP_SPECULAR_MAP_OFFSET_Y_FIELD] = specularOffsetYInt;
    material_data[MATERIALS_CAP_SPECULAR_MAP_REPEAT_X_FIELD] = ll_round(mSpecularRepeatX * MATERIALS_MULTIPLIER);
    material_data[MATERIALS_CAP_SPECULAR_MAP_REPEAT_Y_FIELD] = ll_round(mSpecularRepeatY * MATERIALS_MULTIPLIER);
    material_data[MATERIALS_CAP_SPECULAR_MAP_ROTATION_FIELD] = specularRotInt;

    material_data[MATERIALS_CAP_SPECULAR_COLOR_FIELD]     = LLColor4U(mSpecularLightColor).getValue();
    material_data[MATERIALS_CAP_SPECULAR_EXP_FIELD]       = llclampb(ll_round(mSpecularLightExponent * 255.f));
    material_data[MATERIALS_CAP_ENV_INTENSITY_FIELD]      = llclampb(ll_round(mEnvironmentIntensity * 255.f));
    material_data[MATERIALS_CAP_DIFFUSE_ALPHA_MODE_FIELD] = mDiffuseAlphaMode;
    material_data[MATERIALS_CAP_ALPHA_MASK_CUTOFF_FIELD]  = llclampb(ll_round(mAlphaMaskCutoff * 255.f));

    return material_data;
}

void LLMaterial::fromLLSD(const LLSD& material_data)
{
    mNormalID = getMaterialField<LLSD::UUID>(material_data, MATERIALS_CAP_NORMAL_MAP_FIELD, LLSD::TypeUUID);

    S32 normalOffsetXInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_NORMAL_MAP_OFFSET_X_FIELD, LLSD::TypeInteger);
    S32 normalOffsetYInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_NORMAL_MAP_OFFSET_Y_FIELD, LLSD::TypeInteger);
    S32 normalRotInt     = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_NORMAL_MAP_ROTATION_FIELD, LLSD::TypeInteger);
    S32 normalRepeatXInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_NORMAL_MAP_REPEAT_X_FIELD, LLSD::TypeInteger);
    S32 normalRepeatYInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_NORMAL_MAP_REPEAT_Y_FIELD, LLSD::TypeInteger);

    mNormalOffsetX  = F32(normalOffsetXInt) / MATERIALS_MULTIPLIER;
    mNormalOffsetY  = F32(normalOffsetYInt) / MATERIALS_MULTIPLIER;
    mNormalRotation = F32(normalRotInt)     / MATERIALS_MULTIPLIER;
    mNormalRepeatX  = F32(normalRepeatXInt) / MATERIALS_MULTIPLIER;
    mNormalRepeatY  = F32(normalRepeatYInt) / MATERIALS_MULTIPLIER;

    mSpecularID = getMaterialField<LLSD::UUID>(material_data, MATERIALS_CAP_SPECULAR_MAP_FIELD, LLSD::TypeUUID);

    S32 specularOffsetXInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_SPECULAR_MAP_OFFSET_X_FIELD, LLSD::TypeInteger);
    S32 specularOffsetYInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_SPECULAR_MAP_OFFSET_Y_FIELD, LLSD::TypeInteger);
    S32 specularRotInt     = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_SPECULAR_MAP_ROTATION_FIELD, LLSD::TypeInteger);
    S32 specularRepeatXInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_SPECULAR_MAP_REPEAT_X_FIELD, LLSD::TypeInteger);
    S32 specularRepeatYInt = getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_SPECULAR_MAP_REPEAT_Y_FIELD, LLSD::TypeInteger);

    mSpecularOffsetX   = F32(specularOffsetXInt) / MATERIALS_MULTIPLIER;
    mSpecularOffsetY   = F32(specularOffsetYInt) / MATERIALS_MULTIPLIER;
    mSpecularRotation  = F32(specularRotInt)     / MATERIALS_MULTIPLIER;
    mSpecularRepeatX  = F32(specularRepeatXInt) / MATERIALS_MULTIPLIER;
    mSpecularRepeatY  = F32(specularRepeatYInt) / MATERIALS_MULTIPLIER;

	LLColor4U specularLightColorInt(getMaterialField<LLSD>(material_data, MATERIALS_CAP_SPECULAR_COLOR_FIELD, LLSD::TypeArray));
	U8 specularLightExponentInt = (U8)getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_SPECULAR_EXP_FIELD, LLSD::TypeInteger);
	U8 environmentIntensityInt = (U8)getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_ENV_INTENSITY_FIELD, LLSD::TypeInteger);
	U8 alphaMaskCutoffInt = (U8)getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_ALPHA_MASK_CUTOFF_FIELD, LLSD::TypeInteger);

	mSpecularLightColor = specularLightColorInt;
    mSpecularLightExponent = specularLightExponentInt * (1.f / 255.f);
    mEnvironmentIntensity  = environmentIntensityInt * (1.f / 255.f);
    mDiffuseAlphaMode      = (U8)getMaterialField<LLSD::Integer>(material_data, MATERIALS_CAP_DIFFUSE_ALPHA_MODE_FIELD, LLSD::TypeInteger);
    mAlphaMaskCutoff       = alphaMaskCutoffInt * (1.f / 255.f);
}

bool LLMaterial::isNull() const
{
    return (*this == null);
}

bool LLMaterial::operator == (const LLMaterial& rhs) const
{
    return 
        (mNormalID == rhs.mNormalID) && (mNormalOffsetX == rhs.mNormalOffsetX) && (mNormalOffsetY == rhs.mNormalOffsetY) &&
        (mNormalRepeatX == rhs.mNormalRepeatX) && (mNormalRepeatY == rhs.mNormalRepeatY) && (mNormalRotation == rhs.mNormalRotation) &&
        (mSpecularID == rhs.mSpecularID) && (mSpecularOffsetX == rhs.mSpecularOffsetX) && (mSpecularOffsetY == rhs.mSpecularOffsetY) &&
        (mSpecularRepeatX == rhs.mSpecularRepeatX) && (mSpecularRepeatY == rhs.mSpecularRepeatY) && (mSpecularRotation == rhs.mSpecularRotation) &&
        (mSpecularLightColor == rhs.mSpecularLightColor) && (mSpecularLightExponent == rhs.mSpecularLightExponent) &&
        (mEnvironmentIntensity == rhs.mEnvironmentIntensity) && (mDiffuseAlphaMode == rhs.mDiffuseAlphaMode) && (mAlphaMaskCutoff == rhs.mAlphaMaskCutoff);
}

bool LLMaterial::operator != (const LLMaterial& rhs) const
{
    return !(*this == rhs);
}


U32 LLMaterial::getShaderMask(U32 alpha_mode)
{ //NEVER incorporate this value into the message system -- this function will vary depending on viewer implementation
    U32 ret = 0;

    //two least significant bits are "diffuse alpha mode"
    if (alpha_mode != DIFFUSE_ALPHA_MODE_DEFAULT)
    {
        ret = alpha_mode;
    }
    else
    {
        ret = getDiffuseAlphaMode();
    }

    llassert(ret < SHADER_COUNT);

    //next bit is whether or not specular map is present
    const U32 SPEC_BIT = 0x4;

    if (getSpecularID().notNull())
    {
        ret |= SPEC_BIT;
    }

    llassert(ret < SHADER_COUNT);
    
    //next bit is whether or not normal map is present
    const U32 NORM_BIT = 0x8;
    if (getNormalID().notNull())
    {
        ret |= NORM_BIT;
    }

    llassert(ret < SHADER_COUNT);

    return ret;
}


