/*
   Copyright (C) 1999-2006 Id Software, Inc. and contributors.
   For a list of contributors, see the accompanying CONTRIBUTORS file.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "textures.h"

#include "debugging/debugging.h"
#include "warnings.h"

#include "itextures.h"
#include "igl.h"
#include "preferencesystem.h"
#include "qgl.h"

#include "texturelib.h"
#include "container/hashfunc.h"
#include "container/cache.h"
#include "generic/callback.h"
#include "stringio.h"

#include "image.h"
#include "texmanip.h"
#include "preferences.h"


enum ETexturesMode {
    eTextures_NEAREST = 0,
    eTextures_NEAREST_MIPMAP_NEAREST = 1,
    eTextures_NEAREST_MIPMAP_LINEAR = 2,
    eTextures_LINEAR = 3,
    eTextures_LINEAR_MIPMAP_NEAREST = 4,
    eTextures_LINEAR_MIPMAP_LINEAR = 5,
    eTextures_MAX_ANISOTROPY = 6,
};

enum TextureCompressionFormat {
    TEXTURECOMPRESSION_NONE = 0,
    TEXTURECOMPRESSION_RGBA = 1,
    TEXTURECOMPRESSION_RGBA_S3TC_DXT1 = 2,
    TEXTURECOMPRESSION_RGBA_S3TC_DXT3 = 3,
    TEXTURECOMPRESSION_RGBA_S3TC_DXT5 = 4,
};

struct texture_globals_t {
    // RIANT
    // texture compression format
    TextureCompressionFormat m_nTextureCompressionFormat;

    float fGamma;

    bool bTextureCompressionSupported; // is texture compression supported by hardware?
    GLint texture_components;

    // temporary values that should be initialised only once at run-time
    bool m_bOpenGLCompressionSupported;
    bool m_bS3CompressionSupported;

    texture_globals_t(GLint components) :
            m_nTextureCompressionFormat(TEXTURECOMPRESSION_NONE),
            fGamma(1.0f),
            bTextureCompressionSupported(false),
            texture_components(components),
            m_bOpenGLCompressionSupported(false),
            m_bS3CompressionSupported(false)
    {
    }
};

texture_globals_t g_texture_globals(GL_RGBA);

void SetTexParameters(ETexturesMode mode)
{
    float maxAniso = QGL_maxTextureAnisotropy();
    if (maxAniso > 1) {
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1.0f);
    } else if (mode == eTextures_MAX_ANISOTROPY) {
        mode = eTextures_LINEAR_MIPMAP_LINEAR;
    }

    switch (mode) {
        case eTextures_NEAREST:
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            break;
        case eTextures_NEAREST_MIPMAP_NEAREST:
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            break;
        case eTextures_NEAREST_MIPMAP_LINEAR:
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            break;
        case eTextures_LINEAR:
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            break;
        case eTextures_LINEAR_MIPMAP_NEAREST:
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            break;
        case eTextures_LINEAR_MIPMAP_LINEAR:
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            break;
        case eTextures_MAX_ANISOTROPY:
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, maxAniso);
            break;
        default:
            globalOutputStream() << "invalid texture mode\n";
    }
}

ETexturesMode g_texture_mode = eTextures_LINEAR_MIPMAP_LINEAR;


byte g_gammatable[256];

void ResampleGamma(float fGamma)
{
    int i, inf;
    if (fGamma == 1.0) {
        for (i = 0; i < 256; i++) {
            g_gammatable[i] = i;
        }
    } else {
        for (i = 0; i < 256; i++) {
            inf = (int) (255 * pow(static_cast<double>((i + 0.5) / 255.5 ), static_cast<double>( fGamma )) + 0.5);
            if (inf < 0) {
                inf = 0;
            }
            if (inf > 255) {
                inf = 255;
            }
            g_gammatable[i] = inf;
        }
    }
}

inline const int &min_int(const int &left, const int &right)
{
    return std::min(left, right);
}

int max_tex_size = 0;
const int max_texture_quality = 3;
LatchedValue<int> g_Textures_textureQuality(3, "Texture Quality");

/// \brief This function does the actual processing of raw RGBA data into a GL texture.
/// It will also resample to power-of-two dimensions, generate the mipmaps and adjust gamma.
void LoadTextureRGBA(qtexture_t *q, unsigned char *pPixels, int nWidth, int nHeight)
{
    static float fGamma = -1;
    float total[3];
    byte *outpixels = 0;
    int nCount = nWidth * nHeight;

    if (fGamma != g_texture_globals.fGamma) {
        fGamma = g_texture_globals.fGamma;
        ResampleGamma(fGamma);
    }

    q->width = nWidth;
    q->height = nHeight;

    total[0] = total[1] = total[2] = 0.0f;

    // resample texture gamma according to user settings
    for (int i = 0; i < (nCount * 4); i += 4) {
        for (int j = 0; j < 3; j++) {
            total[j] += (pPixels + i)[j];
            byte b = (pPixels + i)[j];
            (pPixels + i)[j] = g_gammatable[b];
        }
    }

    q->color[0] = total[0] / (nCount * 255);
    q->color[1] = total[1] / (nCount * 255);
    q->color[2] = total[2] / (nCount * 255);

    glGenTextures(1, &q->texture_number);

    glBindTexture(GL_TEXTURE_2D, q->texture_number);

    SetTexParameters(g_texture_mode);

    int gl_width = 1;
    while (gl_width < nWidth) {
        gl_width <<= 1;
    }

    int gl_height = 1;
    while (gl_height < nHeight) {
        gl_height <<= 1;
    }

    bool resampled = false;
    if (!(gl_width == nWidth && gl_height == nHeight)) {
        resampled = true;
        outpixels = (byte *) malloc(gl_width * gl_height * 4);
        R_ResampleTexture(pPixels, nWidth, nHeight, outpixels, gl_width, gl_height, 4);
    } else {
        outpixels = pPixels;
    }

    int quality_reduction = max_texture_quality - g_Textures_textureQuality.m_value;
    int target_width = min_int(gl_width >> quality_reduction, max_tex_size);
    int target_height = min_int(gl_height >> quality_reduction, max_tex_size);

    while (gl_width > target_width || gl_height > target_height) {
        GL_MipReduce(outpixels, outpixels, gl_width, gl_height, target_width, target_height);

        if (gl_width > target_width) {
            gl_width >>= 1;
        }
        if (gl_height > target_height) {
            gl_height >>= 1;
        }
    }

    int mip = 0;
    glTexImage2D(GL_TEXTURE_2D, mip++, g_texture_globals.texture_components, gl_width, gl_height, 0, GL_RGBA,
                 GL_UNSIGNED_BYTE, outpixels);
    while (gl_width > 1 || gl_height > 1) {
        GL_MipReduce(outpixels, outpixels, gl_width, gl_height, 1, 1);

        if (gl_width > 1) {
            gl_width >>= 1;
        }
        if (gl_height > 1) {
            gl_height >>= 1;
        }

        glTexImage2D(GL_TEXTURE_2D, mip++, g_texture_globals.texture_components, gl_width, gl_height, 0, GL_RGBA,
                     GL_UNSIGNED_BYTE, outpixels);
    }

    glBindTexture(GL_TEXTURE_2D, 0);
    if (resampled) {
        free(outpixels);
    }
}

#if 0
/*
   ==============
   Texture_InitPalette
   ==============
 */
void Texture_InitPalette( byte *pal ){
    int r,g,b;
    int i;
    int inf;
    byte gammatable[256];
    float gamma;

    gamma = g_texture_globals.fGamma;

    if ( gamma == 1.0 ) {
        for ( i = 0 ; i < 256 ; i++ )
            gammatable[i] = i;
    }
    else
    {
        for ( i = 0 ; i < 256 ; i++ )
        {
            inf = (int)( 255 * pow( ( i + 0.5 ) / 255.5, gamma ) + 0.5 );
            if ( inf < 0 ) {
                inf = 0;
            }
            if ( inf > 255 ) {
                inf = 255;
            }
            gammatable[i] = inf;
        }
    }

    for ( i = 0 ; i < 256 ; i++ )
    {
        r = gammatable[pal[0]];
        g = gammatable[pal[1]];
        b = gammatable[pal[2]];
        pal += 3;

        //v = (r<<24) + (g<<16) + (b<<8) + 255;
        //v = BigLong (v);

        //tex_palette[i] = v;
        tex_palette[i * 3 + 0] = r;
        tex_palette[i * 3 + 1] = g;
        tex_palette[i * 3 + 2] = b;
    }
}
#endif

#if 0
class TestHashtable
{
public:
TestHashtable(){
    HashTable<CopiedString, CopiedString, HashStringNoCase, StringEqualNoCase> strings;
    strings["Monkey"] = "bleh";
    strings["MonkeY"] = "blah";
}
};

const TestHashtable g_testhashtable;

#endif

typedef std::pair<LoadImageCallback, CopiedString> TextureKey;

void qtexture_realise(qtexture_t &texture, const TextureKey &key)
{
    texture.texture_number = 0;
    if (!string_empty(key.second.c_str())) {
        Image *image = key.first.loadImage(key.second.c_str());
        if (image != 0) {
            LoadTextureRGBA(&texture, image->getRGBAPixels(), image->getWidth(), image->getHeight());
            texture.surfaceFlags = image->getSurfaceFlags();
            texture.contentFlags = image->getContentFlags();
            texture.value = image->getValue();
            image->release();
            globalOutputStream() << "Loaded Texture: \"" << key.second.c_str() << "\"\n";
            GlobalOpenGL_debugAssertNoErrors();
        } else {
            globalErrorStream() << "Texture load failed: \"" << key.second.c_str() << "\"\n";
        }
    }
}

void qtexture_unrealise(qtexture_t &texture)
{
    if (GlobalOpenGL().contextValid && texture.texture_number != 0) {
        glDeleteTextures(1, &texture.texture_number);
        GlobalOpenGL_debugAssertNoErrors();
    }
}

class TextureKeyEqualNoCase {
public:
    bool operator()(const TextureKey &key, const TextureKey &other) const
    {
        return key.first == other.first && string_equal_nocase(key.second.c_str(), other.second.c_str());
    }
};

class TextureKeyHashNoCase {
public:
    typedef hash_t hash_type;

    hash_t operator()(const TextureKey &key) const
    {
        return hash_combine(string_hash_nocase(key.second.c_str()), pod_hash(key.first));
    }
};

#define DEBUG_TEXTURES 0

class TexturesMap : public TexturesCache {
    class TextureConstructor {
        TexturesMap *m_cache;
    public:
        explicit TextureConstructor(TexturesMap *cache)
                : m_cache(cache)
        {
        }

        qtexture_t *construct(const TextureKey &key)
        {
            qtexture_t *texture = new qtexture_t(key.first, key.second.c_str());
            if (m_cache->realised()) {
                qtexture_realise(*texture, key);
            }
            return texture;
        }

        void destroy(qtexture_t *texture)
        {
            if (m_cache->realised()) {
                qtexture_unrealise(*texture);
            }
            delete texture;
        }
    };

    typedef HashedCache<TextureKey, qtexture_t, TextureKeyHashNoCase, TextureKeyEqualNoCase, TextureConstructor> qtextures_t;
    qtextures_t m_qtextures;
    TexturesCacheObserver *m_observer;
    std::size_t m_unrealised;

public:
    virtual ~TexturesMap() = default;

    TexturesMap() : m_qtextures(TextureConstructor(this)), m_observer(0), m_unrealised(1)
    {
    }

    typedef qtextures_t::iterator iterator;

    iterator begin()
    {
        return m_qtextures.begin();
    }

    iterator end()
    {
        return m_qtextures.end();
    }

    LoadImageCallback defaultLoader() const
    {
        return LoadImageCallback(0, QERApp_LoadImage);
    }

    Image *loadImage(const char *name)
    {
        return defaultLoader().loadImage(name);
    }

    qtexture_t *capture(const char *name)
    {
        return capture(defaultLoader(), name);
    }

    qtexture_t *capture(const LoadImageCallback &loader, const char *name)
    {
#if DEBUG_TEXTURES
        globalOutputStream() << "textures capture: " << makeQuoted( name ) << '\n';
#endif
        return m_qtextures.capture(TextureKey(loader, name)).get();
    }

    void release(qtexture_t *texture)
    {
#if DEBUG_TEXTURES
        globalOutputStream() << "textures release: " << makeQuoted( texture->name ) << '\n';
#endif
        m_qtextures.release(TextureKey(texture->load, texture->name));
    }

    void attach(TexturesCacheObserver &observer)
    {
        ASSERT_MESSAGE(m_observer == 0, "TexturesMap::attach: cannot attach observer");
        m_observer = &observer;
    }

    void detach(TexturesCacheObserver &observer)
    {
        ASSERT_MESSAGE(m_observer == &observer, "TexturesMap::detach: cannot detach observer");
        m_observer = 0;
    }

    void realise()
    {
        if (--m_unrealised == 0) {
            g_texture_globals.bTextureCompressionSupported = false;

            if (GlobalOpenGL().ARB_texture_compression()) {
                g_texture_globals.bTextureCompressionSupported = true;
                g_texture_globals.m_bOpenGLCompressionSupported = true;
            }

            if (GlobalOpenGL().EXT_texture_compression_s3tc()) {
                g_texture_globals.bTextureCompressionSupported = true;
                g_texture_globals.m_bS3CompressionSupported = true;
            }

            switch (g_texture_globals.texture_components) {
                case GL_RGBA:
                    break;
                case GL_COMPRESSED_RGBA_ARB:
                    if (!g_texture_globals.m_bOpenGLCompressionSupported) {
                        globalOutputStream()
                                << "OpenGL extension GL_ARB_texture_compression not supported by current graphics drivers\n";
                        g_texture_globals.m_nTextureCompressionFormat = TEXTURECOMPRESSION_NONE;
                        g_texture_globals.texture_components = GL_RGBA;
                    }
                    break;
                case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
                case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
                case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
                    if (!g_texture_globals.m_bS3CompressionSupported) {
                        globalOutputStream()
                                << "OpenGL extension GL_EXT_texture_compression_s3tc not supported by current graphics drivers\n";
                        if (g_texture_globals.m_bOpenGLCompressionSupported) {
                            g_texture_globals.m_nTextureCompressionFormat = TEXTURECOMPRESSION_RGBA;
                            g_texture_globals.texture_components = GL_COMPRESSED_RGBA_ARB;
                        } else {
                            g_texture_globals.m_nTextureCompressionFormat = TEXTURECOMPRESSION_NONE;
                            g_texture_globals.texture_components = GL_RGBA;
                        }
                    }
                    break;
                default:
                    globalOutputStream() << "Unknown texture compression selected, reverting\n";
                    g_texture_globals.m_nTextureCompressionFormat = TEXTURECOMPRESSION_NONE;
                    g_texture_globals.texture_components = GL_RGBA;
                    break;
            }


            glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_tex_size);
            if (max_tex_size == 0) {
                max_tex_size = 1024;
            }

            for (qtextures_t::iterator i = m_qtextures.begin(); i != m_qtextures.end(); ++i) {
                if (!(*i).value.empty()) {
                    qtexture_realise(*(*i).value, (*i).key);
                }
            }
            if (m_observer != 0) {
                m_observer->realise();
            }
        }
    }

    void unrealise()
    {
        if (++m_unrealised == 1) {
            if (m_observer != 0) {
                m_observer->unrealise();
            }
            for (qtextures_t::iterator i = m_qtextures.begin(); i != m_qtextures.end(); ++i) {
                if (!(*i).value.empty()) {
                    qtexture_unrealise(*(*i).value);
                }
            }
        }
    }

    bool realised()
    {
        return m_unrealised == 0;
    }
};

TexturesMap *g_texturesmap;

TexturesCache &GetTexturesCache()
{
    return *g_texturesmap;
}


void Textures_Realise()
{
    g_texturesmap->realise();
}

void Textures_Unrealise()
{
    g_texturesmap->unrealise();
}


Callback<void()> g_texturesModeChangedNotify;

void Textures_setModeChangedNotify(const Callback<void()> &notify)
{
    g_texturesModeChangedNotify = notify;
}

void Textures_ModeChanged()
{
    if (g_texturesmap->realised()) {
        SetTexParameters(g_texture_mode);

        for (TexturesMap::iterator i = g_texturesmap->begin(); i != g_texturesmap->end(); ++i) {
            glBindTexture(GL_TEXTURE_2D, (*i).value->texture_number);
            SetTexParameters(g_texture_mode);
        }

        glBindTexture(GL_TEXTURE_2D, 0);
    }
    g_texturesModeChangedNotify();
}

void Textures_SetMode(ETexturesMode mode)
{
    if (g_texture_mode != mode) {
        g_texture_mode = mode;

        Textures_ModeChanged();
    }
}

void Textures_setTextureComponents(GLint texture_components)
{
    if (g_texture_globals.texture_components != texture_components) {
        Textures_Unrealise();
        g_texture_globals.texture_components = texture_components;
        Textures_Realise();
    }
}

void Textures_UpdateTextureCompressionFormat()
{
    GLint texture_components = GL_RGBA;

    switch (g_texture_globals.m_nTextureCompressionFormat) {
        case (TEXTURECOMPRESSION_NONE): {
            texture_components = GL_RGBA;
            break;
        }
        case (TEXTURECOMPRESSION_RGBA): {
            texture_components = GL_COMPRESSED_RGBA_ARB;
            break;
        }
        case (TEXTURECOMPRESSION_RGBA_S3TC_DXT1): {
            texture_components = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
            break;
        }
        case (TEXTURECOMPRESSION_RGBA_S3TC_DXT3): {
            texture_components = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
            break;
        }
        case (TEXTURECOMPRESSION_RGBA_S3TC_DXT5): {
            texture_components = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
            break;
        }
    }

    Textures_setTextureComponents(texture_components);
}

struct TextureCompression {
    static void Export(const TextureCompressionFormat &self, const Callback<void(int)> &returnz)
    {
        returnz(self);
    }

    static void Import(TextureCompressionFormat &self, int value)
    {
        if (!g_texture_globals.m_bOpenGLCompressionSupported
            && g_texture_globals.m_bS3CompressionSupported
            && value >= 1) {
            ++value;
        }
        switch (value) {
            case 0:
                self = TEXTURECOMPRESSION_NONE;
                break;
            case 1:
                self = TEXTURECOMPRESSION_RGBA;
                break;
            case 2:
                self = TEXTURECOMPRESSION_RGBA_S3TC_DXT1;
                break;
            case 3:
                self = TEXTURECOMPRESSION_RGBA_S3TC_DXT3;
                break;
            case 4:
                self = TEXTURECOMPRESSION_RGBA_S3TC_DXT5;
                break;
        }
        Textures_UpdateTextureCompressionFormat();
    }
};

struct TextureGamma {
    static void Export(const float &self, const Callback<void(float)> &returnz)
    {
        returnz(self);
    }

    static void Import(float &self, float value)
    {
        if (value != self) {
            Textures_Unrealise();
            self = value;
            Textures_Realise();
        }
    }
};

struct TextureMode {
    static void Export(const ETexturesMode &self, const Callback<void(int)> &returnz)
    {
        switch (self) {
            case eTextures_NEAREST:
                returnz(0);
                break;
            case eTextures_NEAREST_MIPMAP_NEAREST:
                returnz(1);
                break;
            case eTextures_LINEAR:
                returnz(2);
                break;
            case eTextures_NEAREST_MIPMAP_LINEAR:
                returnz(3);
                break;
            case eTextures_LINEAR_MIPMAP_NEAREST:
                returnz(4);
                break;
            case eTextures_LINEAR_MIPMAP_LINEAR:
                returnz(5);
                break;
            case eTextures_MAX_ANISOTROPY:
                returnz(6);
                break;
            default:
                returnz(4);
        }
    }

    static void Import(ETexturesMode &self, int value)
    {
        switch (value) {
            case 0:
                Textures_SetMode(eTextures_NEAREST);
                break;
            case 1:
                Textures_SetMode(eTextures_NEAREST_MIPMAP_NEAREST);
                break;
            case 2:
                Textures_SetMode(eTextures_LINEAR);
                break;
            case 3:
                Textures_SetMode(eTextures_NEAREST_MIPMAP_LINEAR);
                break;
            case 4:
                Textures_SetMode(eTextures_LINEAR_MIPMAP_NEAREST);
                break;
            case 5:
                Textures_SetMode(eTextures_LINEAR_MIPMAP_LINEAR);
                break;
            case 6:
                Textures_SetMode(eTextures_MAX_ANISOTROPY);
        }
    }
};

void Textures_constructPreferences(PreferencesPage &page)
{
    {
        const char *percentages[] = {"12.5%", "25%", "50%", "100%",};
        page.appendRadio(
                "Texture Quality",
                STRING_ARRAY_RANGE(percentages),
                make_property(g_Textures_textureQuality)
        );
    }
    page.appendSpinner(
            "Texture Gamma",
            1.0,
            0.0,
            1.0,
            make_property<TextureGamma>(g_texture_globals.fGamma)
    );
    {
        const char *texture_mode[] = {"Nearest", "Nearest Mipmap", "Linear", "Bilinear", "Bilinear Mipmap", "Trilinear",
                                      "Anisotropy"};
        page.appendCombo(
                "Texture Render Mode",
                STRING_ARRAY_RANGE(texture_mode),
                make_property<TextureMode>(g_texture_mode)
        );
    }
    {
        const char *compression_none[] = {"None"};
        const char *compression_opengl[] = {"None", "OpenGL ARB"};
        const char *compression_s3tc[] = {"None", "S3TC DXT1", "S3TC DXT3", "S3TC DXT5"};
        const char *compression_opengl_s3tc[] = {"None", "OpenGL ARB", "S3TC DXT1", "S3TC DXT3", "S3TC DXT5"};
        StringArrayRange compression(
                (g_texture_globals.m_bOpenGLCompressionSupported)
                ? (g_texture_globals.m_bS3CompressionSupported)
                  ? STRING_ARRAY_RANGE(compression_opengl_s3tc)
                  : STRING_ARRAY_RANGE(compression_opengl)
                : (g_texture_globals.m_bS3CompressionSupported)
                  ? STRING_ARRAY_RANGE(compression_s3tc)
                  : STRING_ARRAY_RANGE(compression_none)
        );
        page.appendCombo(
                "Hardware Texture Compression",
                compression,
                make_property<TextureCompression>(g_texture_globals.m_nTextureCompressionFormat)
        );
    }
}

void Textures_constructPage(PreferenceGroup &group)
{
    PreferencesPage page(group.createPage("Textures", "Texture Settings"));
    Textures_constructPreferences(page);
}

void Textures_registerPreferencesPage()
{
    PreferencesDialog_addDisplayPage(makeCallbackF(Textures_constructPage));
}

struct TextureCompressionPreference {
    static void Export(const Callback<void(int)> &returnz)
    {
        returnz(g_texture_globals.m_nTextureCompressionFormat);
    }

    static void Import(int value)
    {
        g_texture_globals.m_nTextureCompressionFormat = static_cast<TextureCompressionFormat>( value );
        Textures_UpdateTextureCompressionFormat();
    }
};

void Textures_Construct()
{
    g_texturesmap = new TexturesMap;

    GlobalPreferenceSystem().registerPreference("TextureCompressionFormat",
                                                make_property_string<TextureCompressionPreference>());
    GlobalPreferenceSystem().registerPreference("TextureFiltering",
                                                make_property_string(reinterpret_cast<int &>( g_texture_mode )));
    GlobalPreferenceSystem().registerPreference("TextureQuality",
                                                make_property_string(g_Textures_textureQuality.m_latched));
    GlobalPreferenceSystem().registerPreference("SI_Gamma", make_property_string(g_texture_globals.fGamma));

    g_Textures_textureQuality.useLatched();

    Textures_registerPreferencesPage();

    Textures_ModeChanged();
}

void Textures_Destroy()
{
    delete g_texturesmap;
}


#include "modulesystem/modulesmap.h"
#include "modulesystem/singletonmodule.h"
#include "modulesystem/moduleregistry.h"

class TexturesDependencies :
        public GlobalRadiantModuleRef,
        public GlobalOpenGLModuleRef,
        public GlobalPreferenceSystemModuleRef {
    ImageModulesRef m_image_modules;
public:
    TexturesDependencies() :
            m_image_modules(GlobalRadiant().getRequiredGameDescriptionKeyValue("texturetypes"))
    {
    }

    ImageModules &getImageModules()
    {
        return m_image_modules.get();
    }
};

class TexturesAPI {
    TexturesCache *m_textures;
public:
    typedef TexturesCache Type;

    STRING_CONSTANT(Name, "*");

    TexturesAPI()
    {
        Textures_Construct();

        m_textures = &GetTexturesCache();
    }

    ~TexturesAPI()
    {
        Textures_Destroy();
    }

    TexturesCache *getTable()
    {
        return m_textures;
    }
};

typedef SingletonModule<TexturesAPI, TexturesDependencies> TexturesModule;
typedef Static<TexturesModule> StaticTexturesModule;
StaticRegisterModule staticRegisterTextures(StaticTexturesModule::instance());

ImageModules &Textures_getImageModules()
{
    return StaticTexturesModule::instance().getDependencies().getImageModules();
}