#include <sys/types.h>
#include <SDL.h>
#include <generic.h>
#include "texture.h"
#include "engine.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gettext.h"

#ifdef TRACE_TEXTURES
mogltk::texture * mogltk::texture::header = 0;
mogltk::texture * mogltk::texture::footer = 0;
#endif

mogltk::texture * mogltk::texture::active = 0;

mogltk::texture::texture(int w, int h) throw (GeneralException) : width(w), height(h),
    texture_allocated(false), planar(plane), tainted(true) {
    if ((!ISPOT(w)) || (!ISPOT(h)))
	throw GeneralException(_("Size of the texture not a power of 2!"));
    
    if (!(surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	0xff000000,
	0x00ff0000,
	0x0000ff00,
	0x000000ff
#else
	0x000000ff,
	0x0000ff00,
	0x00ff0000,
	0xff000000
#endif
    ))) {
	throw GeneralException(_("Can't create RGB Surface"));
    }
    
#ifdef TRACE_TEXTURES
    next = 0;
    prev = footer;
    footer = this;
    if (!header) {
	header = this;
    }
    if (prev) {
	prev->next = this;
    }
#endif
}

mogltk::texture::texture(Handle * h) throw (GeneralException) {
    SDL_Surface * temp;
    
    temp = LoadNTEX(h);
    width = temp->w;
    height = temp->h;

#ifdef DEBUG
    printm(M_INFO, "Creating texture from file: size %ix%i\n", height, width);
#endif

    if ((!ISPOT(width)) || (!ISPOT(height))) {
	SDL_FreeSurface(temp);
	throw GeneralException(_("Size of the texture not a power of 2!"));
    }

    SDL_PixelFormat f;

    f.palette = 0;
    f.BitsPerPixel = 32;
    f.BytesPerPixel = 4;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
    f.Amask = 0x000000ff;
    f.Bmask = 0x0000ff00;
    f.Gmask = 0x00ff0000;
    f.Rmask = 0xff000000;
    f.Ashift = 0;
    f.Bshift = 8;
    f.Gshift = 16;
    f.Rshift = 24;
#else
    f.Rmask = 0x000000ff;
    f.Gmask = 0x0000ff00;
    f.Bmask = 0x00ff0000;
    f.Amask = 0xff000000;
    f.Rshift = 0;
    f.Gshift = 8;
    f.Bshift = 16;
    f.Ashift = 24;
#endif
    f.Rloss = 0;
    f.Gloss = 0;
    f.Bloss = 0;
    f.Aloss = 0;

    if (!(surface = SDL_ConvertSurface(temp, &f, 0))) {
	throw GeneralException("Could not convert texture to OpenGL format");
    }
    
    SDL_FreeSurface(temp);

#ifdef TRACE_TEXTURES
    next = 0;
    prev = footer;
    footer = this;
    if (!header) {
	header = this;
    }
    if (prev) {
	prev->next = this;
    }
#endif
}

mogltk::texture::~texture() {
    if (surface) {
	SDL_FreeSurface(surface);
    }
    
#ifdef TRACE_TEXTURES
    if (prev) {
	prev->next = next;
    }
    
    if (next) {
	next->prev = prev;
    }
    
    if (this == footer) {
	footer = prev;
    }
    
    if (this == header) {
	header = next;
    }
#endif
}

Uint32 * mogltk::texture::GetPixels() {
    return (Uint32 *) surface->pixels;
}

SDL_Surface * mogltk::texture::GetSurface() {
    return surface;
}

Uint32 mogltk::texture::GetWidth() {
    return width;
}

Uint32 mogltk::texture::GetHeight() {
    return height;
}

#ifdef WORDS_BIGENDIAN
#define NTEX_SIGNATURE 0x4e544558
#else
#define NTEX_SIGNATURE 0x5845544e
#endif

SDL_Surface * mogltk::texture::LoadNTEX(Handle * h) throw (GeneralException) {
    SDL_Surface * r;
    char buffer[4];
    Uint16 height, width;
    
    h->read(buffer, 4);
    buffer[4] = 0;
    if (*((Uint32 *) buffer) != NTEX_SIGNATURE)
	throw GeneralException("Texture file " + h->GetName() + " corrupted");
    
    height = h->readU16();
    width = h->readU16();
    
    if (!(r = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
	0xff000000,
	0x00ff0000,
	0x0000ff00,
	0x000000ff
#else
	0x000000ff,
	0x0000ff00,
	0x00ff0000,
	0xff000000
#endif
    ))) {
	throw GeneralException(_("Can't create RGB Surface for LoadNTEX"));
    }
    
    h->read(r->pixels, height * width * 4);
    
    return r;
}