/*
 *  mogltk
 *  Copyright (C) 1999-2004 Nicolas "Pixel" Noble
 *
 *  This program 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.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* $Id: texture.cc,v 1.9 2004-07-15 14:21:31 pixel Exp $ */

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

#define DEBUG 1

mogltk::texture * mogltk::texture::header = 0;
mogltk::texture * mogltk::texture::footer = 0;

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

mogltk::texture::texture(int w, int h, bool plane) throw (GeneralException) : width(w), height(h),
    texture_allocated(false), planar(plane), tainted(true), taintable(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"));
    }
    
    SDL_FillRect(surface, 0, 0);
    
    next = 0;
    prev = footer;
    footer = this;
    if (!header) {
	header = this;
    }
    if (prev) {
	prev->next = this;
    }
}

mogltk::texture::texture(Handle * h, bool plane) throw (GeneralException) :
    texture_allocated(false), planar(plane), tainted(true), taintable(true) {

    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);

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

inline static unsigned int nextpower(unsigned int n) {
    unsigned int i;

    if (!n)
        return n;

    if (ISPOT(n))
        return n;

    for (i = 31; i >= 0; i--) {
        if ((n >> i) & 1) {
            return 1 << (i + 1);
        }
    }
}

mogltk::texture::texture(int x, int y, int w, int h) : width(nextpower(w)), height(nextpower(h)),
    texture_allocated(true), planar(false), tainted(false), taintable(false) {
    glGenTextures(1, &tex);
    glBindTexture(GL_TEXTURE_2D, tex);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, x, y, w, h);
}

mogltk::texture::~texture() {
    if (surface) {
	SDL_FreeSurface(surface);
    }
    
    if (texture_allocated) {
	glDeleteTextures(1, &tex);
    }
    
    if (prev) {
	prev->next = next;
    }
    
    if (next) {
	next->prev = prev;
    }
    
    if (this == footer) {
	footer = prev;
    }
    
    if (this == header) {
	header = next;
    }
}

Uint32 * mogltk::texture::GetPixels() {
    if (surface)
        return (Uint32 *) surface->pixels;
    else
        return 0;
}

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

SDL_PixelFormat * mogltk::texture::GetFormat() {
    if (surface)
        return surface->format;
    else
        return 0;
}

void mogltk::texture::Generate() {
    if (texture_allocated) {
	glDeleteTextures(1, &tex);
    }
    
    glGenTextures(1, &tex);
#ifdef DEBUG
    printm(M_INFO, _("Generated texture index: %i\n"), tex);
#endif

    glBindTexture(GL_TEXTURE_2D, tex);

#if 0
    if (planar) {
#ifdef DEBUG
	printm(M_INFO, _("Generating planar texture: %i\n"), tex);
#endif
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels);
    } else {
#endif
#ifdef DEBUG
	printm(M_INFO, _("Generating 3D texture: %i\n"), tex);
#endif
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, width, height, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels);
//	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels);	
#if 0
    }
#endif

    texture_allocated = true;
    tainted = false;
}

void mogltk::texture::Bind(bool expand) {
    if ((!texture_allocated) || tainted)
	Generate();
    glEnable(GL_TEXTURE_2D);
    if (active == this)
	return;
    glBindTexture(GL_TEXTURE_2D, tex);
    if (expand) {
	glMatrixMode(GL_TEXTURE);
	glLoadIdentity();
	glScaled(1 / (double) width, 1 / (double) height, 1);
	glMatrixMode(GL_MODELVIEW);
    }
    
    active = this;
    
    if (header == this)
	return;
    
    if (prev) {
	prev->next = next;
    }
    
    if (next) {
	next->prev = prev;
    }
    
    if (footer = this) {
	footer = prev;
    }
    
    next = header;
    prev = 0;
    header->prev = this;
    header = this;
}

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

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

void mogltk::texture::Unbind(void) {
    if (active) {
	glBindTexture(GL_TEXTURE_2D, 0);
	glDisable(GL_TEXTURE_2D);
	active = 0;
    }
}

void mogltk::texture::Taint(void) {
    if (taintable)
        tainted = true;
}

void mogltk::texture::Taintall(void) {
    if (header)
        header->recTaint();
}

void mogltk::texture::recTaint(void) {
    Taint();
    if (next)
        next->recTaint();
}

#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[5];
    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;
}

void mogltk::texture::DumpBMP(const String & n) {
    if (surface)
        SDL_SaveBMP(surface, n.to_charp());
}