libsegl/gltexture.cpp

/* libsegl - Sebas Extended GL Library
 *           Collection of Opengl/3D-Math helpers
 *
 *      Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
 *      http://www.seba-geek.de
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * 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
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */

#include "gltexture.h"

namespace segl {

GLTexture::GLTexture() {
	init();
	alltextures.push_back(this);
}

GLTexture::GLTexture(std::string fname, GLint _minfilter, GLint _magfilter, GLint _wraps, GLint _wrapt) {
	init();
	setParameter(_minfilter, _magfilter, _wraps, _wrapt);
	loadImage(fname);
	filename = fname;
	
	alltextures.push_back(this);
}

GLTexture::GLTexture(SDL_Surface *srfc) {
	init();
	loadSurface(srfc);
}

void GLTexture::init() {
	loaded = false;
	texconverted = false;
	keepsurface = false;
	donotreload = false;
	
	minfilter = GL_LINEAR;
	magfilter = GL_LINEAR;
	
	wraps = GL_REPEAT;
	wrapt = GL_REPEAT;
	
	tex = 0;
	width = height = 0;
}

bool GLTexture::loadLocalSurface() {
	if(!texconverted)
		convertLocalSurface();
	
	width  = tex->w;
	height = tex->h;
	
	glGenTextures(1, &texint);
	glBindTexture(GL_TEXTURE_2D, texint);
	
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minfilter);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magfilter);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wraps);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapt);

	gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA8, width, height, GL_BGRA, GL_UNSIGNED_BYTE, tex->pixels);
	
	loaded = true;
	
	return true;
}

void GLTexture::convertLocalSurface() {
	tex = SDL_DisplayFormatAlpha(tex);
	mirrorSurfaceMiddleX(tex);
	
	texconverted = true;
}

bool GLTexture::loadImage(std::string fname) {
	if(isLoaded())
		unloadTexture();
	filename = fname;
	tex = IMG_Load(filename.c_str());
	
	if(!tex) {
		std::cerr << "Textur konnte nicht geladen werden: " << filename << std::endl;
		return false;
	}
	
	bool ret = loadLocalSurface();
	keepsurface = false;
	SDL_FreeSurface(tex);
	tex = 0;
	
	return ret;
}

bool GLTexture::loadSurface(SDL_Surface *srfc, bool noreloading) {
	if(isLoaded())
		unloadTexture();
	if(filename!="")
		filename = "";
	
	tex = srfc;
	
	keepsurface = true;
	donotreload = noreloading;
	
	return loadLocalSurface();
}

bool GLTexture::selectTexture() {
	if(!loaded) {
		std::cerr << "Textur wurde nicht geladen: " << filename << std::endl;
		return false;
	}
	
	glBindTexture(GL_TEXTURE_2D, texint);
	
	return true;
}

void GLTexture::unloadTexture() {
	glDeleteTextures(1, &texint);
	
	loaded = false;
	// Entweder tex == image, wurde schon gel<65>scht oder wir m<>ssen es nich l<>schen

}

bool GLTexture::setParameter(GLint _minfilter, GLint _magfilter, GLint _wraps, GLint _wrapt) {
	if(_minfilter!=0)
		minfilter = _minfilter;
	if(_magfilter!=0)
		magfilter = _magfilter;
	if(_wraps!=0)
		wraps = _wraps;
	if(_wrapt!=0)
		wrapt = _wrapt;
	
	if(!loaded)
		return true;
	
	loaded = false;
	texconverted = false;
	
	if(keepsurface&&tex!=0) {
		unloadTexture();
		return loadLocalSurface();
	} else if(filename!="") {
		//std::cout << "Filename: " << filename << std::endl;
		return loadImage(filename);
	} else {
		// keine datei, kein surface
		unloadTexture();
		std::cerr << "Couldn't reload GLTexture " << this << "- No surface, no file!" << std::endl;
		return false;
	}
	//std::cout << "Texture reloaded" << std::endl;
}

int GLTexture::getW() {
	return width;	
}

int GLTexture::getH() {
	return height;	
}

bool GLTexture::isLoaded() {
	return loaded;
}

void GLTexture::reloadAll() {
	for(unsigned int i=0; i<alltextures.size(); i++) {
		alltextures[i]->setParameter();
	}
}

GLTexture::~GLTexture() {
	if(isLoaded())
		unloadTexture();
		
	for(unsigned int i=0; i<alltextures.size(); i++) {
		if(alltextures[i]==this) {
			alltextures.erase(alltextures.begin()+i);
		}
	}
}

std::vector<GLTexture*> GLTexture::alltextures;

} // namespace segl