nuclear@2: /*
nuclear@2: Stereoscopic tunnel for iOS.
nuclear@2: Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
nuclear@2: 
nuclear@2: This program is free software: you can redistribute it and/or modify
nuclear@2: it under the terms of the GNU General Public License as published by
nuclear@2: the Free Software Foundation, either version 3 of the License, or
nuclear@2: (at your option) any later version.
nuclear@2: 
nuclear@2: This program is distributed in the hope that it will be useful,
nuclear@2: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@2: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@2: GNU General Public License for more details.
nuclear@2: 
nuclear@2: You should have received a copy of the GNU General Public License
nuclear@2: along with this program.  If not, see <http://www.gnu.org/licenses/>.
nuclear@2: */
nuclear@2: 
nuclear@2: #include <stdio.h>
nuclear@2: #include <stdlib.h>
nuclear@2: #include <string.h>
nuclear@2: #include <errno.h>
nuclear@2: #include "opengl.h"
nuclear@2: #include "tex.h"
nuclear@2: #include "config.h"
nuclear@2: #include "imago2.h"
nuclear@2: 
nuclear@2: unsigned int load_texture(const char *fname)
nuclear@2: {
nuclear@2: 	int xsz, ysz;
nuclear@2: 	unsigned int tex;
nuclear@2: 	void *pixels;
nuclear@2: 
nuclear@2: 	if(!fname) {
nuclear@2: 		return 0;
nuclear@2: 	}
nuclear@2: 	if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@2: 		fprintf(stderr, "failed to load image: %s\n", fname);
nuclear@2: 		return 0;
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glGenTextures(1, &tex);
nuclear@2: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@2: 	img_free_pixels(pixels);
nuclear@2: 
nuclear@2: 	return tex;
nuclear@2: }
nuclear@2: 
nuclear@2: void bind_texture(unsigned int tex, int unit)
nuclear@2: {
nuclear@2: 	glActiveTexture(GL_TEXTURE0 + unit);
nuclear@2: 
nuclear@2: #ifndef IPHONE
nuclear@2: 	if(tex) {
nuclear@2: 		glEnable(GL_TEXTURE_2D);
nuclear@2: 	} else {
nuclear@2: 		glDisable(GL_TEXTURE_2D);
nuclear@2: 	}
nuclear@2: #endif
nuclear@2: 
nuclear@2: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@2: }