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nuclear@2
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1 /*
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2 Stereoscopic tunnel for iOS.
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3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 #include <stdio.h>
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20 #include <stdlib.h>
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21 #include <string.h>
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22 #include <errno.h>
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23 #include "opengl.h"
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24 #include "tex.h"
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25 #include "config.h"
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26 #include "imago2.h"
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27
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28 unsigned int load_texture(const char *fname)
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29 {
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30 int xsz, ysz;
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31 unsigned int tex;
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32 void *pixels;
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33
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34 if(!fname) {
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35 return 0;
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36 }
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37 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
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38 fprintf(stderr, "failed to load image: %s\n", fname);
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39 return 0;
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40 }
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41
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42 glGenTextures(1, &tex);
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43 glBindTexture(GL_TEXTURE_2D, tex);
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44 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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45 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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46 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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47 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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48 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
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49 img_free_pixels(pixels);
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50
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51 return tex;
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52 }
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53
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54 void bind_texture(unsigned int tex, int unit)
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55 {
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56 glActiveTexture(GL_TEXTURE0 + unit);
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57
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58 #ifndef IPHONE
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59 if(tex) {
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60 glEnable(GL_TEXTURE_2D);
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61 } else {
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62 glDisable(GL_TEXTURE_2D);
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63 }
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64 #endif
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65
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66 glBindTexture(GL_TEXTURE_2D, tex);
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67 }
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