nuclear@2: /*
nuclear@2: Stereoscopic tunnel for iOS.
nuclear@24: Copyright (C) 2011-2015 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@24: #include "assman.h"
nuclear@24: 
nuclear@24: static size_t ioread(void *buf, size_t bytes, void *uptr);
nuclear@24: static long ioseek(long offs, int whence, void *uptr);
nuclear@2: 
nuclear@2: unsigned int load_texture(const char *fname)
nuclear@2: {
nuclear@2: 	unsigned int tex;
nuclear@24: 	ass_file *fp;
nuclear@24: 	struct img_io io;
nuclear@24: 	struct img_pixmap img;
nuclear@2: 
nuclear@2: 	if(!fname) {
nuclear@2: 		return 0;
nuclear@2: 	}
nuclear@24: 	if(!(fp = ass_fopen(fname, "rb"))) {
nuclear@24: 		fprintf(stderr, "failed to open texture file: %s: %s\n", fname, strerror(errno));
nuclear@2: 		return 0;
nuclear@2: 	}
nuclear@24: 	io.uptr = fp;
nuclear@24: 	io.read = ioread;
nuclear@24: 	io.write = 0;
nuclear@24: 	io.seek = ioseek;
nuclear@24: 
nuclear@24: 	img_init(&img);
nuclear@24: 	if(img_read(&img, &io) == -1) {
nuclear@24: 		fprintf(stderr, "failed to load image: %s\n", fname);
nuclear@24: 		ass_fclose(fp);
nuclear@24: 		return 0;
nuclear@24: 	}
nuclear@24: 	ass_fclose(fp);
nuclear@24: 	img_convert(&img, IMG_FMT_RGBA32);
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@24: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@24: 
nuclear@24: #ifdef __GLEW_H__
nuclear@24: 	if(GLEW_SGIS_generate_mipmap) {
nuclear@24: 		glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
nuclear@24: #endif
nuclear@24: 		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img.width, img.height, 0,
nuclear@24: 				GL_RGBA, GL_UNSIGNED_BYTE, img.pixels);
nuclear@24: #ifdef __GLEW_H__
nuclear@24: 	} else {
nuclear@24: 		gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, img.width, img.height,
nuclear@24: 				GL_RGBA, GL_UNSIGNED_BYTE, img.pixels);
nuclear@24: 	}
nuclear@24: #endif
nuclear@24: 
nuclear@24: #ifdef GL_ES_VERSION_2_0
nuclear@24: 	glGenerateMipmap(GL_TEXTURE_2D);
nuclear@24: #endif
nuclear@24: 	img_destroy(&img);
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@24: #ifndef GL_ES_VERSION_2_0
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: }
nuclear@24: 
nuclear@24: static size_t ioread(void *buf, size_t bytes, void *uptr)
nuclear@24: {
nuclear@24: 	return ass_fread(buf, 1, bytes, uptr);
nuclear@24: }
nuclear@24: 
nuclear@24: static long ioseek(long offs, int whence, void *uptr)
nuclear@24: {
nuclear@24: 	return ass_fseek(uptr, offs, whence);
nuclear@24: }