nuclear@14: #include <stdio.h>
nuclear@14: #include <stdlib.h>
nuclear@14: #include <string.h>
nuclear@14: #include <errno.h>
nuclear@14: #include "opengl.h"
nuclear@14: #include "tex.h"
nuclear@15: #include "config.h"
nuclear@14: 
nuclear@14: unsigned int load_texture(const char *fname)
nuclear@14: {
nuclear@14: 	unsigned int tex;
nuclear@14: 	FILE *fp;
nuclear@25: 	unsigned char *pixels;
nuclear@25: 	int xsz, ysz, sz, i;
nuclear@14: 	char buf[512];
nuclear@14: 
nuclear@14: 	if(!(fp = fopen(fname, "r"))) {
nuclear@14: 		fprintf(stderr, "failed to open texture: %s: %s\n", fname, strerror(errno));
nuclear@14: 		return 0;
nuclear@14: 	}
nuclear@14: 
nuclear@14: 	if(!fgets(buf, sizeof buf, fp) || buf[0] != 'P' || buf[1] != '6') {
nuclear@14: 		fprintf(stderr, "invalid format (1): %s\n", fname);
nuclear@14: 		fclose(fp);
nuclear@14: 		return 0;
nuclear@14: 	}
nuclear@14: 	if(!fgets(buf, sizeof buf, fp) || sscanf(buf, "%d %d", &xsz, &ysz) != 2) {
nuclear@14: 		fprintf(stderr, "invalid format (2): %s\n", fname);
nuclear@14: 		fclose(fp);
nuclear@14: 		return 0;
nuclear@14: 	}
nuclear@14: 	fgets(buf, sizeof buf, fp);
nuclear@14: 
nuclear@25: 	sz = xsz * ysz * 4;
nuclear@14: 	if(!(pixels = malloc(sz))) {
nuclear@14: 		fprintf(stderr, "failed to allocate %d bytes\n", sz);
nuclear@14: 		fclose(fp);
nuclear@14: 		return 0;
nuclear@14: 	}
nuclear@25: 	for(i=0; i<sz; i++) {
nuclear@25: 		int c;
nuclear@25: 
nuclear@25: 		if(i % 4 == 3) {
nuclear@25: 			pixels[i] = 255;
nuclear@25: 			continue;
nuclear@25: 		}
nuclear@25: 
nuclear@25: 		if((c = fgetc(fp)) == -1) {
nuclear@25: 			fprintf(stderr, "partial read: %s\n", fname);
nuclear@25: 			free(pixels);
nuclear@25: 			fclose(fp);
nuclear@25: 			return 0;
nuclear@25: 		}
nuclear@25: 		pixels[i] = c;
nuclear@14: 	}
nuclear@14: 	fclose(fp);
nuclear@14: 
nuclear@14: 	glGenTextures(1, &tex);
nuclear@14: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@14: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
nuclear@14: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
nuclear@14: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@14: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@25: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@14: 	free(pixels);
nuclear@14: 
nuclear@14: 	return tex;
nuclear@14: }
nuclear@15: 
nuclear@15: void bind_texture(unsigned int tex, int unit)
nuclear@15: {
nuclear@15: 	glActiveTexture(GL_TEXTURE0 + unit);
nuclear@15: 
nuclear@15: #ifndef IPHONE
nuclear@15: 	if(tex) {
nuclear@15: 		glEnable(GL_TEXTURE_2D);
nuclear@15: 	} else {
nuclear@15: 		glDisable(GL_TEXTURE_2D);
nuclear@15: 	}
nuclear@15: #endif
nuclear@15: 
nuclear@15: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@15: }