1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/tex.c	Wed Sep 07 09:03:51 2011 +0300
     1.3 @@ -0,0 +1,57 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <string.h>
     1.7 +#include <errno.h>
     1.8 +#include "opengl.h"
     1.9 +#include "tex.h"
    1.10 +
    1.11 +unsigned int load_texture(const char *fname)
    1.12 +{
    1.13 +	unsigned int tex;
    1.14 +	FILE *fp;
    1.15 +	void *pixels;
    1.16 +	int xsz, ysz, sz;
    1.17 +	char buf[512];
    1.18 +
    1.19 +	if(!(fp = fopen(fname, "r"))) {
    1.20 +		fprintf(stderr, "failed to open texture: %s: %s\n", fname, strerror(errno));
    1.21 +		return 0;
    1.22 +	}
    1.23 +
    1.24 +	if(!fgets(buf, sizeof buf, fp) || buf[0] != 'P' || buf[1] != '6') {
    1.25 +		fprintf(stderr, "invalid format (1): %s\n", fname);
    1.26 +		fclose(fp);
    1.27 +		return 0;
    1.28 +	}
    1.29 +	if(!fgets(buf, sizeof buf, fp) || sscanf(buf, "%d %d", &xsz, &ysz) != 2) {
    1.30 +		fprintf(stderr, "invalid format (2): %s\n", fname);
    1.31 +		fclose(fp);
    1.32 +		return 0;
    1.33 +	}
    1.34 +	fgets(buf, sizeof buf, fp);
    1.35 +
    1.36 +	sz = xsz * ysz * 3;
    1.37 +	if(!(pixels = malloc(sz))) {
    1.38 +		fprintf(stderr, "failed to allocate %d bytes\n", sz);
    1.39 +		fclose(fp);
    1.40 +		return 0;
    1.41 +	}
    1.42 +	if(fread(pixels, 1, xsz * ysz * 3, fp) < sz) {
    1.43 +		fprintf(stderr, "partial read: %s\n", fname);
    1.44 +		free(pixels);
    1.45 +		fclose(fp);
    1.46 +		return 0;
    1.47 +	}
    1.48 +	fclose(fp);
    1.49 +
    1.50 +	glGenTextures(1, &tex);
    1.51 +	glBindTexture(GL_TEXTURE_2D, tex);
    1.52 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    1.53 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    1.54 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    1.55 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    1.56 +	glTexImage2D(GL_TEXTURE_2D, 0, 4, xsz, ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
    1.57 +	free(pixels);
    1.58 +
    1.59 +	return tex;
    1.60 +}