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#include <assert.h>
#include <png.h>
#include <stdlib.h>
#include "eprintf.h"
#include "tex.h"
GLuint png2tex(FILE *f)
{
png_image pi = { .version = PNG_IMAGE_VERSION };
unsigned char *data;
size_t size;
GLuint id;
assert(f != NULL);
png_image_begin_read_from_stdio(&pi, f);
pi.format = PNG_FORMAT_RGB;
size = sizeof *data * 3 * pi.width * pi.height;
data = emalloc(size);
png_image_finish_read(&pi, NULL, data, size / pi.height, NULL);
gl_tex_gen(1, &id);
gl_tex_bind(GL_TEXTURE_2D, id);
gl_tex_parami(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl_tex_parami(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
gl_tex_parami(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
gl_tex_parami(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
gl_tex_img2d(GL_TEXTURE_2D, 0, GL_RGB, pi.width, pi.height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
gl_tex_genmip(GL_TEXTURE_2D);
free(data);
png_image_free(&pi);
return id;
}
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