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#include "texture.h"
i32
load_texture(struct arena *arena, struct texture *texture, const char *filename, i32 gamma)
{
stbi_set_flip_vertically_on_load(1);
i32 nchannels;
u8 *data = stbi_load(filename, &texture->width, &texture->height, &nchannels, 0);
if (!data) {
info("failed to load \"%s\"", filename);
return 0;
}
u32 internal_format, data_format;
switch (nchannels) {
case 1:
texture->type = texture_r;
internal_format = data_format = gl_red;
break;
case 3:
texture->type = texture_rgb;
internal_format = gamma ? gl_srgb : gl_rgb;
data_format = gl_rgb;
break;
case 4:
texture->type = texture_rgba;
internal_format = gamma ? gl_srgb_alpha : gl_rgba;
data_format = gl_rgba;
break;
default:
printf("\"%s\" unsupported texture format %i", filename, nchannels);
return 0;
}
u64 size = texture->type * texture->width * texture->height;
texture->data = push_arena(arena, size);
memmove(texture->data, data, size);
stbi_image_free(data);
gl_gen_textures(1, &texture->id);
gl_bind_texture(gl_texture_2d, texture->id);
gl_tex_image_2d(gl_texture_2d, 0, internal_format, texture->width,
texture->height, 0, data_format, gl_unsigned_byte,
texture->data);
gl_gen_mipmap(gl_texture_2d);
gl_tex_parami(gl_texture_2d, gl_texture_wrap_s, gl_repeat);
gl_tex_parami(gl_texture_2d, gl_texture_wrap_t, gl_repeat);
gl_tex_parami(gl_texture_2d, gl_texture_min_filter, gl_linear_mipmap_linear);
gl_tex_parami(gl_texture_2d, gl_texture_mag_filter, gl_linear);
gl_bind_texture(gl_texture_2d, 0);
info("\"%s\" loaded successfully", filename);
return texture->id;
}
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