static void
do_texture_setup(void)
{
GLuint tex;
GLenum target = target_for_sampler[sampler];
pixels = malloc(components * sizeof(unsigned char) * texture_width * texture_height);
expected = malloc(4 * sizeof(float) * texture_width * texture_height);
glGenTextures(1, &tex);
glBindTexture(target, tex);
make_image(components, channel_to_fill());
make_expected();
switch(sampler) {
case SAMPLER_2D:
case SAMPLER_2DRECT:
upload_2d(target, pixels);
break;
case SAMPLER_2DARRAY:
upload_3d(target, NULL);
upload_array_slice(target, 1, pixels);
break;
case SAMPLER_CUBE:
/* legacy cubes are weird. the only sane way to specify the whole
* thing at once is using glTexStorage, and we'd rather not rely on
* ARB_texture_storage just for that. */
upload_2d(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, NULL);
upload_2d(GL_TEXTURE_CUBE_MAP_POSITIVE_X, NULL);
upload_2d(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, NULL);
upload_2d(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, NULL);
upload_2d(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, NULL);
upload_2d(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, pixels);
break;
case SAMPLER_CUBEARRAY:
upload_3d(target, NULL);
upload_array_slice(target, 10, pixels);
break;
}
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
if (comptype == SHADOW_T) {
glTexParameteri(target_for_sampler[sampler], GL_TEXTURE_COMPARE_MODE,
GL_COMPARE_R_TO_TEXTURE);
glTexParameteri(target_for_sampler[sampler], GL_TEXTURE_COMPARE_FUNC,
GL_LESS);
}
glTexParameteri(target_for_sampler[sampler], GL_TEXTURE_WRAP_S, address_mode);
glTexParameteri(target_for_sampler[sampler], GL_TEXTURE_WRAP_T, address_mode);
glTexParameteri(target_for_sampler[sampler], GL_TEXTURE_WRAP_R, address_mode);
}
expected<T> make_expected(optional<T> v) {
if (v) return make_expected(*v);
else make_unexpected(conversion_from_nullopt());
}