added assertion to check that texture width is non-zero

diff --git a/src/mesa/pipe/softpipe/sp_tex_sample.c b/src/mesa/pipe/softpipe/sp_tex_sample.c
index 40350ee..fb4f793 100644 (file)
--- a/src/mesa/pipe/softpipe/sp_tex_sample.c
+++ b/src/mesa/pipe/softpipe/sp_tex_sample.c
@@ -489,6 +489,8 @@ sp_get_sample_2d(struct tgsi_sampler *sampler,
 
    level0 = choose_mipmap_level(sampler, lambda);
 
+   assert(sampler->texture->level[level0].width);
+
    switch (filter) {
    case PIPE_TEX_FILTER_NEAREST:
       {