gallium: clean-up, simplification of mipmapped textures

Remove pipe_texture->first_level (always implicitly zero).  This means there's
never any unused mipmap levels at the top.
In the state tracker, we no longer re-layout mipmapped textures if the
MinLod/MaxLod texture parameters change.  It's up to the driver to obey the
pipe_sampler->min/max_lod clamps.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/mesa/pipe/softpipe/sp_texture.c b/src/mesa/pipe/softpipe/sp_texture.c
index fd2cc3dbbb..6de7a9b543 100644
--- a/src/mesa/pipe/softpipe/sp_texture.c
+++ b/src/mesa/pipe/softpipe/sp_texture.c
@@ -61,7 +61,7 @@ softpipe_texture_layout(struct softpipe_texture * spt)
 
    spt->buffer_size = 0;
 
-   for ( level = pt->first_level ; level <= pt->last_level ; level++ ) {
+   for (level = 0; level <= pt->last_level; level++) {
       pt->width[level] = width;
       pt->height[level] = height;
       pt->depth[level] = depth;
@@ -139,6 +139,8 @@ softpipe_get_tex_surface(struct pipe_context *pipe,
    struct softpipe_texture *spt = softpipe_texture(pt);
    struct pipe_surface *ps;
 
+   assert(level <= pt->last_level);
+
    ps = pipe->winsys->surface_alloc(pipe->winsys);
    if (ps) {
       assert(ps->refcount);