st/mesa: set sampler_view::last_level correctly

It was set to pipe_resource::last_level and _MaxLevel was embedded in max_lod,
that's why it worked for ordinary texturing. However, min_lod doesn't have
any effect on texelFetch and textureQueryLevels, so we must still set
last_level correctly.

Reviewed-by: Roland Scheidegger <[email protected]>

2 files changed, 12 insertions, 6 deletions

diff --git a/src/mesa/state_tracker/st_atom_sampler.c b/src/mesa/state_tracker/st_atom_sampler.c
index 3929251f83a..17b536bf504 100644
--- a/src/mesa/state_tracker/st_atom_sampler.c
+++ b/src/mesa/state_tracker/st_atom_sampler.c
@@ -160,11 +160,8 @@ convert_sampler(struct st_context *st,
 
    sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
 
-   sampler->min_lod = CLAMP(msamp->MinLod,
-                            0.0f,
-                            (GLfloat) texobj->MaxLevel - texobj->BaseLevel);
-   sampler->max_lod = MIN2((GLfloat) texobj->MaxLevel - texobj->BaseLevel,
-                           msamp->MaxLod);
+   sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
+   sampler->max_lod = msamp->MaxLod;
    if (sampler->max_lod < sampler->min_lod) {
       /* The GL spec doesn't seem to specify what to do in this case.
        * Swap the values.
diff --git a/src/mesa/state_tracker/st_atom_texture.c b/src/mesa/state_tracker/st_atom_texture.c
index f34a5986308..2e10bc3e241 100644
--- a/src/mesa/state_tracker/st_atom_texture.c
+++ b/src/mesa/state_tracker/st_atom_texture.c
@@ -212,6 +212,12 @@ check_sampler_swizzle(const struct st_texture_object *stObj,
 }
 
 
+static unsigned last_level(struct st_texture_object *stObj)
+{
+   return MIN2(stObj->base._MaxLevel, stObj->pt->last_level);
+}
+
+
 static struct pipe_sampler_view *
 st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
 					  struct st_texture_object *stObj,
@@ -244,6 +250,8 @@ st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
       templ.u.buf.last_element  = f + (n - 1);
    } else {
       templ.u.tex.first_level = stObj->base.BaseLevel;
+      templ.u.tex.last_level = last_level(stObj);
+      assert(templ.u.tex.first_level <= templ.u.tex.last_level);
    }
 
    if (swizzle != SWIZZLE_NOOP) {
@@ -279,7 +287,8 @@ st_get_texture_sampler_view_from_stobj(struct st_context *st,
    if (*sv) {
       if (check_sampler_swizzle(stObj, *sv) ||
 	  (format != (*sv)->format) ||
-	  stObj->base.BaseLevel != (*sv)->u.tex.first_level) {
+          stObj->base.BaseLevel != (*sv)->u.tex.first_level ||
+          last_level(stObj) != (*sv)->u.tex.last_level) {
 	 pipe_sampler_view_reference(sv, NULL);
       }
    }