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.

3 files changed, 12 insertions, 14 deletions

diff --git a/src/mesa/pipe/softpipe/sp_state_sampler.c b/src/mesa/pipe/softpipe/sp_state_sampler.c
index 291bbc40ad..6a5a643c89 100644
--- a/src/mesa/pipe/softpipe/sp_state_sampler.c
+++ b/src/mesa/pipe/softpipe/sp_state_sampler.c
@@ -34,6 +34,8 @@
 #include "sp_state.h"
 #include "sp_texture.h"
 #include "sp_tile_cache.h"
+#include "pipe/draw/draw_context.h"
+
 
 
 void *
@@ -73,6 +75,8 @@ softpipe_set_sampler_texture(struct pipe_context *pipe,
 {
    struct softpipe_context *softpipe = softpipe_context(pipe);
 
+   draw_flush(softpipe->draw);
+
    assert(unit < PIPE_MAX_SAMPLERS);
    softpipe->texture[unit] = softpipe_texture(texture);  /* ptr, not struct */
 
diff --git a/src/mesa/pipe/softpipe/sp_tex_sample.c b/src/mesa/pipe/softpipe/sp_tex_sample.c
index 5e215c433a..325bdb86da 100644
--- a/src/mesa/pipe/softpipe/sp_tex_sample.c
+++ b/src/mesa/pipe/softpipe/sp_tex_sample.c
@@ -449,7 +449,6 @@ compute_lambda(struct tgsi_sampler *sampler,
    }
 
    lambda = LOG2(rho);
-
    lambda += lodbias + sampler->state->lod_bias;
    lambda = CLAMP(lambda, sampler->state->min_lod, sampler->state->max_lod);
 
@@ -457,7 +456,6 @@ compute_lambda(struct tgsi_sampler *sampler,
 }
 
 
-
 /**
  * Do several things here:
  * 1. Compute lambda from the texcoords, if needed
@@ -477,7 +475,7 @@ choose_mipmap_levels(struct tgsi_sampler *sampler,
    if (sampler->state->min_mip_filter == PIPE_TEX_MIPFILTER_NONE) {
       /* no mipmap selection needed */
       *imgFilter = sampler->state->mag_img_filter;
-      *level0 = *level1 = sampler->texture->first_level;
+      *level0 = *level1 = (int) sampler->state->min_lod;
    }
    else {
       float lambda;
@@ -492,7 +490,7 @@ choose_mipmap_levels(struct tgsi_sampler *sampler,
       if (lambda < 0.0) { /* XXX threshold depends on the filter */
          /* magnifying */
          *imgFilter = sampler->state->mag_img_filter;
-         *level0 = *level1 = sampler->texture->first_level;
+         *level0 = *level1 = 0;
       }
       else {
          /* minifying */
@@ -503,19 +501,13 @@ choose_mipmap_levels(struct tgsi_sampler *sampler,
             /* Nearest mipmap level */
             const int lvl = (int) (lambda + 0.5);
             *level0 =
-            *level1 = CLAMP(lvl,
-                            (int) sampler->texture->first_level,
-                            (int) sampler->texture->last_level);
+            *level1 = CLAMP(lvl, 0, (int) sampler->texture->last_level);
          }
          else {
             /* Linear interpolation between mipmap levels */
             const int lvl = (int) lambda;
-            *level0 = CLAMP(lvl,
-                            (int) sampler->texture->first_level,
-                            (int) sampler->texture->last_level);
-            *level1 = CLAMP(lvl + 1,
-                            (int) sampler->texture->first_level,
-                            (int) sampler->texture->last_level);
+            *level0 = CLAMP(lvl,     0, (int) sampler->texture->last_level);
+            *level1 = CLAMP(lvl + 1, 0, (int) sampler->texture->last_level);
             *levelBlend = FRAC(lambda);  /* blending weight between levels */
          }
       }
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);