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.

9 files changed, 44 insertions, 45 deletions

diff --git a/src/mesa/pipe/i915simple/i915_state.c b/src/mesa/pipe/i915simple/i915_state.c
index 950ea52d60..abd5571b88 100644
--- a/src/mesa/pipe/i915simple/i915_state.c
+++ b/src/mesa/pipe/i915simple/i915_state.c
@@ -250,6 +250,13 @@ i915_create_sampler_state(struct pipe_context *pipe,
    if (sampler->normalized_coords)
       cso->state[1] |= SS3_NORMALIZED_COORDS;
 
+   if (0) /* XXX not tested yet */
+   {
+      int minlod = (int) (16.0 * sampler->min_lod);
+      minlod = CLAMP(minlod, 0, 16 * 11);
+      cso->state[1] |= (minlod << SS3_MIN_LOD_SHIFT);
+   }
+
    {
       ubyte r = float_to_ubyte(sampler->border_color[0]);
       ubyte g = float_to_ubyte(sampler->border_color[1]);
diff --git a/src/mesa/pipe/i915simple/i915_state_sampler.c b/src/mesa/pipe/i915simple/i915_state_sampler.c
index 0dbbc5241d..9c1a5bbbd6 100644
--- a/src/mesa/pipe/i915simple/i915_state_sampler.c
+++ b/src/mesa/pipe/i915simple/i915_state_sampler.c
@@ -185,7 +185,7 @@ i915_update_texture(struct i915_context *i915, uint unit,
    const struct pipe_texture *pt = &tex->base;
    uint format, pitch;
    const uint width = pt->width[0], height = pt->height[0], depth = pt->depth[0];
-   const uint num_levels = pt->last_level - pt->first_level;
+   const uint num_levels = pt->last_level;
 
    assert(tex);
    assert(width);
diff --git a/src/mesa/pipe/i915simple/i915_texture.c b/src/mesa/pipe/i915simple/i915_texture.c
index 6faeab134a..6d37ae3d74 100644
--- a/src/mesa/pipe/i915simple/i915_texture.c
+++ b/src/mesa/pipe/i915simple/i915_texture.c
@@ -118,11 +118,11 @@ i945_miptree_layout_2d( struct i915_texture *tex )
    tex->pitch = pt->width[0];
 
    /* May need to adjust pitch to accomodate the placement of
-    * the 2nd mipmap.  This occurs when the alignment
+    * the 2nd mipmap level.  This occurs when the alignment
     * constraints of mipmap placement push the right edge of the
-    * 2nd mipmap out past the width of its parent.
+    * 2nd mipmap level out past the width of its parent.
     */
-   if (pt->first_level != pt->last_level) {
+   if (pt->last_level > 0) {
       unsigned mip1_width = align_int(minify(pt->width[0]), align_w)
 			+ minify(minify(pt->width[0]));
 
@@ -136,7 +136,7 @@ i945_miptree_layout_2d( struct i915_texture *tex )
    tex->pitch = align_int(tex->pitch * pt->cpp, 4) / pt->cpp;
    tex->total_height = 0;
 
-   for ( level = pt->first_level ; level <= pt->last_level ; level++ ) {
+   for (level = 0; level <= pt->last_level; level++) {
       unsigned img_height;
 
       i915_miptree_set_level_info(tex, level, 1, x, y, width, height, 1);
@@ -152,9 +152,9 @@ i945_miptree_layout_2d( struct i915_texture *tex )
        */
       tex->total_height = MAX2(tex->total_height, y + img_height);
 
-      /* Layout_below: step right after second mipmap.
+      /* Layout_below: step right after second mipmap level.
        */
-      if (level == pt->first_level + 1) {
+      if (level == 1) {
 	 x += align_int(width, align_w);
       }
       else {
@@ -204,7 +204,7 @@ i915_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
          tex->pitch = ((dim * pt->cpp * 2 + 3) & ~3) / pt->cpp;
          tex->total_height = dim * 4;
 
-         for (level = pt->first_level; level <= pt->last_level; level++) {
+         for (level = 0; level <= pt->last_level; level++) {
             i915_miptree_set_level_info(tex, level, 6,
                                          0, 0,
                                          /*OLD: tex->pitch, tex->total_height,*/
@@ -219,7 +219,7 @@ i915_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
             unsigned y = initial_offsets[face][1] * dim;
             unsigned d = dim;
 
-            for (level = pt->first_level; level <= pt->last_level; level++) {
+            for (level = 0; level <= pt->last_level; level++) {
                i915_miptree_set_image_offset(tex, level, face, x, y);
                d >>= 1;
                x += step_offsets[face][0] * d;
@@ -240,7 +240,7 @@ i915_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
 
          /* XXX: hardware expects/requires 9 levels at minimum.
           */
-         for (level = pt->first_level; level <= MAX2(8, pt->last_level);
+         for (level = 0; level <= MAX2(8, pt->last_level);
               level++) {
             i915_miptree_set_level_info(tex, level, depth, 0, tex->total_height,
                                          width, height, depth);
@@ -256,7 +256,7 @@ i915_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
          /* Fixup depth image_offsets: 
           */
          depth = pt->depth[0];
-         for (level = pt->first_level; level <= pt->last_level; level++) {
+         for (level = 0; level <= pt->last_level; level++) {
             unsigned i;
             for (i = 0; i < depth; i++) 
                i915_miptree_set_image_offset(tex, level, i,
@@ -282,7 +282,7 @@ i915_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
          tex->pitch = ((pt->width[0] * pt->cpp + 3) & ~3) / pt->cpp;
          tex->total_height = 0;
 
-         for (level = pt->first_level; level <= pt->last_level; level++) {
+         for (level = 0; level <= pt->last_level; level++) {
             i915_miptree_set_level_info(tex, level, 1,
                                          0, tex->total_height,
                                          width, height, 1);
@@ -337,7 +337,7 @@ i945_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
 
          /* Set all the levels to effectively occupy the whole rectangular region. 
           */
-         for (level = pt->first_level; level <= pt->last_level; level++) {
+         for (level = 0; level <= pt->last_level; level++) {
             i915_miptree_set_level_info(tex, level, 6,
                                          0, 0,
                                          lvlWidth, lvlHeight, 1);
@@ -355,12 +355,12 @@ i945_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
                y = tex->total_height - 4;
                x = (face - 4) * 8;
             }
-            else if (dim < 4 && (face > 0 || pt->first_level > 0)) {
+            else if (dim < 4 && (face > 0)) {
                y = tex->total_height - 4;
                x = face * 8;
             }
 
-            for (level = pt->first_level; level <= pt->last_level; level++) {
+            for (level = 0; level <= pt->last_level; level++) {
                i915_miptree_set_image_offset(tex, level, face, x, y);
 
                d >>= 1;
@@ -418,7 +418,7 @@ i945_miptree_layout(struct pipe_context *pipe, struct i915_texture * tex)
          pack_x_pitch = tex->pitch;
          pack_x_nr = 1;
 
-         for (level = pt->first_level; level <= pt->last_level; level++) {
+         for (level = 0; level <= pt->last_level; level++) {
             unsigned nr_images = pt->target == PIPE_TEXTURE_3D ? depth : 6;
             int x = 0;
             int y = 0;
diff --git a/src/mesa/pipe/i965simple/brw_tex_layout.c b/src/mesa/pipe/i965simple/brw_tex_layout.c
index 405fd1f794..90561f1307 100644
--- a/src/mesa/pipe/i965simple/brw_tex_layout.c
+++ b/src/mesa/pipe/i965simple/brw_tex_layout.c
@@ -146,7 +146,7 @@ static void i945_miptree_layout_2d(struct brw_texture *tex)
     * constraints of mipmap placement push the right edge of the
     * 2nd mipmap out past the width of its parent.
     */
-   if (pt->first_level != pt->last_level) {
+   if (pt->last_level > 0) {
       unsigned mip1_width;
 
       if (pt->compressed) {
@@ -168,7 +168,7 @@ static void i945_miptree_layout_2d(struct brw_texture *tex)
    tex->pitch = align(tex->pitch * pt->cpp, 4) / pt->cpp;
    tex->total_height = 0;
 
-   for ( level = pt->first_level ; level <= pt->last_level ; level++ ) {
+   for (level = 0; level <= pt->last_level; level++) {
       unsigned img_height;
 
       intel_miptree_set_level_info(tex, level, 1, x, y, width,
@@ -187,7 +187,7 @@ static void i945_miptree_layout_2d(struct brw_texture *tex)
 
       /* Layout_below: step right after second mipmap.
        */
-      if (level == pt->first_level + 1) {
+      if (level == 1) {
 	 x += align(width, align_w);
       }
       else {
@@ -234,7 +234,7 @@ static boolean brw_miptree_layout(struct pipe_context *pipe, struct brw_texture
       pack_x_pitch = tex->pitch;
       pack_x_nr = 1;
 
-      for ( level = pt->first_level ; level <= pt->last_level ; level++ ) {
+      for (level = 0; level <= pt->last_level; level++) {
 	 unsigned nr_images = pt->target == PIPE_TEXTURE_3D ? depth : 6;
 	 int x = 0;
 	 int y = 0;
diff --git a/src/mesa/pipe/i965simple/brw_wm_surface_state.c b/src/mesa/pipe/i965simple/brw_wm_surface_state.c
index cbb4f2efd3..d16d919bce 100644
--- a/src/mesa/pipe/i965simple/brw_wm_surface_state.c
+++ b/src/mesa/pipe/i965simple/brw_wm_surface_state.c
@@ -154,7 +154,7 @@ void brw_update_texture_surface( struct brw_context *brw,
    /* Updated in emit_reloc */
    surf.ss1.base_addr = brw_buffer_offset( brw, tObj->buffer );
 
-   surf.ss2.mip_count = tObj->base.last_level - tObj->base.first_level;
+   surf.ss2.mip_count = tObj->base.last_level;
    surf.ss2.width = tObj->base.width[0] - 1;
    surf.ss2.height = tObj->base.height[0] - 1;
 
diff --git a/src/mesa/pipe/p_state.h b/src/mesa/pipe/p_state.h
index 83ca43f678..4d3a6b2f41 100644
--- a/src/mesa/pipe/p_state.h
+++ b/src/mesa/pipe/p_state.h
@@ -234,14 +234,9 @@ struct pipe_sampler_state
    unsigned compare_mode:1;  /**< PIPE_TEX_COMPARE_x */
    unsigned compare_func:3;  /**< PIPE_FUNC_x */
    unsigned normalized_coords:1;  /**< Are coords normalized to [0,1]? */
-   float shadow_ambient; /**< shadow test fail color/intensity */
-   float min_lod;
-   float max_lod;
-   float lod_bias;
-#if 0 /* need these? */
-   int BaseLevel;     /**< min mipmap level, OpenGL 1.2 */
-   int MaxLevel;      /**< max mipmap level, OpenGL 1.2 */
-#endif
+   float shadow_ambient;          /**< shadow test fail color/intensity */
+   float lod_bias;                /**< LOD/lambda bias */
+   float min_lod, max_lod;        /**< LOD clamp range, after bias */
    float border_color[4];
    float max_anisotropy;
 };
@@ -277,8 +272,7 @@ struct pipe_texture
    enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
    enum pipe_format format;         /**< PIPE_FORMAT_x */
 
-   unsigned first_level;
-   unsigned last_level;
+   unsigned last_level;    /**< Index of last mipmap level present/defined */
 
    unsigned width[PIPE_MAX_TEXTURE_LEVELS];
    unsigned height[PIPE_MAX_TEXTURE_LEVELS];
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);