remove texture towerwip/tower

9 files changed, 4 insertions, 779 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 638a3cddb..eec0537e3 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -65,8 +65,6 @@ libmutter_la_SOURCES =				\
 	compositor/meta-shaped-texture.c	\
 	compositor/meta-texture-rectangle.c	\
 	compositor/meta-texture-rectangle.h	\
-	compositor/meta-texture-tower.c		\
-	compositor/meta-texture-tower.h		\
 	compositor/meta-window-actor.c		\
 	compositor/meta-window-actor-private.h	\
 	compositor/meta-window-group.c		\
diff --git a/src/compositor/README b/src/compositor/README
deleted file mode 100644
index b6308f69f..000000000
--- a/src/compositor/README
+++ /dev/null
@@ -1,10 +0,0 @@
-Intro
-=====
-
-Fix me.
-
-
-Env Vars
-========
-
-MUTTER_DISABLE_MIPMAPS - set to disable use of mipmaped windows.
\ No newline at end of file
diff --git a/src/compositor/compositor-private.h b/src/compositor/compositor-private.h
index 0ebf3a439..85045a218 100644
--- a/src/compositor/compositor-private.h
+++ b/src/compositor/compositor-private.h
@@ -31,7 +31,6 @@ struct _MetaCompositor
   guint           server_time_is_monotonic_time : 1;
   guint           show_redraw : 1;
   guint           debug       : 1;
-  guint           no_mipmaps  : 1;
 };
 
 struct _MetaCompScreen
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index 9a864448e..6484b2e8b 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -1532,9 +1532,6 @@ meta_compositor_new (MetaDisplay *display)
 
   compositor->display = display;
 
-  if (g_getenv("META_DISABLE_MIPMAPS"))
-    compositor->no_mipmaps = TRUE;
-
   meta_verbose ("Creating %d atoms\n", (int) G_N_ELEMENTS (atom_names));
   XInternAtoms (xdisplay, atom_names, G_N_ELEMENTS (atom_names),
                 False, atoms);
diff --git a/src/compositor/meta-shaped-texture.c b/src/compositor/meta-shaped-texture.c
index c6239c9d2..ddd40cbdd 100644
--- a/src/compositor/meta-shaped-texture.c
+++ b/src/compositor/meta-shaped-texture.c
@@ -30,7 +30,6 @@
 #include <config.h>
 
 #include <meta/meta-shaped-texture.h>
-#include "meta-texture-tower.h"
 
 #include <clutter/clutter.h>
 #include <cogl/cogl.h>
@@ -64,7 +63,6 @@ G_DEFINE_TYPE (MetaShapedTexture, meta_shaped_texture,
 
 struct _MetaShapedTexturePrivate
 {
-  MetaTextureTower *paint_tower;
   Pixmap pixmap;
   CoglTexturePixmapX11 *texture;
   CoglTexture *mask_texture;
@@ -74,8 +72,6 @@ struct _MetaShapedTexturePrivate
   cairo_region_t *clip_region;
 
   guint tex_width, tex_height;
-
-  guint create_mipmaps : 1;
 };
 
 static void
@@ -102,10 +98,8 @@ meta_shaped_texture_init (MetaShapedTexture *self)
 
   priv = self->priv = META_SHAPED_TEXTURE_GET_PRIVATE (self);
 
-  priv->paint_tower = meta_texture_tower_new ();
   priv->texture = NULL;
   priv->mask_texture = NULL;
-  priv->create_mipmaps = TRUE;
 }
 
 static void
@@ -114,10 +108,6 @@ meta_shaped_texture_dispose (GObject *object)
   MetaShapedTexture *self = (MetaShapedTexture *) object;
   MetaShapedTexturePrivate *priv = self->priv;
 
-  if (priv->paint_tower)
-    meta_texture_tower_free (priv->paint_tower);
-  priv->paint_tower = NULL;
-
   g_clear_pointer (&priv->pipeline, cogl_object_unref);
   g_clear_pointer (&priv->pipeline_unshaped, cogl_object_unref);
   g_clear_pointer (&priv->texture, cogl_object_unref);
@@ -133,7 +123,6 @@ meta_shaped_texture_paint (ClutterActor *actor)
 {
   MetaShapedTexture *stex = (MetaShapedTexture *) actor;
   MetaShapedTexturePrivate *priv = stex->priv;
-  CoglTexture *paint_tex;
   guint tex_width, tex_height;
   ClutterActorBox alloc;
 
@@ -148,29 +137,6 @@ meta_shaped_texture_paint (ClutterActor *actor)
   if (!CLUTTER_ACTOR_IS_REALIZED (CLUTTER_ACTOR (stex)))
     clutter_actor_realize (CLUTTER_ACTOR (stex));
 
-  /* The GL EXT_texture_from_pixmap extension does allow for it to be
-   * used together with SGIS_generate_mipmap, however this is very
-   * rarely supported. Also, even when it is supported there
-   * are distinct performance implications from:
-   *
-   *  - Updating mipmaps that we don't need
-   *  - Having to reallocate pixmaps on the server into larger buffers
-   *
-   * So, we just unconditionally use our mipmap emulation code. If we
-   * wanted to use SGIS_generate_mipmap, we'd have to  query COGL to
-   * see if it was supported (no API currently), and then if and only
-   * if that was the case, set the clutter texture quality to HIGH.
-   * Setting the texture quality to high without SGIS_generate_mipmap
-   * support for TFP textures will result in fallbacks to XGetImage.
-   */
-  if (priv->create_mipmaps)
-    paint_tex = meta_texture_tower_get_paint_texture (priv->paint_tower);
-  else
-    paint_tex = COGL_TEXTURE (priv->texture);
-
-  if (paint_tex == NULL)
-    return;
-
   tex_width = priv->tex_width;
   tex_height = priv->tex_height;
 
@@ -212,7 +178,10 @@ meta_shaped_texture_paint (ClutterActor *actor)
       cogl_pipeline_set_layer_texture (pipeline, 1, priv->mask_texture);
     }
 
-  cogl_pipeline_set_layer_texture (pipeline, 0, paint_tex);
+  cogl_pipeline_set_layer_filters (pipeline, 0,
+                                   COGL_PIPELINE_FILTER_LINEAR_MIPMAP_LINEAR,
+                                   COGL_PIPELINE_FILTER_LINEAR);
+  cogl_pipeline_set_layer_texture (pipeline, 0, priv->texture);
 
   {
     CoglColor color;
@@ -374,28 +343,6 @@ meta_shaped_texture_new (void)
 }
 
 void
-meta_shaped_texture_set_create_mipmaps (MetaShapedTexture *stex,
-					gboolean           create_mipmaps)
-{
-  MetaShapedTexturePrivate *priv;
-
-  g_return_if_fail (META_IS_SHAPED_TEXTURE (stex));
-
-  priv = stex->priv;
-
-  create_mipmaps = create_mipmaps != FALSE;
-
-  if (create_mipmaps != priv->create_mipmaps)
-    {
-      CoglTexture *base_texture;
-      priv->create_mipmaps = create_mipmaps;
-      base_texture = create_mipmaps ?
-        COGL_TEXTURE (priv->texture) : NULL;
-      meta_texture_tower_set_base_texture (priv->paint_tower, base_texture);
-    }
-}
-
-void
 meta_shaped_texture_set_mask_texture (MetaShapedTexture *stex,
                                       CoglTexture       *mask_texture)
 {
@@ -434,8 +381,6 @@ meta_shaped_texture_update_area (MetaShapedTexture *stex,
   cogl_texture_pixmap_x11_update_area (priv->texture,
                                        x, y, width, height);
 
-  meta_texture_tower_update_area (priv->paint_tower, x, y, width, height);
-
   clutter_actor_queue_redraw_with_clip (CLUTTER_ACTOR (stex), &clip);
 }
 
@@ -514,10 +459,6 @@ meta_shaped_texture_set_pixmap (MetaShapedTexture *stex,
     }
   else
     set_cogl_texture (stex, NULL);
-
-  if (priv->create_mipmaps)
-    meta_texture_tower_set_base_texture (priv->paint_tower,
-                                         COGL_TEXTURE (priv->texture));
 }
 
 /**
diff --git a/src/compositor/meta-texture-tower.c b/src/compositor/meta-texture-tower.c
deleted file mode 100644
index 9afed601d..000000000
--- a/src/compositor/meta-texture-tower.c
+++ /dev/null
@@ -1,624 +0,0 @@
-/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
-/*
- * MetaTextureTower
- *
- * Mipmap emulation by creation of scaled down images
- *
- * Copyright (C) 2009 Red Hat, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
-
-#include <math.h>
-#include <string.h>
-
-#include "meta-texture-tower.h"
-#include "meta-texture-rectangle.h"
-
-#ifndef M_LOG2E
-#define M_LOG2E 1.4426950408889634074
-#endif
-
-#define MAX_TEXTURE_LEVELS 12
-
-/* If the texture format in memory doesn't match this, then Mesa
- * will do the conversion, so things will still work, but it might
- * be slow depending on how efficient Mesa is. These should be the
- * native formats unless the display is 16bpp. If conversions
- * here are a bottleneck, investigate whether we are converting when
- * storing window data *into* the texture before adding extra code
- * to handle multiple texture formats.
- */
-#if G_BYTE_ORDER == G_LITTLE_ENDIAN
-#define TEXTURE_FORMAT COGL_PIXEL_FORMAT_BGRA_8888_PRE
-#else
-#define TEXTURE_FORMAT COGL_PIXEL_FORMAT_ARGB_8888_PRE
-#endif
-
-typedef struct
-{
-  guint16 x1;
-  guint16 y1;
-  guint16 x2;
-  guint16 y2;
-} Box;
-
-struct _MetaTextureTower
-{
-  int n_levels;
-  CoglTexture *textures[MAX_TEXTURE_LEVELS];
-  CoglOffscreen *fbos[MAX_TEXTURE_LEVELS];
-  Box invalid[MAX_TEXTURE_LEVELS];
-};
-
-/**
- * meta_texture_tower_new:
- *
- * Creates a new texture tower. The base texture has to be set with
- * meta_texture_tower_set_base_texture() before use.
- *
- * Return value: the new texture tower. Free with meta_texture_tower_free()
- */
-MetaTextureTower *
-meta_texture_tower_new (void)
-{
-  MetaTextureTower *tower;
-
-  tower = g_slice_new0 (MetaTextureTower);
-
-  return tower;
-}
-
-/**
- * meta_texture_tower_free:
- * @tower: a #MetaTextureTower
- *
- * Frees a texture tower created with meta_texture_tower_new().
- */
-void
-meta_texture_tower_free (MetaTextureTower *tower)
-{
-  g_return_if_fail (tower != NULL);
-
-  meta_texture_tower_set_base_texture (tower, NULL);
-
-  g_slice_free (MetaTextureTower, tower);
-}
-
-/**
- * meta_texture_tower_set_base_texture:
- * @tower: a #MetaTextureTower
- * @texture: the new texture used as a base for scaled down versions
- *
- * Sets the base texture that is the scaled texture that the
- * scaled textures of the tower are derived from. The texture itself
- * will be used as level 0 of the tower and will be referenced until
- * unset or until the tower is freed.
- */
-void
-meta_texture_tower_set_base_texture (MetaTextureTower *tower,
-                                     CoglTexture      *texture)
-{
-  int i;
-
-  g_return_if_fail (tower != NULL);
-
-  if (texture == tower->textures[0])
-    return;
-
-  if (tower->textures[0] != NULL)
-    {
-      for (i = 1; i < tower->n_levels; i++)
-        {
-          if (tower->textures[i] != NULL)
-            {
-              cogl_object_unref (tower->textures[i]);
-              tower->textures[i] = NULL;
-            }
-
-          if (tower->fbos[i] != NULL)
-            {
-              cogl_object_unref (tower->fbos[i]);
-              tower->fbos[i] = NULL;
-            }
-        }
-
-      cogl_object_unref (tower->textures[0]);
-    }
-
-  tower->textures[0] = texture;
-
-  if (tower->textures[0] != NULL)
-    {
-      int width, height;
-
-      cogl_object_ref (tower->textures[0]);
-
-      width = cogl_texture_get_width (tower->textures[0]);
-      height = cogl_texture_get_height (tower->textures[0]);
-
-      tower->n_levels = 1 + MAX ((int)(M_LOG2E * log (width)), (int)(M_LOG2E * log (height)));
-      tower->n_levels = MIN(tower->n_levels, MAX_TEXTURE_LEVELS);
-
-      meta_texture_tower_update_area (tower, 0, 0, width, height);
-    }
-  else
-    {
-      tower->n_levels = 0;
-    }
-}
-
-/**
- * meta_texture_tower_update_area:
- * @tower: a #MetaTextureTower
- * @x: X coordinate of upper left of rectangle that changed
- * @y: Y coordinate of upper left of rectangle that changed
- * @width: width of rectangle that changed
- * @height: height rectangle that changed
- *
- * Mark a region of the base texture as having changed; the next
- * time a scaled down version of the base texture is retrieved,
- * the appropriate area of the scaled down texture will be updated.
- */
-void
-meta_texture_tower_update_area (MetaTextureTower *tower,
-                                int               x,
-                                int               y,
-                                int               width,
-                                int               height)
-{
-  int texture_width, texture_height;
-  Box invalid;
-  int i;
-
-  g_return_if_fail (tower != NULL);
-
-  if (tower->textures[0] == NULL)
-    return;
-
-  texture_width = cogl_texture_get_width (tower->textures[0]);
-  texture_height = cogl_texture_get_height (tower->textures[0]);
-
-  invalid.x1 = x;
-  invalid.y1 = y;
-  invalid.x2 = x + width;
-  invalid.y2 = y + height;
-
-  for (i = 1; i < tower->n_levels; i++)
-    {
-      texture_width = MAX (1, texture_width / 2);
-      texture_height = MAX (1, texture_height / 2);
-
-      invalid.x1 = invalid.x1 / 2;
-      invalid.y1 = invalid.y1 / 2;
-      invalid.x2 = MIN (texture_width, (invalid.x2 + 1) / 2);
-      invalid.y2 = MIN (texture_height, (invalid.y2 + 1) / 2);
-
-      if (tower->invalid[i].x1 == tower->invalid[i].x2 ||
-          tower->invalid[i].y1 == tower->invalid[i].y2)
-        {
-          tower->invalid[i] = invalid;
-        }
-      else
-        {
-          tower->invalid[i].x1 = MIN (tower->invalid[i].x1, invalid.x1);
-          tower->invalid[i].y1 = MIN (tower->invalid[i].y1, invalid.y1);
-          tower->invalid[i].x2 = MAX (tower->invalid[i].x2, invalid.x2);
-          tower->invalid[i].y2 = MAX (tower->invalid[i].y2, invalid.y2);
-        }
-    }
-}
-
-/* It generally looks worse if we scale up a window texture by even a
- * small amount than if we scale it down using bilinear filtering, so
- * we always pick the *larger* adjacent level. */
-#define LOD_BIAS (-0.49)
-
-/* This determines the appropriate level of detail to use when drawing the
- * texture, in a way that corresponds to what the GL specification does
- * when mip-mapping. This is probably fancier and slower than what we need,
- * but we do the computation only once each time we paint a window, and
- * its easier to just use the equations from the specification than to
- * come up with something simpler.
- *
- * If window is being painted at an angle from the viewer, then we have to
- * pick a point in the texture; we use the middle of the texture (which is
- * why the width/height are passed in.) This is not the normal case for
- * Meta.
- */
-static int
-get_paint_level (int width, int height)
-{
-  CoglMatrix projection, modelview, pm;
-  float v[4];
-  double viewport_width, viewport_height;
-  double u0, v0;
-  double xc, yc, wc;
-  double dxdu_, dxdv_, dydu_, dydv_;
-  double det_, det_sq;
-  double rho_sq;
-  double lambda;
-
-  /* See
-   * http://www.opengl.org/registry/doc/glspec32.core.20090803.pdf
-   * Section 3.8.9, p. 1.6.2. Here we have
-   *
-   *  u(x,y) = x_o;
-   *  v(x,y) = y_o;
-   *
-   * Since we are mapping 1:1 from object coordinates into pixel
-   * texture coordinates, the clip coordinates are:
-   *
-   *  (x_c)                               (x_o)        (u)
-   *  (y_c) = (M_projection)(M_modelview) (y_o) = (PM) (v)
-   *  (z_c)                               (z_o)        (0)
-   *  (w_c)                               (w_o)        (1)
-   */
-
-  cogl_get_projection_matrix (&projection);
-  cogl_get_modelview_matrix (&modelview);
-
-  cogl_matrix_multiply (&pm, &projection, &modelview);
-
-  cogl_get_viewport (v);
-  viewport_width = v[2];
-  viewport_height = v[3];
-
-  u0 = width / 2.;
-  v0 = height / 2.;
-
-  xc = pm.xx * u0 + pm.xy * v0 + pm.xw;
-  yc = pm.yx * u0 + pm.yy * v0 + pm.yw;
-  wc = pm.wx * u0 + pm.wy * v0 + pm.ww;
-
-  /* We'll simplify the equations below for a bit of micro-optimization.
-   * The commented out code is the unsimplified version.
-
-  // Partial derivates of window coordinates:
-  //
-  //  x_w = 0.5 * viewport_width * x_c / w_c + viewport_center_x
-  //  y_w = 0.5 * viewport_height * y_c / w_c + viewport_center_y
-  //
-  // with respect to u, v, using
-  // d(a/b)/dx = da/dx * (1/b) - a * db/dx / (b^2)
-
-  dxdu = 0.5 * viewport_width * (pm.xx - pm.wx * (xc/wc)) / wc;
-  dxdv = 0.5 * viewport_width * (pm.xy - pm.wy * (xc/wc)) / wc;
-  dydu = 0.5 * viewport_height * (pm.yx - pm.wx * (yc/wc)) / wc;
-  dydv = 0.5 * viewport_height * (pm.yy - pm.wy * (yc/wc)) / wc;
-
-  // Compute the inverse partials as the matrix inverse
-  det = dxdu * dydv - dxdv * dydu;
-
-  dudx =   dydv / det;
-  dudy = - dxdv / det;
-  dvdx = - dydu / det;
-  dvdy =   dvdu / det;
-
-  // Scale factor; maximum of the distance in texels for a change of 1 pixel
-  // in the X direction or 1 pixel in the Y direction
-  rho = MAX (sqrt (dudx * dudx + dvdx * dvdx), sqrt(dudy * dudy + dvdy * dvdy));
-
-  // Level of detail
-  lambda = log2 (rho) + LOD_BIAS;
-  */
-
-  /* dxdu * wc, etc */
-  dxdu_ = 0.5 * viewport_width * (pm.xx - pm.wx * (xc/wc));
-  dxdv_ = 0.5 * viewport_width * (pm.xy - pm.wy * (xc/wc));
-  dydu_ = 0.5 * viewport_height * (pm.yx - pm.wx * (yc/wc));
-  dydv_ = 0.5 * viewport_height * (pm.yy - pm.wy * (yc/wc));
-
-  /* det * wc^2 */
-  det_ = dxdu_ * dydv_ - dxdv_ * dydu_;
-  det_sq = det_ * det_;
-  if (det_sq == 0.0)
-    return -1;
-
-  /* (rho * det * wc)^2 */
-  rho_sq = MAX (dydv_ * dydv_ + dydu_ * dydu_, dxdv_ * dxdv_ + dxdu_ * dxdu_);
-  lambda = 0.5 * M_LOG2E * log (rho_sq * wc * wc / det_sq) + LOD_BIAS;
-
-#if 0
-  g_print ("%g %g %g\n", 0.5 * viewport_width * pm.xx / pm.ww, 0.5 * viewport_height * pm.yy / pm.ww, lambda);
-#endif
-
-  if (lambda <= 0.)
-    return 0;
-  else
-    return (int)(0.5 + lambda);
-}
-
-static gboolean
-is_power_of_two (int x)
-{
-  return (x & (x - 1)) == 0;
-}
-
-static void
-texture_tower_create_texture (MetaTextureTower *tower,
-                              int               level,
-                              int               width,
-                              int               height)
-{
-  if ((!is_power_of_two (width) || !is_power_of_two (height)) &&
-      meta_texture_rectangle_check (tower->textures[level - 1]))
-    {
-      tower->textures[level] =
-        meta_texture_rectangle_new (width, height,
-                                    /* data format */
-                                    TEXTURE_FORMAT,
-                                    /* internal cogl format */
-                                    TEXTURE_FORMAT,
-                                    /* rowstride */
-                                    width * 4,
-                                    /* data */
-                                    NULL,
-                                    /* error */
-                                    NULL);
-    }
-  else
-    {
-      tower->textures[level] = cogl_texture_new_with_size (width, height,
-                                                           COGL_TEXTURE_NO_AUTO_MIPMAP,
-                                                           TEXTURE_FORMAT);
-    }
-
-  tower->invalid[level].x1 = 0;
-  tower->invalid[level].y1 = 0;
-  tower->invalid[level].x2 = width;
-  tower->invalid[level].y2 = height;
-}
-
-static gboolean
-texture_tower_revalidate_fbo (MetaTextureTower *tower,
-                              int               level)
-{
-  CoglTexture *source_texture = tower->textures[level - 1];
-  int source_texture_width = cogl_texture_get_width (source_texture);
-  int source_texture_height = cogl_texture_get_height (source_texture);
-  CoglTexture *dest_texture = tower->textures[level];
-  int dest_texture_width = cogl_texture_get_width (dest_texture);
-  int dest_texture_height = cogl_texture_get_height (dest_texture);
-  Box *invalid = &tower->invalid[level];
-  CoglMatrix modelview;
-
-  if (tower->fbos[level] == NULL)
-    tower->fbos[level] = cogl_offscreen_new_to_texture (dest_texture);
-
-  if (tower->fbos[level] == NULL)
-    return FALSE;
-
-  cogl_push_framebuffer (COGL_FRAMEBUFFER (tower->fbos[level]));
-
-  cogl_ortho (0, dest_texture_width, dest_texture_height, 0, -1., 1.);
-
-  cogl_matrix_init_identity (&modelview);
-  cogl_set_modelview_matrix (&modelview);
-
-  cogl_set_source_texture (tower->textures[level - 1]);
-  cogl_rectangle_with_texture_coords (invalid->x1, invalid->y1,
-                                      invalid->x2, invalid->y2,
-                                      (2. * invalid->x1) / source_texture_width,
-                                      (2. * invalid->y1) / source_texture_height,
-                                      (2. * invalid->x2) / source_texture_width,
-                                      (2. * invalid->y2) / source_texture_height);
-
-  cogl_pop_framebuffer ();
-
-  return TRUE;
-}
-
-static void
-fill_copy (guchar       *buf,
-           const guchar *source,
-           int           width)
-{
-  memcpy (buf, source, width * 4);
-}
-
-static void
-fill_scale_down (guchar       *buf,
-                 const guchar *source,
-                 int           width)
-{
-  while (width > 1)
-    {
-      buf[0] = (source[0] + source[4]) / 2;
-      buf[1] = (source[1] + source[5]) / 2;
-      buf[2] = (source[2] + source[6]) / 2;
-      buf[3] = (source[3] + source[7]) / 2;
-
-      buf += 4;
-      source += 8;
-      width -= 2;
-    }
-
-  if (width > 0)
-    {
-      buf[0] = source[0] / 2;
-      buf[1] = source[1] / 2;
-      buf[2] = source[2] / 2;
-      buf[3] = source[3] / 2;
-    }
-}
-
-static void
-texture_tower_revalidate_client (MetaTextureTower *tower,
-                                 int               level)
-{
-  CoglTexture *source_texture = tower->textures[level - 1];
-  int source_texture_width = cogl_texture_get_width (source_texture);
-  int source_texture_height = cogl_texture_get_height (source_texture);
-  guint source_rowstride;
-  guchar *source_data;
-  CoglTexture *dest_texture = tower->textures[level];
-  int dest_texture_width = cogl_texture_get_width (dest_texture);
-  int dest_texture_height = cogl_texture_get_height (dest_texture);
-  int dest_x = tower->invalid[level].x1;
-  int dest_y = tower->invalid[level].y1;
-  int dest_width = tower->invalid[level].x2 - tower->invalid[level].x1;
-  int dest_height = tower->invalid[level].y2 - tower->invalid[level].y1;
-  guchar *dest_data;
-  guchar *source_tmp1 = NULL, *source_tmp2 = NULL;
-  int i, j;
-
-  source_rowstride = source_texture_width * 4;
-
-  source_data = g_malloc (source_texture_height * source_rowstride);
-  cogl_texture_get_data (source_texture, TEXTURE_FORMAT, source_rowstride,
-                         source_data);
-
-  dest_data = g_malloc (dest_height * dest_width * 4);
-
-  if (dest_texture_height < source_texture_height)
-    {
-      source_tmp1 = g_malloc (dest_width * 4);
-      source_tmp2 = g_malloc (dest_width * 4);
-    }
-
-  for (i = 0; i < dest_height; i++)
-    {
-      guchar *dest_row = dest_data + i * dest_width * 4;
-      if (dest_texture_height < source_texture_height)
-        {
-          guchar *source1, *source2;
-          guchar *dest;
-
-          if (dest_texture_width < source_texture_width)
-            {
-              fill_scale_down (source_tmp1,
-                               source_data + ((i + dest_y) * 2) * source_rowstride + dest_x * 2 * 4,
-                               dest_width * 2);
-              fill_scale_down (source_tmp2,
-                               source_data + ((i + dest_y) * 2 + 1) * source_rowstride + dest_x * 2 * 4,
-                               dest_width * 2);
-            }
-          else
-            {
-              fill_copy (source_tmp1,
-                         source_data + ((i + dest_y) * 2) * source_rowstride + dest_x * 4,
-                         dest_width);
-              fill_copy (source_tmp2,
-                         source_data + ((i + dest_y) * 2 + 1) * source_rowstride + dest_x * 4,
-                         dest_width);
-            }
-
-          source1 = source_tmp1;
-          source2 = source_tmp2;
-
-          dest = dest_row;
-          for (j = 0; j < dest_width * 4; j++)
-            *(dest++) = (*(source1++) + *(source2++)) / 2;
-        }
-      else
-        {
-          if (dest_texture_width < source_texture_width)
-            fill_scale_down (dest_row,
-                             source_data + (i + dest_y) * source_rowstride + dest_x * 2 * 4,
-                             dest_width * 2);
-          else
-            fill_copy (dest_row,
-                       source_data + (i + dest_y) * source_rowstride,
-                       dest_width);
-        }
-    }
-
-  cogl_texture_set_region (dest_texture,
-                           0, 0,
-                           dest_x, dest_y,
-                           dest_width, dest_height,
-                           dest_width, dest_height,
-                           TEXTURE_FORMAT,
-                           4 * dest_width,
-                           dest_data);
-
-  if (dest_texture_height < source_texture_height)
-    {
-      g_free (source_tmp1);
-      g_free (source_tmp2);
-    }
-
-  g_free (source_data);
-  g_free (dest_data);
-}
-
-static void
-texture_tower_revalidate (MetaTextureTower *tower,
-                          int               level)
-{
-  if (!texture_tower_revalidate_fbo (tower, level))
-    texture_tower_revalidate_client (tower, level);
-}
-
-/**
- * meta_texture_tower_get_paint_texture:
- * @tower: a #MetaTextureTower
- *
- * Gets the texture from the tower that best matches the current
- * rendering scale. (On the assumption here the texture is going to
- * be rendered with vertex coordinates that correspond to its
- * size in pixels, so a 200x200 texture will be rendered on the
- * rectangle (0, 0, 200, 200).
- *
- * Return value: the COGL texture handle to use for painting, or
- *  %NULL if no base texture has yet been set.
- */
-CoglTexture *
-meta_texture_tower_get_paint_texture (MetaTextureTower *tower)
-{
-  int texture_width, texture_height;
-  int level;
-
-  g_return_val_if_fail (tower != NULL, NULL);
-
-  if (tower->textures[0] == NULL)
-    return NULL;
-
-  texture_width = cogl_texture_get_width (tower->textures[0]);
-  texture_height = cogl_texture_get_height (tower->textures[0]);
-
-  level = get_paint_level(texture_width, texture_height);
-  if (level < 0) /* singular paint matrix, scaled to nothing */
-    return NULL;
-  level = MIN (level, tower->n_levels - 1);
-
-  if (tower->textures[level] == NULL ||
-      (tower->invalid[level].x2 != tower->invalid[level].x1 &&
-       tower->invalid[level].y2 != tower->invalid[level].y1))
-    {
-      int i;
-
-      for (i = 1; i <= level; i++)
-       {
-         /* Use "floor" convention here to be consistent with the NPOT texture extension */
-         texture_width = MAX (1, texture_width / 2);
-         texture_height = MAX (1, texture_height / 2);
-
-         if (tower->textures[i] == NULL)
-           texture_tower_create_texture (tower, i, texture_width, texture_height);
-       }
-
-      for (i = 1; i <= level; i++)
-       {
-         if (tower->invalid[level].x2 != tower->invalid[level].x1 &&
-             tower->invalid[level].y2 != tower->invalid[level].y1)
-           texture_tower_revalidate (tower, i);
-       }
-   }
-
-  return tower->textures[level];
-}
diff --git a/src/compositor/meta-texture-tower.h b/src/compositor/meta-texture-tower.h
deleted file mode 100644
index e135d8056..000000000
--- a/src/compositor/meta-texture-tower.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
-/*
- * MetaTextureTower
- *
- * Mipmap emulation by creation of scaled down images
- *
- * Copyright (C) 2009 Red Hat, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
-
-#ifndef __META_TEXTURE_TOWER_H__
-#define __META_TEXTURE_TOWER_H__
-
-#include <clutter/clutter.h>
-
-G_BEGIN_DECLS
-
-/**
- * SECTION:MetaTextureTower
- * @short_description: mipmap emulation by creation of scaled down images
- *
- * A #MetaTextureTower is used to get good looking scaled down images when
- * we can't use the GL drivers mipmap support. There are two separate reasons
- *
- *  - Some cards (including radeon cards <= r5xx) only support
- *    TEXTURE_RECTANGLE_ARB and not NPOT textures. Rectangular textures
- *    are defined not to support mipmapping.
- *  - Even when NPOT textures are available, the combination of NPOT
- *    textures, texture_from_pixmap, and mipmapping doesn't typically
- *    work, since the X server doesn't allocate pixmaps in the right
- *    layout for mipmapping.
- *
- * So, what we do is create the "mipmap" levels ourselves by successive
- * power-of-two scaledowns, and when rendering pick the single texture
- * that best matches the scale we are rendering at. (Since we aren't
- * typically using perspective transforms, we'll frequently have a single
- * scale for the entire texture.)
- */
-
-typedef struct _MetaTextureTower MetaTextureTower;
-
-MetaTextureTower *meta_texture_tower_new               (void);
-void              meta_texture_tower_free              (MetaTextureTower *tower);
-void              meta_texture_tower_set_base_texture  (MetaTextureTower *tower,
-                                                        CoglTexture      *texture);
-void              meta_texture_tower_update_area       (MetaTextureTower *tower,
-                                                        int               x,
-                                                        int               y,
-                                                        int               width,
-                                                        int               height);
-CoglTexture      *meta_texture_tower_get_paint_texture (MetaTextureTower *tower);
-
-G_BEGIN_DECLS
-
-#endif /* __META_TEXTURE_TOWER_H__ */
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 5b123d6db..89d04be8b 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -1782,10 +1782,6 @@ check_needs_pixmap (MetaWindowActor *self)
           goto out;
         }
 
-      if (compositor->no_mipmaps)
-        meta_shaped_texture_set_create_mipmaps (META_SHAPED_TEXTURE (priv->actor),
-                                                FALSE);
-
       meta_shaped_texture_set_pixmap (META_SHAPED_TEXTURE (priv->actor),
                                       priv->back_pixmap);
 
diff --git a/src/meta/meta-shaped-texture.h b/src/meta/meta-shaped-texture.h
index 28fb5f603..df841d475 100644
--- a/src/meta/meta-shaped-texture.h
+++ b/src/meta/meta-shaped-texture.h
@@ -66,9 +66,6 @@ GType meta_shaped_texture_get_type (void) G_GNUC_CONST;
 
 ClutterActor *meta_shaped_texture_new (void);
 
-void meta_shaped_texture_set_create_mipmaps (MetaShapedTexture *stex,
-					     gboolean           create_mipmaps);
-
 void meta_shaped_texture_update_area (MetaShapedTexture *stex,
                                       int                x,
                                       int                y,