2 files changed, 68 insertions, 0 deletions
diff --git a/src/gallium/drivers/svga/svga_resource_texture.c b/src/gallium/drivers/svga/svga_resource_texture.c
index 05f56cb1559..6d5b4c57c91 100644
--- a/src/gallium/drivers/svga/svga_resource_texture.c
+++ b/src/gallium/drivers/svga/svga_resource_texture.c
@@ -232,6 +232,7 @@ svga_texture_destroy(struct pipe_screen *screen,
 
    ss->total_resource_bytes -= tex->size;
 
+   FREE(tex->rendered_to);
    FREE(tex);
 }
 
@@ -475,9 +476,15 @@ svga_texture_create(struct pipe_screen *screen,
    tex->size = util_resource_size(template);
    svgascreen->total_resource_bytes += tex->size;
 
+   tex->rendered_to = CALLOC(template->depth0 * template->array_size,
+                             sizeof(tex->rendered_to[0]));
+   if (!tex->rendered_to)
+      goto error2;
+
    return &tex->b.b;
 
 error2:
+   FREE(tex->rendered_to);
    FREE(tex);
 error1:
    return NULL;
@@ -536,5 +543,7 @@ svga_texture_from_handle(struct pipe_screen *screen,
    tex->key.cachable = 0;
    tex->handle = srf;
 
+   tex->rendered_to = CALLOC(1, sizeof(tex->rendered_to[0]));
+
    return &tex->b.b;
 }
diff --git a/src/gallium/drivers/svga/svga_resource_texture.h b/src/gallium/drivers/svga/svga_resource_texture.h
index 7e2e61339e0..0602fa00873 100644
--- a/src/gallium/drivers/svga/svga_resource_texture.h
+++ b/src/gallium/drivers/svga/svga_resource_texture.h
@@ -78,6 +78,9 @@ struct svga_texture
    struct svga_winsys_surface *handle;
 
    unsigned size;  /**< Approximate size in bytes */
+
+   /** array indexed by cube face or 3D/array slice, one bit per mipmap level */
+   ushort *rendered_to;
 };
 
 
@@ -143,6 +146,62 @@ svga_define_texture_level(struct svga_texture *tex,
 }
 
 
+static INLINE bool
+svga_is_texture_level_defined(const struct svga_texture *tex,
+                              unsigned face, unsigned level)
+{
+   assert(face < Elements(tex->defined));
+   assert(level < Elements(tex->defined[0]));
+   return tex->defined[face][level];
+}
+
+
+/** For debugging, check that face and level are legal */
+static inline void
+check_face_level(const struct svga_texture *tex,
+                 unsigned face, unsigned level)
+{
+   if (tex->b.b.target == PIPE_TEXTURE_CUBE) {
+      assert(face < 6);
+   }
+   else if (tex->b.b.target == PIPE_TEXTURE_3D) {
+      assert(face < tex->b.b.depth0);
+   }
+   else {
+      assert(face < tex->b.b.array_size);
+   }
+
+   assert(level < 8 * sizeof(tex->rendered_to[0]));
+}
+
+
+static INLINE void
+svga_set_texture_rendered_to(struct svga_texture *tex,
+                             unsigned face, unsigned level)
+{
+   check_face_level(tex, face, level);
+   tex->rendered_to[face] |= 1 << level;
+}
+
+
+static INLINE void
+svga_clear_texture_rendered_to(struct svga_texture *tex,
+                               unsigned face, unsigned level)
+{
+   check_face_level(tex, face, level);
+   tex->rendered_to[face] &= ~(1 << level);
+}
+
+
+static INLINE boolean
+svga_was_texture_rendered_to(const struct svga_texture *tex,
+                             unsigned face, unsigned level)
+{
+   check_face_level(tex, face, level);
+   return !!(tex->rendered_to[face] & (1 << level));
+}
+
+
 struct pipe_resource *
 svga_texture_create(struct pipe_screen *screen,
                     const struct pipe_resource *template);