radeon: steal miptree optimisation from intel codebase

This replaces a miptree if it won't distrub anything else.

diff --git a/src/mesa/drivers/dri/radeon/radeon_texture.c b/src/mesa/drivers/dri/radeon/radeon_texture.c
index 4aa081c..6949ee4 100644 (file)
--- a/src/mesa/drivers/dri/radeon/radeon_texture.c
+++ b/src/mesa/drivers/dri/radeon/radeon_texture.c
@@ -517,6 +517,16 @@ static void radeon_teximage(
        /* Allocate memory for image */
        radeonFreeTexImageData(ctx, texImage); /* Mesa core only clears texImage->Data but not image->mt */
 
+       if (t->mt &&
+           t->mt->firstLevel == level &&
+           t->mt->lastLevel == level &&
+           t->mt->target != GL_TEXTURE_CUBE_MAP_ARB &&
+           !radeon_miptree_matches_image(t->mt, texImage, face, level)) {
+         fprintf(stderr,"freeing old miptree\n");
+         radeon_miptree_unreference(t->mt);
+         t->mt = NULL;
+       }
+
        if (!t->mt)
                radeon_try_alloc_miptree(rmesa, t, texImage, face, level);
        if (t->mt && radeon_miptree_matches_image(t->mt, texImage, face, level)) {