nouveau: Frontbuffer pitch needs to be set.

src/gallium/drivers/nv04/nv04_miptree.c

@@ -87,6 +87,7 @@ nv04_miptree_blanket(struct pipe_screen *pscreen, const struct pipe_texture *pt,
 	mt->base = *pt;
 	mt->base.refcount = 1;
 	mt->base.screen = pscreen;
+	mt->level[0].pitch = stride[0];
 	mt->level[0].image_offset = CALLOC(1, sizeof(unsigned));
 
 	pipe_buffer_reference(pscreen, &mt->buffer, pb);

src/gallium/drivers/nv10/nv10_miptree.c

@@ -68,6 +68,7 @@ nv10_miptree_blanket(struct pipe_screen *pscreen, const struct pipe_texture *pt,
 	mt->base = *pt;
 	mt->base.refcount = 1;
 	mt->base.screen = pscreen;
+	mt->level[0].pitch = stride[0];
 	mt->level[0].image_offset = CALLOC(1, sizeof(unsigned));
 
 	pipe_buffer_reference(pscreen, &mt->buffer, pb);

src/gallium/drivers/nv20/nv20_miptree.c

@@ -68,6 +68,7 @@ nv20_miptree_blanket(struct pipe_screen *pscreen, const struct pipe_texture *pt,
 	mt->base = *pt;
 	mt->base.refcount = 1;
 	mt->base.screen = pscreen;
+	mt->level[0].pitch = stride[0];
 	mt->level[0].image_offset = CALLOC(1, sizeof(unsigned));
 
 	pipe_buffer_reference(pscreen, &mt->buffer, pb);

src/gallium/drivers/nv30/nv30_miptree.c

@@ -123,6 +123,7 @@ nv30_miptree_blanket(struct pipe_screen *pscreen, const struct pipe_texture *pt,
 	mt->base = *pt;
 	mt->base.refcount = 1;
 	mt->base.screen = pscreen;
+	mt->level[0].pitch = stride[0];
 	mt->level[0].image_offset = CALLOC(1, sizeof(unsigned));
 
 	pipe_buffer_reference(pscreen, &mt->buffer, pb);

src/gallium/drivers/nv40/nv40_miptree.c

@@ -124,6 +124,7 @@ nv40_miptree_blanket(struct pipe_screen *pscreen, const struct pipe_texture *pt,
 	mt->base = *pt;
 	mt->base.refcount = 1;
 	mt->base.screen = pscreen;
+	mt->level[0].pitch = stride[0];
 	mt->level[0].image_offset = CALLOC(1, sizeof(unsigned));
 
 	pipe_buffer_reference(pscreen, &mt->buffer, pb);