- size = util_format_get_stride(pt->format, align(texWidth, TILE_SIZE)) *
- util_format_get_nblocksy(pt->format, align(texHeight, TILE_SIZE));
-
- ctrans->map = align_malloc(size, 16);
- if (!ctrans->map)
- return NULL; /* out of memory */
-
- if (transfer->usage & PIPE_TRANSFER_READ) {
- /* need to untwiddle the texture to make a linear version */
- const uint bpp = util_format_get_blocksize(ct->base.format);
- if (bpp == 4) {
- const uint *src = (uint *) (ct->mapped + ctrans->offset);
- uint *dst = ctrans->map;
- untwiddle_image_uint(texWidth, texHeight, TILE_SIZE,
- dst, stride, src);
- }
- else {
- // xxx fix
+ if (transfer->resource->target != PIPE_BUFFER) {
+ const uint level = ctrans->base.sr.level;
+ const uint texWidth = u_minify(pt->width0, level);
+ const uint texHeight = u_minify(pt->height0, level);
+ unsigned size;
+
+
+ /*
+ * Create a buffer of ordinary memory for the linear texture.
+ * This is the memory that the user will read/write.
+ */
+ size = (util_format_get_stride(pt->format, align(texWidth, TILE_SIZE)) *
+ util_format_get_nblocksy(pt->format, align(texHeight, TILE_SIZE)));
+
+ ctrans->map = align_malloc(size, 16);
+ if (!ctrans->map)
+ return NULL; /* out of memory */
+
+ if (transfer->usage & PIPE_TRANSFER_READ) {
+ /* Textures always stored twiddled, need to untwiddle the
+ * texture to make a linear version.
+ */
+ const uint bpp = util_format_get_blocksize(ct->base.format);
+ if (bpp == 4) {
+ const uint *src = (uint *) (ct->mapped + ctrans->offset);
+ uint *dst = ctrans->map;
+ untwiddle_image_uint(texWidth, texHeight, TILE_SIZE,
+ dst, transfer->stride, src);
+ }
+ else {
+ // xxx fix
+ }