st/mesa: properly implement MapTextureImage with multiple mapped slices (v2)

This is needed by _mesa_generate_mipmap.

This adds an array of pipe_transfers to st_texture_image. Each transfer is
for mapping a single layer.

v2: allocate the array of transfers on demand

1 files changed, 8 insertions, 3 deletions

diff --git a/src/mesa/state_tracker/st_texture.h b/src/mesa/state_tracker/st_texture.h
index f2afaf139f1..affb5681264 100644
--- a/src/mesa/state_tracker/st_texture.h
+++ b/src/mesa/state_tracker/st_texture.h
@@ -56,7 +56,11 @@ struct st_texture_image
     */
    struct pipe_resource *pt;
 
-   struct pipe_transfer *transfer;
+   /* List of transfers, allocated on demand.
+    * transfer[layer] is a mapping for that layer.
+    */
+   struct pipe_transfer **transfer;
+   unsigned num_transfers;
 };
 
 
@@ -195,11 +199,12 @@ extern GLubyte *
 st_texture_image_map(struct st_context *st, struct st_texture_image *stImage,
                      enum pipe_transfer_usage usage,
                      GLuint x, GLuint y, GLuint z,
-                     GLuint w, GLuint h, GLuint d);
+                     GLuint w, GLuint h, GLuint d,
+                     struct pipe_transfer **transfer);
 
 extern void
 st_texture_image_unmap(struct st_context *st,
-                       struct st_texture_image *stImage);
+                       struct st_texture_image *stImage, unsigned slice);
 
 
 /* Return pointers to each 2d slice within an image.  Indexed by depth