gbm: Add map/unmap functions

This adds map and unmap functions to GBM utilizing the DRIimage extension
mapImage/unmapImage functions or existing internal mapping for dumb
buffers. Unlike prior attempts, this version provides a region to map and
usage flags for the mapping. The operation follows the same semantics as
the gallium transfer_map() function.

This was tested with GBM based gralloc on Android.

Signed-off-by: Rob Herring <[email protected]>
[Emil Velikov: drop no longer relevant hunk from commit message.]
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/gbm/main/gbmint.h b/src/gbm/main/gbmint.h
index 155eb12b06b..914e2c1749a 100644
--- a/src/gbm/main/gbmint.h
+++ b/src/gbm/main/gbmint.h
@@ -68,6 +68,12 @@ struct gbm_device {
                                uint32_t usage);
    struct gbm_bo *(*bo_import)(struct gbm_device *gbm, uint32_t type,
                                void *buffer, uint32_t usage);
+   void *(*bo_map)(struct gbm_bo *bo,
+                               uint32_t x, uint32_t y,
+                               uint32_t width, uint32_t height,
+                               uint32_t flags, uint32_t *stride,
+                               void **map_data);
+   void (*bo_unmap)(struct gbm_bo *bo, void *map_data);
    int (*bo_write)(struct gbm_bo *bo, const void *buf, size_t data);
    int (*bo_get_fd)(struct gbm_bo *bo);
    void (*bo_destroy)(struct gbm_bo *bo);