i915g: add winsys function to create tiled buffers

Different kernels have different restrictions for tiled buffers.
Hence use the libdrm abstraction to calculate the necessary
stride and height alignment requirements.

Not yet used.

v2: Incorporate review comments from Jakob Bornecrantz

Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Jakob Bornecrantz <[email protected]>
Signed-off-by: Jakob Bornecrantz <[email protected]>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/gallium/drivers/i915/i915_winsys.h b/src/gallium/drivers/i915/i915_winsys.h
index 3d5627045bc..59b7220e592 100644
--- a/src/gallium/drivers/i915/i915_winsys.h
+++ b/src/gallium/drivers/i915/i915_winsys.h
@@ -134,6 +134,20 @@ struct i915_winsys {
                        enum i915_winsys_buffer_type type);
 
    /**
+    * Create a tiled buffer.
+    *
+    * *stride, height are in bytes. The winsys tries to allocate the buffer with
+    * the tiling mode provide in *tiling. If tiling is no possible, *tiling will
+    * be set to I915_TILE_NONE. The calculated stride (incorporateing hw/kernel
+    * requirements) is always returned in *stride.
+    */
+   struct i915_winsys_buffer *
+      (*buffer_create_tiled)(struct i915_winsys *iws,
+                             unsigned *stride, unsigned height,
+                             enum i915_winsys_buffer_tile *tiling,
+                             enum i915_winsys_buffer_type type);
+
+   /**
     * Creates a buffer from a handle.
     * Used to implement pipe_screen::resource_from_handle.
     * Also provides the stride information needed for the