winsys/amdgpu: Add support for const IB.

v2: Use the correct IB to update request (Bas Nieuwenhuizen)
v3: Add preamble IB. (Bas Nieuwenhuizen)
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeon/radeon_winsys.h b/src/gallium/drivers/radeon/radeon_winsys.h
index aa94df69362..451d8a4ec0c 100644
--- a/src/gallium/drivers/radeon/radeon_winsys.h
+++ b/src/gallium/drivers/radeon/radeon_winsys.h
@@ -603,6 +603,36 @@ struct radeon_winsys {
                                           void *flush_ctx);
 
     /**
+     * Add a constant engine IB to a graphics CS. This makes the graphics CS
+     * from "cs_create" a group of two IBs that share a buffer list and are
+     * flushed together.
+     *
+     * The returned constant CS is only a stream for writing packets to the new
+     * IB. Calling other winsys functions with it is not allowed, not even
+     * "cs_destroy".
+     *
+     * In order to add buffers and check memory usage, use the graphics CS.
+     * In order to flush it, use the graphics CS, which will flush both IBs.
+     * Destroying the graphics CS will destroy both of them.
+     *
+     * \param cs  The graphics CS from "cs_create" that will hold the buffer
+     *            list and will be used for flushing.
+     */
+    struct radeon_winsys_cs *(*cs_add_const_ib)(struct radeon_winsys_cs *cs);
+
+     /**
+     * Add a constant engine preamble IB to a graphics CS. This add an extra IB
+     * in similar manner to cs_add_const_ib. This should always be called after
+     * cs_add_const_ib.
+     *
+     * The returned IB is a constant engine IB that only gets flushed if the
+     * context changed.
+     *
+     * \param cs  The graphics CS from "cs_create" that will hold the buffer
+     *            list and will be used for flushing.
+     */
+    struct radeon_winsys_cs *(*cs_add_const_preamble_ib)(struct radeon_winsys_cs *cs);
+    /**
      * Destroy a command stream.
      *
      * \param cs        A command stream to destroy.