Mesa (master): mesa: add Const.BufferCreateMapUnsynchronizedThreadSafe & MESA_MAP_THREAD_SAFE

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Module: Mesa
Branch: master
Commit: b8223244c38ad1c433b33b37bff3f19e7a9d2cfc
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b8223244c38ad1c433b33b37bff3f19e7a9d2cfc

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Sun Mar  8 17:43:26 2020 -0400

mesa: add Const.BufferCreateMapUnsynchronizedThreadSafe & MESA_MAP_THREAD_SAFE

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4758>

---

 src/mesa/main/dd.h                           | 3 +++
 src/mesa/main/mtypes.h                       | 6 ++++++
 src/mesa/state_tracker/st_cb_bufferobjects.c | 2 ++
 src/mesa/state_tracker/st_extensions.c       | 3 +++
 4 files changed, 14 insertions(+)

diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index 3fd47ba6f9e..b7973e1c6ae 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -70,6 +70,9 @@ struct _mesa_index_buffer;
  */
 #define MESA_MAP_NOWAIT_BIT       0x4000
 
+/* Mapping a buffer is allowed from any thread. */
+#define MESA_MAP_THREAD_SAFE_BIT  0x8000
+
 
 /**
  * Device driver function table.
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index db55117bc08..a8b75b32f52 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -4126,6 +4126,12 @@ struct gl_constants
    /** When drivers are OK with mapped buffers during draw and other calls. */
    bool AllowMappedBuffersDuringExecution;
 
+   /**
+    * Whether buffer creation, unsynchronized mapping, unmapping, and
+    * deletion is thread-safe.
+    */
+   bool BufferCreateMapUnsynchronizedThreadSafe;
+
    /** GL_ARB_get_program_binary */
    GLuint NumProgramBinaryFormats;
 
diff --git a/src/mesa/state_tracker/st_cb_bufferobjects.c b/src/mesa/state_tracker/st_cb_bufferobjects.c
index c95a3d4d2ac..33778df0afa 100644
--- a/src/mesa/state_tracker/st_cb_bufferobjects.c
+++ b/src/mesa/state_tracker/st_cb_bufferobjects.c
@@ -494,6 +494,8 @@ st_access_flags_to_transfer_flags(GLbitfield access, bool wholeBuffer)
 
    if (access & MESA_MAP_NOWAIT_BIT)
       flags |= PIPE_TRANSFER_DONTBLOCK;
+   if (access & MESA_MAP_THREAD_SAFE_BIT)
+      flags |= PIPE_TRANSFER_THREAD_SAFE;
 
    return flags;
 }
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index b0ee3e2210a..b6f6091fb3a 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -556,6 +556,9 @@ void st_init_limits(struct pipe_screen *screen,
    c->AllowMappedBuffersDuringExecution =
       screen->get_param(screen, PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION);
 
+   c->BufferCreateMapUnsynchronizedThreadSafe =
+      screen->get_param(screen, PIPE_CAP_MAP_UNSYNCHRONIZED_THREAD_SAFE);
+
    c->UseSTD430AsDefaultPacking =
       screen->get_param(screen, PIPE_CAP_LOAD_CONSTBUF);