Mesa (master): gallium: add a cond rendering hook for vulkan.

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Module: Mesa
Branch: master
Commit: 86328fc7b700f6e93d2f569fbfffc992954f855f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=86328fc7b700f6e93d2f569fbfffc992954f855f

Author: Dave Airlie <airlied at redhat.com>
Date:   Fri Dec  4 17:27:16 2020 +1000

gallium: add a cond rendering hook for vulkan.

The vulkan cond rendering hook is quite different than the
traditional gallium one so add a new interface for it.

This just conditionalises rendering on the memory location.

Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Reviewed-by: Roland Scheidegger <sroland at vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8182>

---

 docs/gallium/context.rst             |  3 +++
 src/gallium/include/pipe/p_context.h | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/docs/gallium/context.rst b/docs/gallium/context.rst
index 3503f02c8d5..6c0752b57cd 100644
--- a/docs/gallium/context.rst
+++ b/docs/gallium/context.rst
@@ -563,6 +563,9 @@ Normally, if the occlusion query returned a non-zero result subsequent
 drawing happens normally so fragments may be generated, shaded and
 processed even where they're known to be obscured.
 
+The ''render_condition_mem'' function specifies the drawing is dependant
+on a value in memory. A buffer resource and offset denote which 32-bit
+value to use for the query. This is used for Vulkan API.
 
 Flushing
 ^^^^^^^^
diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 7707eb6f2b6..99aeea21d7e 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -153,6 +153,16 @@ struct pipe_context {
                              bool condition,
                              enum pipe_render_cond_flag mode );
 
+   /**
+    * Predicate subsequent rendering on a value in a buffer
+    * \param buffer The buffer to query for the value
+    * \param offset Offset in the buffer to query 32-bit
+    * \param condition whether to skip on FALSE or TRUE query results
+    */
+   void (*render_condition_mem)( struct pipe_context *pipe,
+                                 struct pipe_resource *buffer,
+                                 uint32_t offset,
+                                 bool condition );
    /**
     * Query objects
     */