From fad8497d3b1cead6f0a5056deaa49350ed4e4d41 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keithw@vmware.com>
Date: Wed, 5 Jan 2011 17:33:43 +0000
Subject: gallium: new transfer flag: DISCARD_WHOLE_RESOURCE

---
 src/gallium/include/pipe/p_defines.h | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

(limited to 'src/gallium/include')

diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index f66bbaf6674..8b565522d0f 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -229,9 +229,9 @@ enum pipe_transfer_usage {
     *
     * See also:
     * - OpenGL's ARB_map_buffer_range extension, MAP_INVALIDATE_RANGE_BIT flag.
-    * - Direct3D's D3DLOCK_DISCARD flag.
     */
-   PIPE_TRANSFER_DISCARD = (1 << 8),
+   PIPE_TRANSFER_DISCARD = (1 << 8), /* DEPRECATED */
+   PIPE_TRANSFER_DISCARD_RANGE = (1 << 8),
 
    /**
     * Fail if the resource cannot be mapped immediately.
@@ -266,7 +266,22 @@ enum pipe_transfer_usage {
     * - pipe_context::transfer_flush_region
     * - OpenGL's ARB_map_buffer_range extension, MAP_FLUSH_EXPLICIT_BIT flag.
     */
-   PIPE_TRANSFER_FLUSH_EXPLICIT = (1 << 11)
+   PIPE_TRANSFER_FLUSH_EXPLICIT = (1 << 11),
+
+   /**
+    * Discards all memory backing the resource.
+    *
+    * It should not be used with PIPE_TRANSFER_CPU_READ.
+    *
+    * This is equivalent to:
+    * - OpenGL's ARB_map_buffer_range extension, MAP_INVALIDATE_BUFFER_BIT
+    * - BufferData(NULL) on a GL buffer
+    * - Direct3D's D3DLOCK_DISCARD flag.
+    * - WDDM's D3DDDICB_LOCKFLAGS.Discard flag.
+    * - D3D10 DDI's D3D10_DDI_MAP_WRITE_DISCARD flag
+    * - D3D10's D3D10_MAP_WRITE_DISCARD flag.
+    */
+   PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE = (1 << 12)
 
 };
 
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