gallium: add interface for persistent and coherent buffer mappings

Required for ARB_buffer_storage.

2 files changed, 35 insertions, 3 deletions

diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 209ec9e074b..0702729e36f 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -406,7 +406,12 @@ struct pipe_context {
     * Flush any pending framebuffer writes and invalidate texture caches.
     */
    void (*texture_barrier)(struct pipe_context *);
-   
+
+   /**
+    * Flush caches according to flags.
+    */
+   void (*memory_barrier)(struct pipe_context *, unsigned flags);
+
    /**
     * Creates a video codec for a specific video format/profile
     */
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 764c2484f87..a220de04048 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -295,8 +295,27 @@ enum pipe_transfer_usage {
     * - D3D10 DDI's D3D10_DDI_MAP_WRITE_DISCARD flag
     * - D3D10's D3D10_MAP_WRITE_DISCARD flag.
     */
-   PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE = (1 << 12)
+   PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE = (1 << 12),
 
+   /**
+    * Allows the resource to be used for rendering while mapped.
+    *
+    * PIPE_RESOURCE_FLAG_MAP_PERSISTENT must be set when creating
+    * the resource.
+    *
+    * If COHERENT is not set, memory_barrier(PIPE_BARRIER_MAPPED_BUFFER)
+    * must be called to ensure the device can see what the CPU has written.
+    */
+   PIPE_TRANSFER_PERSISTENT = (1 << 13),
+
+   /**
+    * If PERSISTENT is set, this ensures any writes done by the device are
+    * immediately visible to the CPU and vice versa.
+    *
+    * PIPE_RESOURCE_FLAG_MAP_COHERENT must be set when creating
+    * the resource.
+    */
+   PIPE_TRANSFER_COHERENT = (1 << 14)
 };
 
 /**
@@ -306,6 +325,11 @@ enum pipe_flush_flags {
    PIPE_FLUSH_END_OF_FRAME = (1 << 0)
 };
 
+/**
+ * Flags for pipe_context::memory_barrier.
+ */
+#define PIPE_BARRIER_MAPPED_BUFFER     (1 << 0)
+
 /*
  * Resource binding flags -- state tracker must specify in advance all
  * the ways a resource might be used.
@@ -352,6 +376,8 @@ enum pipe_flush_flags {
 
 /* Flags for the driver about resource behaviour:
  */
+#define PIPE_RESOURCE_FLAG_MAP_PERSISTENT (1 << 0)
+#define PIPE_RESOURCE_FLAG_MAP_COHERENT   (1 << 1)
 #define PIPE_RESOURCE_FLAG_DRV_PRIV    (1 << 16) /* driver/winsys private */
 #define PIPE_RESOURCE_FLAG_ST_PRIV     (1 << 24) /* state-tracker/winsys private */
 
@@ -524,7 +550,8 @@ enum pipe_cap {
    PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES = 88,
    PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS = 89,
    PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS = 90,
-   PIPE_CAP_TEXTURE_GATHER_SM5 = 91
+   PIPE_CAP_TEXTURE_GATHER_SM5 = 91,
+   PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT = 92
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)