gallium: Make sure we flush before some texture / buffer operations.

Also implement context member functions to optimize away those
flushes whenever possible.

Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>

2 files changed, 35 insertions, 1 deletions

diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index c5c839799ea..57e966ac3b0 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -42,7 +42,6 @@ struct pipe_state_cache;
 struct pipe_query;
 struct pipe_winsys;
 
-
 /**
  * Gallium rendering context.  Basically:
  *  - state setting functions
@@ -231,6 +230,34 @@ struct pipe_context {
    void (*flush)( struct pipe_context *pipe,
                   unsigned flags,
                   struct pipe_fence_handle **fence );
+
+   /**
+    * Check whether a texture is referenced by an unflushed hw command.
+    * The state-tracker uses this function to optimize away unnecessary
+    * flushes. It is safe (but wasteful) to always return.
+    * PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE.
+    * \param pipe  The pipe context whose unflushed hw commands will be
+    *              checked.
+    * \param level  mipmap level.
+    * \param texture  texture to check.
+    * \param face  cubemap face. Use 0 for non-cubemap texture.
+    */
+
+   unsigned int (*is_texture_referenced) (struct pipe_context *pipe,
+					  struct pipe_texture *texture,
+					  unsigned face, unsigned level);
+   /**
+    * Check whether a buffer is referenced by an unflushed hw command.
+    * The state-tracker uses this function to optimize away unnecessary
+    * flushes. It is safe (but wasteful) to always return
+    * PIPE_REFERENCED_FOR_READ | PIPE_REFERENCED_FOR_WRITE.
+    * \param pipe  The pipe context whose unflushed hw commands will be
+    *              checked.
+    * \param buf  Buffer to check.
+    */
+
+   unsigned int (*is_buffer_referenced) (struct pipe_context *pipe,
+					 struct pipe_buffer *buf);
 };
 
 
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 1d2aa109495..82e23c413c8 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -312,6 +312,13 @@ enum pipe_transfer_usage {
 #define PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS 26
 
 
+/**
+ * Referenced query flags.
+ */
+
+#define PIPE_UNREFERENCED         0
+#define PIPE_REFERENCED_FOR_READ  (1 << 0)
+#define PIPE_REFERENCED_FOR_WRITE (1 << 1)
 
 #ifdef __cplusplus
 }