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>

1 files changed, 21 insertions, 1 deletions

diff --git a/src/mesa/state_tracker/st_texture.c b/src/mesa/state_tracker/st_texture.c
index 19eb7e2f69c..fcbaeb69894 100644
--- a/src/mesa/state_tracker/st_texture.c
+++ b/src/mesa/state_tracker/st_texture.c
@@ -188,8 +188,10 @@ st_texture_image_map(struct st_context *st, struct st_texture_image *stImage,
 		     GLuint zoffset, enum pipe_transfer_usage usage,
                      GLuint x, GLuint y, GLuint w, GLuint h)
 {
-   struct pipe_screen *screen = st->pipe->screen;
+   struct pipe_context *pipe = st->pipe;
+   struct pipe_screen *screen = pipe->screen;
    struct pipe_texture *pt = stImage->pt;
+
    DBG("%s \n", __FUNCTION__);
 
    stImage->transfer = screen->get_tex_transfer(screen, pt, stImage->face,
@@ -265,6 +267,7 @@ st_texture_image_data(struct pipe_context *pipe,
    struct pipe_transfer *dst_transfer;
 
    DBG("%s\n", __FUNCTION__);
+
    for (i = 0; i < depth; i++) {
       dst_transfer = screen->get_tex_transfer(screen, dst, face, level, i,
                                               PIPE_TRANSFER_WRITE, 0, 0,
@@ -481,3 +484,20 @@ st_release_teximage(struct st_framebuffer *stfb, uint surfIndex,
 
    return 1;
 }
+
+void
+st_teximage_flush_before_map(struct st_context *st,
+			     struct pipe_texture *pt,
+			     unsigned int face,
+			     unsigned int level,
+			     enum pipe_transfer_usage usage)
+{
+   struct pipe_context *pipe = st->pipe;
+   unsigned referenced =
+      pipe->is_texture_referenced(pipe, pt, face, level);
+
+   if (referenced && ((referenced & PIPE_REFERENCED_FOR_WRITE) ||
+		      usage == PIPE_TRANSFER_WRITE ||
+		      usage == PIPE_TRANSFER_READ_WRITE))
+      st_flush(st, PIPE_FLUSH_RENDER_CACHE, NULL);
+}