gallium: notify drivers about possible changes in user buffer contents

Also implement the redefine_user_buffer hook in the drivers.

3 files changed, 15 insertions, 6 deletions

diff --git a/src/gallium/auxiliary/util/u_blitter.c b/src/gallium/auxiliary/util/u_blitter.c
index e27c445096..fd1c2b72d0 100644
--- a/src/gallium/auxiliary/util/u_blitter.c
+++ b/src/gallium/auxiliary/util/u_blitter.c
@@ -639,6 +639,8 @@ static void blitter_draw_rectangle(struct blitter_context *blitter,
    }
 
    blitter_set_rectangle(ctx, x1, y1, x2, y2, depth);
+   ctx->base.pipe->redefine_user_buffer(ctx->base.pipe, ctx->vbuf,
+                                        0, ctx->vbuf->width0);
    util_draw_vertex_buffer(ctx->base.pipe, NULL, ctx->vbuf, 0,
                            PIPE_PRIM_TRIANGLE_FAN, 4, 2);
 }
@@ -867,6 +869,8 @@ void util_blitter_copy_region(struct blitter_context *blitter,
 
          /* Draw. */
          blitter_set_rectangle(ctx, dstx, dsty, dstx+width, dsty+height, 0);
+         ctx->base.pipe->redefine_user_buffer(ctx->base.pipe, ctx->vbuf,
+                                              0, ctx->vbuf->width0);
          util_draw_vertex_buffer(ctx->base.pipe, NULL, ctx->vbuf, 0,
                                  PIPE_PRIM_TRIANGLE_FAN, 4, 2);
          break;
diff --git a/src/gallium/auxiliary/util/u_transfer.c b/src/gallium/auxiliary/util/u_transfer.c
index e2828cfd99..b6c63d9642 100644
--- a/src/gallium/auxiliary/util/u_transfer.c
+++ b/src/gallium/auxiliary/util/u_transfer.c
@@ -112,3 +112,10 @@ void u_default_transfer_destroy(struct pipe_context *pipe,
    FREE(transfer);
 }
 
+void u_default_redefine_user_buffer(struct pipe_context *ctx,
+                                    struct pipe_resource *resource,
+                                    unsigned offset,
+                                    unsigned size)
+{
+   resource->width0 = MAX2(resource->width0, offset + size);
+}
diff --git a/src/gallium/auxiliary/util/u_transfer.h b/src/gallium/auxiliary/util/u_transfer.h
index 52191512ac..8cf9c418b0 100644
--- a/src/gallium/auxiliary/util/u_transfer.h
+++ b/src/gallium/auxiliary/util/u_transfer.h
@@ -136,11 +136,9 @@ void u_transfer_inline_write_vtbl( struct pipe_context *rm_ctx,
                                    unsigned stride,
                                    unsigned layer_stride);
 
-
-
-
-
-
-
+void u_default_redefine_user_buffer(struct pipe_context *ctx,
+                                    struct pipe_resource *resource,
+                                    unsigned offset,
+                                    unsigned size);
 
 #endif