gallium: Unify reference counting.

The core reference counting code is centralized in p_refcnt.h.

This has some consequences related to struct pipe_buffer:

* The screen member of struct pipe_buffer must be initialized, or
  pipe_buffer_reference() will crash trying to destroy a buffer with reference
  count 0. u_simple_screen takes care of this, but I may have missed some of
  the drivers not using it.
* Except for rare exceptions deep in winsys code, buffers must always be
  allocated via pipe_buffer_create() or via screen->*buffer_create() rather
  than via winsys->*buffer_create().

1 files changed, 6 insertions, 6 deletions

diff --git a/src/mesa/state_tracker/st_cb_drawpixels.c b/src/mesa/state_tracker/st_cb_drawpixels.c
index cc7a9e7890..0a09e7e6f1 100644
--- a/src/mesa/state_tracker/st_cb_drawpixels.c
+++ b/src/mesa/state_tracker/st_cb_drawpixels.c
@@ -392,7 +392,7 @@ make_texture(struct st_context *st,
 
       /* unmap */
       screen->transfer_unmap(screen, transfer);
-      screen->tex_transfer_release(screen, &transfer);
+      screen->tex_transfer_destroy(transfer);
 
       assert(success);
 
@@ -495,7 +495,7 @@ draw_quad(GLcontext *ctx, GLfloat x0, GLfloat y0, GLfloat z,
                               PIPE_PRIM_QUADS,
                               4,  /* verts */
                               3); /* attribs/vert */
-      pipe_buffer_reference(pipe->screen, &buf, NULL);
+      pipe_buffer_reference(&buf, NULL);
    }
 }
 
@@ -808,7 +808,7 @@ draw_stencil_pixels(GLcontext *ctx, GLint x, GLint y,
 
    /* unmap the stencil buffer */
    screen->transfer_unmap(screen, pt);
-   screen->tex_transfer_release(screen, &pt);
+   screen->tex_transfer_destroy(pt);
 }
 
 
@@ -951,7 +951,7 @@ copy_stencil_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
 
    /* unmap the stencil buffer */
    screen->transfer_unmap(screen, ptDraw);
-   screen->tex_transfer_release(screen, &ptDraw);
+   screen->tex_transfer_destroy(ptDraw);
 }
 
 
@@ -1070,8 +1070,8 @@ st_CopyPixels(GLcontext *ctx, GLint srcx, GLint srcy,
          _mesa_free(buf);
       }
 
-      screen->tex_transfer_release(screen, &ptRead);
-      screen->tex_transfer_release(screen, &ptTex);
+      screen->tex_transfer_destroy(ptRead);
+      screen->tex_transfer_destroy(ptTex);
    }
 
    /* draw textured quad */