st/xorg: proper fix for compositing after rounding up

Basically don't round up shared textures.  This fixes compiz,
but I'm afraid that rounding up texture sizes here in the driver
is doomed, as it will inevitably break texture wrap modes.

1 files changed, 14 insertions, 6 deletions

diff --git a/src/gallium/state_trackers/xorg/xorg_renderer.c b/src/gallium/state_trackers/xorg/xorg_renderer.c
index 9cb65b0aac..cbb84a8c0d 100644
--- a/src/gallium/state_trackers/xorg/xorg_renderer.c
+++ b/src/gallium/state_trackers/xorg/xorg_renderer.c
@@ -313,21 +313,25 @@ setup_vertex_data_yuv(struct xorg_renderer *r,
  * these concepts are linked.
  */
 void renderer_bind_destination(struct xorg_renderer *r,
-                               struct pipe_surface *surface )
+                               struct pipe_surface *surface,
+                               int width,
+                               int height )
 {
 
    struct pipe_framebuffer_state fb;
    struct pipe_viewport_state viewport;
-   int width = surface->width;
-   int height = surface->height;
 
+   /* Framebuffer uses actual surface width/height
+    */
    memset(&fb, 0, sizeof fb);
-   fb.width  = width;
-   fb.height = height;
+   fb.width  = surface->width;
+   fb.height = surface->height;
    fb.nr_cbufs = 1;
    fb.cbufs[0] = surface;
    fb.zsbuf = 0;
 
+   /* Viewport just touches the bit we're interested in:
+    */
    viewport.scale[0] =  width / 2.f;
    viewport.scale[1] =  height / 2.f;
    viewport.scale[2] =  1.0;
@@ -337,6 +341,8 @@ void renderer_bind_destination(struct xorg_renderer *r,
    viewport.translate[2] = 0.0;
    viewport.translate[3] = 0.0;
 
+   /* Constant buffer set up to match viewport dimensions:
+    */
    if (r->fb_width != width ||
        r->fb_height != height) 
    {
@@ -460,7 +466,9 @@ void renderer_copy_prepare(struct xorg_renderer *r,
       cso_single_sampler_done(r->cso);
    }
 
-   renderer_bind_destination(r, dst_surface);
+   renderer_bind_destination(r, dst_surface, 
+                             dst_surface->width,
+                             dst_surface->height);
 
    /* texture */
    cso_set_sampler_textures(r->cso, 1, &src_texture);