i915tex: Sync pages between pipes immediately again.

This should be safe now that we no longer use the MI_WAIT_FOR_EVENT instruction
incorrectly and should also work correctly with applications that render to the
front buffer.

diff --git a/src/mesa/drivers/dri/i915tex/intel_buffers.c b/src/mesa/drivers/dri/i915tex/intel_buffers.c
index 35236ed..174f3c6 100644 (file)
--- a/src/mesa/drivers/dri/i915tex/intel_buffers.c
+++ b/src/mesa/drivers/dri/i915tex/intel_buffers.c
@@ -257,6 +257,8 @@ intelWindowMoved(struct intel_context *intel)
         if (pf_pipes == 0x3 && pf_pipes != intel_fb->pf_pipes &&
             (intel->sarea->pf_current_page & 0x3) !=
             (((intel->sarea->pf_current_page) >> 2) & 0x3)) {
+           drm_i915_flip_t flip;
+
            if (intel_fb->pf_current_page ==
                (intel->sarea->pf_current_page & 0x3)) {
               /* XXX: This is ugly, but emitting two flips 'in a row' can cause
@@ -265,13 +267,21 @@ intelWindowMoved(struct intel_context *intel)
                intel->sarea->pf_current_page =
                  intel->sarea->pf_current_page & 0x3;
               intel->sarea->pf_current_page |=
-                 intel->sarea->pf_current_page << 2;
+                 ((intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
+                  intel_fb->pf_num_pages) << 2;
+
+              flip.pipes = 0x2;
            } else {
                intel->sarea->pf_current_page =
                  intel->sarea->pf_current_page & (0x3 << 2);
               intel->sarea->pf_current_page |=
-                 intel->sarea->pf_current_page >> 2;
+                 (intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
+                 intel_fb->pf_num_pages;
+
+              flip.pipes = 0x1;
            }
+
+           drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
         }
 
         intel_fb->pf_pipes = pf_pipes;