Mesa (9.0): SwapBuffersRegionNOK: invert rectangles on y axis

[Matt Turner]

Module: Mesa
Branch: 9.0
Commit: e1cb50b15dbb75d1ba0fe184d05be7d302b058ee
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e1cb50b15dbb75d1ba0fe184d05be7d302b058ee

Author: Robert Bragg <robert at linux.intel.com>
Date:   Tue Sep 18 16:10:03 2012 +0100

SwapBuffersRegionNOK: invert rectangles on y axis

The EGL_NOK_swap_region2 spec states that the rectangles are specified
with a bottom-left origin within a surface coordinate space also with a
bottom left origin, so this patch ensures the rectangles are flipped
before passing them on to dri2_copy_region.

Fixes piglit's egl-nok-swap-region test.

Tested-by: Matt Turner <mattst88 at gmail.com>
(cherry picked from commit 0a523a8820e8a2549ac1c7887eb1892b228af44b)

---

 src/egl/drivers/dri2/platform_x11.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/src/egl/drivers/dri2/platform_x11.c b/src/egl/drivers/dri2/platform_x11.c
index 7486a91..939af86 100644
--- a/src/egl/drivers/dri2/platform_x11.c
+++ b/src/egl/drivers/dri2/platform_x11.c
@@ -778,10 +778,9 @@ dri2_swap_buffers_region(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *draw,
    if (numRects > (int)ARRAY_SIZE(rectangles))
       return dri2_copy_region(drv, disp, draw, dri2_surf->region);
 
-   /* FIXME: Invert y here? */
    for (i = 0; i < numRects; i++) {
       rectangles[i].x = rects[i * 4];
-      rectangles[i].y = rects[i * 4 + 1];
+      rectangles[i].y = dri2_surf->base.Height - rects[i * 4 + 1] - rects[i * 4 + 3];
       rectangles[i].width = rects[i * 4 + 2];
       rectangles[i].height = rects[i * 4 + 3];
    }