Re: [Mesa-dev] [PATCH 1/2] st/egl: Add support for EGL_NOK_swap_region

2011-12-14 Thread Fredrik Höglund 
On Tuesday 13 December 2011, Chia-I Wu wrote:
 On Fri, Dec 9, 2011 at 11:36 PM, Fredrik Höglund fred...@kde.org wrote:
  Backends indicate that they support this extension by returning
  EGL_TRUE when native_display::get_param() is called with
  NATIVE_PARAM_PRESENT_REGION.
 
  native_present_control is extended to include the region that should
  be presented. When the whole surface is to be presented, this region
  will be a single rect containing the dimensions of the surface.
 
  Signed-off-by: Fredrik Höglund fred...@kde.org
  ---
   src/gallium/state_trackers/egl/common/egl_g3d.c|5 +++
   .../state_trackers/egl/common/egl_g3d_api.c|   31 
  ++-
   src/gallium/state_trackers/egl/common/native.h |   12 +++-
   3 files changed, 45 insertions(+), 3 deletions(-)
 
  diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c 
  b/src/gallium/state_trackers/egl/common/egl_g3d.c
  index 182ce68..feebfaf 100644
  --- a/src/gallium/state_trackers/egl/common/egl_g3d.c
  +++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
  @@ -606,6 +606,11 @@ egl_g3d_initialize(_EGLDriver *drv, _EGLDisplay *dpy)
dpy-Extensions.WL_bind_wayland_display = EGL_TRUE;
   #endif
 
  +#ifdef EGL_NOK_swap_region
  +   if (gdpy-native-get_param(gdpy-native, NATIVE_PARAM_PRESENT_REGION))
  +  dpy-Extensions.NOK_swap_region = EGL_TRUE;
  +#endif
  +
 Does EGL_NOK_swap_region require the contents of the back buffer to be
 preserved?  If so, NATIVE_PARAM_PRESERVE_BUFFER needs to be checked
 too.

Unfortunately the specification isn't available, or at least not anywhere
where google can find it. I think the safe thing to do for now is to assume
that the back buffer must be preserved. EGL_NV_post_sub_buffer also
requires this.

  static EGLBoolean
 +egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
 +{
 +   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
 +   const EGLint rect[4] = { 0, 0, gsurf-base.Width, gsurf-base.Height };
 +
 +   return swap_buffers(drv, dpy, surf, 1, rect,
 return swap_buffers(drv, dpy, surf, 0, NULL, ...); seems simpler here.

It moves this logic into the backends, but on the other hand it makes
it easier for them to detect when the whole surface should be presented.
I'll update the patch to do this.

Regards,
Fredrik

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[Mesa-dev] [PATCH 1/2] st/egl: Add support for EGL_NOK_swap_region

2011-12-14 Thread Fredrik Höglund 
Backends indicate that they support this extension by returning
EGL_TRUE when native_display::get_param() is called with
NATIVE_PARAM_PRESENT_REGION and NATIVE_PARAM_PRESERVE_BUFFER.

native_present_control is extended to include the region that should
be presented. When native_present_control::num_rects is zero,
the whole surface is to be presented.

Signed-off-by: Fredrik Höglund fred...@kde.org
---
 src/gallium/state_trackers/egl/common/egl_g3d.c|6 
 .../state_trackers/egl/common/egl_g3d_api.c|   30 ++-
 src/gallium/state_trackers/egl/common/native.h |   13 -
 3 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c 
b/src/gallium/state_trackers/egl/common/egl_g3d.c
index 182ce68..53811b8 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
@@ -606,6 +606,12 @@ egl_g3d_initialize(_EGLDriver *drv, _EGLDisplay *dpy)
   dpy-Extensions.WL_bind_wayland_display = EGL_TRUE;
 #endif
 
+#ifdef EGL_NOK_swap_region
+   if (gdpy-native-get_param(gdpy-native, NATIVE_PARAM_PRESENT_REGION) 
+   gdpy-native-get_param(gdpy-native, NATIVE_PARAM_PRESERVE_BUFFER))
+  dpy-Extensions.NOK_swap_region = EGL_TRUE;
+#endif
+
if (egl_g3d_add_configs(drv, dpy, 1) == 1) {
   _eglError(EGL_NOT_INITIALIZED, eglInitialize(unable to add configs));
   goto fail;
diff --git a/src/gallium/state_trackers/egl/common/egl_g3d_api.c 
b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
index 911540e..2e3ead6 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d_api.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
@@ -546,7 +546,8 @@ egl_g3d_make_current(_EGLDriver *drv, _EGLDisplay *dpy,
 }
 
 static EGLBoolean
-egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
+swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
+ EGLint num_rects, const EGLint *rects, EGLBoolean preserve)
 {
struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
_EGLContext *ctx = _eglGetCurrentContext();
@@ -572,14 +573,35 @@ egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, 
_EGLSurface *surf)
 
memset(ctrl, 0, sizeof(ctrl));
ctrl.natt = NATIVE_ATTACHMENT_BACK_LEFT;
-   ctrl.preserve = (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED);
+   ctrl.preserve = preserve;
ctrl.swap_interval = gsurf-base.SwapInterval;
ctrl.premultiplied_alpha = (gsurf-base.VGAlphaFormat == 
EGL_VG_ALPHA_FORMAT_PRE);
+   ctrl.num_rects = num_rects;
+   ctrl.rects = rects;
 
return gsurf-native-present(gsurf-native, ctrl);
 }
 
 static EGLBoolean
+egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
+{
+   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
+
+   return swap_buffers(drv, dpy, surf, 0, NULL,
+   (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED));
+}
+
+#ifdef EGL_NOK_swap_region
+static EGLBoolean
+egl_g3d_swap_buffers_region(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface 
*surf,
+EGLint num_rects, const EGLint *rects)
+{
+   /* Note: y=0=top */
+   return swap_buffers(drv, dpy, surf, num_rects, rects, EGL_TRUE);
+}
+#endif /* EGL_NOK_swap_region */
+
+static EGLBoolean
 egl_g3d_copy_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
  EGLNativePixmapType target)
 {
@@ -867,4 +889,8 @@ egl_g3d_init_driver_api(_EGLDriver *drv)
drv-API.CreateScreenSurfaceMESA = egl_g3d_create_screen_surface;
drv-API.ShowScreenSurfaceMESA = egl_g3d_show_screen_surface;
 #endif
+
+#ifdef EGL_NOK_swap_region
+   drv-API.SwapBuffersRegionNOK = egl_g3d_swap_buffers_region;
+#endif
 }
diff --git a/src/gallium/state_trackers/egl/common/native.h 
b/src/gallium/state_trackers/egl/common/native.h
index ee24c22..312b079 100644
--- a/src/gallium/state_trackers/egl/common/native.h
+++ b/src/gallium/state_trackers/egl/common/native.h
@@ -81,7 +81,13 @@ enum native_param_type {
 * EGL_ALPHA_SIZE.  EGL_VG_ALPHA_FORMAT attribute of a surface will affect
 * how the surface is presented.
 */
-   NATIVE_PARAM_PREMULTIPLIED_ALPHA
+   NATIVE_PARAM_PREMULTIPLIED_ALPHA,
+
+   /**
+* Return TRUE if native_surface::present supports presenting a partial
+* surface.
+*/
+   NATIVE_PARAM_PRESENT_REGION
 };
 
 /**
@@ -99,6 +105,11 @@ struct native_present_control {
 
/** pixels use premultiplied alpha */
boolean premultiplied_alpha;
+
+   /** The region to present. y=0=top.
+If num_rects is 0, the whole surface is to be presented */
+   int num_rects;
+   const int *rects; /* x, y, width, height */
 };
 
 struct native_surface {
-- 
1.7.7.3

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Re: [Mesa-dev] [PATCH 1/2] st/egl: Add support for EGL_NOK_swap_region

2011-12-14 Thread Chia-I Wu 
On Thu, Dec 15, 2011 at 4:06 AM, Fredrik Höglund fred...@kde.org wrote:
 Backends indicate that they support this extension by returning
 EGL_TRUE when native_display::get_param() is called with
 NATIVE_PARAM_PRESENT_REGION and NATIVE_PARAM_PRESERVE_BUFFER.

 native_present_control is extended to include the region that should
 be presented. When native_present_control::num_rects is zero,
 the whole surface is to be presented.

 Signed-off-by: Fredrik Höglund fred...@kde.org
Committed.  Thanks.
 ---
  src/gallium/state_trackers/egl/common/egl_g3d.c    |    6 
  .../state_trackers/egl/common/egl_g3d_api.c        |   30 ++-
  src/gallium/state_trackers/egl/common/native.h     |   13 -
  3 files changed, 46 insertions(+), 3 deletions(-)

 diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c 
 b/src/gallium/state_trackers/egl/common/egl_g3d.c
 index 182ce68..53811b8 100644
 --- a/src/gallium/state_trackers/egl/common/egl_g3d.c
 +++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
 @@ -606,6 +606,12 @@ egl_g3d_initialize(_EGLDriver *drv, _EGLDisplay *dpy)
       dpy-Extensions.WL_bind_wayland_display = EGL_TRUE;
  #endif

 +#ifdef EGL_NOK_swap_region
 +   if (gdpy-native-get_param(gdpy-native, NATIVE_PARAM_PRESENT_REGION) 
 +       gdpy-native-get_param(gdpy-native, NATIVE_PARAM_PRESERVE_BUFFER))
 +      dpy-Extensions.NOK_swap_region = EGL_TRUE;
 +#endif
 +
    if (egl_g3d_add_configs(drv, dpy, 1) == 1) {
       _eglError(EGL_NOT_INITIALIZED, eglInitialize(unable to add configs));
       goto fail;
 diff --git a/src/gallium/state_trackers/egl/common/egl_g3d_api.c 
 b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
 index 911540e..2e3ead6 100644
 --- a/src/gallium/state_trackers/egl/common/egl_g3d_api.c
 +++ b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
 @@ -546,7 +546,8 @@ egl_g3d_make_current(_EGLDriver *drv, _EGLDisplay *dpy,
  }

  static EGLBoolean
 -egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
 +swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
 +             EGLint num_rects, const EGLint *rects, EGLBoolean preserve)
  {
    struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
    _EGLContext *ctx = _eglGetCurrentContext();
 @@ -572,14 +573,35 @@ egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, 
 _EGLSurface *surf)

    memset(ctrl, 0, sizeof(ctrl));
    ctrl.natt = NATIVE_ATTACHMENT_BACK_LEFT;
 -   ctrl.preserve = (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED);
 +   ctrl.preserve = preserve;
    ctrl.swap_interval = gsurf-base.SwapInterval;
    ctrl.premultiplied_alpha = (gsurf-base.VGAlphaFormat == 
 EGL_VG_ALPHA_FORMAT_PRE);
 +   ctrl.num_rects = num_rects;
 +   ctrl.rects = rects;

    return gsurf-native-present(gsurf-native, ctrl);
  }

  static EGLBoolean
 +egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
 +{
 +   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
 +
 +   return swap_buffers(drv, dpy, surf, 0, NULL,
 +                       (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED));
 +}
 +
 +#ifdef EGL_NOK_swap_region
 +static EGLBoolean
 +egl_g3d_swap_buffers_region(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface 
 *surf,
 +                            EGLint num_rects, const EGLint *rects)
 +{
 +   /* Note: y=0=top */
 +   return swap_buffers(drv, dpy, surf, num_rects, rects, EGL_TRUE);
 +}
 +#endif /* EGL_NOK_swap_region */
 +
 +static EGLBoolean
  egl_g3d_copy_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
                      EGLNativePixmapType target)
  {
 @@ -867,4 +889,8 @@ egl_g3d_init_driver_api(_EGLDriver *drv)
    drv-API.CreateScreenSurfaceMESA = egl_g3d_create_screen_surface;
    drv-API.ShowScreenSurfaceMESA = egl_g3d_show_screen_surface;
  #endif
 +
 +#ifdef EGL_NOK_swap_region
 +   drv-API.SwapBuffersRegionNOK = egl_g3d_swap_buffers_region;
 +#endif
  }
 diff --git a/src/gallium/state_trackers/egl/common/native.h 
 b/src/gallium/state_trackers/egl/common/native.h
 index ee24c22..312b079 100644
 --- a/src/gallium/state_trackers/egl/common/native.h
 +++ b/src/gallium/state_trackers/egl/common/native.h
 @@ -81,7 +81,13 @@ enum native_param_type {
     * EGL_ALPHA_SIZE.  EGL_VG_ALPHA_FORMAT attribute of a surface will affect
     * how the surface is presented.
     */
 -   NATIVE_PARAM_PREMULTIPLIED_ALPHA
 +   NATIVE_PARAM_PREMULTIPLIED_ALPHA,
 +
 +   /**
 +    * Return TRUE if native_surface::present supports presenting a partial
 +    * surface.
 +    */
 +   NATIVE_PARAM_PRESENT_REGION
  };

  /**
 @@ -99,6 +105,11 @@ struct native_present_control {

    /** pixels use premultiplied alpha */
    boolean premultiplied_alpha;
 +
 +   /** The region to present. y=0=top.
 +        If num_rects is 0, the whole surface is to be presented */
 +   int num_rects;
 +   const int *rects; /* x, y, width, height */
  };

  struct native_surface {
 --
 1.7.7.3

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Re: [Mesa-dev] [PATCH 1/2] st/egl: Add support for EGL_NOK_swap_region

2011-12-13 Thread Chia-I Wu 
On Fri, Dec 9, 2011 at 11:36 PM, Fredrik Höglund fred...@kde.org wrote:
 Backends indicate that they support this extension by returning
 EGL_TRUE when native_display::get_param() is called with
 NATIVE_PARAM_PRESENT_REGION.

 native_present_control is extended to include the region that should
 be presented. When the whole surface is to be presented, this region
 will be a single rect containing the dimensions of the surface.

 Signed-off-by: Fredrik Höglund fred...@kde.org
 ---
  src/gallium/state_trackers/egl/common/egl_g3d.c    |    5 +++
  .../state_trackers/egl/common/egl_g3d_api.c        |   31 ++-
  src/gallium/state_trackers/egl/common/native.h     |   12 +++-
  3 files changed, 45 insertions(+), 3 deletions(-)

 diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c 
 b/src/gallium/state_trackers/egl/common/egl_g3d.c
 index 182ce68..feebfaf 100644
 --- a/src/gallium/state_trackers/egl/common/egl_g3d.c
 +++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
 @@ -606,6 +606,11 @@ egl_g3d_initialize(_EGLDriver *drv, _EGLDisplay *dpy)
       dpy-Extensions.WL_bind_wayland_display = EGL_TRUE;
  #endif

 +#ifdef EGL_NOK_swap_region
 +   if (gdpy-native-get_param(gdpy-native, NATIVE_PARAM_PRESENT_REGION))
 +      dpy-Extensions.NOK_swap_region = EGL_TRUE;
 +#endif
 +
Does EGL_NOK_swap_region require the contents of the back buffer to be
preserved?  If so, NATIVE_PARAM_PRESERVE_BUFFER needs to be checked
too.
    if (egl_g3d_add_configs(drv, dpy, 1) == 1) {
       _eglError(EGL_NOT_INITIALIZED, eglInitialize(unable to add configs));
       goto fail;
 diff --git a/src/gallium/state_trackers/egl/common/egl_g3d_api.c 
 b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
 index 911540e..e8f2abc 100644
 --- a/src/gallium/state_trackers/egl/common/egl_g3d_api.c
 +++ b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
 @@ -546,7 +546,8 @@ egl_g3d_make_current(_EGLDriver *drv, _EGLDisplay *dpy,
  }

  static EGLBoolean
 -egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
 +swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
 +             EGLint num_rects, const EGLint *rects, EGLBoolean preserve)
  {
    struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
    _EGLContext *ctx = _eglGetCurrentContext();
 @@ -572,14 +573,36 @@ egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, 
 _EGLSurface *surf)

    memset(ctrl, 0, sizeof(ctrl));
    ctrl.natt = NATIVE_ATTACHMENT_BACK_LEFT;
 -   ctrl.preserve = (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED);
 +   ctrl.preserve = preserve;
    ctrl.swap_interval = gsurf-base.SwapInterval;
    ctrl.premultiplied_alpha = (gsurf-base.VGAlphaFormat == 
 EGL_VG_ALPHA_FORMAT_PRE);
 +   ctrl.num_rects = num_rects;
 +   ctrl.rects = rects;

    return gsurf-native-present(gsurf-native, ctrl);
  }

  static EGLBoolean
 +egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
 +{
 +   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
 +   const EGLint rect[4] = { 0, 0, gsurf-base.Width, gsurf-base.Height };
 +
 +   return swap_buffers(drv, dpy, surf, 1, rect,
return swap_buffers(drv, dpy, surf, 0, NULL, ...); seems simpler here.
 +                       (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED));
 +}
 +
 +#ifdef EGL_NOK_swap_region
 +static EGLBoolean
 +egl_g3d_swap_buffers_region(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface 
 *surf,
 +                            EGLint num_rects, const EGLint *rects)
 +{
 +   /* Note: y=0=top */
 +   return swap_buffers(drv, dpy, surf, num_rects, rects, EGL_TRUE);
This assumes the native display supports buffer preservation.  If the
extension requires that, then NATIVE_PARAM_PRESERVE_BUFFER should be
checked.  If not, EGL_SWAP_BEHAVIOR should be honored.
 +}
 +#endif /* EGL_NOK_swap_region */
 +
 +static EGLBoolean
  egl_g3d_copy_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
                      EGLNativePixmapType target)
  {
 @@ -867,4 +890,8 @@ egl_g3d_init_driver_api(_EGLDriver *drv)
    drv-API.CreateScreenSurfaceMESA = egl_g3d_create_screen_surface;
    drv-API.ShowScreenSurfaceMESA = egl_g3d_show_screen_surface;
  #endif
 +
 +#ifdef EGL_NOK_swap_region
 +   drv-API.SwapBuffersRegionNOK = egl_g3d_swap_buffers_region;
 +#endif
  }
 diff --git a/src/gallium/state_trackers/egl/common/native.h 
 b/src/gallium/state_trackers/egl/common/native.h
 index ee24c22..f1e067e 100644
 --- a/src/gallium/state_trackers/egl/common/native.h
 +++ b/src/gallium/state_trackers/egl/common/native.h
 @@ -81,7 +81,13 @@ enum native_param_type {
     * EGL_ALPHA_SIZE.  EGL_VG_ALPHA_FORMAT attribute of a surface will affect
     * how the surface is presented.
     */
 -   NATIVE_PARAM_PREMULTIPLIED_ALPHA
 +   NATIVE_PARAM_PREMULTIPLIED_ALPHA,
 +
 +   /**
 +    * Return TRUE if native_surface::present supports presenting a partial
 +    * surface.
 +    */
 +   NATIVE_PARAM_PRESENT_REGION
  };

  /**
 @@ -99,6 +105,10 @@ struct

[Mesa-dev] [PATCH 1/2] st/egl: Add support for EGL_NOK_swap_region

2011-12-09 Thread Fredrik Höglund 
Backends indicate that they support this extension by returning
EGL_TRUE when native_display::get_param() is called with
NATIVE_PARAM_PRESENT_REGION.

native_present_control is extended to include the region that should
be presented. When the whole surface is to be presented, this region
will be a single rect containing the dimensions of the surface.

Signed-off-by: Fredrik Höglund fred...@kde.org
---
 src/gallium/state_trackers/egl/common/egl_g3d.c|5 +++
 .../state_trackers/egl/common/egl_g3d_api.c|   31 ++-
 src/gallium/state_trackers/egl/common/native.h |   12 +++-
 3 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c 
b/src/gallium/state_trackers/egl/common/egl_g3d.c
index 182ce68..feebfaf 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
@@ -606,6 +606,11 @@ egl_g3d_initialize(_EGLDriver *drv, _EGLDisplay *dpy)
   dpy-Extensions.WL_bind_wayland_display = EGL_TRUE;
 #endif
 
+#ifdef EGL_NOK_swap_region
+   if (gdpy-native-get_param(gdpy-native, NATIVE_PARAM_PRESENT_REGION))
+  dpy-Extensions.NOK_swap_region = EGL_TRUE;
+#endif
+
if (egl_g3d_add_configs(drv, dpy, 1) == 1) {
   _eglError(EGL_NOT_INITIALIZED, eglInitialize(unable to add configs));
   goto fail;
diff --git a/src/gallium/state_trackers/egl/common/egl_g3d_api.c 
b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
index 911540e..e8f2abc 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d_api.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
@@ -546,7 +546,8 @@ egl_g3d_make_current(_EGLDriver *drv, _EGLDisplay *dpy,
 }
 
 static EGLBoolean
-egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
+swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
+ EGLint num_rects, const EGLint *rects, EGLBoolean preserve)
 {
struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
_EGLContext *ctx = _eglGetCurrentContext();
@@ -572,14 +573,36 @@ egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, 
_EGLSurface *surf)
 
memset(ctrl, 0, sizeof(ctrl));
ctrl.natt = NATIVE_ATTACHMENT_BACK_LEFT;
-   ctrl.preserve = (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED);
+   ctrl.preserve = preserve;
ctrl.swap_interval = gsurf-base.SwapInterval;
ctrl.premultiplied_alpha = (gsurf-base.VGAlphaFormat == 
EGL_VG_ALPHA_FORMAT_PRE);
+   ctrl.num_rects = num_rects;
+   ctrl.rects = rects;
 
return gsurf-native-present(gsurf-native, ctrl);
 }
 
 static EGLBoolean
+egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
+{
+   struct egl_g3d_surface *gsurf = egl_g3d_surface(surf);
+   const EGLint rect[4] = { 0, 0, gsurf-base.Width, gsurf-base.Height };
+
+   return swap_buffers(drv, dpy, surf, 1, rect,
+   (gsurf-base.SwapBehavior == EGL_BUFFER_PRESERVED));
+}
+
+#ifdef EGL_NOK_swap_region
+static EGLBoolean
+egl_g3d_swap_buffers_region(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface 
*surf,
+EGLint num_rects, const EGLint *rects)
+{
+   /* Note: y=0=top */
+   return swap_buffers(drv, dpy, surf, num_rects, rects, EGL_TRUE);
+}
+#endif /* EGL_NOK_swap_region */
+
+static EGLBoolean
 egl_g3d_copy_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
  EGLNativePixmapType target)
 {
@@ -867,4 +890,8 @@ egl_g3d_init_driver_api(_EGLDriver *drv)
drv-API.CreateScreenSurfaceMESA = egl_g3d_create_screen_surface;
drv-API.ShowScreenSurfaceMESA = egl_g3d_show_screen_surface;
 #endif
+
+#ifdef EGL_NOK_swap_region
+   drv-API.SwapBuffersRegionNOK = egl_g3d_swap_buffers_region;
+#endif
 }
diff --git a/src/gallium/state_trackers/egl/common/native.h 
b/src/gallium/state_trackers/egl/common/native.h
index ee24c22..f1e067e 100644
--- a/src/gallium/state_trackers/egl/common/native.h
+++ b/src/gallium/state_trackers/egl/common/native.h
@@ -81,7 +81,13 @@ enum native_param_type {
 * EGL_ALPHA_SIZE.  EGL_VG_ALPHA_FORMAT attribute of a surface will affect
 * how the surface is presented.
 */
-   NATIVE_PARAM_PREMULTIPLIED_ALPHA
+   NATIVE_PARAM_PREMULTIPLIED_ALPHA,
+
+   /**
+* Return TRUE if native_surface::present supports presenting a partial
+* surface.
+*/
+   NATIVE_PARAM_PRESENT_REGION
 };
 
 /**
@@ -99,6 +105,10 @@ struct native_present_control {
 
/** pixels use premultiplied alpha */
boolean premultiplied_alpha;
+
+   /** the region to present. y=0=top */
+   int num_rects;
+   const int *rects; /* x, y, width, height */
 };
 
 struct native_surface {
-- 
1.7.7.3

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