st/egl: Add support for swap interval and swap behavior.

The value of EGL_MAX_SWAP_INTERVAL and whether
EGL_SWAP_BEHAVIOR_PRESERVED_BIT is set will depend on the native
backend used.

2 files changed, 22 insertions, 5 deletions

diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c b/src/gallium/state_trackers/egl/common/egl_g3d.c
index 30ddcd5bc14..3d0d13cfb13 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
@@ -156,7 +156,8 @@ egl_g3d_add_screens(_EGLDriver *drv, _EGLDisplay *dpy)
  */
 static EGLBoolean
 init_config_attributes(_EGLConfig *conf, const struct native_config *nconf,
-                       EGLint api_mask, enum pipe_format depth_stencil_format)
+                       EGLint api_mask, enum pipe_format depth_stencil_format,
+                       EGLBoolean preserve_buffer, EGLint max_swap_interval)
 {
    uint rgba[4], depth_stencil[2], buffer_size;
    EGLint surface_type;
@@ -238,6 +239,11 @@ init_config_attributes(_EGLConfig *conf, const struct native_config *nconf,
       conf->TransparentBlueValue = nconf->transparent_rgb_values[2];
    }
 
+   conf->MinSwapInterval = 0;
+   conf->MaxSwapInterval = max_swap_interval;
+   if (preserve_buffer)
+      conf->SurfaceType |= EGL_SWAP_BEHAVIOR_PRESERVED_BIT;
+
    return _eglValidateConfig(conf, EGL_FALSE);
 }
 
@@ -247,7 +253,8 @@ init_config_attributes(_EGLConfig *conf, const struct native_config *nconf,
 static EGLBoolean
 egl_g3d_init_config(_EGLDriver *drv, _EGLDisplay *dpy,
                     _EGLConfig *conf, const struct native_config *nconf,
-                    enum pipe_format depth_stencil_format)
+                    enum pipe_format depth_stencil_format,
+                    int preserve_buffer, int max_swap_interval)
 {
    struct egl_g3d_config *gconf = egl_g3d_config(conf);
    EGLint buffer_mask, api_mask;
@@ -288,7 +295,8 @@ egl_g3d_init_config(_EGLDriver *drv, _EGLDisplay *dpy,
    }
 
    valid = init_config_attributes(&gconf->base,
-         nconf, api_mask, depth_stencil_format);
+         nconf, api_mask, depth_stencil_format,
+         preserve_buffer, max_swap_interval);
    if (!valid) {
       _eglLog(_EGL_DEBUG, "skip invalid config 0x%x", nconf->native_visual_id);
       return EGL_FALSE;
@@ -349,6 +357,7 @@ egl_g3d_add_configs(_EGLDriver *drv, _EGLDisplay *dpy, EGLint id)
    const struct native_config **native_configs;
    enum pipe_format depth_stencil_formats[8];
    int num_formats, num_configs, i, j;
+   int preserve_buffer, max_swap_interval;
 
    native_configs = gdpy->native->get_configs(gdpy->native, &num_configs);
    if (!num_configs) {
@@ -357,6 +366,11 @@ egl_g3d_add_configs(_EGLDriver *drv, _EGLDisplay *dpy, EGLint id)
       return id;
    }
 
+   preserve_buffer =
+      gdpy->native->get_param(gdpy->native, NATIVE_PARAM_PRESERVE_BUFFER);
+   max_swap_interval =
+      gdpy->native->get_param(gdpy->native, NATIVE_PARAM_MAX_SWAP_INTERVAL);
+
    num_formats = egl_g3d_fill_depth_stencil_formats(dpy,
          depth_stencil_formats);
 
@@ -368,7 +382,8 @@ egl_g3d_add_configs(_EGLDriver *drv, _EGLDisplay *dpy, EGLint id)
          if (gconf) {
             _eglInitConfig(&gconf->base, dpy, id);
             if (!egl_g3d_init_config(drv, dpy, &gconf->base,
-                     native_configs[i], depth_stencil_formats[j])) {
+                     native_configs[i], depth_stencil_formats[j],
+                     preserve_buffer, max_swap_interval)) {
                FREE(gconf);
                break;
             }
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 7f85cf1290c..8fc9d1cb93d 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d_api.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
@@ -540,7 +540,9 @@ egl_g3d_swap_buffers(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf)
    }
 
    return gsurf->native->present(gsurf->native,
-         NATIVE_ATTACHMENT_BACK_LEFT, FALSE, 0);
+         NATIVE_ATTACHMENT_BACK_LEFT,
+         gsurf->base.SwapBehavior == EGL_BUFFER_PRESERVED,
+         gsurf->base.SwapInterval);
 }
 
 /**