st/egl: Allow single-buffered pixmaps.

All single-buffered configs were ignored before to make sure
EGL_RENDER_BUFFER is settable for window surfaces.  It is better to
allow single-buffered configs and set EGL_WINDOW_BIT only for
double-buffered ones.  This way there can be single-buffered pixmaps.

2 files changed, 17 insertions, 26 deletions

diff --git a/src/gallium/state_trackers/egl/common/egl_g3d.c b/src/gallium/state_trackers/egl/common/egl_g3d.c
index d71ca866cb7..f2b137a674a 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d.c
@@ -183,17 +183,21 @@ init_config_attributes(_EGLConfig *conf, const struct native_config *nconf,
    }
 
    surface_type = 0x0;
-   if (nconf->window_bit)
-      surface_type |= EGL_WINDOW_BIT;
-   if (nconf->pixmap_bit)
-      surface_type |= EGL_PIXMAP_BIT;
+   /* pixmap surfaces should be EGL_SINGLE_BUFFER */
+   if (nconf->buffer_mask & (1 << NATIVE_ATTACHMENT_FRONT_LEFT)) {
+      if (nconf->pixmap_bit)
+         surface_type |= EGL_PIXMAP_BIT;
+   }
+   /* the others surfaces should be EGL_BACK_BUFFER (or settable) */
+   if (nconf->buffer_mask & (1 << NATIVE_ATTACHMENT_BACK_LEFT)) {
+      if (nconf->window_bit)
+         surface_type |= EGL_WINDOW_BIT;
 #ifdef EGL_MESA_screen_surface
-   if (nconf->scanout_bit)
-      surface_type |= EGL_SCREEN_BIT_MESA;
+      if (nconf->scanout_bit)
+         surface_type |= EGL_SCREEN_BIT_MESA;
 #endif
-
-   if (nconf->buffer_mask & (1 << NATIVE_ATTACHMENT_BACK_LEFT))
       surface_type |= EGL_PBUFFER_BIT;
+   }
 
    conf->Conformant = api_mask;
    conf->RenderableType = api_mask;
@@ -252,13 +256,9 @@ egl_g3d_init_config(_EGLDriver *drv, _EGLDisplay *dpy,
                     int preserve_buffer, int max_swap_interval)
 {
    struct egl_g3d_config *gconf = egl_g3d_config(conf);
-   EGLint buffer_mask, api_mask;
+   EGLint buffer_mask;
    EGLBoolean valid;
 
-   /* skip single-buffered configs */
-   if (!(nconf->buffer_mask & (1 << NATIVE_ATTACHMENT_BACK_LEFT)))
-      return EGL_FALSE;
-
    buffer_mask = 0x0;
    if (nconf->buffer_mask & (1 << NATIVE_ATTACHMENT_FRONT_LEFT))
       buffer_mask |= ST_ATTACHMENT_FRONT_LEFT_MASK;
@@ -275,22 +275,12 @@ egl_g3d_init_config(_EGLDriver *drv, _EGLDisplay *dpy,
    gconf->stvis.accum_format = PIPE_FORMAT_NONE;
    gconf->stvis.samples = 0;
 
+   /* will be overridden per surface */
    gconf->stvis.render_buffer = (buffer_mask & ST_ATTACHMENT_BACK_LEFT_MASK) ?
       ST_ATTACHMENT_BACK_LEFT : ST_ATTACHMENT_FRONT_LEFT;
 
-   api_mask = dpy->ClientAPIsMask;
-   /* this is required by EGL, not by OpenGL ES */
-   if (nconf->window_bit &&
-       gconf->stvis.render_buffer != ST_ATTACHMENT_BACK_LEFT)
-      api_mask &= ~(EGL_OPENGL_ES_BIT | EGL_OPENGL_ES2_BIT);
-
-   if (!api_mask) {
-      _eglLog(_EGL_DEBUG, "no state tracker supports config 0x%x",
-            nconf->native_visual_id);
-   }
-
    valid = init_config_attributes(&gconf->base,
-         nconf, api_mask, depth_stencil_format,
+         nconf, dpy->ClientAPIsMask, depth_stencil_format,
          preserve_buffer, max_swap_interval);
    if (!valid) {
       _eglLog(_EGL_DEBUG, "skip invalid config 0x%x", nconf->native_visual_id);
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 a15c988c8bc..aeabccfaf18 100644
--- a/src/gallium/state_trackers/egl/common/egl_g3d_api.c
+++ b/src/gallium/state_trackers/egl/common/egl_g3d_api.c
@@ -324,7 +324,8 @@ egl_g3d_create_surface(_EGLDriver *drv, _EGLDisplay *dpy, _EGLConfig *conf,
    }
 
    gsurf->stvis = gconf->stvis;
-   if (gsurf->base.RenderBuffer == EGL_SINGLE_BUFFER)
+   if (gsurf->base.RenderBuffer == EGL_SINGLE_BUFFER &&
+       gconf->stvis.buffer_mask & ST_ATTACHMENT_FRONT_LEFT_MASK)
       gsurf->stvis.render_buffer = ST_ATTACHMENT_FRONT_LEFT;
 
    gsurf->stfbi = egl_g3d_create_st_framebuffer(&gsurf->base);