st/egl_g3d: Add support for probe to native displays.

The functions can be used to check if a display is supported without
creating a struct native_display.  It uses a probe object that can be
shared across drivers.

1 files changed, 37 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/egl_g3d/common/native.h b/src/gallium/state_trackers/egl_g3d/common/native.h
index f374f2e4a6..72a9cec7ef 100644
--- a/src/gallium/state_trackers/egl_g3d/common/native.h
+++ b/src/gallium/state_trackers/egl_g3d/common/native.h
@@ -47,6 +47,27 @@ enum native_attachment {
    NUM_NATIVE_ATTACHMENTS
 };
 
+/**
+ * Enumerations for probe results.
+ */
+enum native_probe_result {
+   NATIVE_PROBE_UNKNOWN,
+   NATIVE_PROBE_FALLBACK,
+   NATIVE_PROBE_SUPPORTED,
+   NATIVE_PROBE_EXACT,
+};
+
+/**
+ * A probe object for display probe.
+ */
+struct native_probe {
+   int magic;
+   EGLNativeDisplayType display;
+   void *data;
+
+   void (*destroy)(struct native_probe *nprobe);
+};
+
 struct native_surface {
    void (*destroy)(struct native_surface *nsurf);
 
@@ -231,6 +252,22 @@ native_attachment_mask_test(uint mask, enum native_attachment att)
    return !!(mask & (1 << att));
 }
 
+/**
+ * Return a probe object for the given display.
+ *
+ * Note that the returned object may be cached and used by different native
+ * display modules.  It allows fast probing when multiple modules probe the
+ * same display.
+ */
+struct native_probe *
+native_create_probe(EGLNativeDisplayType dpy);
+
+/**
+ * Probe the probe object.
+ */
+enum native_probe_result
+native_get_probe_result(struct native_probe *nprobe);
+
 const char *
 native_get_name(void);