Mesa (master): st/dri: Allow dri users to query also driver options

[Thomas Hellstrom]

Module: Mesa
Branch: master
Commit: ff2978b44944790abd860548e111907588a23b0d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ff2978b44944790abd860548e111907588a23b0d

Author: Thomas Hellstrom <thellstrom at vmware.com>
Date:   Fri May  5 05:49:50 2017 -0700

st/dri: Allow dri users to query also driver options

There will be situations where we want to control, for example, the
GLX behaviour based on applications and drivers. So allow DRI users access
to the driver options.

Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/gallium/state_trackers/dri/dri2.c | 65 ++++++++++++++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/src/gallium/state_trackers/dri/dri2.c b/src/gallium/state_trackers/dri/dri2.c
index 20dee03b8b..625678f257 100644
--- a/src/gallium/state_trackers/dri/dri2.c
+++ b/src/gallium/state_trackers/dri/dri2.c
@@ -1678,6 +1678,69 @@ static const __DRI2interopExtension dri2InteropExtension = {
    .export_object = dri2_interop_export_object
 };
 
+/**
+ * \brief the DRI2ConfigQueryExtension configQueryb method
+ */
+static int
+dri2GalliumConfigQueryb(__DRIscreen *sPriv, const char *var,
+                        unsigned char *val)
+{
+   struct dri_screen *screen = dri_screen(sPriv);
+
+   if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
+      return dri2ConfigQueryExtension.configQueryb(sPriv, var, val);
+
+   *val = driQueryOptionb(&screen->optionCache, var);
+
+   return 0;
+}
+
+/**
+ * \brief the DRI2ConfigQueryExtension configQueryi method
+ */
+static int
+dri2GalliumConfigQueryi(__DRIscreen *sPriv, const char *var, int *val)
+{
+   struct dri_screen *screen = dri_screen(sPriv);
+
+   if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
+       !driCheckOption(&screen->optionCache, var, DRI_ENUM))
+      return dri2ConfigQueryExtension.configQueryi(sPriv, var, val);
+
+    *val = driQueryOptioni(&screen->optionCache, var);
+
+    return 0;
+}
+
+/**
+ * \brief the DRI2ConfigQueryExtension configQueryf method
+ */
+static int
+dri2GalliumConfigQueryf(__DRIscreen *sPriv, const char *var, float *val)
+{
+   struct dri_screen *screen = dri_screen(sPriv);
+
+   if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
+      return dri2ConfigQueryExtension.configQueryf(sPriv, var, val);
+
+    *val = driQueryOptionf(&screen->optionCache, var);
+
+    return 0;
+}
+
+/**
+ * \brief the DRI2ConfigQueryExtension struct.
+ *
+ * We first query the driver option cache. Then the dri2 option cache.
+ */
+static const __DRI2configQueryExtension dri2GalliumConfigQueryExtension = {
+   .base = { __DRI2_CONFIG_QUERY, 1 },
+
+   .configQueryb        = dri2GalliumConfigQueryb,
+   .configQueryi        = dri2GalliumConfigQueryi,
+   .configQueryf        = dri2GalliumConfigQueryf,
+};
+
 /*
  * Backend function init_screen.
  */
@@ -1687,7 +1750,7 @@ static const __DRIextension *dri_screen_extensions[] = {
    &dri2FlushExtension.base,
    &dri2ImageExtension.base,
    &dri2RendererQueryExtension.base,
-   &dri2ConfigQueryExtension.base,
+   &dri2GalliumConfigQueryExtension.base,
    &dri2ThrottleExtension.base,
    &dri2FenceExtension.base,
    &dri2InteropExtension.base,