DRI2: add config query extension

Add a new DRI2 configuration query extension.  Allows for DRI2 client
code to query for common DRI2 configuration options.

2 files changed, 50 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index f1bbd38612..16d4cc5e17 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -467,6 +467,41 @@ dri2CreateNewDrawable(__DRIscreen *screen,
     return pdraw;
 }
 
+static int
+dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
+{
+   if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
+      return -1;
+
+   *val = driQueryOptionb(&screen->optionCache, var);
+
+   return 0;
+}
+
+static int
+dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
+{
+   if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
+       !driCheckOption(&screen->optionCache, var, DRI_ENUM))
+      return -1;
+
+    *val = driQueryOptioni(&screen->optionCache, var);
+
+    return 0;
+}
+
+static int
+dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
+{
+   if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
+      return -1;
+
+    *val = driQueryOptionf(&screen->optionCache, var);
+
+    return 0;
+}
+
+
 static void dri_get_drawable(__DRIdrawable *pdp)
 {
     pdp->refcount++;
@@ -739,6 +774,7 @@ dri2CreateNewScreen(int scrn, int fd,
     static const __DRIextension *emptyExtensionList[] = { NULL };
     __DRIscreen *psp;
     drmVersionPtr version;
+    driOptionCache options;
 
     if (driDriverAPI.InitScreen2 == NULL)
         return NULL;
@@ -771,6 +807,9 @@ dri2CreateNewScreen(int scrn, int fd,
 
     psp->DriverAPI = driDriverAPI;
 
+    driParseOptionInfo(&options, __dri2ConfigOptions, __dri2NConfigOptions);
+    driParseConfigFiles(&psp->optionCache, &options, psp->myNum, "dri2");
+
     return psp;
 }
 
@@ -813,6 +852,13 @@ const __DRIdri2Extension driDRI2Extension = {
     dri2CreateNewContext,
 };
 
+const __DRI2configQueryExtension dri2ConfigQueryExtension = {
+   { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
+   dri2ConfigQueryb,
+   dri2ConfigQueryi,
+   dri2ConfigQueryf,
+};
+
 static int
 driFrameTracking(__DRIdrawable *drawable, GLboolean enable)
 {
diff --git a/src/mesa/drivers/dri/common/dri_util.h b/src/mesa/drivers/dri/common/dri_util.h
index 038a81604f..0fe6f1e246 100644
--- a/src/mesa/drivers/dri/common/dri_util.h
+++ b/src/mesa/drivers/dri/common/dri_util.h
@@ -51,6 +51,7 @@
 #include <drm.h>
 #include <drm_sarea.h>
 #include <xf86drm.h>
+#include "xmlconfig.h"
 #include "main/glheader.h"
 #include "GL/internal/glcore.h"
 #include "GL/internal/dri_interface.h"
@@ -70,6 +71,7 @@ extern const __DRIcopySubBufferExtension driCopySubBufferExtension;
 extern const __DRIswapControlExtension driSwapControlExtension;
 extern const __DRIframeTrackingExtension driFrameTrackingExtension;
 extern const __DRImediaStreamCounterExtension driMediaStreamCounterExtension;
+extern const __DRI2configQueryExtension dri2ConfigQueryExtension;
 
 /**
  * Used by DRI_VALIDATE_DRAWABLE_INFO
@@ -527,6 +529,8 @@ struct __DRIscreenRec {
 
     /* The lock actually in use, old sarea or DRI2 */
     drmLock *lock;
+
+    driOptionCache optionCache;
 };
 
 extern void