dri: Change __DriverApiRec::CreateContext to take a struct for attribs

Previously the CreateContext method of __DriverApiRec took a set of
arguments to describe the attribute values from the window system API's
CreateContextAttribs function. As more attributes get added this could
quickly get unworkable and every new attribute needs a modification for
every driver.

To fix that, pass the attribute values in a struct instead.  The struct
has a bitmask to specify which members are used. The first three members
(two for the GL version and one for the flags) are always set. If the
bit is not set in the attribute mask then it can be assumed the
attribute has the default value. Drivers will error if unknown bits in
the mask are set.

Reviewed-by: Adam Jackson <[email protected]>
Reviewed-by: Nicolai Hähnle <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Signed-off-by: Neil Roberts <[email protected]>

1 files changed, 9 insertions, 7 deletions

diff --git a/src/mesa/drivers/dri/swrast/swrast.c b/src/mesa/drivers/dri/swrast/swrast.c
index 6b71d806f09..f9bd1b9d560 100644
--- a/src/mesa/drivers/dri/swrast/swrast.c
+++ b/src/mesa/drivers/dri/swrast/swrast.c
@@ -752,11 +752,7 @@ static GLboolean
 dri_create_context(gl_api api,
 		   const struct gl_config * visual,
 		   __DRIcontext * cPriv,
-		   unsigned major_version,
-		   unsigned minor_version,
-		   uint32_t flags,
-		   bool notify_reset,
-		   unsigned priority,
+		   const struct __DriverContextConfig *ctx_config,
 		   unsigned *error,
 		   void *sharedContextPrivate)
 {
@@ -770,7 +766,13 @@ dri_create_context(gl_api api,
 
     /* Flag filtering is handled in dri2CreateContextAttribs.
      */
-    (void) flags;
+    (void) ctx_config->flags;
+
+    /* The swrast driver doesn't understand any of the attributes */
+    if (ctx_config->attribute_mask != 0) {
+	*error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
+	return false;
+    }
 
     ctx = CALLOC_STRUCT(dri_context);
     if (ctx == NULL) {
@@ -797,7 +799,7 @@ dri_create_context(gl_api api,
 	goto context_fail;
     }
 
-    driContextSetFlags(mesaCtx, flags);
+    driContextSetFlags(mesaCtx, ctx_config->flags);
 
     /* create module contexts */
     _swrast_CreateContext( mesaCtx );