Enable GLX_SGI_make_current_read for tdfx.

Implement GLX_SGI_make_current_read for tdfx.  Remove annoying debug
printf in tdfxSwapBuffers.  Updated a comment in drirenderbuffer.h to
note that the tdfx driver uses a flag that was previously only used by
s3v.

This code was tested with glxgears, wincopy, and manywin.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/common/drirenderbuffer.h b/src/mesa/drivers/dri/common/drirenderbuffer.h
index cd73b781741..747f92fcdbe 100644
--- a/src/mesa/drivers/dri/common/drirenderbuffer.h
+++ b/src/mesa/drivers/dri/common/drirenderbuffer.h
@@ -52,8 +52,11 @@ typedef struct {
     */
    GLboolean depthHasSurface;
 
-   /* XXX this is for s3v only.  A handy flag to know if this is the back
-    * color buffer.
+   /**
+    * A handy flag to know if this is the back color buffer.
+    * 
+    * \note
+    * This is currently only used by s3v and tdfx.
     */
    GLboolean backBuffer;
 } driRenderbuffer;