Refactor and fix core vblank support

Consolidate support for synchronizing to and retrieving vblank counters.  Also
fix the core vblank code to return monotonic MSC counters, which are required
by some GLX extensions.  Adding support for multiple pipes to a low level
driver is fairly easy, the Intel 965 driver provides simple example code (see
intel_buffers.c:intelWindowMoved()).

The new code bumps the media stream counter extension version to 2 and adds a
new getDrawableMSC callback.  This callback takes a drawablePrivate pointer,
which is used to calculate the MSC value seen by clients based on the actual
vblank counter(s) returned from the kernel.  The new drawable private fields
are as follows:
  - vblSeq - used for tracking vblank counts for buffer swapping
  - vblFlags - flags (e.g. current pipe), updated by low level driver
  - msc_base - MSC counter from the last time the current pipe changed
  - vblank_base - kernel DRM vblank counter from the last time the pipe changed

Using the above variables, the core vblank code (in vblank.c) can calculate a
monotonic MSC value.  The low level DRI drivers are responsible for updating
the current pipe (by setting VBLANK_FLAG_SECONDARY for example in vblFlags)
along with msc_base and vblank_base whenever the pipe associated with a given
drawable changes (again, see intelWindowMoved for an example of this).

Drivers should fill in the GetDrawableMSC DriverAPIRec field to point to
driDrawableGetMSC32 and add code for pipe switching as outlined above to fully
support the new scheme.

5 files changed, 10 insertions, 14 deletions

diff --git a/src/mesa/drivers/dri/r128/r128_context.c b/src/mesa/drivers/dri/r128/r128_context.c
index c9fe11f38b..25efe5e4cd 100644
--- a/src/mesa/drivers/dri/r128/r128_context.c
+++ b/src/mesa/drivers/dri/r128/r128_context.c
@@ -113,6 +113,7 @@ GLboolean r128CreateContext( const __GLcontextModes *glVisual,
 {
    GLcontext *ctx, *shareCtx;
    __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
+   __DRIdrawablePrivate *dPriv = driContextPriv->driDrawablePriv;
    struct dd_function_table functions;
    r128ContextPtr rmesa;
    r128ScreenPtr r128scrn;
@@ -262,7 +263,7 @@ GLboolean r128CreateContext( const __GLcontextModes *glVisual,
    r128DDInitSpanFuncs( ctx );
    r128DDInitState( rmesa );
 
-   rmesa->vblank_flags = (rmesa->r128Screen->irq != 0)
+   dPriv->vblFlags = (rmesa->r128Screen->irq != 0)
        ? driGetDefaultVBlankFlags(&rmesa->optionCache) : VBLANK_FLAG_NO_IRQ;
 
    driContextPriv->driverPrivate = (void *)rmesa;
@@ -347,8 +348,7 @@ r128MakeCurrent( __DRIcontextPrivate *driContextPriv,
 	 newR128Ctx->dirty = R128_UPLOAD_ALL;
       }
 
-      driDrawableInitVBlank( driDrawPriv, newR128Ctx->vblank_flags,
-			     &newR128Ctx->vbl_seq );
+      driDrawableInitVBlank( driDrawPriv );
       newR128Ctx->driDrawable = driDrawPriv;
 
       _mesa_make_current( newR128Ctx->glCtx,
diff --git a/src/mesa/drivers/dri/r128/r128_context.h b/src/mesa/drivers/dri/r128/r128_context.h
index c51dd7fa58..3f7416e9cc 100644
--- a/src/mesa/drivers/dri/r128/r128_context.h
+++ b/src/mesa/drivers/dri/r128/r128_context.h
@@ -210,11 +210,6 @@ struct r128_context {
    GLuint c_textureBytes;
    GLuint c_vertexBuffers;
 
-   /* VBI
-    */
-   GLuint vbl_seq;
-   GLuint vblank_flags;
-
    /* Configuration cache
     */
    driOptionCache optionCache;
diff --git a/src/mesa/drivers/dri/r128/r128_ioctl.c b/src/mesa/drivers/dri/r128/r128_ioctl.c
index b0dba7d04e..e04c0872f0 100644
--- a/src/mesa/drivers/dri/r128/r128_ioctl.c
+++ b/src/mesa/drivers/dri/r128/r128_ioctl.c
@@ -249,7 +249,7 @@ static int r128WaitForFrameCompletion( r128ContextPtr rmesa )
 
 /* Copy the back color buffer to the front color buffer.
  */
-void r128CopyBuffer( const __DRIdrawablePrivate *dPriv )
+void r128CopyBuffer( __DRIdrawablePrivate *dPriv )
 {
    r128ContextPtr rmesa;
    GLint nbox, i, ret;
@@ -282,7 +282,7 @@ void r128CopyBuffer( const __DRIdrawablePrivate *dPriv )
    }
 
    UNLOCK_HARDWARE( rmesa );
-   driWaitForVBlank( dPriv, &rmesa->vbl_seq, rmesa->vblank_flags, &missed_target );
+   driWaitForVBlank( dPriv, &dPriv->vblSeq, dPriv->vblFlags, &missed_target );
    LOCK_HARDWARE( rmesa );
 
    nbox = dPriv->numClipRects;	/* must be in locked region */
@@ -328,7 +328,7 @@ void r128CopyBuffer( const __DRIdrawablePrivate *dPriv )
 #endif
 }
 
-void r128PageFlip( const __DRIdrawablePrivate *dPriv )
+void r128PageFlip( __DRIdrawablePrivate *dPriv )
 {
    r128ContextPtr rmesa;
    GLint ret;
@@ -359,7 +359,7 @@ void r128PageFlip( const __DRIdrawablePrivate *dPriv )
    }
 
    UNLOCK_HARDWARE( rmesa );
-   driWaitForVBlank( dPriv, &rmesa->vbl_seq, rmesa->vblank_flags, &missed_target );
+   driWaitForVBlank( dPriv, &dPriv->vblSeq, dPriv->vblFlags, &missed_target );
    LOCK_HARDWARE( rmesa );
 
    /* The kernel will have been initialized to perform page flipping
diff --git a/src/mesa/drivers/dri/r128/r128_ioctl.h b/src/mesa/drivers/dri/r128/r128_ioctl.h
index 95779f09be..0f9d11fe69 100644
--- a/src/mesa/drivers/dri/r128/r128_ioctl.h
+++ b/src/mesa/drivers/dri/r128/r128_ioctl.h
@@ -86,8 +86,8 @@ extern void r128ReadDepthSpanLocked( r128ContextPtr rmesa,
 extern void r128ReadDepthPixelsLocked( r128ContextPtr rmesa, GLuint n,
 				       const GLint x[], const GLint y[] );
 
-extern void r128CopyBuffer( const __DRIdrawablePrivate *dPriv );
-extern void r128PageFlip( const __DRIdrawablePrivate *dPriv );
+extern void r128CopyBuffer( __DRIdrawablePrivate *dPriv );
+extern void r128PageFlip( __DRIdrawablePrivate *dPriv );
 void r128WaitForVBlank( r128ContextPtr rmesa );
 
 extern void r128WaitForIdleLocked( r128ContextPtr rmesa );
diff --git a/src/mesa/drivers/dri/r128/r128_screen.c b/src/mesa/drivers/dri/r128/r128_screen.c
index 9d65ebddf7..719f9367c0 100644
--- a/src/mesa/drivers/dri/r128/r128_screen.c
+++ b/src/mesa/drivers/dri/r128/r128_screen.c
@@ -411,6 +411,7 @@ static struct __DriverAPIRec r128API = {
    .UnbindContext   = r128UnbindContext,
    .GetSwapInfo     = NULL,
    .GetMSC          = driGetMSC32,
+   .GetDrawableMSC  = driDrawableGetMSC32,
    .WaitForMSC      = driWaitForMSC32,
    .WaitForSBC      = NULL,
    .SwapBuffersMSC  = NULL