From f1e1b2ed167b63409a88ba489418e407fce68f21 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Michel=20D=C3=A4nzer?= <michel@tungstengraphics.com>
Date: Tue, 10 Jul 2007 10:54:51 +0200
Subject: [PATCH] i915tex: Only wait for vblank when really necessary.

This avoids superfluous waits for vblank timing out under some circumstances.
---
 src/mesa/drivers/dri/i915tex/intel_buffers.c | 10 +++++---
 src/mesa/drivers/dri/i915tex/intel_context.c | 27 +++++++++++++++-----
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/src/mesa/drivers/dri/i915tex/intel_buffers.c b/src/mesa/drivers/dri/i915tex/intel_buffers.c
index 62ff54b0075..15d02f8e2cf 100644
--- a/src/mesa/drivers/dri/i915tex/intel_buffers.c
+++ b/src/mesa/drivers/dri/i915tex/intel_buffers.c
@@ -316,7 +316,8 @@ intelWindowMoved(struct intel_context *intel)
 	 flags = intel_fb->vblank_flags & ~VBLANK_FLAG_SECONDARY;
       }
 
-      if (flags != intel_fb->vblank_flags) {
+      if (flags != intel_fb->vblank_flags && intel_fb->vblank_flags &&
+	  !(intel_fb->vblank_flags & VBLANK_FLAG_NO_IRQ)) {
 	 drmVBlank vbl;
 	 int i;
 
@@ -327,7 +328,9 @@ intelWindowMoved(struct intel_context *intel)
 	 }
 
 	 for (i = 0; i < intel_fb->pf_num_pages; i++) {
-	    if (!intel_fb->color_rb[i])
+	    if (!intel_fb->color_rb[i] ||
+		(intel_fb->vbl_waited - intel_fb->color_rb[i]->vbl_pending) <=
+		(1<<23))
 	       continue;
 
 	    vbl.request.sequence = intel_fb->color_rb[i]->vbl_pending;
@@ -828,7 +831,8 @@ intelScheduleSwap(const __DRIdrawablePrivate * dPriv, GLboolean *missed_target)
    drm_i915_vblank_swap_t swap;
    GLboolean ret;
 
-   if ((intel_fb->vblank_flags & VBLANK_FLAG_NO_IRQ) ||
+   if (!intel_fb->vblank_flags ||
+       (intel_fb->vblank_flags & VBLANK_FLAG_NO_IRQ) ||
        intelScreen->current_rotation != 0 ||
        intelScreen->drmMinor < (intel_fb->pf_active ? 9 : 6))
       return GL_FALSE;
diff --git a/src/mesa/drivers/dri/i915tex/intel_context.c b/src/mesa/drivers/dri/i915tex/intel_context.c
index c927dca8e5a..5334efd63d4 100644
--- a/src/mesa/drivers/dri/i915tex/intel_context.c
+++ b/src/mesa/drivers/dri/i915tex/intel_context.c
@@ -619,12 +619,23 @@ intelMakeCurrent(__DRIcontextPrivate * driContextPriv,
       if (intel->ctx.DrawBuffer == &intel_fb->Base) {
 
 	 if (intel->driDrawable != driDrawPriv) {
-	    intel_fb->vblank_flags = (intel->intelScreen->irq_active != 0)
-	       ? driGetDefaultVBlankFlags(&intel->optionCache)
-	       : VBLANK_FLAG_NO_IRQ;
-	    (*dri_interface->getUST) (&intel_fb->swap_ust);
-	    driDrawableInitVBlank(driDrawPriv, intel_fb->vblank_flags,
-				  &intel_fb->vbl_seq);
+	    if (driDrawPriv->pdraw->swap_interval == (unsigned)-1) {
+	       int i;
+
+	       intel_fb->vblank_flags = (intel->intelScreen->irq_active != 0)
+		  ? driGetDefaultVBlankFlags(&intel->optionCache)
+		 : VBLANK_FLAG_NO_IRQ;
+
+	       (*dri_interface->getUST) (&intel_fb->swap_ust);
+	       driDrawableInitVBlank(driDrawPriv, intel_fb->vblank_flags,
+				     &intel_fb->vbl_seq);
+	       intel_fb->vbl_waited = intel_fb->vbl_seq;
+
+	       for (i = 0; i < (intel->intelScreen->third.handle ? 3 : 2); i++) {
+		  if (intel_fb->color_rb[i])
+		     intel_fb->color_rb[i]->vbl_pending = intel_fb->vbl_seq;
+	       }
+	    }
 	    intel->driDrawable = driDrawPriv;
 	    intelWindowMoved(intel);
 	 }
@@ -741,7 +752,9 @@ void LOCK_HARDWARE( struct intel_context *intel )
 				    BUFFER_BACK_LEFT);
     }
 
-    if (intel_rb && (intel_fb->vbl_waited - intel_rb->vbl_pending) > (1<<23)) {
+    if (intel_rb && intel_fb->vblank_flags &&
+	!(intel_fb->vblank_flags & VBLANK_FLAG_NO_IRQ) &&
+	(intel_fb->vbl_waited - intel_rb->vbl_pending) > (1<<23)) {
 	drmVBlank vbl;
 
 	vbl.request.type = DRM_VBLANK_ABSOLUTE;
-- 
2.30.2