Dave Reveman's patch for GLX_MESA_copy_sub_buffer support

1 files changed, 26 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/radeon/radeon_context.c b/src/mesa/drivers/dri/radeon/radeon_context.c
index f546731ad4..791d1a37bc 100644
--- a/src/mesa/drivers/dri/radeon/radeon_context.c
+++ b/src/mesa/drivers/dri/radeon/radeon_context.c
@@ -572,7 +572,7 @@ radeonSwapBuffers( __DRIdrawablePrivate *dPriv )
             radeonPageFlip( dPriv );
          }
          else {
-            radeonCopyBuffer( dPriv );
+	     radeonCopyBuffer( dPriv, NULL );
          }
       }
    }
@@ -582,6 +582,31 @@ radeonSwapBuffers( __DRIdrawablePrivate *dPriv )
    }
 }
 
+void radeonCopySubBuffer(__DRIdrawablePrivate * dPriv,
+			 int x, int y, int w, int h )
+{
+    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
+	radeonContextPtr radeon;
+	GLcontext *ctx;
+
+	radeon = (radeonContextPtr) dPriv->driContextPriv->driverPrivate;
+	ctx = radeon->glCtx;
+
+	if (ctx->Visual.doubleBufferMode) {
+	    drm_clip_rect_t rect;
+	    rect.x1 = x + dPriv->x;
+	    rect.y1 = (dPriv->h - y - h) + dPriv->y;
+	    rect.x2 = rect.x1 + w;
+	    rect.y2 = rect.y1 + h;
+	    _mesa_notifySwapBuffers(ctx);	/* flush pending rendering comands */
+	    radeonCopyBuffer(dPriv, &rect);
+	}
+    } else {
+	/* XXX this shouldn't be an error but we can't handle it for now */
+	_mesa_problem(NULL, "%s: drawable has no context!",
+		      __FUNCTION__);
+    }
+}
 
 /* Make context `c' the current context and bind it to the given
  * drawing and reading surfaces.