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/r300/radeon_context.c b/src/mesa/drivers/dri/r300/radeon_context.c
index 0a957816db..4e351dd66b 100644
--- a/src/mesa/drivers/dri/r300/radeon_context.c
+++ b/src/mesa/drivers/dri/r300/radeon_context.c
@@ -231,7 +231,7 @@ void radeonSwapBuffers(__DRIdrawablePrivate * dPriv)
 			if (radeon->doPageFlip) {
 				radeonPageFlip(dPriv);
 			} else {
-				radeonCopyBuffer(dPriv);
+			    radeonCopyBuffer(dPriv, NULL);
 			}
 		}
 	} else {
@@ -241,6 +241,31 @@ void 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__);
+    }
+}
 
 /* Force the context `c' to be the current context and associate with it
  * buffer `b'.