1 files changed, 27 insertions, 5 deletions

diff --git a/src/mesa/drivers/dri/radeon/radeon_common.c b/src/mesa/drivers/dri/radeon/radeon_common.c
index 9b64c21685..2a2b16a54b 100644
--- a/src/mesa/drivers/dri/radeon/radeon_common.c
+++ b/src/mesa/drivers/dri/radeon/radeon_common.c
@@ -641,6 +641,27 @@ void radeonCopySubBuffer(__DRIdrawablePrivate * dPriv,
 	}
 }
 
+/**
+ * Check if we're about to draw into the front color buffer.
+ * If so, set the intel->front_buffer_dirty field to true.
+ */
+void
+radeon_check_front_buffer_rendering(GLcontext *ctx)
+{
+	radeonContextPtr radeon = RADEON_CONTEXT(ctx);
+	const struct gl_framebuffer *fb = ctx->DrawBuffer;
+
+	if (fb->Name == 0) {
+		/* drawing to window system buffer */
+		if (fb->_NumColorDrawBuffers > 0) {
+			if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
+				radeon->front_buffer_dirty = GL_TRUE;
+			}
+		}
+	}
+}
+
+
 void radeon_draw_buffer(GLcontext *ctx, struct gl_framebuffer *fb)
 {
 	radeonContextPtr radeon = RADEON_CONTEXT(ctx);
@@ -817,7 +838,7 @@ void radeonDrawBuffer( GLcontext *ctx, GLenum mode )
        */
 		if (!was_front_buffer_rendering && radeon->is_front_buffer_rendering) {
 			radeon_update_renderbuffers(radeon->dri.context,
-				radeon->dri.context->driDrawablePriv);
+				radeon->dri.context->driDrawablePriv, GL_FALSE);
       }
 	}
 
@@ -834,7 +855,7 @@ void radeonReadBuffer( GLcontext *ctx, GLenum mode )
 
 		if (!was_front_buffer_reading && rmesa->is_front_buffer_reading) {
 			radeon_update_renderbuffers(rmesa->dri.context,
-						    rmesa->dri.context->driReadablePriv);
+						    rmesa->dri.context->driReadablePriv, GL_FALSE);
 	 	}
 	}
 	/* nothing, until we implement h/w glRead/CopyPixels or CopyTexImage */
@@ -885,9 +906,9 @@ void radeon_viewport(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei he
 		if (radeon->is_front_buffer_rendering) {
 			ctx->Driver.Flush(ctx);
 		}
-		radeon_update_renderbuffers(driContext, driContext->driDrawablePriv);
+		radeon_update_renderbuffers(driContext, driContext->driDrawablePriv, GL_FALSE);
 		if (driContext->driDrawablePriv != driContext->driReadablePriv)
-			radeon_update_renderbuffers(driContext, driContext->driReadablePriv);
+			radeon_update_renderbuffers(driContext, driContext->driReadablePriv, GL_FALSE);
 	}
 
 	old_viewport = ctx->Driver.Viewport;
@@ -1095,7 +1116,7 @@ void radeonFlush(GLcontext *ctx)
 	   then no point flushing anything at all.
 	*/
 	if (!radeon->dma.flush && !radeon->cmdbuf.cs->cdw && is_empty_list(&radeon->dma.reserved))
-		return;
+		goto flush_front;
 
 	if (radeon->dma.flush)
 		radeon->dma.flush( ctx );
@@ -1103,6 +1124,7 @@ void radeonFlush(GLcontext *ctx)
 	if (radeon->cmdbuf.cs->cdw)
 		rcommonFlushCmdBuf(radeon, __FUNCTION__);
 
+flush_front:
 	if ((ctx->DrawBuffer->Name == 0) && radeon->front_buffer_dirty) {
 		__DRIscreen *const screen = radeon->radeonScreen->driScreen;