gallium: Clean up driver clear() interface.

Only allows clearing currently bound buffers, but colour and depth/stencil in
a single call.

1 files changed, 60 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_clear.h b/src/gallium/auxiliary/util/u_clear.h
new file mode 100644
index 00000000000..7c16b32cf9f
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_clear.h
@@ -0,0 +1,60 @@
+/**************************************************************************
+ * 
+ * Copyright 2009 VMware, Inc.  All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+/* Authors:
+ *    Michel Dänzer
+ */
+
+
+#include "pipe/p_context.h"
+#include "pipe/p_state.h"
+#include "util/u_pack_color.h"
+
+
+/**
+ * Clear the given buffers to the specified values.
+ * No masking, no scissor (clear entire buffer).
+ */
+static INLINE void
+util_clear(struct pipe_context *pipe,
+           struct pipe_framebuffer_state *framebuffer, unsigned buffers,
+           const float *rgba, double depth, unsigned stencil)
+{
+   if (buffers & PIPE_CLEAR_COLOR) {
+      struct pipe_surface *ps = framebuffer->cbufs[0];
+      unsigned color;
+
+      util_pack_color(rgba, ps->format, &color);
+      pipe->surface_fill(pipe, ps, 0, 0, ps->width, ps->height, color);
+   }
+
+   if (buffers & PIPE_CLEAR_DEPTHSTENCIL) {
+      struct pipe_surface *ps = framebuffer->zsbuf;
+
+      pipe->surface_fill(pipe, ps, 0, 0, ps->width, ps->height,
+                         util_pack_z_stencil(ps->format, depth, stencil));
+   }
+}