1 files changed, 83 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_atom_msaa.c b/src/mesa/state_tracker/st_atom_msaa.c
new file mode 100644
index 00000000000..ea9eb9a6d15
--- /dev/null
+++ b/src/mesa/state_tracker/st_atom_msaa.c
@@ -0,0 +1,83 @@
+/**************************************************************************
+ * 
+ * Copyright 2010 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 THE AUTHORS 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.
+ * 
+ **************************************************************************/
+
+
+#include "st_context.h"
+#include "pipe/p_context.h"
+#include "st_atom.h"
+
+#include "cso_cache/cso_context.h"
+
+
+/* Second state atom for user clip planes:
+ */
+static void update_sample_mask( struct st_context *st )
+{
+   unsigned sample_mask = 0xffffffff;
+   unsigned sample_count = 1;
+   struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
+
+   /* dependency here on bound surface (or rather, sample count) is worrying */
+   if (framebuffer->zsbuf)
+      sample_count = framebuffer->zsbuf->texture->nr_samples;
+   else if (framebuffer->cbufs[0])
+      sample_count = framebuffer->cbufs[0]->texture->nr_samples;
+
+   if (st->ctx->Multisample.Enabled && sample_count > 1) {
+   /* unlike in gallium/d3d10 the mask is only active if msaa is enabled */
+      if (st->ctx->Multisample.SampleCoverage) {
+         unsigned nr_bits;
+         nr_bits = st->ctx->Multisample.SampleCoverageValue * (float)sample_count;
+         /* there's lot of ways how to do this. We just use first few bits,
+            since we have no knowledge of sample positions here. When
+            app-supplied mask though is used too might need to be smarter.
+            Also, there's a interface restriction here in theory it is
+            encouraged this mask not be the same at each pixel. */
+         sample_mask = (1 << nr_bits) - 1;
+         if (st->ctx->Multisample.SampleCoverageInvert)
+            sample_mask = ~sample_mask;
+      }
+      /* TODO merge with app-supplied sample mask */
+   }
+
+   /* mask off unused bits or don't care? */
+
+   if (sample_mask != st->state.sample_mask) {
+      st->state.sample_mask = sample_mask;
+      cso_set_sample_mask(st->cso_context, sample_mask);
+   }
+}
+
+
+const struct st_tracked_state st_update_msaa = {
+   "st_update_msaa",					/* name */
+   {							/* dirty */
+      (_NEW_MULTISAMPLE | _NEW_BUFFERS),		/* mesa */
+      ST_NEW_FRAMEBUFFER,				/* st */
+   },
+   update_sample_mask					/* update */
+};