1 files changed, 93 insertions, 0 deletions
diff --git a/mesalib/src/mesa/state_tracker/st_atom_stipple.c b/mesalib/src/mesa/state_tracker/st_atom_stipple.c
new file mode 100644
index 000000000..5efea315c
--- /dev/null
+++ b/mesalib/src/mesa/state_tracker/st_atom_stipple.c
@@ -0,0 +1,93 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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.
+ * 
+ **************************************************************************/
+
+ /*
+  * \brief polygon stipple state
+  *
+  * Authors:
+  *   Brian Paul
+  */
+ 
+
+#include <assert.h>
+
+#include "st_context.h"
+#include "st_atom.h"
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+
+
+/**
+ * OpenGL's polygon stipple is indexed with window coordinates in which
+ * the origin (0,0) is the lower-left corner of the window.
+ * With Gallium, the origin is the upper-left corner of the window.
+ * To convert GL's polygon stipple to what gallium expects we need to
+ * invert the pattern vertically and rotate the stipple rows according
+ * to the window height.
+ */
+static void
+invert_stipple(GLuint dest[32], const GLuint src[32], GLuint winHeight)
+{
+   GLuint i;
+
+   for (i = 0; i < 32; i++) {
+      dest[i] = src[(winHeight - 1 - i) & 0x1f];
+   }
+}
+
+
+
+static void 
+update_stipple( struct st_context *st )
+{
+   const GLuint sz = sizeof(st->state.poly_stipple);
+   assert(sz == sizeof(st->ctx->PolygonStipple));
+
+   if (memcmp(st->state.poly_stipple, st->ctx->PolygonStipple, sz)) {
+      /* state has changed */
+      struct pipe_poly_stipple newStipple;
+
+      memcpy(st->state.poly_stipple, st->ctx->PolygonStipple, sz);
+
+      invert_stipple(newStipple.stipple, st->ctx->PolygonStipple,
+                     st->ctx->DrawBuffer->Height);
+
+      st->pipe->set_polygon_stipple(st->pipe, &newStipple);
+   }
+}
+
+
+/** Update the stipple when the pattern or window height changes */
+const struct st_tracked_state st_update_polygon_stipple = {
+   "st_update_polygon_stipple",				/* name */
+   {							/* dirty */
+      (_NEW_POLYGONSTIPPLE |
+       _NEW_BUFFERS),					/* mesa */
+      0,						/* st */
+   },
+   update_stipple					/* update */
+};