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Diffstat (limited to 'src/gallium/auxiliary/draw/draw_pt_elts.c')
-rw-r--r--src/gallium/auxiliary/draw/draw_pt_elts.c89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pt_elts.c b/src/gallium/auxiliary/draw/draw_pt_elts.c
new file mode 100644
index 0000000000..88f4d9f495
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_pt_elts.c
@@ -0,0 +1,89 @@
+/**************************************************************************
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+ /*
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "draw/draw_pt.h"
+#include "draw/draw_private.h"
+
+/* Neat get_elt func that also works for varrays drawing by encoding
+ * the start value into a pointer.
+ */
+
+static unsigned elt_uint( const void *elts, unsigned idx )
+{
+ return *(((const uint *)elts) + idx);
+}
+
+static unsigned elt_ushort( const void *elts, unsigned idx )
+{
+ return *(((const ushort *)elts) + idx);
+}
+
+static unsigned elt_ubyte( const void *elts, unsigned idx )
+{
+ return *(((const ubyte *)elts) + idx);
+}
+
+static unsigned elt_vert( const void *elts, unsigned idx )
+{
+ /* unsigned index is packed in the pointer */
+ return (unsigned)(uintptr_t)elts + idx;
+}
+
+pt_elt_func draw_pt_elt_func( struct draw_context *draw )
+{
+ switch (draw->pt.user.eltSize) {
+ case 0: return &elt_vert;
+ case 1: return &elt_ubyte;
+ case 2: return &elt_ushort;
+ case 4: return &elt_uint;
+ default: return NULL;
+ }
+}
+
+const void *draw_pt_elt_ptr( struct draw_context *draw,
+ unsigned start )
+{
+ const char *elts = draw->pt.user.elts;
+
+ switch (draw->pt.user.eltSize) {
+ case 0:
+ return (const void *)(((const ubyte *)NULL) + start);
+ case 1:
+ return (const void *)(((const ubyte *)elts) + start);
+ case 2:
+ return (const void *)(((const ushort *)elts) + start);
+ case 4:
+ return (const void *)(((const uint *)elts) + start);
+ default:
+ return NULL;
+ }
+}