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| author | marha <marha@users.sourceforge.net> | 2011-04-30 16:21:56 +0000 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2011-04-30 16:21:56 +0000 |
| commit | e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f (patch) | |
| tree | 1804d7456ba8f200c7e329d4e6aa67ce4fb1649f /mesalib/src/gallium/auxiliary/util/u_draw.c | |
| parent | 88a78ebea08af461224f815a8380ea5c54186f43 (diff) | |
| parent | 0402d388cb9803652c0f9a52ba7dcb6029fdd0b9 (diff) | |
| download | vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.tar.gz vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.tar.bz2 vcxsrv-e4dd9264ee8d4a20eef0eec8c8bf8cff2473b46f.zip | |
svn merge ^/branches/released .
Diffstat (limited to 'mesalib/src/gallium/auxiliary/util/u_draw.c')
| -rw-r--r-- | mesalib/src/gallium/auxiliary/util/u_draw.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/mesalib/src/gallium/auxiliary/util/u_draw.c b/mesalib/src/gallium/auxiliary/util/u_draw.c new file mode 100644 index 000000000..4f2565edb --- /dev/null +++ b/mesalib/src/gallium/auxiliary/util/u_draw.c @@ -0,0 +1,99 @@ +/**************************************************************************
+ *
+ * Copyright 2011 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 VMWARE 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 "util/u_debug.h"
+#include "util/u_math.h"
+#include "util/u_format.h"
+#include "util/u_draw.h"
+
+
+/**
+ * Returns the largest legal index value for the current set of bound vertex
+ * buffers. Regardless of any other consideration, all vertex lookups need to
+ * be clamped to 0..max_index to prevent an out-of-bound access.
+ */
+unsigned
+util_draw_max_index(
+ const struct pipe_vertex_buffer *vertex_buffers,
+ unsigned nr_vertex_buffers,
+ const struct pipe_vertex_element *vertex_elements,
+ unsigned nr_vertex_elements,
+ const struct pipe_draw_info *info)
+{
+ unsigned max_index;
+ unsigned i;
+
+ max_index = ~0;
+ for (i = 0; i < nr_vertex_elements; i++) {
+ const struct pipe_vertex_element *element =
+ &vertex_elements[i];
+ const struct pipe_vertex_buffer *buffer =
+ &vertex_buffers[element->vertex_buffer_index];
+ unsigned buffer_size;
+ const struct util_format_description *format_desc;
+ unsigned format_size;
+
+ assert(buffer->buffer->height0 == 1);
+ assert(buffer->buffer->depth0 == 1);
+ buffer_size = buffer->buffer->width0;
+
+ format_desc = util_format_description(element->src_format);
+ assert(format_desc->block.width == 1);
+ assert(format_desc->block.height == 1);
+ assert(format_desc->block.bits % 8 == 0);
+ format_size = format_desc->block.bits/8;
+
+ assert(buffer_size - buffer->buffer_offset <= buffer_size);
+ buffer_size -= buffer->buffer_offset;
+
+ assert(buffer_size - element->src_offset <= buffer_size);
+ buffer_size -= element->src_offset;
+
+ assert(buffer_size - format_size <= buffer_size);
+ buffer_size -= format_size;
+
+ if (buffer->stride != 0) {
+ unsigned buffer_max_index;
+
+ buffer_max_index = buffer_size / buffer->stride;
+
+ if (element->instance_divisor == 0) {
+ /* Per-vertex data */
+ max_index = MIN2(max_index, buffer_max_index);
+ }
+ else {
+ /* Per-instance data. Simply make sure the state tracker didn't
+ * request more instances than those that fit in the buffer */
+ assert((info->start_instance + info->instance_count)/element->instance_divisor
+ <= (buffer_max_index + 1));
+ }
+ }
+ }
+
+ return max_index;
+}
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