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authormarha <marha@users.sourceforge.net>2012-10-31 09:21:05 +0100
committermarha <marha@users.sourceforge.net>2012-10-31 09:21:05 +0100
commit67c290de36ddc1caae94c0892157ac16b90e4f99 (patch)
tree2103f7ca65b9575500965cb2fc9e03c745e75879 /mesalib/src/gallium/auxiliary/util/u_helpers.c
parent7b3f315a5d8b90dcb0db5512ed91fa700027cb7a (diff)
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mesa git update 31 oct 2012
mesa: 183e122bdfe27f875c3c121964484dae9587c051
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+/**************************************************************************
+ *
+ * Copyright 2012 Marek Olšák <maraeo@gmail.com>
+ * 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 THEIR 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_helpers.h"
+#include "util/u_inlines.h"
+
+/**
+ * This function is used to copy an array of pipe_vertex_buffer structures,
+ * while properly referencing the pipe_vertex_buffer::buffer member.
+ *
+ * enabled_buffers is updated such that the bits corresponding to the indices
+ * of disabled buffers are set to 0 and the enabled ones are set to 1.
+ *
+ * \sa util_copy_framebuffer_state
+ */
+void util_set_vertex_buffers_mask(struct pipe_vertex_buffer *dst,
+ uint32_t *enabled_buffers,
+ const struct pipe_vertex_buffer *src,
+ unsigned start_slot, unsigned count)
+{
+ unsigned i;
+ uint32_t bitmask = 0;
+
+ dst += start_slot;
+
+ if (src) {
+ for (i = 0; i < count; i++) {
+ if (src[i].buffer || src[i].user_buffer) {
+ bitmask |= 1 << i;
+ }
+ pipe_resource_reference(&dst[i].buffer, src[i].buffer);
+ }
+
+ /* Copy over the other members of pipe_vertex_buffer. */
+ memcpy(dst, src, count * sizeof(struct pipe_vertex_buffer));
+
+ *enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
+ *enabled_buffers |= bitmask << start_slot;
+ }
+ else {
+ /* Unreference the buffers. */
+ for (i = 0; i < count; i++) {
+ pipe_resource_reference(&dst[i].buffer, NULL);
+ dst[i].user_buffer = NULL;
+ }
+
+ *enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
+ }
+}
+
+/**
+ * Same as util_set_vertex_buffers_mask, but it only returns the number
+ * of bound buffers.
+ */
+void util_set_vertex_buffers_count(struct pipe_vertex_buffer *dst,
+ unsigned *dst_count,
+ const struct pipe_vertex_buffer *src,
+ unsigned start_slot, unsigned count)
+{
+ uint32_t enabled_buffers = (1ull << *dst_count) - 1;
+
+ util_set_vertex_buffers_mask(dst, &enabled_buffers, src, start_slot,
+ count);
+
+ *dst_count = util_last_bit(enabled_buffers);
+}