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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);
}
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