91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
/**************************************************************************
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*
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* Copyright 2012 Marek Olšák <maraeo@gmail.com>
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS AND/OR THEIR SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "util/u_helpers.h"
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#include "util/u_inlines.h"
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/**
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* This function is used to copy an array of pipe_vertex_buffer structures,
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* while properly referencing the pipe_vertex_buffer::buffer member.
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*
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* enabled_buffers is updated such that the bits corresponding to the indices
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* of disabled buffers are set to 0 and the enabled ones are set to 1.
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*
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* \sa util_copy_framebuffer_state
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*/
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void util_set_vertex_buffers_mask(struct pipe_vertex_buffer *dst,
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uint32_t *enabled_buffers,
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const struct pipe_vertex_buffer *src,
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unsigned start_slot, unsigned count)
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{
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unsigned i;
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uint32_t bitmask = 0;
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dst += start_slot;
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if (src) {
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for (i = 0; i < count; i++) {
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if (src[i].buffer || src[i].user_buffer) {
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bitmask |= 1 << i;
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}
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pipe_resource_reference(&dst[i].buffer, src[i].buffer);
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}
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/* Copy over the other members of pipe_vertex_buffer. */
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memcpy(dst, src, count * sizeof(struct pipe_vertex_buffer));
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*enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
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*enabled_buffers |= bitmask << start_slot;
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}
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else {
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/* Unreference the buffers. */
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for (i = 0; i < count; i++) {
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pipe_resource_reference(&dst[i].buffer, NULL);
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dst[i].user_buffer = NULL;
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}
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*enabled_buffers &= ~(((1ull << count) - 1) << start_slot);
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}
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}
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/**
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* Same as util_set_vertex_buffers_mask, but it only returns the number
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* of bound buffers.
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*/
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void util_set_vertex_buffers_count(struct pipe_vertex_buffer *dst,
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unsigned *dst_count,
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const struct pipe_vertex_buffer *src,
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unsigned start_slot, unsigned count)
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{
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uint32_t enabled_buffers = (1ull << *dst_count) - 1;
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util_set_vertex_buffers_mask(dst, &enabled_buffers, src, start_slot,
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count);
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*dst_count = util_last_bit(enabled_buffers);
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}
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