src/gallium/drivers/virgl/virgl_buffer.c

   1 /*
   2  * Copyright 2014, 2015 Red Hat.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "util/u_inlines.h"
  25 #include "util/u_memory.h"
  26 #include "virgl_context.h"
  27 #include "virgl_encode.h"
  28 #include "virgl_resource.h"
  29 #include "virgl_screen.h"
  30
  31 static void virgl_buffer_transfer_unmap(struct pipe_context *ctx,
  32                                         struct pipe_transfer *transfer)
  33 {
  34    struct virgl_context *vctx = virgl_context(ctx);
  35    struct virgl_transfer *trans = virgl_transfer(transfer);
  36
  37    if (trans->base.usage & PIPE_TRANSFER_WRITE) {
  38       if (transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT) {
  39          if (trans->range.end <= trans->range.start) {
  40             virgl_resource_destroy_transfer(vctx, trans);
  41             return;
  42          }
  43
  44          transfer->box.x += trans->range.start;
  45          transfer->box.width = trans->range.end - trans->range.start;
  46          trans->offset = transfer->box.x;
  47       }
  48
  49       if (trans->copy_src_hw_res) {
  50          virgl_encode_copy_transfer(vctx, trans);
  51          virgl_resource_destroy_transfer(vctx, trans);
  52       } else {
  53          virgl_transfer_queue_unmap(&vctx->queue, trans);
  54       }
  55    } else
  56       virgl_resource_destroy_transfer(vctx, trans);
  57 }
  58
  59 static void virgl_buffer_transfer_flush_region(struct pipe_context *ctx,
  60                                                struct pipe_transfer *transfer,
  61                                                const struct pipe_box *box)
  62 {
  63    struct virgl_transfer *trans = virgl_transfer(transfer);
  64
  65    /*
  66     * FIXME: This is not optimal.  For example,
  67     *
  68     * glMapBufferRange(.., 0, 100, GL_MAP_FLUSH_EXPLICIT_BIT)
  69     * glFlushMappedBufferRange(.., 25, 30)
  70     * glFlushMappedBufferRange(.., 65, 70)
  71     *
  72     * We'll end up flushing 25 --> 70.
  73     */
  74    util_range_add(&trans->range, box->x, box->x + box->width);
  75 }
  76
  77 static const struct u_resource_vtbl virgl_buffer_vtbl =
  78 {
  79    u_default_resource_get_handle,            /* get_handle */
  80    virgl_resource_destroy,                   /* resource_destroy */
  81    virgl_resource_transfer_map,              /* transfer_map */
  82    virgl_buffer_transfer_flush_region,       /* transfer_flush_region */
  83    virgl_buffer_transfer_unmap,              /* transfer_unmap */
  84 };
  85
  86 void virgl_buffer_init(struct virgl_resource *res)
  87 {
  88    res->u.vtbl = &virgl_buffer_vtbl;
  89 }