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_resource.h"
  28 #include "virgl_screen.h"
  29
  30 static void *virgl_buffer_transfer_map(struct pipe_context *ctx,
  31                                        struct pipe_resource *resource,
  32                                        unsigned level,
  33                                        unsigned usage,
  34                                        const struct pipe_box *box,
  35                                        struct pipe_transfer **transfer)
  36 {
  37    struct virgl_context *vctx = virgl_context(ctx);
  38    struct virgl_screen *vs = virgl_screen(ctx->screen);
  39    struct virgl_resource *vbuf = virgl_resource(resource);
  40    struct virgl_transfer *trans;
  41    void *ptr;
  42    bool readback;
  43    bool doflushwait = false;
  44
  45    if (usage & PIPE_TRANSFER_READ)
  46       doflushwait = true;
  47    else
  48       doflushwait = virgl_res_needs_flush_wait(vctx, vbuf, usage);
  49
  50    if (doflushwait)
  51       ctx->flush(ctx, NULL, 0);
  52
  53    trans = virgl_resource_create_transfer(ctx, resource, &vbuf->metadata, level,
  54                                           usage, box);
  55
  56    readback = virgl_res_needs_readback(vctx, vbuf, usage);
  57    if (readback)
  58       vs->vws->transfer_get(vs->vws, vbuf->hw_res, box, trans->base.stride,
  59                             trans->l_stride, trans->offset, level);
  60
  61    if (!(usage & PIPE_TRANSFER_UNSYNCHRONIZED))
  62       doflushwait = true;
  63
  64    if (doflushwait || readback)
  65       vs->vws->resource_wait(vs->vws, vbuf->hw_res);
  66
  67    ptr = vs->vws->resource_map(vs->vws, vbuf->hw_res);
  68    if (!ptr) {
  69       return NULL;
  70    }
  71
  72    *transfer = &trans->base;
  73    return ptr + trans->offset;
  74 }
  75
  76 static void virgl_buffer_transfer_unmap(struct pipe_context *ctx,
  77                                         struct pipe_transfer *transfer)
  78 {
  79    struct virgl_context *vctx = virgl_context(ctx);
  80    struct virgl_transfer *trans = virgl_transfer(transfer);
  81    struct virgl_resource *vbuf = virgl_resource(transfer->resource);
  82
  83    if (trans->base.usage & PIPE_TRANSFER_WRITE) {
  84       struct virgl_screen *vs = virgl_screen(ctx->screen);
  85       if (transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT) {
  86          if (trans->range.end <= trans->range.start)
  87             goto out;
  88
  89          transfer->box.x += trans->range.start;
  90          transfer->box.width = trans->range.end - trans->range.start;
  91          trans->offset = transfer->box.x;
  92       }
  93
  94       vctx->num_transfers++;
  95       vs->vws->transfer_put(vs->vws, vbuf->hw_res,
  96                             &transfer->box, trans->base.stride,
  97                             trans->l_stride, trans->offset,
  98                             transfer->level);
  99
 100    }
 101
 102 out:
 103    virgl_resource_destroy_transfer(vctx, trans);
 104 }
 105
 106 static void virgl_buffer_transfer_flush_region(struct pipe_context *ctx,
 107                                                struct pipe_transfer *transfer,
 108                                                const struct pipe_box *box)
 109 {
 110    struct virgl_resource *vbuf = virgl_resource(transfer->resource);
 111    struct virgl_transfer *trans = virgl_transfer(transfer);
 112
 113    /*
 114     * FIXME: This is not optimal.  For example,
 115     *
 116     * glMapBufferRange(.., 0, 100, GL_MAP_FLUSH_EXPLICIT_BIT)
 117     * glFlushMappedBufferRange(.., 25, 30)
 118     * glFlushMappedBufferRange(.., 65, 70)
 119     *
 120     * We'll end up flushing 25 --> 70.
 121     */
 122    util_range_add(&trans->range, box->x, box->x + box->width);
 123    vbuf->clean[0] = FALSE;
 124 }
 125
 126 static const struct u_resource_vtbl virgl_buffer_vtbl =
 127 {
 128    u_default_resource_get_handle,            /* get_handle */
 129    virgl_resource_destroy,                   /* resource_destroy */
 130    virgl_buffer_transfer_map,                /* transfer_map */
 131    virgl_buffer_transfer_flush_region,       /* transfer_flush_region */
 132    virgl_buffer_transfer_unmap,              /* transfer_unmap */
 133 };
 134
 135 void virgl_buffer_init(struct virgl_resource *res)
 136 {
 137    res->u.vtbl = &virgl_buffer_vtbl;
 138 }