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    enum virgl_transfer_map_type map_type;
  42
  43    trans = virgl_resource_create_transfer(&vctx->transfer_pool, resource,
  44                                           &vbuf->metadata, level, usage, box);
  45
  46    map_type = virgl_resource_transfer_prepare(vctx, trans);
  47    switch (map_type) {
  48    case VIRGL_TRANSFER_MAP_HW_RES:
  49       trans->hw_res_map = vs->vws->resource_map(vs->vws, vbuf->hw_res);
  50       break;
  51    case VIRGL_TRANSFER_MAP_ERROR:
  52    default:
  53       trans->hw_res_map = NULL;
  54       break;
  55    }
  56
  57    if (!trans->hw_res_map) {
  58       virgl_resource_destroy_transfer(&vctx->transfer_pool, trans);
  59       return NULL;
  60    }
  61
  62    if (usage & PIPE_TRANSFER_WRITE)
  63        util_range_add(&vbuf->valid_buffer_range, box->x, box->x + box->width);
  64
  65    *transfer = &trans->base;
  66    return trans->hw_res_map + trans->offset;
  67 }
  68
  69 static void virgl_buffer_transfer_unmap(struct pipe_context *ctx,
  70                                         struct pipe_transfer *transfer)
  71 {
  72    struct virgl_context *vctx = virgl_context(ctx);
  73    struct virgl_transfer *trans = virgl_transfer(transfer);
  74
  75    if (trans->base.usage & PIPE_TRANSFER_WRITE) {
  76       if (transfer->usage & PIPE_TRANSFER_FLUSH_EXPLICIT) {
  77          if (trans->range.end <= trans->range.start) {
  78             virgl_resource_destroy_transfer(&vctx->transfer_pool, trans);
  79             return;
  80          }
  81
  82          transfer->box.x += trans->range.start;
  83          transfer->box.width = trans->range.end - trans->range.start;
  84          trans->offset = transfer->box.x;
  85       }
  86
  87       virgl_transfer_queue_unmap(&vctx->queue, trans);
  88    } else
  89       virgl_resource_destroy_transfer(&vctx->transfer_pool, trans);
  90 }
  91
  92 static void virgl_buffer_transfer_flush_region(struct pipe_context *ctx,
  93                                                struct pipe_transfer *transfer,
  94                                                const struct pipe_box *box)
  95 {
  96    struct virgl_transfer *trans = virgl_transfer(transfer);
  97
  98    /*
  99     * FIXME: This is not optimal.  For example,
 100     *
 101     * glMapBufferRange(.., 0, 100, GL_MAP_FLUSH_EXPLICIT_BIT)
 102     * glFlushMappedBufferRange(.., 25, 30)
 103     * glFlushMappedBufferRange(.., 65, 70)
 104     *
 105     * We'll end up flushing 25 --> 70.
 106     */
 107    util_range_add(&trans->range, box->x, box->x + box->width);
 108 }
 109
 110 static const struct u_resource_vtbl virgl_buffer_vtbl =
 111 {
 112    u_default_resource_get_handle,            /* get_handle */
 113    virgl_resource_destroy,                   /* resource_destroy */
 114    virgl_buffer_transfer_map,                /* transfer_map */
 115    virgl_buffer_transfer_flush_region,       /* transfer_flush_region */
 116    virgl_buffer_transfer_unmap,              /* transfer_unmap */
 117 };
 118
 119 void virgl_buffer_init(struct virgl_resource *res)
 120 {
 121    res->u.vtbl = &virgl_buffer_vtbl;
 122 }