src/gallium/drivers/swr/swr_scratch.cpp

   1 /****************************************************************************
   2  * Copyright (C) 2015 Intel Corporation.   All Rights Reserved.
   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  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  ***************************************************************************/
  23
  24 #include "util/u_memory.h"
  25 #include "swr_context.h"
  26 #include "swr_scratch.h"
  27 #include "api.h"
  28
  29
  30 void *
  31 swr_copy_to_scratch_space(struct swr_context *ctx,
  32                           struct swr_scratch_space *space,
  33                           const void *user_buffer,
  34                           unsigned int size)
  35 {
  36    void *ptr;
  37    assert(space);
  38    assert(size);
  39
  40    if (size >= 2048) { /* XXX TODO create KNOB_ for this */
  41       /* Use per draw SwrAllocDrawContextMemory for larger copies */
  42       ptr = SwrAllocDrawContextMemory(ctx->swrContext, size, 4);
  43    } else {
  44       /* Allocate enough so that MAX_DRAWS_IN_FLIGHT sets fit. */
  45       unsigned int max_size_in_flight = size * KNOB_MAX_DRAWS_IN_FLIGHT;
  46
  47       /* Need to grow space */
  48       if (max_size_in_flight > space->current_size) {
  49          /* Must idle the pipeline, this is infrequent */
  50          SwrWaitForIdle(ctx->swrContext);
  51
  52          space->current_size = max_size_in_flight;
  53
  54          if (space->base) {
  55             align_free(space->base);
  56             space->base = NULL;
  57          }
  58
  59          if (!space->base) {
  60             space->base = (uint8_t *)align_malloc(space->current_size, 4);
  61             space->head = (void *)space->base;
  62          }
  63       }
  64
  65       /* Wrap */
  66       if (((uint8_t *)space->head + size)
  67           >= ((uint8_t *)space->base + space->current_size)) {
  68          /*
  69           * TODO XXX: Should add a fence on wrap.  Assumption is that
  70           * current_space >> size, and there are at least MAX_DRAWS_IN_FLIGHT
  71           * draws in scratch.  So fence would always be met on wrap.  A fence
  72           * would ensure that first frame in buffer is done before wrapping.
  73           * If fence ever needs to be waited on, can increase buffer size.
  74           * So far in testing, this hasn't been necessary.
  75           */
  76          space->head = space->base;
  77       }
  78
  79       ptr = space->head;
  80       space->head = (uint8_t *)space->head + size;
  81    }
  82
  83    /* Copy user_buffer to scratch */
  84    if (user_buffer)
  85       memcpy(ptr, user_buffer, size);
  86
  87    return ptr;
  88 }
  89
  90
  91 void
  92 swr_init_scratch_buffers(struct swr_context *ctx)
  93 {
  94    struct swr_scratch_buffers *scratch;
  95
  96    scratch = CALLOC_STRUCT(swr_scratch_buffers);
  97    ctx->scratch = scratch;
  98 }
  99
 100 void
 101 swr_destroy_scratch_buffers(struct swr_context *ctx)
 102 {
 103    struct swr_scratch_buffers *scratch = ctx->scratch;
 104
 105    if (scratch) {
 106       if (scratch->vs_constants.base)
 107          align_free(scratch->vs_constants.base);
 108       if (scratch->fs_constants.base)
 109          align_free(scratch->fs_constants.base);
 110       if (scratch->vertex_buffer.base)
 111          align_free(scratch->vertex_buffer.base);
 112       if (scratch->index_buffer.base)
 113          align_free(scratch->index_buffer.base);
 114       FREE(scratch);
 115    }
 116 }