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"),
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   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,
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  22  ***************************************************************************/
  23
  24 #include "util/u_memory.h"
  25 #include "swr_context.h"
  26 #include "swr_screen.h"
  27 #include "swr_scratch.h"
  28 #include "swr_fence_work.h"
  29 #include "api.h"
  30
  31
  32 void *
  33 swr_copy_to_scratch_space(struct swr_context *ctx,
  34                           struct swr_scratch_space *space,
  35                           const void *user_buffer,
  36                           unsigned int size)
  37 {
  38    void *ptr;
  39    assert(space);
  40    assert(size);
  41
  42    if (size >= 2048) { /* XXX TODO create KNOB_ for this */
  43       /* Use per draw SwrAllocDrawContextMemory for larger copies */
  44       ptr = SwrAllocDrawContextMemory(ctx->swrContext, size, 4);
  45    } else {
  46       /* Allocate enough so that MAX_DRAWS_IN_FLIGHT sets fit. */
  47       unsigned int max_size_in_flight = size * KNOB_MAX_DRAWS_IN_FLIGHT;
  48
  49       /* Need to grow space */
  50       if (max_size_in_flight > space->current_size) {
  51          space->current_size = max_size_in_flight;
  52
  53          if (space->base) {
  54             /* defer delete, use aligned-free */
  55             struct swr_screen *screen = swr_screen(ctx->pipe.screen);
  56             swr_fence_work_free(screen->flush_fence, space->base, true);
  57             space->base = NULL;
  58          }
  59
  60          if (!space->base) {
  61             space->base = (uint8_t *)AlignedMalloc(space->current_size,
  62                                                    sizeof(void *));
  63             space->head = (void *)space->base;
  64          }
  65       }
  66
  67       /* Wrap */
  68       if (((uint8_t *)space->head + size)
  69           >= ((uint8_t *)space->base + space->current_size)) {
  70          space->head = space->base;
  71       }
  72
  73       ptr = space->head;
  74       space->head = (uint8_t *)space->head + size;
  75    }
  76
  77    /* Copy user_buffer to scratch */
  78    if (user_buffer)
  79       memcpy(ptr, user_buffer, size);
  80
  81    return ptr;
  82 }
  83
  84
  85 void
  86 swr_init_scratch_buffers(struct swr_context *ctx)
  87 {
  88    struct swr_scratch_buffers *scratch;
  89
  90    scratch = CALLOC_STRUCT(swr_scratch_buffers);
  91    ctx->scratch = scratch;
  92 }
  93
  94 void
  95 swr_destroy_scratch_buffers(struct swr_context *ctx)
  96 {
  97    struct swr_scratch_buffers *scratch = ctx->scratch;
  98
  99    if (scratch) {
 100       AlignedFree(scratch->vs_constants.base);
 101       AlignedFree(scratch->fs_constants.base);
 102       AlignedFree(scratch->vertex_buffer.base);
 103       AlignedFree(scratch->index_buffer.base);
 104       FREE(scratch);
 105    }
 106 }