src/gallium/drivers/swr/swr_scratch.cpp

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  13  * Software.
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  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(user_buffer);
  39    assert(size);
  40
  41    if (size >= 2048) { /* XXX TODO create KNOB_ for this */
  42       /* Use per draw SwrAllocDrawContextMemory for larger copies */
  43       ptr = SwrAllocDrawContextMemory(ctx->swrContext, size, 4);
  44    } else {
  45       /* Allocate enough so that MAX_DRAWS_IN_FLIGHT sets fit. */
  46       unsigned int max_size_in_flight = size * KNOB_MAX_DRAWS_IN_FLIGHT;
  47
  48       /* Need to grow space */
  49       if (max_size_in_flight > space->current_size) {
  50          /* Must idle the pipeline, this is infrequent */
  51          SwrWaitForIdle(ctx->swrContext);
  52
  53          space->current_size = max_size_in_flight;
  54
  55          if (space->base) {
  56             align_free(space->base);
  57             space->base = NULL;
  58          }
  59
  60          if (!space->base) {
  61             space->base = (uint8_t *)align_malloc(space->current_size, 4);
  62             space->head = (void *)space->base;
  63          }
  64       }
  65
  66       /* Wrap */
  67       if (((uint8_t *)space->head + size)
  68           >= ((uint8_t *)space->base + space->current_size)) {
  69          /*
  70           * TODO XXX: Should add a fence on wrap.  Assumption is that
  71           * current_space >> size, and there are at least MAX_DRAWS_IN_FLIGHT
  72           * draws in scratch.  So fence would always be met on wrap.  A fence
  73           * would ensure that first frame in buffer is done before wrapping.
  74           * If fence ever needs to be waited on, can increase buffer size.
  75           * So far in testing, this hasn't been necessary.
  76           */
  77          space->head = space->base;
  78       }
  79
  80       ptr = space->head;
  81       space->head = (uint8_t *)space->head + size;
  82    }
  83
  84    /* Copy user_buffer to scratch */
  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 }