src/mesa/drivers/dri/i965/brw_state_batch.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "brw_state.h"
  33 #include "intel_batchbuffer.h"
  34 #include "main/imports.h"
  35 #include "../glsl/ralloc.h"
  36
  37 static void
  38 brw_track_state_batch(struct brw_context *brw,
  39                       enum state_struct_type type,
  40                       uint32_t offset,
  41                       int size)
  42 {
  43    struct intel_batchbuffer *batch = &brw->intel.batch;
  44
  45    if (!brw->state_batch_list) {
  46       /* Our structs are always aligned to at least 32 bytes, so
  47        * our array doesn't need to be any larger
  48        */
  49       brw->state_batch_list = ralloc_size(brw, sizeof(*brw->state_batch_list) *
  50                                           batch->bo->size / 32);
  51    }
  52
  53    brw->state_batch_list[brw->state_batch_count].offset = offset;
  54    brw->state_batch_list[brw->state_batch_count].size = size;
  55    brw->state_batch_list[brw->state_batch_count].type = type;
  56    brw->state_batch_count++;
  57 }
  58
  59 /**
  60  * Allocates a block of space in the batchbuffer for indirect state.
  61  *
  62  * We don't want to allocate separate BOs for every bit of indirect
  63  * state in the driver.  It means overallocating by a significant
  64  * margin (4096 bytes, even if the object is just a 20-byte surface
  65  * state), and more buffers to walk and count for aperture size checking.
  66  *
  67  * However, due to the restrictions inposed by the aperture size
  68  * checking performance hacks, we can't have the batch point at a
  69  * separate indirect state buffer, because once the batch points at
  70  * it, no more relocations can be added to it.  So, we sneak these
  71  * buffers in at the top of the batchbuffer.
  72  */
  73 void *
  74 brw_state_batch(struct brw_context *brw,
  75                 enum state_struct_type type,
  76                 int size,
  77                 int alignment,
  78                 uint32_t *out_offset)
  79 {
  80    struct intel_batchbuffer *batch = &brw->intel.batch;
  81    uint32_t offset;
  82
  83    assert(size < batch->bo->size);
  84    offset = ROUND_DOWN_TO(batch->state_batch_offset - size, alignment);
  85
  86    /* If allocating from the top would wrap below the batchbuffer, or
  87     * if the batch's used space (plus the reserved pad) collides with our
  88     * space, then flush and try again.
  89     */
  90    if (batch->state_batch_offset < size ||
  91        offset < 4*batch->used + batch->reserved_space) {
  92       intel_batchbuffer_flush(&brw->intel);
  93       offset = ROUND_DOWN_TO(batch->state_batch_offset - size, alignment);
  94    }
  95
  96    batch->state_batch_offset = offset;
  97
  98    if (unlikely(INTEL_DEBUG & DEBUG_BATCH))
  99       brw_track_state_batch(brw, type, offset, size);
 100
 101    *out_offset = offset;
 102    return batch->map + (offset>>2);
 103 }