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

   1 /*
   2  * Copyright 2003 VMware, Inc.
   3  * Copyright © 2007 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * @file intel_upload.c
  27  *
  28  * Batched upload via BOs.
  29  */
  30
  31 #include "main/imports.h"
  32 #include "main/mtypes.h"
  33 #include "main/macros.h"
  34 #include "main/bufferobj.h"
  35
  36 #include "brw_context.h"
  37 #include "intel_blit.h"
  38 #include "intel_buffer_objects.h"
  39 #include "intel_batchbuffer.h"
  40 #include "intel_fbo.h"
  41 #include "intel_mipmap_tree.h"
  42
  43 #include "brw_context.h"
  44
  45 #define INTEL_UPLOAD_SIZE (64*1024)
  46
  47 void
  48 intel_upload_finish(struct brw_context *brw)
  49 {
  50    assert((brw->upload.bo == NULL) == (brw->upload.map == NULL));
  51    if (!brw->upload.bo)
  52       return;
  53
  54    brw_bo_unmap(brw->upload.bo);
  55    brw_bo_unreference(brw->upload.bo);
  56    brw->upload.bo = NULL;
  57    brw->upload.map = NULL;
  58    brw->upload.next_offset = 0;
  59 }
  60
  61 /**
  62  * Interface for getting memory for uploading streamed data to the GPU
  63  *
  64  * In most cases, streamed data (for GPU state structures, for example) is
  65  * uploaded through brw_state_batch(), since that interface allows relocations
  66  * from the streamed space returned to other BOs.  However, that interface has
  67  * the restriction that the amount of space allocated has to be "small" (see
  68  * estimated_max_prim_size in brw_draw.c).
  69  *
  70  * This interface, on the other hand, is able to handle arbitrary sized
  71  * allocation requests, though it will batch small allocations into the same
  72  * BO for efficiency and reduced memory footprint.
  73  *
  74  * \note The returned pointer is valid only until intel_upload_finish(), which
  75  * will happen at batch flush or the next
  76  * intel_upload_space()/intel_upload_data().
  77  *
  78  * \param out_bo Pointer to a BO, which must point to a valid BO or NULL on
  79  * entry, and will have a reference to the new BO containing the state on
  80  * return.
  81  *
  82  * \param out_offset Offset within the buffer object that the data will land.
  83  */
  84 void *
  85 intel_upload_space(struct brw_context *brw,
  86                    uint32_t size,
  87                    uint32_t alignment,
  88                    struct brw_bo **out_bo,
  89                    uint32_t *out_offset)
  90 {
  91    uint32_t offset;
  92
  93    offset = ALIGN_NPOT(brw->upload.next_offset, alignment);
  94    if (brw->upload.bo && offset + size > brw->upload.bo->size) {
  95       intel_upload_finish(brw);
  96       offset = 0;
  97    }
  98
  99    assert((brw->upload.bo == NULL) == (brw->upload.map == NULL));
 100    if (!brw->upload.bo) {
 101       brw->upload.bo = brw_bo_alloc(brw->bufmgr, "streamed data",
 102                                     MAX2(INTEL_UPLOAD_SIZE, size), 4096);
 103       brw->upload.map = brw_bo_map(brw, brw->upload.bo, MAP_READ | MAP_WRITE);
 104    }
 105
 106    brw->upload.next_offset = offset + size;
 107
 108    *out_offset = offset;
 109    if (*out_bo != brw->upload.bo) {
 110       brw_bo_unreference(*out_bo);
 111       *out_bo = brw->upload.bo;
 112       brw_bo_reference(brw->upload.bo);
 113    }
 114
 115    return brw->upload.map + offset;
 116 }
 117
 118 /**
 119  * Handy interface to upload some data to temporary GPU memory quickly.
 120  *
 121  * References to this memory should not be retained across batch flushes.
 122  */
 123 void
 124 intel_upload_data(struct brw_context *brw,
 125                   const void *data,
 126                   uint32_t size,
 127                   uint32_t alignment,
 128                   struct brw_bo **out_bo,
 129                   uint32_t *out_offset)
 130 {
 131    void *dst = intel_upload_space(brw, size, alignment, out_bo, out_offset);
 132    memcpy(dst, data, size);
 133 }