src/mesa/drivers/dri/i965/intel_buffer_objects.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2005 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #ifndef INTEL_BUFFEROBJ_H
  29 #define INTEL_BUFFEROBJ_H
  30
  31 #include "main/mtypes.h"
  32
  33 struct brw_context;
  34 struct gl_buffer_object;
  35
  36
  37 /**
  38  * Intel vertex/pixel buffer object, derived from Mesa's gl_buffer_object.
  39  */
  40 struct intel_buffer_object
  41 {
  42    struct gl_buffer_object Base;
  43    drm_intel_bo *buffer;     /* the low-level buffer manager's buffer handle */
  44
  45    drm_intel_bo *range_map_bo[MAP_COUNT];
  46
  47    /**
  48     * Alignment offset from the range_map_bo temporary mapping to the returned
  49     * obj->Pointer (caused by GL_ARB_map_buffer_alignment).
  50     */
  51    unsigned map_extra[MAP_COUNT];
  52
  53    /** @{
  54     * Tracking for what range of the BO may currently be in use by the GPU.
  55     *
  56     * Users often want to either glBufferSubData() or glMapBufferRange() a
  57     * buffer object where some subset of it is busy on the GPU, without either
  58     * stalling or doing an extra blit (since our blits are extra expensive,
  59     * given that we have to reupload most of the 3D state when switching
  60     * rings).  We wish they'd just use glMapBufferRange() with the
  61     * UNSYNC|INVALIDATE_RANGE flag or the INVALIDATE_BUFFER flag, but lots
  62     * don't.
  63     *
  64     * To work around apps, we track what range of the BO we might have used on
  65     * the GPU as vertex data, tranform feedback output, buffer textures, etc.,
  66     * and just do glBufferSubData() with an unsynchronized map when they're
  67     * outside of that range.
  68     *
  69     * If gpu_active_start > gpu_active_end, then the GPU is not currently
  70     * accessing the BO (and we can map it without synchronization).
  71     */
  72    uint32_t gpu_active_start;
  73    uint32_t gpu_active_end;
  74
  75    /**
  76     * If we've avoided stalls/blits using the active tracking, flag the buffer
  77     * for (occasional) stalling in the future to avoid getting stuck in a
  78     * cycle of blitting on buffer wraparound.
  79     */
  80    bool prefer_stall_to_blit;
  81    /** @} */
  82 };
  83
  84
  85 /* Get the bm buffer associated with a GL bufferobject:
  86  */
  87 drm_intel_bo *intel_bufferobj_buffer(struct brw_context *brw,
  88                                      struct intel_buffer_object *obj,
  89                                      uint32_t offset,
  90                                      uint32_t size);
  91
  92 void intel_upload_data(struct brw_context *brw,
  93                        const void *data,
  94                        uint32_t size,
  95                        uint32_t alignment,
  96                        drm_intel_bo **out_bo,
  97                        uint32_t *out_offset);
  98
  99 void *intel_upload_space(struct brw_context *brw,
 100                          uint32_t size,
 101                          uint32_t alignment,
 102                          drm_intel_bo **out_bo,
 103                          uint32_t *out_offset);
 104
 105 void intel_upload_finish(struct brw_context *brw);
 106
 107 /* Hook the bufferobject implementation into mesa:
 108  */
 109 void intelInitBufferObjectFuncs(struct dd_function_table *functions);
 110
 111 static inline struct intel_buffer_object *
 112 intel_buffer_object(struct gl_buffer_object *obj)
 113 {
 114    return (struct intel_buffer_object *) obj;
 115 }
 116
 117 #endif