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

   1 /*
   2  * Copyright 2005 VMware, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #ifndef INTEL_BUFFEROBJ_H
  27 #define INTEL_BUFFEROBJ_H
  28
  29 #include "main/mtypes.h"
  30
  31 struct brw_context;
  32 struct gl_buffer_object;
  33
  34
  35 /**
  36  * Intel vertex/pixel buffer object, derived from Mesa's gl_buffer_object.
  37  */
  38 struct intel_buffer_object
  39 {
  40    struct gl_buffer_object Base;
  41    drm_intel_bo *buffer;     /* the low-level buffer manager's buffer handle */
  42
  43    drm_intel_bo *range_map_bo[MAP_COUNT];
  44
  45    /**
  46     * Alignment offset from the range_map_bo temporary mapping to the returned
  47     * obj->Pointer (caused by GL_ARB_map_buffer_alignment).
  48     */
  49    unsigned map_extra[MAP_COUNT];
  50
  51    /** @{
  52     * Tracking for what range of the BO may currently be in use by the GPU.
  53     *
  54     * Users often want to either glBufferSubData() or glMapBufferRange() a
  55     * buffer object where some subset of it is busy on the GPU, without either
  56     * stalling or doing an extra blit (since our blits are extra expensive,
  57     * given that we have to reupload most of the 3D state when switching
  58     * rings).  We wish they'd just use glMapBufferRange() with the
  59     * UNSYNC|INVALIDATE_RANGE flag or the INVALIDATE_BUFFER flag, but lots
  60     * don't.
  61     *
  62     * To work around apps, we track what range of the BO we might have used on
  63     * the GPU as vertex data, tranform feedback output, buffer textures, etc.,
  64     * and just do glBufferSubData() with an unsynchronized map when they're
  65     * outside of that range.
  66     *
  67     * If gpu_active_start > gpu_active_end, then the GPU is not currently
  68     * accessing the BO (and we can map it without synchronization).
  69     */
  70    uint32_t gpu_active_start;
  71    uint32_t gpu_active_end;
  72
  73    /**
  74     * If we've avoided stalls/blits using the active tracking, flag the buffer
  75     * for (occasional) stalling in the future to avoid getting stuck in a
  76     * cycle of blitting on buffer wraparound.
  77     */
  78    bool prefer_stall_to_blit;
  79    /** @} */
  80 };
  81
  82
  83 /* Get the bm buffer associated with a GL bufferobject:
  84  */
  85 drm_intel_bo *intel_bufferobj_buffer(struct brw_context *brw,
  86                                      struct intel_buffer_object *obj,
  87                                      uint32_t offset,
  88                                      uint32_t size);
  89
  90 void intel_upload_data(struct brw_context *brw,
  91                        const void *data,
  92                        uint32_t size,
  93                        uint32_t alignment,
  94                        drm_intel_bo **out_bo,
  95                        uint32_t *out_offset);
  96
  97 void *intel_upload_space(struct brw_context *brw,
  98                          uint32_t size,
  99                          uint32_t alignment,
 100                          drm_intel_bo **out_bo,
 101                          uint32_t *out_offset);
 102
 103 void intel_upload_finish(struct brw_context *brw);
 104
 105 /* Hook the bufferobject implementation into mesa:
 106  */
 107 void intelInitBufferObjectFuncs(struct dd_function_table *functions);
 108
 109 static inline struct intel_buffer_object *
 110 intel_buffer_object(struct gl_buffer_object *obj)
 111 {
 112    return (struct intel_buffer_object *) obj;
 113 }
 114
 115 #endif