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      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    struct brw_bo *buffer;     /* the low-level buffer manager's buffer handle */
     42 
     43    struct brw_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     * Tracking for what range of the BO may contain valid data.
     75     *
     76     * Users may create a large buffer object and only fill part of it
     77     * with valid data.  This is a conservative estimate of what part
     78     * of the buffer contains valid data that we have to preserve.
     79     */
     80    uint32_t valid_data_start;
     81    uint32_t valid_data_end;
     82    /** @} */
     83 
     84    /**
     85     * If we've avoided stalls/blits using the active tracking, flag the buffer
     86     * for (occasional) stalling in the future to avoid getting stuck in a
     87     * cycle of blitting on buffer wraparound.
     88     */
     89    bool prefer_stall_to_blit;
     90    /** @} */
     91 };
     92 
     93 
     94 /* Get the bm buffer associated with a GL bufferobject:
     95  */
     96 struct brw_bo *intel_bufferobj_buffer(struct brw_context *brw,
     97                                       struct intel_buffer_object *obj,
     98                                       uint32_t offset,
     99                                       uint32_t size,
    100                                       bool write);
    101 
    102 void intel_upload_data(struct brw_context *brw,
    103                        const void *data,
    104                        uint32_t size,
    105                        uint32_t alignment,
    106                        struct brw_bo **out_bo,
    107                        uint32_t *out_offset);
    108 
    109 void *intel_upload_space(struct brw_context *brw,
    110                          uint32_t size,
    111                          uint32_t alignment,
    112                          struct brw_bo **out_bo,
    113                          uint32_t *out_offset);
    114 
    115 void intel_upload_finish(struct brw_context *brw);
    116 
    117 /* Hook the bufferobject implementation into mesa:
    118  */
    119 void intelInitBufferObjectFuncs(struct dd_function_table *functions);
    120 
    121 static inline struct intel_buffer_object *
    122 intel_buffer_object(struct gl_buffer_object *obj)
    123 {
    124    return (struct intel_buffer_object *) obj;
    125 }
    126 
    127 #endif
    128