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

   1 /**************************************************************************
   2  *
   3  * Copyright 2005 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  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;
  46    void *range_map_buffer;
  47    unsigned int range_map_offset;
  48
  49    /** @{
  50     * Tracking for what range of the BO may currently be in use by the GPU.
  51     *
  52     * Users often want to either glBufferSubData() or glMapBufferRange() a
  53     * buffer object where some subset of it is busy on the GPU, without either
  54     * stalling or doing an extra blit (since our blits are extra expensive,
  55     * given that we have to reupload most of the 3D state when switching
  56     * rings).  We wish they'd just use glMapBufferRange() with the
  57     * UNSYNC|INVALIDATE_RANGE flag or the INVALIDATE_BUFFER flag, but lots
  58     * don't.
  59     *
  60     * To work around apps, we track what range of the BO we might have used on
  61     * the GPU as vertex data, tranform feedback output, buffer textures, etc.,
  62     * and just do glBufferSubData() with an unsynchronized map when they're
  63     * outside of that range.
  64     *
  65     * If gpu_active_start > gpu_active_end, then the GPU is not currently
  66     * accessing the BO (and we can map it without synchronization).
  67     */
  68    uint32_t gpu_active_start;
  69    uint32_t gpu_active_end;
  70
  71    /**
  72     * If we've avoided stalls/blits using the active tracking, flag the buffer
  73     * for (occasional) stalling in the future to avoid getting stuck in a
  74     * cycle of blitting on buffer wraparound.
  75     */
  76    bool prefer_stall_to_blit;
  77    /** @} */
  78 };
  79
  80
  81 /* Get the bm buffer associated with a GL bufferobject:
  82  */
  83 drm_intel_bo *intel_bufferobj_buffer(struct brw_context *brw,
  84                                      struct intel_buffer_object *obj,
  85                                      uint32_t offset,
  86                                      uint32_t size);
  87
  88 void intel_upload_data(struct brw_context *brw,
  89                        const void *ptr, GLuint size, GLuint align,
  90                        drm_intel_bo **return_bo,
  91                        GLuint *return_offset);
  92
  93 void *intel_upload_map(struct brw_context *brw,
  94                        GLuint size, GLuint align);
  95 void intel_upload_unmap(struct brw_context *brw,
  96                         const void *ptr, GLuint size, GLuint align,
  97                         drm_intel_bo **return_bo,
  98                         GLuint *return_offset);
  99
 100 void intel_upload_finish(struct brw_context *brw);
 101
 102 /* Hook the bufferobject implementation into mesa:
 103  */
 104 void intelInitBufferObjectFuncs(struct dd_function_table *functions);
 105
 106 static inline struct intel_buffer_object *
 107 intel_buffer_object(struct gl_buffer_object *obj)
 108 {
 109    return (struct intel_buffer_object *) obj;
 110 }
 111
 112 #endif