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

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