src/gallium/drivers/svga/include/svga3d_caps.h

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  25
  26 /*
  27  * svga3d_caps.h --
  28  *
  29  *       Definitions for SVGA3D hardware capabilities.  Capabilities
  30  *       are used to query for optional rendering features during
  31  *       driver initialization. The capability data is stored as very
  32  *       basic key/value dictionary within the "FIFO register" memory
  33  *       area at the beginning of BAR2.
  34  *
  35  *       Note that these definitions are only for 3D capabilities.
  36  *       The SVGA device also has "device capabilities" and "FIFO
  37  *       capabilities", which are non-3D-specific and are stored as
  38  *       bitfields rather than key/value pairs.
  39  */
  40
  41 #ifndef _SVGA3D_CAPS_H_
  42 #define _SVGA3D_CAPS_H_
  43
  44 #define SVGA_FIFO_3D_CAPS_SIZE   (SVGA_FIFO_3D_CAPS_LAST - \
  45                                   SVGA_FIFO_3D_CAPS + 1)
  46
  47
  48 /*
  49  * SVGA3dCapsRecordType
  50  *
  51  *    Record types that can be found in the caps block.
  52  *    Related record types are grouped together numerically so that
  53  *    SVGA3dCaps_FindRecord() can be applied on a range of record
  54  *    types.
  55  */
  56
  57 typedef enum {
  58    SVGA3DCAPS_RECORD_UNKNOWN        = 0,
  59    SVGA3DCAPS_RECORD_DEVCAPS_MIN    = 0x100,
  60    SVGA3DCAPS_RECORD_DEVCAPS        = 0x100,
  61    SVGA3DCAPS_RECORD_DEVCAPS_MAX    = 0x1ff,
  62 } SVGA3dCapsRecordType;
  63
  64
  65 /*
  66  * SVGA3dCapsRecordHeader
  67  *
  68  *    Header field leading each caps block record. Contains the offset (in
  69  *    register words, NOT bytes) to the next caps block record (or the end
  70  *    of caps block records which will be a zero word) and the record type
  71  *    as defined above.
  72  */
  73
  74 typedef
  75 struct SVGA3dCapsRecordHeader {
  76    uint32 length;
  77    SVGA3dCapsRecordType type;
  78 }
  79 SVGA3dCapsRecordHeader;
  80
  81
  82 /*
  83  * SVGA3dCapsRecord
  84  *
  85  *    Caps block record; "data" is a placeholder for the actual data structure
  86  *    contained within the record; for example a record containing a FOOBAR
  87  *    structure would be of size "sizeof(SVGA3dCapsRecordHeader) +
  88  *    sizeof(FOOBAR)".
  89  */
  90
  91 typedef
  92 struct SVGA3dCapsRecord {
  93    SVGA3dCapsRecordHeader header;
  94    uint32 data[1];
  95 }
  96 SVGA3dCapsRecord;
  97
  98
  99 typedef uint32 SVGA3dCapPair[2];
 100
 101
 102 /*
 103  *----------------------------------------------------------------------
 104  *
 105  * SVGA3dCaps_FindRecord
 106  *
 107  *    Finds the record with the highest-valued type within the given range
 108  *    in the caps block.
 109  *
 110  *    Result: pointer to found record, or NULL if not found.
 111  *
 112  *----------------------------------------------------------------------
 113  */
 114
 115 static INLINE SVGA3dCapsRecord *
 116 SVGA3dCaps_FindRecord(const uint32 *capsBlock,
 117                       SVGA3dCapsRecordType recordTypeMin,
 118                       SVGA3dCapsRecordType recordTypeMax)
 119 {
 120    SVGA3dCapsRecord *record, *found = NULL;
 121    uint32 offset;
 122
 123    /*
 124     * Search linearly through the caps block records for the specified type.
 125     */
 126    for (offset = 0; capsBlock[offset] != 0; offset += capsBlock[offset]) {
 127       record = (SVGA3dCapsRecord *) (capsBlock + offset);
 128       if ((record->header.type >= recordTypeMin) &&
 129           (record->header.type <= recordTypeMax) &&
 130           (!found || (record->header.type > found->header.type))) {
 131          found = record;
 132       }
 133    }
 134
 135    return found;
 136 }
 137
 138
 139 #endif // _SVGA3D_CAPS_H_