78 lines
5.3 KiB
Plaintext
78 lines
5.3 KiB
Plaintext
Field Name Bits Default Description
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ENABLE 0 0x1 Enables tiling, otherwise all tiles receive all polygons.
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POSSIBLE VALUES:
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00 - Tiling disabled.
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01 - Tiling enabled (def).
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PIPE_COUNT 3:1 0x0 Specifies the number of active pipes and contexts (up to
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4 pipes, 1 ctx). When this field is written, it is
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automatically reduced by hardware so as not to use more
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pipes than the number indicated in
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GB_PIPE_SELECT.MAX_PIPES or the number of
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pipes left unmasked GB_PIPE_SELECT.BAD_PIPES.
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The potentially altered value is read back, rather than the
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original value written by software.
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POSSIBLE VALUES:
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00 - RV350 (1 pipe, 1 ctx)
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03 - R300 (2 pipes, 1 ctx)
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06 - R420-3P (3 pipes, 1 ctx)
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07 - R420 (4 pipes, 1 ctx)
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TILE_SIZE 5:4 0x1 Specifies width & height (square), in pixels (only 16, 32
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available).
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POSSIBLE VALUES:
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00 - 8 pixels.
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01 - 16 pixels.
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02 - 32 pixels.
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SUPER_SIZE 8:6 0x0 Specifies number of tiles and config in super chip
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configuration.
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POSSIBLE VALUES:
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00 - 1x1 tile (one 1x1).
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01 - 2 tiles (two 1x1 : ST-A,B).
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02 - 4 tiles (one 2x2).
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03 - 8 tiles (two 2x2 : ST-A,B).
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04 - 16 tiles (one 4x4).
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05 - 32 tiles (two 4x4 : ST-A,B).
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06 - 64 tiles (one 8x8).
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07 - 128 tiles (two 8x8 : ST-A,B).
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SUPER_X 11:9 0x0 X Location of chip within super tile.
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SUPER_Y 14:12 0x0 Y Location of chip within super tile.
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SUPER_TILE 15 0x0 Tile location of chip in a multi super tile config (Super
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size of 2,8,32 or 128).
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POSSIBLE VALUES:
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00 - ST-A tile.
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01 - ST-B tile.
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SUBPIXEL 16 0x0 Specifies the precision of subpixels wrt pixels (12 or 16).
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POSSIBLE VALUES:
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00 - Select 1/12 subpixel precision.
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01 - Select 1/16 subpixel precision.
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QUADS_PER_RAS 18:17 0x0 Specifies the number of quads to be sent to each
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rasterizer in turn when in RV300B or R300B mode
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POSSIBLE VALUES:
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00 - 4 Quads
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01 - 8 Quads
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02 - 16 Quads
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03 - 32 Quads
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BB_SCAN 19 0x0 Specifies whether to use an intercept or bounding box
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based calculation for the first (coarse) scan converter
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POSSIBLE VALUES:
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00 - Use intercept based scan converter
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01 - Use bounding box based scan converter
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ALT_SCAN_EN 20 0x0 Specifies whether to use an altenate scan pattern for the
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coarse scan converter
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POSSIBLE VALUES:
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00 - Use normal left-right scan
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01 - Use alternate left-right-left scan
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ALT_OFFSET 21 0x0 Not used -- should be 0
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POSSIBLE VALUES:
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00 - Not used
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01 - Not used
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SUBPRECISION 22 0x0 Set to 0
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ALT_TILING 23 0x0 Support for 3x2 tiling in 3P mode
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POSSIBLE VALUES:
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00 - Use default tiling in all tiling modes
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01 - Use alternative 3x2 tiling in 3P mode
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Z_EXTENDED 24 0x0 Support for extended setup Z range from [0,1] to [-2,2]
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with per pixel clamping
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POSSIBLE VALUES:
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00 - Use (24.1) Z format, with vertex clamp to [1.0,0.0]
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01 - Use (S25.1) format, with vertex clamp to [2.0,-2.0] and per pixel [1.0,0.0]
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