Reality Display Processor/Commands: Difference between revisions
Texture Rectangle
(Add No Operation, Remove Invalid_31) |
(Texture Rectangle) |
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====<span style="display:none;">0x24 and 0x25 -
----
{| class="wikitable" style="text-align: center; white-space:nowrap;"
! colspan="18"|
|-
| rowspan="4"|Word 0 || 63:48 || — || — || colspan=6| command[5:0] = 0x24 or 0x25 || colspan=8|
|-
| 47:32 || colspan=4|
|-
| 31:16 || — || — || — || — || — || colspan=3| tile[2:0] || colspan=8|
|-
| 15:0 || colspan=4|
|-
| rowspan="4"|Word 1 || 63:48 || colspan=16| s
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| 47:32 || colspan=16| t
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| 31:16 || colspan=16|
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| 15:0 || colspan=16|
|}
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{{#invoke:Register table|definitions
| 61:56 | command[5:0] | 0x24 (Texture_Rectangle) or 0x25 (Texture_Rectangle_Flip)
| 55:44 |
| 43:32 |
| 26:24 | tile[2:0] |
| 23:12 |
| 11:0 |
}}
'''Word 1'''
{{#invoke:Register table|definitions
| 63:48 | s
| 47:32 | t
| 31:16 |
| 15:0 |
}}
Renders a textured rectangle between upper-left coordinate '''(ulx,uly)''' and lower-right coordinate '''(lrx,lry)''', sampling texels using the tile descriptor indexed by '''tile'''. The coordinates '''(s,t)''' are the texture coordinates for the pixel at '''(ulx,uly)''', the derivatives '''dsdx''' and '''dtdy''' are added to these initial coordinates to determine the texture coordinates for every other pixel.
The screen coordinates are subpixel precise, integer values correspond to single pixels. In COPY and FILL mode the fractional bits are ignored and the lower-right bounds are inclusive, while in 1-Cycle and 2-Cycle modes the lower-right bounds are exclusive.
In COPY mode, since several pixels are written per cycle the '''dsdx''' parameter must account for this. It should be set such that it steps 64-bits worth of texels at a time, for example for a 16-bit color image it should be set to 4.0(s10.5) so that the s coordinate is incremented by 4 pixels (64 bits).
In FILL mode this behaves identically to '''Fill Rectangle''', the texturing properties are ignored.
Internally, this command is equivalent to a left-major triangle where <code>dxhdy = dxmdy = dxldy = 0, yl = ym = lry, yh = uly, xl = xm = lrx, xh = ulx</code>
'''Hazards'''
* In 1-Cycle and 2-Cycle mode using attributes such as shade color and per-pixel depth may be ill-defined. (TOVERIFY: It's either always 0 or uses the last value from previous primitives, check which)
====<span style="display:none;">0x26 - Sync Load ====
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In FILL mode, the rectangle is rendered without subpixel accuracy (upper-left coordinates are rounded down, lower-right coordinates are rounded up) and the color is determined solely by the fill color register.
Internally, this command is equivalent to a left-major triangle where <code>dxhdy = dxmdy = dxldy = 0, yl = ym = lry, yh = uly, xl = xm = lrx, xh = ulx</code>
'''Hazards'''
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