On Tue, 18 Nov 2025, Chad Jablonski wrote:
Implement flushing the 128-bit HOST_DATA accumulator to VRAM to enable
text rendering in X. Currently supports only the monochrome
foreground/background datatype with the SRCCOPY ROP.
The flush is broken up into two steps for clarity. First, expansion of the
monochrome bits to the destination color depth. Then the expanded pixels
are clipped and copied into VRAM.
I've tested it with MorphOS and TVPaint but it does not seem to work for
that driver. It never writes HOST_DATA_LAST, only 0 or 0 1 or sometimes
0-7 but never LAST so it must rely on results being flushed after enough
writes. I got some traces like these below in case you can guess what
might be needed for it.
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x1404 DST_OFFSET <- 0x0
ati_mm_write 4 0x1408 DST_PITCH <- 0x100
ati_mm_read 4 0x16c4 DP_DATATYPE -> 0x30d06
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x6
ati_mm_write 4 0x16c8 DP_MIX <- 0xcc0300
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x18103cb
ati_mm_write 4 0x16e8 DEFAULT_SC_BOTTOM_RIGHT <- 0x18903d2
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x18103cb
ati_mm_write 4 0x16f0 SC_BOTTOM_RIGHT <- 0x18903d2
ati_mm_write 4 0x16c0 DP_CNTL <- 0x3
ati_mm_write 4 0x15d8 DP_SRC_FRGD_CLR <- 0xff000000
ati_mm_write 4 0x15dc DP_SRC_BKGD_CLR <- 0xffececec
ati_mm_write 4 0x1438 DST_Y_X <- 0x18103cb
ati_mm_write 4 0x1434 SRC_Y_X <- 0x0
ati_mm_write 4 0x1598 DST_WIDTH_HEIGHT <- 0x200008
ati_2d_blt: 0x7f71a1200000 0 ds: 0x7f71a1200000 8192 32 rop: cc
ati_2d_blt: 9474048 0 0, 80 256 256, (0,0) -> (971,385) 32x8 > v
ati_2d_blt: pixman_blt(0x7f71a1b09000, 0x7f71a1200000, 640, 2048, 32, 32, 0, 0,
971, 385, 8, 8)
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xce007c
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x38de00ce
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xf638de
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xe600f6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xc600e6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x187c00c6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7c00187c
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7c00
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16e8 DEFAULT_SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16f0 SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x1404 DST_OFFSET <- 0x0
ati_mm_write 4 0x1408 DST_PITCH <- 0x100
ati_mm_write 4 0x16c8 DP_MIX <- 0xf00200
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_write 4 0x16c0 DP_CNTL <- 0x3
ati_mm_write 4 0x147c DP_BRUSH_FRGD_CLR <- 0xffffffff
ati_mm_write 4 0x1438 DST_Y_X <- 0x17e03c7
ati_mm_write 4 0x1598 DST_WIDTH_HEIGHT <- 0x1000f
ati_2d_blt: 0x7f71a1200000 0 ds: 0x7f71a1200000 8192 32 rop: f0
ati_2d_blt: 9474048 0 0, 80 256 256, (0,0) -> (967,382) 1x15 > v
ati_2d_blt: pixman_fill(0x7f71a1200000, 2048, 32, 967, 382, 1, 15, ffffffff)
[...]
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16e8 DEFAULT_SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16f0 SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x1404 DST_OFFSET <- 0x0
ati_mm_write 4 0x1408 DST_PITCH <- 0x100
ati_mm_read 4 0x16c4 DP_DATATYPE -> 0x30d06
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x10006
ati_mm_write 4 0x16c8 DP_MIX <- 0xcc0300
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x10203d2
ati_mm_write 4 0x16e8 DEFAULT_SC_BOTTOM_RIGHT <- 0x10a0429
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x10203d2
ati_mm_write 4 0x16f0 SC_BOTTOM_RIGHT <- 0x10a0429
ati_mm_write 4 0x16c0 DP_CNTL <- 0x3
ati_mm_write 4 0x15d8 DP_SRC_FRGD_CLR <- 0xff000000
ati_mm_write 4 0x15dc DP_SRC_BKGD_CLR <- 0xfff3f3f3
ati_mm_write 4 0x1438 DST_Y_X <- 0x10203d2
ati_mm_write 4 0x1434 SRC_Y_X <- 0x0
ati_mm_write 4 0x1598 DST_WIDTH_HEIGHT <- 0x600008
ati_2d_blt: 0x7f71a1200000 0 ds: 0x7f71a1200000 8192 32 rop: cc
ati_2d_blt: 9474048 0 0, 80 256 256, (0,0) -> (978,258) 96x8 > v
ati_2d_blt: pixman_blt(0x7f71a1b09000, 0x7f71a1200000, 640, 2048, 32, 32, 0, 0,
978, 258, 88, 8)
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7c
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0x0
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x600
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xc6
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0x0
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x600
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7cfc7cc0
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xec00fc7c
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0xc67c7e7c
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xc6c6c67c
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xfe00c6c6
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0xc6c6c6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xfec0c006
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xd600c6fe
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0xfec6c6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xc0c0c6c6
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xc600c6c0
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0xc0c6c6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7cc07c7c
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xc600c67c
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0xc67c7e7c
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x0
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0x0
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x7c000000
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16e8 DEFAULT_SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16f0 SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x1404 DST_OFFSET <- 0x0
ati_mm_write 4 0x1408 DST_PITCH <- 0x100
ati_mm_write 4 0x16c8 DP_MIX <- 0xf00200
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_write 4 0x16c0 DP_CNTL <- 0x3
ati_mm_write 4 0x147c DP_BRUSH_FRGD_CLR <- 0xfff3f3f3
ati_mm_write 4 0x1438 DST_Y_X <- 0x111037d
ati_mm_write 4 0x1598 DST_WIDTH_HEIGHT <- 0xf10050
ati_2d_blt: 0x7f71a1200000 0 ds: 0x7f71a1200000 8192 32 rop: f0
ati_2d_blt: 9474048 0 0, 80 256 256, (0,0) -> (893,273) 241x80 > v
ati_2d_blt: pixman_fill(0x7f71a1200000, 2048, 32, 893, 273, 241, 80, fff3f3f3)
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x1404 DST_OFFSET <- 0x0
ati_mm_write 4 0x1408 DST_PITCH <- 0x100
ati_mm_write 4 0x16c8 DP_MIX <- 0xf00200
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_write 4 0x16c0 DP_CNTL <- 0x3
ati_mm_write 4 0x147c DP_BRUSH_FRGD_CLR <- 0xff1670e0
ati_mm_write 4 0x1438 DST_Y_X <- 0x111037d
ati_mm_write 4 0x1598 DST_WIDTH_HEIGHT <- 0xf10008
ati_2d_blt: 0x7f71a1200000 0 ds: 0x7f71a1200000 8192 32 rop: f0
ati_2d_blt: 9474048 0 0, 80 256 256, (0,0) -> (893,273) 241x8 > v
ati_2d_blt: pixman_fill(0x7f71a1200000, 2048, 32, 893, 273, 241, 8, ff1670e0)
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x1404 DST_OFFSET <- 0x0
ati_mm_write 4 0x1408 DST_PITCH <- 0x100
ati_mm_read 4 0x16c4 DP_DATATYPE -> 0x30d06
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x10006
ati_mm_write 4 0x16c8 DP_MIX <- 0xcc0300
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x111037d
ati_mm_write 4 0x16e8 DEFAULT_SC_BOTTOM_RIGHT <- 0x1190464
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x111037d
ati_mm_write 4 0x16f0 SC_BOTTOM_RIGHT <- 0x1190464
ati_mm_write 4 0x16c0 DP_CNTL <- 0x3
ati_mm_write 4 0x15d8 DP_SRC_FRGD_CLR <- 0xff000000
ati_mm_write 4 0x15dc DP_SRC_BKGD_CLR <- 0xfff3f3f3
ati_mm_write 4 0x1438 DST_Y_X <- 0x111037d
ati_mm_write 4 0x1434 SRC_Y_X <- 0x0
ati_mm_write 4 0x1598 DST_WIDTH_HEIGHT <- 0x1000008
ati_2d_blt: 0x7f71a1200000 0 ds: 0x7f71a1200000 8192 32 rop: cc
ati_2d_blt: 9474048 0 0, 80 256 256, (0,0) -> (893,273) 256x8 > v
ati_2d_blt: pixman_blt(0x7f71a1b09000, 0x7f71a1200000, 640, 2048, 32, 32, 0, 0,
893, 273, 232, 8)
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xfc
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xfc7c7c18
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x0
ati_mm_write 4 0x17cc HOST_DATA3 <- 0x18fcfe18
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0x7c000060
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0x7c1c
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0x7c1c0000
ati_mm_write 4 0x17dc HOST_DATA7 <- 0xc6fc7c
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xc6
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xc6c6c678
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x180000
ati_mm_write 4 0x17cc HOST_DATA3 <- 0xc6c078
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0xc6000060
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0xce3c
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0xc63c0000
ati_mm_write 4 0x17dc HOST_DATA7 <- 0x7cc600ce
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7c7e7cc6
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xc6c60618
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x187cfc
ati_mm_write 4 0x17cc HOST_DATA3 <- 0x38c6fc18
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0xc00000f8
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0xc600de6c
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0xc66c0000
ati_mm_write 4 0x17dc HOST_DATA7 <- 0x6fc00de
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xc6c606fc
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xfc7c7c18
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0xc6c6
ati_mm_write 4 0x17cc HOST_DATA3 <- 0x18fc0618
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0xfc000060
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0x6c00f6cc
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0x7ccc0000
ati_mm_write 4 0x17dc HOST_DATA7 <- 0x7ed800f6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xfec67ed8
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xc0c6c018
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0xc6c0
ati_mm_write 4 0x17cc HOST_DATA3 <- 0x18c60618
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0xc6000060
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0x3800e6fe
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0xc6fe0000
ati_mm_write 4 0x17dc HOST_DATA7 <- 0xc6cc00e6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0xc07ec6cc
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xc0c6c018
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x18c6c0
ati_mm_write 4 0x17cc HOST_DATA3 <- 0x18c6c618
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0xc6000066
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0x6c00c60c
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0xc60c0000
ati_mm_write 4 0x17dc HOST_DATA7 <- 0x7ec600c6
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7c067ec6
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0xc07cfe18
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x187cc0
ati_mm_write 4 0x17cc HOST_DATA3 <- 0x18fc7c18
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0x7c00003c
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0xc6007c0c
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0x7c0c0000
ati_mm_write 4 0x17dc HOST_DATA7 <- 0x7c
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x17c0 HOST_DATA0 <- 0x7c0000
ati_mm_write 4 0x17c4 HOST_DATA1 <- 0x0
ati_mm_write 4 0x17c8 HOST_DATA2 <- 0x0
ati_mm_write 4 0x17cc HOST_DATA3 <- 0x0
ati_mm_write 4 0x17d0 HOST_DATA4 <- 0x0
ati_mm_write 4 0x17d4 HOST_DATA5 <- 0x0
ati_mm_write 4 0x17d8 HOST_DATA6 <- 0x0
ati_mm_write 4 0x17dc HOST_DATA7 <- 0x0
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16e8 DEFAULT_SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16ec SC_TOP_LEFT <- 0x0
ati_mm_write 4 0x16f0 SC_BOTTOM_RIGHT <- 0x1fff1fff
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_read 4 0x1740 GUI_STAT -> 0x40
ati_mm_write 4 0x1404 DST_OFFSET <- 0x0
ati_mm_write 4 0x1408 DST_PITCH <- 0x100
ati_mm_write 4 0x16c8 DP_MIX <- 0xf00200
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x30d06
ati_mm_write 4 0x16c0 DP_CNTL <- 0x3
ati_mm_write 4 0x147c DP_BRUSH_FRGD_CLR <- 0xfff3f3f3
ati_mm_write 4 0x1438 DST_Y_X <- 0x119037d
ati_mm_write 4 0x1598 DST_WIDTH_HEIGHT <- 0xf10008
ati_2d_blt: 0x7f71a1200000 0 ds: 0x7f71a1200000 8192 32 rop: f0
ati_2d_blt: 9474048 0 0, 80 256 256, (0,0) -> (893,281) 241x8 > v
ati_2d_blt: pixman_fill(0x7f71a1200000, 2048, 32, 893, 281, 241, 8, fff3f3f3)
