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Field Name
D2OVL_ALPHA_MODE
D2OVL_ALPHA_PREMULT
D2OVL_ALPHA_INV
Secondary display graphics/overlay alpha blending control
Field Name
D2GRPH_KEY_RED_LOW
D2GRPH_KEY_RED_HIGH
Secondary graphics keyer red component range
Field Name
D2GRPH_KEY_GREEN_LOW
D2GRPH_KEY_GREEN_HIGH
Secondary graphics keyer green component range
© 2007 Advanced Micro Devices, Inc.
Proprietary
D2OVL_ALPHA_CONTROL - RW - 32 bits - DISPDEC:0x6B0C
Bits
1:0
8
16
D2GRPH_KEY_RANGE_RED - RW - 32 bits - DISPDEC:0x6B10
Bits
15:0
31:16
D2GRPH_KEY_RANGE_GREEN - RW - 32 bits - DISPDEC:0x6B14
Bits
15:0
31:16
Default
0x0
Graphics/overlay alpha blending mode for secondary controller.
In any case, if there is only graphics, the input OVL_DATA is forced to
blank. If there is only overlay, the input GRPH_DATA is forced to
blank.
0=Keyer mode, select graphic or overlay keyer to mix graphics and
overlay
1=Per pixel graphic alpha mode.Alpha blend graphic and overlay
layer. The alpha from graphic pixel may be inverted according to reg-
ister field
2=Global alpha mode
3=Per pixel overlay alpha mode
0x0
For use with per pixel alpha blend mode. Selects whether pre-multi-
plied alpha or non-multiplied alpha.
0=0x0 - When DxOVL_ALPHA_MODE = 0x1, then Pixel =
PIX_ALPHA * graphics pixel + (1-PIX_ALPHA) * overlay pixel.When
DxOVL_ALPHA_MODE = 0x3, then Pixel = PIX_ALPHA * overlay
pixel + (1-PIX_ALPHA) * graphic pixel
1=0x1 - When DxOVL_ALPHA_MODE = 0x1, then Pixel = graphic
pixel + (1-PIX_ALPHA) * overlay pixel.When DxOVL_ALPHA_MODE
= 0x3, then Pixel = overlay pixel + (1-PIX_ALPHA) * graphic pixel
0x0
For use with pixel blend mode. Apply optional inversion to the alpha
value extracted form the graphics or overlay surface data.
0=PIX_ALPHA = alpha from graphics or overlay
1=PIX_ALPHA = 1 - alpha from graphics or overlay
Default
0x0
Secondary graphics keyer red component lower limit.
Note: If the graphic component is less than 16 bit, msbs are all zeros.
0x0
Secondary graphics keyer red component upper limit.
Note: If the graphic component is less than 16 bit, msbs are all zeros.
Default
0x0
Secondary graphics keyer green component lower limit.
Note: If the graphic component is less than 16 bit, msbs are all zeros.
0x0
Secondary graphics keyer green component upper limit.
Note: If the graphic component is less than 16 bit, msbs are all zeros.
Display Controller Registers
Description
Description
Description
M56 Register Reference Manual
2-247
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