HP SVA V2.1 Parallel Compositing Reference Guide

Table 2-7 Summary of Context Properties (continued)
DescriptionCan
Change
After
Context
Create
Can Set
On
Context
Create
TypePropertyValue
1
This property returns the number of bytes written
by the local host to all other hosts since the last
retrieval of this property. Retrieving the property
resets the property to 0. Although the property
is local and applies to a host, the property can
only be retrieved for the local host.
nonointeger
PC_WRITE_COUNT_EXT
(Supported by
more than one
vendor.)
1 Global properties have a single value that is the same for all hosts in the context. Host-specific properties can have
a different value for each host.
Table 2-8 Observations on Properties
ObservationCan Change After Context
Create
Can Set On Context CreateExample
Can be set initially and
dynamically.
YesYes
PC_FRAME_WIDTH
Read-only.NoNo
PC_HOSTINDEX
Must be set after context
create.
YesNo
PC_OUTPUT_X_OFFSET
Must be set on context
create.
NoYes
PC_PIXEL_FORMAT
The PC_PIXEL_FORMAT property describes the pixels in the frame. This property is logically
two values:
• A color value that can be extracted using the PC_PF_COLOR_MASK mask.
• An additional data value than can be extracted using the PC_PF_DEPTHMASK mask.
Predefined constants are defined for each of these logical values that can be “OR’d” together to
construct a value for the PC_PIXEL_FORMAT property.
Table 2-9 Pixel Format Table
DescriptionColor versus DepthFormat
4 byte pixel consisting of color in
(blue/green/red) BGR order plus 8 bit
alpha value.
color
PC_PF_BGRA8
4 byte pixel consisting of color in RGB
order plus 8 bit alpha value.
color
PC_PF_RGBA8
3 byte pixel consisting of color in BGR
order. There is no fourth byte.
color
PC_PF_BGR8
Additional 4 bytes of depth data as 32
bit integer.
depth
PC_PF_Z32I
Additional 4 bytes of depth data as 32
bit integer.
depth
PC_PF_Z32F
Additional 3 bytes of depth data as 24
bit integer.
depth
PC_PF_Z24I
Additional 1 byte of depth data as 8
bit integer.
depth
PC_PF_Z8I
The PC_COMPOSITE_TYPE property describes how the pixels from multiple hosts are composited.
32 Overview of Functions and Properties