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Miscellaneous Topics
Double Buffer Extension (DBE)
DBE is an extension to the X server that provides a double-buffering Application Programming
Interface (API).
____________________________________________________________________________________
Note: MBX (the Multi-Buffering eXtension to X) has not been adopted as an industry standard, as DBE
has. Thus, it is recommended that applications that use MBX be ported to DBE usage in preparation for
future MBX obsolescence (HP-UX 11.0). For more information about DBE and the API, consult the
DBE man pages:
DBE
XdbeQueryExtension
XdbeGetVisualInfo
XdbeFreeVisualInfo
XdbeAllocateBackBufferName
XdbeDeallocateBackBufferName
XdbeSwapBuffers
XdbeBeginIdiom
XdbeEndIdiom
XdbeGetBackBufferAttributes
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Performing Buffer Swaps On Vertical Blank
For performance reasons, the default DBE behavior is to not synchronize buffer swaps with the
monitor's vertical retrace period. In some instances, therefore, image tearing (seeing part of the old
image and part of the new image on the display at the same time) could be visible while swapping large
DBE windows. For those instances where tearing would occur and is undesirable, an optional X server
mode is available to allow for synchronization of buffer swaps with vertical retrace. To activate this
optional X server mode, set the following screen option in the X*screens File before the X server is
started:
SwapBuffersOnVBlank
____________________________________________________________________________________
Note: MBX_SWAP_BUFFERS_ON_VBLANK is obsolete with this release. The SwapBuffersOnVBlank
Screen Option works for both DBE and MBX.
____________________________________________________________________________________
Determining Swap Performance
The DBE API does not allow users to determine if double-buffering in a visual is through software or
hardware. However, the API does provide a way to determine relative swapping performance on a per-
visual basis. The XdbeScreenVisualInfo() function returns information about the swapping performance
levels for the double-buffering visuals on a display. A visual with a higher performance level is likely to
have better double-buffer graphics performance than a visual with a lower performance level. Nothing
Graphics Administration Guide for HP-UX 10.20
Page 30
- About this Guide 6
- Preface 8
- Document Conventions 9
- Chapter 1: Pathnames 10
- Starbase 11
- HP-PHIGS 12
- Examples 14
- Device Driver Libraries 17
- X Server Configuration 22
- Syntax Guidelines 23
- Server Options 24
- Screen Entries 24
- Sample X*screens Files 25
- Miscellaneous Topics 30
- Determining Swap Performance 30
- Supported Devices 31
- State DPMS Compliance 32
- Requirements 32
- Performance Tuning of SMT 35
- HP Color Recovery 38
- Dynamic Loading 39
- Include Inferiors Fix 39
- Enable Overlay Transparency 41
- 3-Bit Center Color 41
- Image Text Via BitMap 42
- Special Device Files 42
- Supported X Configurations 43
- Multi-Screen Support 45
- Single Logical Screen (SLS) 45
- Supported Visuals 51
- Supported Screen Options 51
- HP VISUALIZE-EG Modes 59
- Double-Buffer Support 60
- VISUALIZE-8 60
- VISUALIZE-48[XP] 62
- HCRX Colormaps 63
- HP VISUALIZE-FX (FX 67
- Changing the Monitor Type 72
- Disabling the GLX Visuals 72
- Freedom Video Formats 76
- Making an X*.hosts File 79
- Using Special Input Devices 80
- X*devices File 81
- Stopping the X Window System 86
- Customizing Keyboard Input 97
- Printing a Key Map 100
- Using the Keyboards 100
- Default Keyboard Mapping 101
- Equivalent Keys 101
- Changing Key Mapping 101
- C1429 Keyboard 102
- 46021 Keyboard 102
- Comparing the Keyboards 102
- Compatibility Considerations 103
- Re-Installing PowerShade 104
- 3D Graphics Performance 104
- Texture Mapping 105
- HLHSR mode or ID 109
- Colour mapping method 109
- Light sources enabled 109
- Depth cueing state 109
- 3D Thread-Safing 115
- SIGALRM Details 116
- SIGCHLD and the GRM Daemon 117
- Gamma Correction 118
- Gamma Value Slider 123
- Scope of Gamma Correction 123
- Shared Memory Usage 124
- Reference Documentation 125
- Synopsis 126
- Description 126
- Starting Up 127
- Display Names 128
- Access Control 129
- Geometry Specifications 130
- Window Managers 131
- Font Names 131
- Font Server Names 133
- Color Names 133
- Keyboards 135
- Options 136
- Resources 137
- Examples 141
- Diagnostics 141
- See Also 142
- Copyright 142
- Trademarks 142
- Authors 142
- Synopsis 143
- Description 143
- Options 144
- Security File Format 147
- Running From INIT 151
- Granting Access 151
- Signals 152
- Diagnostics 153
- Copyright 154
- See Also 155
- Atom Control 159
- Origin 159
- Installation 160
- Environment 162
- Proxy Manager Config File 164
- Example 165
- Proxy Manager Details 165
- Installation 169
- Resources 170
- Environment 170
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