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Diffstat (limited to 'src/plugins/gfxdrivers/eglnullws/README')
| -rw-r--r-- | src/plugins/gfxdrivers/eglnullws/README | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/src/plugins/gfxdrivers/eglnullws/README b/src/plugins/gfxdrivers/eglnullws/README deleted file mode 100644 index 80b88c7e01..0000000000 --- a/src/plugins/gfxdrivers/eglnullws/README +++ /dev/null @@ -1,48 +0,0 @@ -EGL NullWS QScreen Driver -========================= - -If your application draws everything within a single full-screen QGLWidget then -you may wish to use this QScreen plugin driver. This driver simply returns 0 -(as a EGLNativeWindowType value) when asked by the QtOpenGl module to create a -native window. Some OpenGL ES implementations (including PowerVR) interpret this -to mean that a full-screen OpenGL context is desired without any windowing -support (NullWS). - -To tell a Qt/Embedded application to use this driver use the -display command -line option or the QWS_DISPLAY environment variable. The following driver -options are supported: - -size=WIDTHxHEIGHT Screen size reported by the driver -format=FORMAT Screen format - -Run with '-display eglnullws:help' to get a full list of options (including a -list of supported format strings). - -If you choose a screen format that is not supported by the hardware then the -QtOpenGl module will write out a list of supported EGL configurations. Use -one of the supported screen formats from this list. - -Using this driver with PowerVR hardware ---------------------------------------- - -Using this plugin with PowerVR hardware should give a significant speedup -compared to running with the Qt powervr driver (with a full-screen QGLWidget). -This is because sacrificing the window system allows less work to be done in -order to get graphics on the screen. Using this driver also avoids the memory -fragmentation issues present in the powervr driver and avoids any direct -dependencies on the deprecated PVR2D API from Imagination Technologies. - -To use this driver ensure you have /etc/powervr.ini with contents similar to -this: - -[default] -WindowSystem=libpvrPVR2D_FLIPWSEGL.so - -This driver will also function with libpvrPVR2D_FRONTWSEGL.so, but that draws -straight into the framebuffer and will therefore cause flickering (it can be -useful for performance testing though). The flip plugin uses triple buffering, -so you will need to set the virtual vertical resolution of your framebuffer to -be three times the physical vertical resolution of your screen. This can be -done with 'fbset -vyres'. Failure to do this can cause system crashes. You -should also ensure that the plugin you choose in powervr.ini is in your library -path (it may just silently default to the flip plugin if not). |