Display hardware-rendered content using OpenGL ES 1.x


gles-vsync   [-config=egl_configuration]

Runs on:

QNX Neutrino



Set optional EGL configuration specifiers. These optional configuration specifiers are set using a comma-separated list. The specifiers may include the following: pixel format and/or multi-sampling specifications, or an EGL configuration number. If you're using an EGL configuration number, it must not be specified with other specifiers.

Pixel format

Specify pixel format as one of the following:

  • rgba8888 or rgbx8888
  • rgba5551 or rgbx5551
  • rgb565
  • rgba4444 or rgbx4444

where "a" indicates alpha bits and "x" indicates ignored bits.


Specify multi-sampling as:


where rate is a valid sampling rate (e.g., 2, 4, 8, ...).

EGL configuration number
Specify as an integer. The integer must be a valid EGL configuration ID (EGL_CONFIG_ID).

For example, the following are all valid ways of specifying the EGL configuation option:

  • -config=rgb565
  • -config=rgba8888,4x
  • -config=12

If no specific EGL configuration is provided, this utility uses the platform-specific EGL configuration. Use egl-configs to determine the the EGL configurations that are supported on your target.

Use two rendering buffers, while alternating between the two. This is the default.
Set the swap interval, as an integer (default is 1). The swap interval is the minimum number of vsync periods between image updates.
Set the position, using integer x and y coordinates, of the viewport (default is 0, 0).
Set the size, using integer values for width and height, of the viewport (default is fullscreen).
Use one rendering buffer.
Print information to display.


The gles1-vsync binary is a command-line tool that can be used to confirm that screen is running and all necessary drivers for OpenGL ES 1.x are in place, and can start successfully.

To run gles1-vsync:

  1. Ensure that screen is running.
  2. Run gles1-vsync from a shell.


# gles1-vsync