disp-gles2-gears

Graphics and Screen4.0 (8.x)Screen Graphics Subsystem Developer's GuideAPIProgrammingUtilities

Demonstrate virtual display APIs using OpenGL ES 2.x

Syntax:

disp-gles2-gears [-bg-alpha=background_alpha_value]
                 [-brightness=brightness]
                 [-config=egl_configuration]
                 [-contrast=contrast]
                 [-fg-alpha=foreground_alpha_value]
                 [-frame-limit=frame_limit]
                 [-hue=hue]
                 [-interval=swap_interval]
                 [-nbuffers=count]
                 [-pipeline=pipeline_id]
                 [-pos=x,y]
                 [-saturation=saturation]
                 [-size=widthxheight]
                 [-transparency=transparency_mode]
                 [-verbose]
                 [-zorder=zorder]
            

Runs on:

QNX OS

Options:

-bg-alpha=background_alpha_value

Set the background to the specified alpha value as a float in the range [0.0f..1.0f]. If you don't specify the bg-alpha option, then disp-gles2-gears uses 0.0f.

-brightness=brightness
Set brightness of the window as an integer in the range [-255..255]. If you don't specify this option, disp-gles2-gears uses 0 (zero) as a default.
-config=egl_configuration

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.

Sampling

Specify multi-sampling as:

[rate]x

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 EGL configurations that are supported on your target.

-contrast=contrast
Set contrast of the window in the range [-128..127]. If you don't specify this option, disp-gles2-gears uses 0 (zero) as a default.
-fg-alpha=foreground_alpha_value

Set the foreground to the specified alpha value as a float in the range [0.0f..1.0f]. If you don't specify the fg-alpha option, then this utility uses 1.0f.

-frame-limit=frame_limit
Limit the number of frames rendered to the value specified by frame_limit (integer); after the frame limit is reached, disp-gles2-gears exits. By default, this utility assumes an unlimited number of frames.
-hue=hue
Set hue of the window in the range [-128..127]. If you don't specify this option, disp-gles2-gears uses 0 (zero) as a default.
-interval=swap_interval
Set the swap interval (default is 1). The swap interval is the minimum number of vsync periods between image updates.
-nbuffers=count
Set the number of window buffers to be created for rendering. The default is 2.
-pipeline=pipeline_id
Set the pipeline as specified by pipeline_id (integer). If you don't specify this option, disp-gles2-gears uses the pipeline of the framebuffer.

If you use this option, Screen applies the SCREEN_USAGE_OVERLAY usage flag and uses the pipeline specified by pipeline_id.

-pos=x,y
Sets the x,y coordinates of the viewport. The default coordinate of 0,0 is used if this option isn't specified.
-saturation=saturation
Set saturation of the window in the range [-128..127]. If you don't specify this option, disp-gles2-gears uses 0 (zero) as a default.
-size=widthxheight
Set the size as specified, using integer values for width and height, of the viewport. The default size is fullscreen.
-transparency=transparency_mode
Set the transparency mode of the window. Valid transparency modes are:
Transparency mode Description
none Default mode; result is an opaque window
test Destination pixels are replaced by source pixels; pixels may be opaque or fully transparent
src Destination pixels are replaced by source pixels, including the alpha channel; window will be blended with contents underneath it
-verbose
Print information to display.
-zorder=zorder
Set the z-order specified by zorder, as an integer, of the window. A z-order of 0 is used if this option isn't specified.

Description:

The disp-gles2-gears binary is a command-line tool that can be used to confirm that screen is running, and that all necessary drivers for OpenGL ES 2.x are in place, and can start successfully.

To run disp-gles2-gears:

  1. Ensure that screen is running.
  2. Run disp-gles2-gears from a shell.

Examples:

# disp-gles2-gears
            


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