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Showing content from https://gstreamer.freedesktop.org/documentation/opengl/glshader.html below:

glshader

OpenGL fragment shader filter

 gst-launch-1.0 videotestsrc ! glupload ! glshader fragment="\"`cat myshader.frag`\"" ! glimagesink

FBO (Frame Buffer Object) and GLSL (OpenGL Shading Language) are required. Depending on the exact OpenGL version chosen and the exact requirements of the OpenGL implementation, a #version header may be required.

The following is a simple OpenGL ES (also usable with OpenGL 3 core contexts) passthrough shader with the required inputs.

 #version 100
 #ifdef GL_ES
 precision mediump float;
 #endif
 varying vec2 v_texcoord;
 uniform sampler2D tex;
 uniform float time;
 uniform float width;
 uniform float height;

 void main () {
   gl_FragColor = texture2D( tex, v_texcoord );
 }

Authors: –

Classification: – Filter/Effect

Rank – none

Plugin – opengl

Package – GStreamer Base Plug-ins

video/x-raw(ANY):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

video/x-raw(memory:GLMemory):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

Presence – always

Direction – sink

Object type – GstPad

video/x-raw(memory:GLMemory):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

video/x-raw(ANY):
         format: RGBA
          width: [ 1, 2147483647 ]
         height: [ 1, 2147483647 ]
      framerate: [ 0/1, 2147483647/1 ]
 texture-target: 2D

Presence – always

Direction – src

Object type – GstPad

GstGLShader *
create_shader_callback (GstElement * param_0,
                        gpointer udata)

def create_shader_callback (param_0, udata):
    #python callback for the 'create-shader' signal

function create_shader_callback(param_0: GstElement * param_0, udata: gpointer udata): {
    // javascript callback for the 'create-shader' signal
}

Parameters:

param_0 –

udata –

Flags: Run Last

“fragment” gchararray

GLSL fragment source

Flags : Read / Write

Default value : NULL

“shader” GstGLShader *

GstGLShader to use

Flags : Read / Write

“uniforms” GstStructure *

GLSL Uniforms

Flags : Read / Write

“update-shader” gboolean

Emit the 'create-shader' signal for the next frame

Flags : Read / Write

Default value : false

“vertex” gchararray

GLSL vertex source

Flags : Read / Write

Default value : NULL

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