Examples

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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.

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#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 );
}

struct GstGLFilterShader

struct GstGLFilterShader;

The “fragment” property

  “fragment”                 gchar *

GLSL fragment source.

Flags: Read / Write

Default value: NULL

The “shader” property

  “shader”                   GstGLShader *

GstGLShader to use.

Flags: Read / Write

The “uniforms” property

  “uniforms”                 GstStructure *

GLSL Uniforms.

Flags: Read / Write

The “update-shader” property

  “update-shader”            gboolean

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

Flags: Write

Default value: FALSE

The “vertex” property

  “vertex”                   gchar *

GLSL vertex source.

Flags: Read / Write

Default value: NULL

The “create-shader” signal

GstGLShader*
user_function (GstGLFilterShader *gstglfiltershader,
               gpointer           user_data)

Flags: Run Last