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glshader

glshader

Properties

gchar * location Read / Write
gchar * preset Read / Write
gchar * vars Write
gchar * fragment Read / Write
GstGLShader * shader Read / Write
GstStructure * uniforms Read / Write
gboolean update-shader Write
gchar * vertex Read / Write

Types and Values

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstBaseTransform
                    ╰── GstGLBaseFilter
                        ╰── GstGLFilter
                            ╰── GstGLFilterShader

Description

OpenGL fragment shader filter

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 );
}

Synopsis

Element Information

plugin

opengl

author

<matthew@centricular.com>

class

Filter/Effect

Element Pads

name

sink

direction

sink

presence

always

details

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

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

name

src

direction

source

presence

always

details

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

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

Functions

Types and Values

struct GstGLFilterShader

struct GstGLFilterShader;

Property Details

The “location” property

  “location”                 gchar *

Location of the GLSL file to load.

Flags: Read / Write

Default value: NULL


The “preset” property

  “preset”                   gchar *

Location of the shader uniform variables preset file.

Flags: Read / Write

Default value: NULL


The “vars” property

  “vars”                     gchar *

Set the shader uniform variables.

Flags: Write

Default value: NULL


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

Signal Details

The “create-shader” signal

GstGLShader*
user_function (GstGLFilterShader *gstglfiltershader,
               gpointer           user_data)

Flags: Run Last

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