GstGLUtils

GstGL.prototype.gl_element_propagate_display_context

function GstGL.prototype.gl_element_propagate_display_context(element: Gst.Element, display: GstGL.GLDisplay): {
    // javascript wrapper for 'gst_gl_element_propagate_display_context'
}

GstGL.prototype.gl_ensure_element_data

function GstGL.prototype.gl_ensure_element_data(element: Gst.Element, display_ptr: GstGL.GLDisplay, other_context_ptr: GstGL.GLContext): {
    // javascript wrapper for 'gst_gl_ensure_element_data'
}

Perform the steps necessary for retrieving a GstGL.GLDisplay and (optionally) an application provided GstGL.GLContext from the surrounding elements or from the application using the Gst.Context mechanism.

If the contents of display_ptr or other_context_ptr are not null, then no Gst.Context query is necessary for GstGL.GLDisplay or GstGL.GLContext retrieval or is performed.

This performs Gst.Context queries (if necessary) for a winsys display connection with GstGL.GL_DISPLAY_CONTEXT_TYPE, "gst.x11.display.handle", and "GstWaylandDisplayHandleContextType" stopping after the first successful retrieval.

This also performs a Gst.Context query (if necessary) for an optional application provided GstGL.GLContext using the name "gst.gl.app_context". The returned GstGL.GLContext will be shared with a GStreamer created OpenGL context.

GstGL.prototype.gl_get_affine_transformation_meta_as_ndc

function GstGL.prototype.gl_get_affine_transformation_meta_as_ndc(meta: GstVideo.VideoAffineTransformationMeta): {
    // javascript wrapper for 'gst_gl_get_affine_transformation_meta_as_ndc'
}

Retrieves the stored 4x4 affine transformation matrix stored in meta in NDC coordinates. if meta is NULL, an identity matrix is returned.

NDC is a left-handed coordinate system

• x - [-1, 1] - +ve X moves right
• y - [-1, 1] - +ve Y moves up
• z - [-1, 1] - +ve Z moves into

Since : 1.20

GstGL.prototype.gl_get_plane_data_size

function GstGL.prototype.gl_get_plane_data_size(info: GstVideo.VideoInfo, align: GstVideo.VideoAlignment, plane: Number): {
    // javascript wrapper for 'gst_gl_get_plane_data_size'
}

Retrieve the size in bytes of a video plane of data with a certain alignment

GstGL.prototype.gl_get_plane_start

function GstGL.prototype.gl_get_plane_start(info: GstVideo.VideoInfo, valign: GstVideo.VideoAlignment, plane: Number): {
    // javascript wrapper for 'gst_gl_get_plane_start'
}

GstGL.prototype.gl_handle_context_query

function GstGL.prototype.gl_handle_context_query(element: Gst.Element, query: Gst.Query, display: GstGL.GLDisplay, context: GstGL.GLContext, other_context: GstGL.GLContext): {
    // javascript wrapper for 'gst_gl_handle_context_query'
}

GstGL.prototype.gl_handle_set_context

function GstGL.prototype.gl_handle_set_context(element: Gst.Element, context: Gst.Context): {
    // javascript wrapper for 'gst_gl_handle_set_context'
}

Helper function for implementing vfunc_set_context() in OpenGL capable elements.

Retrieve's the GstGL.GLDisplay or GstGL.GLContext in context and places the result in display or other_context respectively.

GstGL.prototype.gl_multiply_matrix4

function GstGL.prototype.gl_multiply_matrix4(a: [ Number ], b: [ Number ]): {
    // javascript wrapper for 'gst_gl_multiply_matrix4'
}

Multiplies two 4x4 matrices, a and b, and stores the result, a 2-dimensional array of Number, in result.

Since : 1.20

GstGL.prototype.gl_set_affine_transformation_meta_from_ndc

function GstGL.prototype.gl_set_affine_transformation_meta_from_ndc(meta: GstVideo.VideoAffineTransformationMeta, matrix: [ Number ]): {
    // javascript wrapper for 'gst_gl_set_affine_transformation_meta_from_ndc'
}

Set the 4x4 affine transformation matrix stored in meta from the NDC coordinates in matrix.

Since : 1.20

GstGL.prototype.gl_value_get_texture_target_mask

function GstGL.prototype.gl_value_get_texture_target_mask(value: GObject.Value): {
    // javascript wrapper for 'gst_gl_value_get_texture_target_mask'
}

See GstGL.prototype.gl_value_set_texture_target_from_mask for what entails a mask

GstGL.prototype.gl_value_set_texture_target

function GstGL.prototype.gl_value_set_texture_target(value: GObject.Value, target: GstGL.GLTextureTarget): {
    // javascript wrapper for 'gst_gl_value_set_texture_target'
}

GstGL.prototype.gl_value_set_texture_target_from_mask

function GstGL.prototype.gl_value_set_texture_target_from_mask(value: GObject.Value, target_mask: GstGL.GLTextureTarget): {
    // javascript wrapper for 'gst_gl_value_set_texture_target_from_mask'
}

A mask is a bitwise OR of (1 << target) where target is a valid GstGL.GLTextureTarget