[Bug 765517] New: glcolorconvert: fix Fragment shader compile error in GLES3.0 or higher

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765517

            Bug ID: 765517
           Summary: glcolorconvert: fix Fragment shader compile error in
                    GLES3.0 or higher
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jared.hu at nxp.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

1. glcolorconvert fragment shader compile error when using OpenGL ES 3.0 or
higher.

When compile shader (for example RGB->PlanerYUV) on OpenGL ES 3.0 or higher，I
meet an error like bellow:

(39:0) : error : function: 'texture2D' does not have a corresponding
declaration
(55:0) : error : reserved keyword : 'sample'
(55:0) : error : syntax error at 'sample'

In OpenGL ES Shading Language version 3.0 or higher, function "texture2D" is
changed to "texture" and 'sample' has become a reserved keyword for future use
which will also result in compile error.

2. By the way, when build glcolorconvert for OpenGL ES, I meet another build
error.
Form function “gst_gl_shader_bind_frag_data_location”, gl->BindFragDataLocation
is not an OpenGL ES API but Desktop GL API. We need add compile macro here.

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