[141/906] some steps towards simplification. added a convenience function to gstglfilter and some comment here and there

gst-libs/gst/gl/gstgldisplay.c

@@ -1996,6 +1996,13 @@ gst_gl_display_gen_fbo (GstGLDisplay* display, gint width, gint height,
 
 
 /* Called by glfilter */
+/* this function really has to be simplified...  do we really need to
+   set projection this way? Wouldn't be better a set_projection
+   separate call? or just make glut functions available out of
+   gst-libs and call it if needed on drawcallback? -- Filippo */
+/* GLCB too.. I think that only needed parameters should be
+ * GstGLDisplay *display and gpointer data, or just gpointer data */
+/* ..everything here has to be simplified! */
 gboolean
 gst_gl_display_use_fbo (GstGLDisplay* display, gint texture_fbo_width, gint texture_fbo_height,
                         GLuint fbo, GLuint depth_buffer, GLuint texture_fbo, GLCB cb,

gst-libs/gst/gl/gstglfilter.c

@@ -315,3 +315,19 @@ gst_gl_filter_do_transform (GstGLFilter* filter,
 
     return TRUE;
 }
+
+/* convenience functions to simplify filter development */
+
+void
+gst_gl_filter_render_to_target (GstGLFilter *filter, 
+				GLuint input, GLuint target,
+				GLCB func, gpointer data)
+{
+     gst_gl_display_use_fbo (filter->display, filter->width, filter->height, 
+			     filter->fbo, filter->depthbuffer, target, 
+			     func, 
+			     filter->width, filter->height, input,
+			     0, filter->width, 0, filter->height,
+			     GST_GL_DISPLAY_PROJECTION_ORTHO2D,
+			     data);
+}

gst-libs/gst/gl/gstglfilter.h

@@ -72,6 +72,13 @@ struct _GstGLFilterClass
 
 GType gst_gl_filter_get_type(void);
 
+
+void
+gst_gl_filter_render_to_target (GstGLFilter *filter, 
+				GLuint input, GLuint target,
+				GLCB func, gpointer data);
+
+
 G_END_DECLS
 
 #endif