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Hello
I am trying to wrap my head around on how to use the cairo gl backend with opengl. I have hacked around an integration of cairo and Gstreamer Open GL constructs and a cairo surface. Basically it draws to an openGL texture.
GstGLContext *context = GST_GL_BASE_FILTER(overlay)->context;
GstGLDisplay *current_display = gst_gl_context_get_display(context);
void* display_ptr = (void*) gst_gl_display_get_handle(current_display);
if (display_ptr == NULL)
return FALSE;
//
cairo_device_t* device = cairo_glx_device_create(display_ptr,
*((GLXContext*) gst_gl_context_get_gl_context(context)));
overlay->image_width = 1920;
overlay->image_height = 1080;
surface = cairo_gl_surface_create_for_texture(device,
CAIRO_CONTENT_COLOR_ALPHA, texture, 1920, 1080);
cairo_device_destroy(device);
The problem is I am a bit lost about how I can overlay this texture in a normal opengl stream. I have looked into gst_gl_filter_draw_fullscreen_quad and gstgldeinterlace's way of binding to a texture but I am not really sure of the correct way to do.
I think that I always need to do the cairo operations inside the rendering thread, and that is why most filtering functions point to a callback. Correct me if I am wrong but I cannot easily find documentation.
Best regards
Paulo Neves
Best regards
Paulo Neves
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