GL_EXT_geometry_shader4 glsl -- not working?
I am writing a program using the opengl 2.1 api, and wanted to use the extension GL_EXT_geometry_shader4 to write a dummy geometry shader in glsl, which only copies the vertices from the input -- but the screen remains black, althought no errors occure during shader compilation, and both vertex and fragment shader work fine, if I don't use the geometry shader :(
dummy vertex shader:
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