Why is it that the OpenGL and GLSL geometry shader are displaying only a single point, rather than rendering triangles?

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There could be several reasons for this issue. Here are some possible causes:

1. Incorrect settings: Check the settings for the geometry shader and ensure that they are configured properly to render triangles.

2. Data inconsistency: Verify that the data you are providing to the shader is consistent and correct.

3. Driver issues: Update the graphics card drivers as outdated drivers may cause rendering issues.

4. Lack of input: Ensure that the shader is receiving the correct number and type of inputs, otherwise it may not be able to perform its functions correctly.

5. Compatibility issues: Make sure that the version of OpenGL and GLSL you are using is compatible with your graphics card and operating system.