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Asked: 2026-05-12T01:16:14+00:00

I’m learning about how to use JOGL and OpenGL to render texture-mapped quads. I

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I’m learning about how to use JOGL and OpenGL to render texture-mapped quads. I have a test program and a test quad, and I figured out how to enable GL_BLEND so that I can specify the alpha value of a vertex to make a quad with a sort of gradient… but now I want this to show through to another textured quad at the same position.

Drawing two quads with the same vertex locations didn’t work, it only renders the first quad. Is this possible then, or will I need to basically construct a custom texture on-the-fly based on what I want and then draw one quad with this texture? I was really hoping to take advantage of blending in this case…

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  1. Editorial Team

    Have a look at which glDepthFunc you’re using, perhaps you’re using GL_LESS/GL_GREATER and it could work if you’re using GL_LEQUAL/GL_GEQUAL.

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