We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Is OpenGL® Text?

By Eugene P.
Updated May 16, 2024
Our promise to you
EasyTechJunkie is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At EasyTechJunkie, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

OpenGL® text describes any computer font that, through a number of different methods, appears as an element inside an OpenGL® scene. There is no innate ability for OpenGL® to display text inside a three-dimensional (3D) scene, and there are really no intrinsic ways to overlay system text inside a framebuffer. This has led to the creation of different independent libraries to try to make using OpenGL® text as easy as possible. There are three basic methods of creating OpenGL® text: texture mapping, geometry and bitmap. Each has advantages and disadvantages, with the largest disadvantage for almost all OpenGL® text being a reduction in the rendering speed.

There is no mechanism for displaying text in OpenGL®, mainly because the purpose of the library is to provide hardware-accelerated 3D graphics. The display of fonts or other text is not considered a necessary part of the OpenGL® library of functions. Instead, the developers of software and operating systems have provided independent libraries in an attempt to make it easier to use text inside a 3D environment.

Using bitmap OpenGL® text can be done in a few ways, but it is by far one of the easiest methods to implement. This process begins with a single bitmapped image of the entire font set that is going to be used. When a word needs to be displayed on the screen, the individual letters are copied from the bitmap and arranged on an OpenGL® texture. This texture, which now contains a complete string, is then mapped onto a quadrilateral and placed in front of the scene so it overlays the rest of the 3D objects.

It also is possible to use geometry to actually construct OpenGL® text. This involves using a font that has two-dimensional (2D) vector-based information about how to draw each letter. These vectors are translated into vertices and triangles, making each letter its own model. To display a string of text with geometric fonts, the models just need to be lined up in the correct order in the scene. One advantage to this method is that the text models can be easily extruded to form block-like 3D letters.

The final common method that can be used to show OpenGL® text is to use a simple pre-made texture map. This is an image in which the desired text string is already drawn in the way it should appear within the scene. The image can then be applied to any object, showing the text when the object is rendered. Texture maps are mostly effective for static text, such as words on the side of a 3D cardboard box model. It is one of the simplest ways to show text that has proper spacing and kerning.

EasyTechJunkie is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Discussion Comments

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.