In order for it to work, though, you must pre-assign the values of your vertex attribute array indices before compiling and linking, using glBindAttribLocation , making sure each of your programs uses separate indices. If you don't, then the same VBO may go to both programs. The VBOs being used by both programs must all be in the same VAO, which must be bound while the programs are active and the Draw commands are executed. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Use different shader programs in OpenGL? Ask Question. Asked 5 years, 3 months ago. Active 3 years, 1 month ago. Viewed 10k times. I have to use two different shader programs in OpenGL for different objects.
Improve this question. I'll try to put this delicately Modern OpenGL builds on a foundation of running shader programs, and most techniques are built on top of that foundation. DietrichEpp Well with pretty familiar I meant I did several Projects in University, of which some were pretty complex. But the thing is we always had to code base or it was not modern openGL. So I am facing this specific part the first time, and this is how I asked this question. Add a comment.
Active Oldest Votes. Bind the vertex array with glBindVertexArray. Bind any textures you need with glActiveTexture and glBindTexture. Draw with glDrawArrays or glDrawElements. If you want, reset state back to defaults.
In the old days, using OpenGL meant developing in immediate mode often referred to as the fixed function pipeline which was an easy-to-use method for drawing graphics. Most of the functionality of OpenGL was hidden inside the library and developers did not have much control over how OpenGL does its calculations. Developers eventually got hungry for more flexibility and over time the specifications became more flexible as a result; developers gained more control over their graphics.
The immediate mode is really easy to use and understand, but it is also extremely inefficient. For that reason the specification started to deprecate immediate mode functionality from version 3. The advantage of learning the modern approach is that it is very flexible and efficient. However, it's also more difficult to learn. The immediate mode abstracted quite a lot from the actual operations OpenGL performed and while it was easy to learn, it was hard to grasp how OpenGL actually operates.
The modern approach requires the developer to truly understand OpenGL and graphics programming and while it is a bit difficult, it allows for much more flexibility, more efficiency and most importantly: a much better understanding of graphics programming. This is also the reason why this book is geared at core-profile OpenGL version 3.
Although it is more difficult, it is greatly worth the effort. As of today, higher versions of OpenGL are available to choose from at the time of writing 4. The answer to that question is relatively simple. All future versions of OpenGL starting from 3.
The result is that all concepts and techniques remain the same over the modern OpenGL versions so it is perfectly valid to learn OpenGL 3. A great feature of OpenGL is its support of extensions. Whenever a graphics company comes up with a new technique or a new large optimization for rendering this is often found in an extension implemented in the drivers. If the hardware an application runs on supports such an extension the developer can use the functionality provided by the extension for more advanced or efficient graphics.
This way, a graphics developer can still use these new rendering techniques without having to wait for OpenGL to include the functionality in its future versions, simply by checking if the extension is supported by the graphics card. Often, when an extension is popular or very useful it eventually becomes part of future OpenGL versions.
The developer has to query whether any of these extensions are available before using them or use an OpenGL extension library.
GPU vendors may also provide some additional functionality in the form of extension. Associated Libraries : The earliest version is released with a companion library called OpenGL utility library. But since OpenGL is quite a complex process. So in order to make it easier other library such as OpenGL Utility Toolkit is added which is later superseded by free glut. It can do pure software rendering and it may also use hardware acceleration on BSD, Linux, and other platforms by taking advantage of Direct Rendering Infrastructure.
Install OpenGL on Ubuntu For installing OpenGL on Ubuntu, just execute the following command like installing any other thing in terminal : sudo apt-get install freeglut3-dev For working on Ubuntu operating system: gcc filename. Install OpenGL on windows in Code::Blocks Download code block and install it Go to the link and download zip file from the download link that appears after freeglut MinGW package with having link name as Download freeglut 3.
Now open Code::Blocks. Give project title anything and then choose Next. Skip to content.
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